{"type":"doc","content":[{"type":"heading","attrs":{"level":1},"marks":[{"type":"alignment","attrs":{"align":"center"}}],"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_82h6p1c2zt5d"}},"macroMetadata":{"macroId":{"value":"56dd21c4-c76c-4fb9-991d-a37a451a8159"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"d9a28aa8-e8e6-44f1-b4b9-8b87aa212df8"}},{"text":"Gdb Crash Dump Guide","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":1},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_hu4xv4bc83aa"}},"macroMetadata":{"macroId":{"value":"c61977d1-db56-40ec-ade6-6f25421f4593"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"d290d064-d258-484b-a0de-1a3d7f9fe312"}},{"text":"Analysing Crash Dumps","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":2},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_mw2vxxf7vimc"}},"macroMetadata":{"macroId":{"value":"0f6fdde9-af03-4d8a-8bcf-dcaddd82a964"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"18dfa7e4-4720-46c9-98d1-a14247196d64"}},{"text":"Initiating GDB","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Command:","type":"text"}]},{"type":"paragraph","content":[{"text":"Prompt $ ","type":"text"},{"text":"sudo gdb ","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"E.g.","type":"text"}]},{"type":"paragraph","content":[{"text":"prompt$ ","type":"text"},{"text":"sudo gdb ./ipperte core","type":"text","marks":[{"type":"strong"}]},{"text":" ","type":"text"}]},{"type":"paragraph","content":[{"text":"GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7","type":"text"},{"type":"hardBreak"},{"text":"Copyright (C) 2014 Free Software Foundation, Inc.","type":"text"},{"type":"hardBreak"},{"text":"License GPLv3+: GNU GPL version 3 or later ","type":"text"},{"type":"hardBreak"},{"text":"This is free software: you are free to change and redistribute it.","type":"text"},{"type":"hardBreak"},{"text":"There is NO WARRANTY, to the extent permitted by law. Type \"show copying\"","type":"text"},{"type":"hardBreak"},{"text":"and \"show warranty\" for details.","type":"text"},{"type":"hardBreak"},{"text":"This GDB was configured as \"x86_64-linux-gnu\".","type":"text"},{"type":"hardBreak"},{"text":"Type \"show configuration\" for configuration details.","type":"text"},{"type":"hardBreak"},{"text":"For bug reporting instructions, please see:","type":"text"},{"type":"hardBreak"},{"text":".","type":"text"},{"type":"hardBreak"},{"text":"Find the GDB manual and other documentation resources online at:","type":"text"},{"type":"hardBreak"},{"text":".","type":"text"},{"type":"hardBreak"},{"text":"For help, type \"help\".","type":"text"},{"type":"hardBreak"},{"text":"Type \"apropos word\" to search for commands related to \"word\"...","type":"text"},{"type":"hardBreak"},{"text":"Reading symbols from ./ipperte...done.","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10122]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10062]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10063]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10064]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10065]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10066]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10067]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10068]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10125]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10059]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10061]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10071]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10072]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10120]","type":"text"},{"type":"hardBreak"},{"text":"[New LWP 10070]","type":"text"},{"type":"hardBreak"},{"type":"hardBreak"},{"text":"warning: Could not load shared library symbols for /tmp/xf-33417f81c8f3d65ff8f8a781917b9932.tmp.","type":"text"},{"type":"hardBreak"},{"text":"Do you need \"set solib-search-path\" or \"set sysroot\"?","type":"text"},{"type":"hardBreak"},{"text":"[Thread debugging using libthread_db enabled]","type":"text"},{"type":"hardBreak"},{"text":"Using host libthread_db library \"/lib/x86_64-linux-gnu/libthread_db.so.1\".","type":"text"},{"type":"hardBreak"},{"text":"Core was generated by `./ipperte'.","type":"text"},{"type":"hardBreak"},{"text":"Program terminated with signal SIGSEGV, Segmentation fault.","type":"text"},{"type":"hardBreak"},{"text":"#0 0x00007fd5ffb4e8f3 in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Here we can see we died with a ","type":"text"},{"text":"SIGSEGV, Segmentation fault ","type":"text","marks":[{"type":"strong"}]},{"text":" in ","type":"text"},{"text":"/lib/x86_64-linux-gnu/libc.so.6","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":3},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_u8i4bilunxwl"}},"macroMetadata":{"macroId":{"value":"9c3ed70d-66e4-4b38-9fbd-1af0b34fbab3"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"e89d1fa7-cad1-4b63-8758-a5c38f96bc28"}},{"text":"Visual Mode","type":"text"}]},{"type":"paragraph","content":[{"text":"Or use the additional switch","type":"text"},{"text":" -tui","type":"text","marks":[{"type":"strong"}]},{"text":" to enter visual mode e.g.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"sudo gdb -tui ./ipperte core ","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"This produces a split screen text mode interface where the top part is source code and the lower half is a command window accepting standard gdb commands","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Using ","type":"text"},{"text":"select ","type":"text","marks":[{"type":"strong"}]},{"text":" will switch to stack frame N and handily show the source associated with that frame.","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":2},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_v4jydm84gkyu"}},"macroMetadata":{"macroId":{"value":"940238fe-ceea-4182-8131-aed875739d97"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"040fc8b4-923b-435e-b17e-0393e2827dde"}},{"text":"If it’s a Segfault - what’s the referenced address:","type":"text"}]},{"type":"paragraph","content":[{"text":"The _siginfo structure provides this","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"(gdb) print $_siginfo._sifields._sigfault.si_addr","type":"text","marks":[{"type":"textColor","attrs":{"color":"#303336"}}]}]},{"type":"heading","attrs":{"level":2},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_163uvq1uclyn"}},"macroMetadata":{"macroId":{"value":"de9499be-d545-4cb7-b393-7ebbdcc0f5a4"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"d4ae8ca2-0d25-4081-b954-b830860ddd9e"}},{"text":"Looking at the stack (backtrace)","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Command:","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb)","type":"text"},{"text":" bt","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"Or","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"backtrace","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"E.g.","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"(gdb)","type":"text"},{"text":" bt","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"#0 0x00007fd5ffb4e8f3 in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"#1 0x00007fd5ffc0d39d in __vfprintf_chk () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"#2 0x000000000042d74f in vprintf (__ap=0x7fd344a27cf8, __fmt=0x52534d \"VI: %s registering [%s] [%d]\\n\")","type":"text"}]},{"type":"paragraph","content":[{"text":" at /usr/include/x86_64-linux-gnu/bits/stdio2.h:117","type":"text"}]},{"type":"paragraph","content":[{"text":"#3 ippe_debug_print (debug=debug@entry=0, fmt=fmt@entry=0x52534d \"VI: %s registering [%s] [%d]\\n\")","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:339","type":"text"}]},{"type":"paragraph","content":[{"text":"#4 0x0000000000428edd in ippe_register_port (","type":"text"}]},{"type":"paragraph","content":[{"text":" port_name=0x7fd34d368120 , input=input@entry=0,","type":"text"}]},{"type":"paragraph","content":[{"text":" output=output@entry=1) at /home/itrinegy/Development/ine-dpdk/dpdk.c:3311","type":"text"}]},{"type":"paragraph","content":[{"text":"#5 0x00007fd5fdbfadd3 in __class_Symmetric_Routing_UserInput (inputParameter=0x7fd344a28140,","type":"text"}]},{"type":"paragraph","content":[{"text":" __this_ptr=0x7fd598db2da0, __td=) at /tmp/Default.c:13627","type":"text"}]},{"type":"paragraph","content":[{"text":"#6 __class_Symmetric_Routing__ippe_input (__td=, __this_ptr=0x7fd598db2da0, argc=,","type":"text"}]},{"type":"paragraph","content":[{"text":" argv=) at /tmp/Default.c:13266","type":"text"}]},{"type":"paragraph","content":[{"text":"#7 0x00000000004309bb in ippe_process_proc (module_id=module_id@entry=0,","type":"text"}]},{"type":"paragraph","content":[{"text":" proc=proc@entry=0x7fd31c000aed \"Symmetric_Routing\", index=60, id=, args=0x7fd31d3c1fd0,","type":"text"}]},{"type":"paragraph","content":[{"text":" args_len=4, __td=__td@entry=0x7fd344a28500, username=username@entry=0x7fd325398ec0 \"admin\")","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:7789","type":"text"}]},{"type":"paragraph","content":[{"text":"#8 0x0000000000448b7e in update_kernel (args=args@entry=0x7fd31d3b8060, num_args=,","type":"text"}]},{"type":"paragraph","content":[{"text":" cl_ret=cl_ret@entry=0x7fd31c9c4920 \"\", UNUSED_fd=UNUSED_fd@entry=43, close_fd=close_fd@entry=0x7fd344a29dd0)","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:6278","type":"text"}]},{"type":"paragraph","content":[{"text":"#9 0x000000000044a005 in interpret_commands (fd=fd@entry=43, buf=buf@entry=0x7fd31c0008c0 \"--sessionId\",","type":"text"}]},{"type":"paragraph","content":[{"text":" close_fd=close_fd@entry=0x7fd344a29dd0) at /home/itrinegy/Development/ine-dpdk/ipperte.c:1972","type":"text"}]},{"type":"paragraph","content":[{"text":"#10 0x000000000044a187 in read_data (data=) at /home/itrinegy/Development/ine-dpdk/ipperte.c:1921","type":"text"}]},{"type":"paragraph","content":[{"text":"#11 0x00007fd5ffed1182 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0","type":"text"}]},{"type":"paragraph","content":[{"text":"#12 0x00007fd5ffbfdfbd in clone () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb)","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"This helps us to see who the caller was and coming up the stack we can see that the first routine we’re responsible for is in stack frame 3:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"#3 ippe_debug_print (debug=debug@entry=0, fmt=fmt@entry=0x52534d \"VI: %s registering [%s] [%d]\\n\")","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:339","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Where we see that ippe_debug_print caused the crash and the offending line was ","type":"text"},{"text":"339 ","type":"text","marks":[{"type":"strong"}]},{"text":"of ","type":"text"},{"text":"/home/itrinegy/Development/ine-dpdk/ipperte.c","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Of course if we’re looking at pepl code then we have to continue to frame 5:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"#5 0x00007fd5fdbfadd3 in __class_Symmetric_Routing_UserInput (inputParameter=0x7fd344a28140,","type":"text"}]},{"type":"paragraph","content":[{"text":" __this_ptr=0x7fd598db2da0, __td=) at /tmp/Default.c:13627","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":" Where we see that ippe_debug_print caused the crash and the offending line was 13627 of ","type":"text"},{"text":"/tmp/Default.c - ","type":"text","marks":[{"type":"strong"}]},{"text":"which is the temporary file created by ","type":"text"},{"text":"./peplc default_Enterprise.pepl","type":"text","marks":[{"type":"strong"}]},{"text":" - the Default comes from the module name at the top of this pepl source file","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":3},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_9cv1tfxc0yja"}},"macroMetadata":{"macroId":{"value":"c1401fa3-ae18-41e7-88f9-c18847c531fa"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"b9f68cc3-5dcf-4bb7-8c7a-551f0b3f0b07"}},{"text":"Full Stack Traces (bt full)","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Sometimes the brief backtrace just doesn’t offer enough and we want a full backtrace","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Command:","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb)","type":"text"},{"text":" bt full","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"Or","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"backtrace full","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"E.g.","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Core was generated by `./ipperte'.","type":"text"}]},{"type":"paragraph","content":[{"text":"Program terminated with signal SIGSEGV, Segmentation fault.","type":"text"}]},{"type":"paragraph","content":[{"text":"#0 0x00007fd5ffb4e8f3 in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) bt full","type":"text"}]},{"type":"paragraph","content":[{"text":"#0 0x00007fd5ffb4e8f3 in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"No symbol table info available.","type":"text"}]},{"type":"paragraph","content":[{"text":"#1 0x00007fd5ffc0d39d in __vfprintf_chk () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"No symbol table info available.","type":"text"}]},{"type":"paragraph","content":[{"text":"#2 0x000000000042d74f in vprintf (__ap=0x7fd344a27cf8, __fmt=0x52534d \"VI: %s registering [%s] [%d]\\n\")","type":"text"}]},{"type":"paragraph","content":[{"text":" at /usr/include/x86_64-linux-gnu/bits/stdio2.h:117","type":"text"}]},{"type":"paragraph","content":[{"text":"No locals.","type":"text"}]},{"type":"paragraph","content":[{"text":"#3 ippe_debug_print (debug=debug@entry=0, fmt=fmt@entry=0x52534d \"VI: %s registering [%s] [%d]\\n\")","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:339","type":"text"}]},{"type":"paragraph","content":[{"text":" args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fd344a27e90,","type":"text"}]},{"type":"paragraph","content":[{"text":" reg_save_area = 0x7fd344a27dc0}}","type":"text"}]},{"type":"paragraph","content":[{"text":" t = 1465210889","type":"text"}]},{"type":"paragraph","content":[{"text":" s = \"2016-06-06 11:01:29\\000\\000\\000\\000\\000qy\\273\\377\\325\\177\\000\\000`~\\242D\\323\\177\\000\\000\\340\\017\\354\\377\\325\\177\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\tXUW\\000\\000\\000\\000\\340v+M\\323\\177\\000\\000 ~\\242D\\323\\177\\000\\000 ~\\242D\\323\\177\\000\\000\\020~\\242D\\323\\177\\000\\000\\001\\000\\000\"","type":"text"}]},{"type":"paragraph","content":[{"text":" tm = {tm_sec = 29, tm_min = 1, tm_hour = 11, tm_mday = 6, tm_mon = 5, tm_year = 116, tm_wday = 1,","type":"text"}]},{"type":"paragraph","content":[{"text":" tm_yday = 157, tm_isdst = 0, tm_gmtoff = 0, tm_zone = 0x7fd5ffc81d50 \"GMT\"}","type":"text"}]},{"type":"paragraph","content":[{"text":"#4 0x0000000000428edd in ippe_register_port (","type":"text"}]},{"type":"paragraph","content":[{"text":" port_name=0x7fd34d368120 , input=input@entry=0,","type":"text"}]},{"type":"paragraph","content":[{"text":" output=output@entry=1) at /home/itrinegy/Development/ine-dpdk/dpdk.c:3311","type":"text"}]},{"type":"paragraph","content":[{"text":" core = 0x7fd574041e80","type":"text"}]},{"type":"paragraph","content":[{"text":" port = -1","type":"text"}]},{"type":"paragraph","content":[{"text":" i = ","type":"text"}]},{"type":"paragraph","content":[{"text":" port_list = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" port_count = 0","type":"text"}]},{"type":"paragraph","content":[{"text":"#5 0x00007fd5fdbfadd3 in __class_Symmetric_Routing_UserInput (inputParameter=0x7fd344a28140,","type":"text"}]},{"type":"paragraph","content":[{"text":" __this_ptr=0x7fd598db2da0, __td=) at /tmp/Default.c:13627","type":"text"}]},{"type":"paragraph","content":[{"text":" temp_list = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 1 '\\001',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" number_in_range = ","type":"text"}]},{"type":"paragraph","content":[{"text":" a = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" __Routes_ptr = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __VLAN_Id_ptr = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" n = ","type":"text"}]},{"type":"paragraph","content":[{"text":" r = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __this = 0x7fd598db2da0","type":"text"}]},{"type":"paragraph","content":[{"text":" number_in_list = ","type":"text"}]},{"type":"paragraph","content":[{"text":" temp_range = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 1 '\\001',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" __parameter_ptr = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __sb = {which = 1, {fptr = 0x7fd34d368120,","type":"text"}]},{"type":"paragraph","content":[{"text":" buffer = 0x7fd34d368120 }, size = 2048,","type":"text"}]},{"type":"paragraph","content":[{"text":" used = 6, next = 0x0}","type":"text"}]},{"type":"paragraph","content":[{"text":" __temp_list_ptr = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __IPAddress_ptr = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" __IPPort_ptr = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" Indexes = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 0 '\\000',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" p = ","type":"text"}]},{"type":"paragraph","content":[{"text":" list_item = ","type":"text"}]},{"type":"paragraph","content":[{"text":"#6 __class_Symmetric_Routing__ippe_input (__td=, __this_ptr=0x7fd598db2da0, argc=,","type":"text"}]},{"type":"paragraph","content":[{"text":" argv=) at /tmp/Default.c:13266","type":"text"}]},{"type":"paragraph","content":[{"text":" __this = ","type":"text"}]},{"type":"paragraph","content":[{"text":" i = ","type":"text"}]},{"type":"paragraph","content":[{"text":" indexes = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 0 '\\000',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" args = {vi = 0x0, emulation = 0x0, vi_data = 0x0, emulation_data = 0x0, global_data = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" parameter_size_ = 2, parameter = {size = 2, used = 2, last_accessed_index = 0, modified = 1 '\\001',","type":"text"}]},{"type":"paragraph","content":[{"text":" ref_required = 1 '\\001', type = 10 '\\n', head = 0x7fd58f79f520, tail = 0x7fd58f79f538,","type":"text"}]},{"type":"paragraph","content":[{"text":" used_tail = 0x7fd58f79f538, last_accessed = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" reset = 0x44a2c0 <__reset_object___ippe_module_input_data_params>, block_head = 0x7fd58f79f520,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_tail = 0x7fd58f79f520, block_size = 2, number_of_blocks = 1}}","type":"text"}]},{"type":"paragraph","content":[{"text":"#7 0x00000000004309bb in ippe_process_proc (module_id=module_id@entry=0,","type":"text"}]},{"type":"paragraph","content":[{"text":" proc=proc@entry=0x7fd31c000aed \"Symmetric_Routing\", index=60, id=, args=0x7fd31d3c1fd0,","type":"text"}]},{"type":"paragraph","content":[{"text":" args_len=4, __td=__td@entry=0x7fd344a28500, username=username@entry=0x7fd325398ec0 \"admin\")","type":"text"}]},{"type":"paragraph","content":[{"text":"---Type to continue, or q to quit---","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:7789","type":"text"}]},{"type":"paragraph","content":[{"text":" core = 0x7fd574041e80","type":"text"}]},{"type":"paragraph","content":[{"text":" m = ","type":"text"}]},{"type":"paragraph","content":[{"text":" i = 0x33b2570","type":"text"}]},{"type":"paragraph","content":[{"text":" pos = 0x7fd3505045c0","type":"text"}]},{"type":"paragraph","content":[{"text":" prev = ","type":"text"}]},{"type":"paragraph","content":[{"text":" remove = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" count = ","type":"text"}]},{"type":"paragraph","content":[{"text":" vi = 0x7fd573e5d900","type":"text"}]},{"type":"paragraph","content":[{"text":" new = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" current_proc = 0xa58500 ","type":"text"}]},{"type":"paragraph","content":[{"text":" current_output = 0x7fd5ffec3400 <_IO_2_1_stdout_>","type":"text"}]},{"type":"paragraph","content":[{"text":"#8 0x0000000000448b7e in update_kernel (args=args@entry=0x7fd31d3b8060, num_args=,","type":"text"}]},{"type":"paragraph","content":[{"text":" cl_ret=cl_ret@entry=0x7fd31c9c4920 \"\", UNUSED_fd=UNUSED_fd@entry=43, close_fd=close_fd@entry=0x7fd344a29dd0)","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:6278","type":"text"}]},{"type":"paragraph","content":[{"text":" __td = {ippe_module_error_code = 0, ippe_module_error_message = 0x0, memory = 0x0}","type":"text"}]},{"type":"paragraph","content":[{"text":" object = 0x7fd31c000aed \"Symmetric_Routing\"","type":"text"}]},{"type":"paragraph","content":[{"text":" module_id = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" m = 0x7fd31d3c1b30","type":"text"}]},{"type":"paragraph","content":[{"text":" tmpm = 0x7fd31d3c2000","type":"text"}]},{"type":"paragraph","content":[{"text":" index = ","type":"text"}]},{"type":"paragraph","content":[{"text":" i = ","type":"text"}]},{"type":"paragraph","content":[{"text":" pid = 10059","type":"text"}]},{"type":"paragraph","content":[{"text":" vi = 0x7fd31d3bb1b0","type":"text"}]},{"type":"paragraph","content":[{"text":" start = ","type":"text"}]},{"type":"paragraph","content":[{"text":" stop = ","type":"text"}]},{"type":"paragraph","content":[{"text":" stop_all = ","type":"text"}]},{"type":"paragraph","content":[{"text":" getif = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_services = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_emulations = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_vi_settings = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_vis_for_emulation = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_version = ","type":"text"}]},{"type":"paragraph","content":[{"text":" license_status = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_port_settings = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_service_settings = ","type":"text"}]},{"type":"paragraph","content":[{"text":" save_running_as_default = ","type":"text"}]},{"type":"paragraph","content":[{"text":" user_set = ","type":"text"}]},{"type":"paragraph","content":[{"text":" update_port = ","type":"text"}]},{"type":"paragraph","content":[{"text":" port_remove = ","type":"text"}]},{"type":"paragraph","content":[{"text":" update_service = ","type":"text"}]},{"type":"paragraph","content":[{"text":" ret = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" no_print = ","type":"text"}]},{"type":"paragraph","content":[{"text":" error = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" point = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" emulation_id = ","type":"text"}]},{"type":"paragraph","content":[{"text":" emulation_name = ","type":"text"}]},{"type":"paragraph","content":[{"text":" notes = ","type":"text"}]},{"type":"paragraph","content":[{"text":" noop = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_modules = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_port_stats = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_module_interfaces = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_module_object = ","type":"text"}]},{"type":"paragraph","content":[{"text":" core = 0x7fd574041e80","type":"text"}]},{"type":"paragraph","content":[{"text":" test = ","type":"text"}]},{"type":"paragraph","content":[{"text":" port_name = ","type":"text"}]},{"type":"paragraph","content":[{"text":" license_element = ","type":"text"}]},{"type":"paragraph","content":[{"text":" test_result = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" service_remove = ","type":"text"}]},{"type":"paragraph","content":[{"text":" dump_memory = ","type":"text"}]},{"type":"paragraph","content":[{"text":" user = ","type":"text"}]},{"type":"paragraph","content":[{"text":" tmp_user = {sid = '\\000' , username = '\\000' , login = 0,","type":"text"}]},{"type":"paragraph","content":[{"text":" last_accessed = 0, expire_time = 0, prev = 0x0, next = 0x0}","type":"text"}]},{"type":"paragraph","content":[{"text":" admin_user = ","type":"text"}]},{"type":"paragraph","content":[{"text":" uc = ","type":"text"}]},{"type":"paragraph","content":[{"text":" save_user_emulation = ","type":"text"}]},{"type":"paragraph","content":[{"text":" delete_user_emu = ","type":"text"}]},{"type":"paragraph","content":[{"text":" run_emulation = ","type":"text"}]},{"type":"paragraph","content":[{"text":" list_emulations = ","type":"text"}]},{"type":"paragraph","content":[{"text":"---Type to continue, or q to quit---","type":"text"}]},{"type":"paragraph","content":[{"text":" create_folder = ","type":"text"}]},{"type":"paragraph","content":[{"text":" delete_folder = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" upload_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" rename_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" tail_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" share_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" unshare_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" copy_file = ","type":"text"}]},{"type":"paragraph","content":[{"text":" list_file_shares = ","type":"text"}]},{"type":"paragraph","content":[{"text":" capture_packets = ","type":"text"}]},{"type":"paragraph","content":[{"text":" stop_capture_packets = ","type":"text"}]},{"type":"paragraph","content":[{"text":" configure_port = ","type":"text"}]},{"type":"paragraph","content":[{"text":" get_number_vis_for_emulation = ","type":"text"}]},{"type":"paragraph","content":[{"text":" delete_default_emulation = ","type":"text"}]},{"type":"paragraph","content":[{"text":" verify_emulation = ","type":"text"}]},{"type":"paragraph","content":[{"text":"#9 0x000000000044a005 in interpret_commands (fd=fd@entry=43, buf=buf@entry=0x7fd31c0008c0 \"--sessionId\",","type":"text"}]},{"type":"paragraph","content":[{"text":" close_fd=close_fd@entry=0x7fd344a29dd0) at /home/itrinegy/Development/ine-dpdk/ipperte.c:1972","type":"text"}]},{"type":"paragraph","content":[{"text":" result = 28","type":"text"}]},{"type":"paragraph","content":[{"text":" point = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" args = 0x7fd31d3b8060","type":"text"}]},{"type":"paragraph","content":[{"text":" i = ","type":"text"}]},{"type":"paragraph","content":[{"text":" pid = 10059","type":"text"}]},{"type":"paragraph","content":[{"text":" ret = 0x7fd31c9c4920 \"\"","type":"text"}]},{"type":"paragraph","content":[{"text":" j = 0","type":"text"}]},{"type":"paragraph","content":[{"text":"#10 0x000000000044a187 in read_data (data=) at /home/itrinegy/Development/ine-dpdk/ipperte.c:1921","type":"text"}]},{"type":"paragraph","content":[{"text":" fd = 43","type":"text"}]},{"type":"paragraph","content":[{"text":" bytes = ","type":"text"}]},{"type":"paragraph","content":[{"text":" buf = 0x7fd31c0008c0 \"--sessionId\"","type":"text"}]},{"type":"paragraph","content":[{"text":" ptr = 0x7fd31c000cbb \"\"","type":"text"}]},{"type":"paragraph","content":[{"text":" total_read = 1019","type":"text"}]},{"type":"paragraph","content":[{"text":" i = 0","type":"text"}]},{"type":"paragraph","content":[{"text":" used = ","type":"text"}]},{"type":"paragraph","content":[{"text":" pid = 10059","type":"text"}]},{"type":"paragraph","content":[{"text":" close_fd = 0","type":"text"}]},{"type":"paragraph","content":[{"text":"#11 0x00007fd5ffed1182 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0","type":"text"}]},{"type":"paragraph","content":[{"text":"No symbol table info available.","type":"text"}]},{"type":"paragraph","content":[{"text":"#12 0x00007fd5ffbfdfbd in clone () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph","content":[{"text":"No symbol table info available.","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb)","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"This gives much more information about the parameter passed etc, unfortunately in the case of IPPERTE/PEPL much is optimised out","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":2},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_c5hdmbypwyh6"}},"macroMetadata":{"macroId":{"value":"f7862931-2eeb-497f-b745-26dbccec3473"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"6ad00471-1116-476e-80a2-9dbb7b56063d"}},{"text":"Equating c names to pepl names","type":"text"}]},{"type":"heading","attrs":{"level":3},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_qjfo5ifun4zi"}},"macroMetadata":{"macroId":{"value":"52a1e034-0d50-482f-8080-909777c8986b"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"da9dfd98-1269-421b-bfc0-64682886f8ad"}},{"text":"C Function names to PEPL Class and Procs","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"There’s no exact way of doing this for scalar variables the pepl and c variable names are identical for example in frame 5 of ","type":"text"},{"text":"bt full","type":"text","marks":[{"type":"strong"}]},{"text":" above:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"#5 0x00007fd5fdbfadd3 in __class_Symmetric_Routing_UserInput (inputParameter=0x7fd344a28140,","type":"text"}]},{"type":"paragraph","content":[{"text":" __this_ptr=0x7fd598db2da0, __td=) at /tmp/Default.c:13627","type":"text"}]},{"type":"paragraph","content":[{"text":" temp_list = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 1 '\\001',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" number_in_range = ","type":"text"}]},{"type":"paragraph","content":[{"text":" a = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" __Routes_ptr = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __VLAN_Id_ptr = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" n = ","type":"text"}]},{"type":"paragraph","content":[{"text":" r = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __this = 0x7fd598db2da0","type":"text"}]},{"type":"paragraph","content":[{"text":" number_in_list = ","type":"text"}]},{"type":"paragraph","content":[{"text":" temp_range = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 1 '\\001',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" __parameter_ptr = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __sb = {which = 1, {fptr = 0x7fd34d368120,","type":"text"}]},{"type":"paragraph","content":[{"text":" buffer = 0x7fd34d368120 }, size = 2048,","type":"text"}]},{"type":"paragraph","content":[{"text":" used = 6, next = 0x0}","type":"text"}]},{"type":"paragraph","content":[{"text":" __temp_list_ptr = ","type":"text"}]},{"type":"paragraph","content":[{"text":" __IPAddress_ptr = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" __IPPort_ptr = 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":" Indexes = {size = 0, used = 0, last_accessed_index = 0, modified = 0 '\\000', ref_required = 0 '\\000',","type":"text"}]},{"type":"paragraph","content":[{"text":" type = 0 '\\000', head = 0x0, tail = 0x0, used_tail = 0x0, last_accessed = 0x0, reset = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" block_head = 0x0, block_tail = 0x0, block_size = 16, number_of_blocks = 0}","type":"text"}]},{"type":"paragraph","content":[{"text":" p = ","type":"text"}]},{"type":"paragraph","content":[{"text":" list_item = ","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"We see the c function name: ","type":"text"},{"text":"__class_Symmetric_Routing_UserInput","type":"text","marks":[{"type":"strong"}]},{"text":" ","type":"text"}]},{"type":"paragraph","content":[{"text":"This equates to the pepl class ","type":"text"},{"text":"Symmetric_Routing ","type":"text","marks":[{"type":"strong"}]},{"text":"and the Proc (method) within it called ","type":"text"},{"text":"UserInput","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"So now we clearly know what pepl proc was running at the time of the problem. Stack frame 4 tells us that the pepl had called:","type":"text"},{"text":" ippe_register_port","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":2},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_cgum1iy1y3mp"}},"macroMetadata":{"macroId":{"value":"b00cebe7-69e2-408a-8c1a-7d2573c39c05"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"c86d90ab-32fa-42f0-afbf-eaa110a87c79"}},{"text":"Internal Function names","type":"text"}]},{"type":"paragraph","content":[{"text":"So from the above we see that the function ","type":"text"},{"text":"ippe_register_port ","type":"text","marks":[{"type":"strong"}]},{"text":"was called, but in our PEPL source code there is no such call. Of course we might guess that’s it’ll be related to port registration but there is a way to be more certain:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Search the file ","type":"text"},{"text":"~/ine/import/system/pepl-defs.pepl ","type":"text","marks":[{"type":"strong"}]},{"text":"for ","type":"text"},{"text":"ippe_register_port ","type":"text","marks":[{"type":"strong"}]},{"text":"(using vi or vim to get the context. This mostly, but not always delivers results. In this case we find the block:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Cdecl Proc registerPort","type":"text"}]},{"type":"paragraph","content":[{"text":"\tInput String p","type":"text"}]},{"type":"paragraph","content":[{"text":"\tInput TrueFalse input_required","type":"text"}]},{"type":"paragraph","content":[{"text":"\tInput TrueFalse output_required","type":"text"}]},{"type":"paragraph","content":[{"text":"\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\tReturn Number","type":"text"}]},{"type":"paragraph","content":[{"text":"EndProc","type":"text"}]},{"type":"paragraph","content":[{"text":"Calias Proc registerPort ippe_register_port","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Which tells us that the c function ","type":"text"},{"text":"ippe_register_port ","type":"text","marks":[{"type":"strong"}]},{"text":"is aliased to the PEPL proc ","type":"text"},{"text":"registerPort ","type":"text","marks":[{"type":"strong"}]},{"text":" and so that’s what we’re looking for in our PEPL source code. It also tells us that there are 3 parameters to this function and from stack frame 4 we see:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"port_name=0x7fd34d368120 , input=input@entry=0,","type":"text"}]},{"type":"paragraph","content":[{"text":" output=output@entry=1)","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"So we don’t know what the first (port_name) parameter is but we do know that the next two parameters are 0 and 1 respectively and so our call in PEPL will look something like: ","type":"text"},{"text":"registerPort(port_name,0,1)","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"In fact we find 3 instances of ","type":"text"},{"text":"registerPort ","type":"text","marks":[{"type":"strong"}]},{"text":"in UserInput in class Symmetric_Routing:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"\t\tPort_In_Id = ","type":"text"},{"text":"registerPort","type":"text","marks":[{"type":"strong"}]},{"text":"(Port_In, True, False)","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"\t\tif Port_In_Id > IPPE_PORT_ERROR_START","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\tif Port_In_Id = IPPE_PORT_UNSPECIFIED","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t\t# It's allowed","type":"text"}]},{"type":"paragraph","content":[{"text":"\t elif Port_In_Id = IPPE_PORT_REGISTERED","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t Error IPPE_PORT_REGISTERED \"Object \" + currentVI.name + \": \" + \"Input port (\" + Port_In + \") already in use\"","type":"text"}]},{"type":"paragraph","content":[{"text":"\t elif Port_In_Id = IPPE_INVALID_PORT","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t Error IPPE_INVALID_PORT \"Object \" + currentVI.name + \": \" + \"No such port (\" + Port_In + \") available\"","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t else","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t\tError 1 \"Object \" + currentVI.name + \": \" + \"Unknown port error: \" + Port_In_Id","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\tendif\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tendif","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tPort_Out_Id = ","type":"text"},{"text":"registerPort","type":"text","marks":[{"type":"strong"}]},{"text":"(Port_Out, False, True)","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tif Port_Out_Id > IPPE_PORT_ERROR_START","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\tif Port_Out_Id = IPPE_PORT_UNSPECIFIED","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t\t# It's allowed","type":"text"}]},{"type":"paragraph","content":[{"text":"\t elif Port_Out_Id = IPPE_PORT_REGISTERED","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t Error IPPE_PORT_REGISTERED \"Object \" + currentVI.name + \": \" + \"Output port (\" + Port_Out + \") already in use\"","type":"text"}]},{"type":"paragraph","content":[{"text":"\t elif Port_Out_Id = IPPE_INVALID_PORT","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t Error IPPE_INVALID_PORT \"Object \" + currentVI.name + \": \" + \"No such port (\" + Port_Out + \") available\"","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t else","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t\tError 1 \"Object \" + currentVI.name + \": \" + \"Unknown port error: \" + Port_Out_Id","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\tendif\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tendif","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t# start assuming no default route\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tDefault_Route_Id = IPPE_INVALID_PORT # This is 64 bit -1 in an unsigned int64","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tRoute_to_Default = False","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tlog \"\"","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tlog \" Processing Routes for VI: \" + currentVI.name","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tlog \"\"","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t# now check the array","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\tforall Routes r","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\tr.Port_In_Id = toPortId(r.Port_In)","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t# the \"error\" IPPE_PORT_UNSPECIFIED will be treated as valid lower down","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\t","type":"text"}]},{"type":"paragraph","content":[{"text":"\t\t\tr.Port_Out_Id = ","type":"text"},{"text":"registerPort","type":"text","marks":[{"type":"strong"}]},{"text":"(r.Port_Out, False, True)","type":"text"}]},{"type":"paragraph","content":[{"text":"…etc.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"The first of these is eliminated because its parameters are the wrong way round: Internally False = 0 and True = 1 in PEPL","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"The one in the forall loop was eliminated by looking at the ","type":"text"},{"text":"ippe.log ","type":"text","marks":[{"type":"strong"}]},{"text":" file and noting which VI was being updated. It was a line object and that had an empty routing table.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"That left the second instance: ","type":"text"}]},{"type":"paragraph","content":[{"text":"Port_Out_Id = ","type":"text"},{"text":"registerPort","type":"text","marks":[{"type":"strong"}]},{"text":"(Port_Out, False, True) ","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":3},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_bk1vaos9mbgw"}},"macroMetadata":{"macroId":{"value":"4e80acf5-386d-4a60-bcd8-79d343ffe9ad"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"073bb7cb-f3d4-432f-ad08-93e43efe5e06"}},{"text":"Variable names","type":"text"}]},{"type":"paragraph","content":[{"text":"Variables in PEPL generally match closely to their C names. 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Also notice that even though we declared them half way up a proc they are moved into a struct which has all the variables at the top of the corresponding c function.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"For completeness it worth noting that: ","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"What happened to the variable declared as: ","type":"text"},{"text":"Number i","type":"text","marks":[{"type":"strong"}]},{"text":" - it is not in the c struct? The answer to this is that it was never used and so PEPL optimised it out. ","type":"text"}]},{"type":"paragraph"},{"type":"paragraph"},{"type":"heading","attrs":{"level":3},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_v2bzimkk4n4k"}},"macroMetadata":{"macroId":{"value":"646fc26e-f34d-411b-9f2e-a696ceb415c4"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"bd0e683d-fbc9-4c1f-9bf1-a7c389949462"}},{"text":"Displaying Variable Contents","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"While ","type":"text"},{"text":"bt full","type":"text","marks":[{"type":"strong"}]},{"text":" will show you the values of variables in the stack frames - which is good sometimes we want to see the contents of memory, where available:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"For this we use ","type":"text"},{"text":"print","type":"text","marks":[{"type":"strong"}]},{"text":" e.g.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"m->module[0]","type":"text"}]},{"type":"paragraph","content":[{"text":"Cannot access memory at address 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"m->module","type":"text"}]},{"type":"paragraph","content":[{"text":"$1 = (char **) 0x0","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"*m","type":"text"}]},{"type":"paragraph","content":[{"text":"$2 = {module = 0x0, result = -1, next = 0x7f516dce8da0}","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"num_args","type":"text"}]},{"type":"paragraph","content":[{"text":"$3 = ","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"args[0]","type":"text"}]},{"type":"paragraph","content":[{"text":"$4 = 0x7f516c000a00 \"--sessionId\"","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"args[1]","type":"text"}]},{"type":"paragraph","content":[{"text":"$5 = 0x7f516c000a0c \"a1d03fc1a8720f8047c8236f91815321\"","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"args[2]","type":"text"}]},{"type":"paragraph","content":[{"text":"$6 = 0x7f516c000a2d \"--id\"","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"args[3]","type":"text"}]},{"type":"paragraph","content":[{"text":"$7 = 0x7f516c000a32 \"3584\"","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print ","type":"text","marks":[{"type":"strong"}]},{"text":"args[4]","type":"text"}]},{"type":"paragraph","content":[{"text":"$8 = 0x7f516c000a37 \"--name\"","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Notice that pointers -> are followed and we can look at the contents of a pointed to variable with *. 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This is useful when large arrays actually contain only short strings. The default is ","type":"text"},{"text":"off","type":"text","marks":[{"type":"strong"}]},{"text":". ","type":"text"}]},{"type":"paragraph","content":[{"text":"show print null-stop","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"Show whether gdb stops printing an array on the first null character. ","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":4},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_69jzjoffzur9"}},"macroMetadata":{"macroId":{"value":"27a10f70-d18c-461a-bc67-bd4c33d2ef36"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"2b8455da-0935-4bbf-b449-f3532e4c1bfb"}},{"text":"Printing stdin and stdout","type":"text"}]},{"type":"paragraph","content":[{"text":"It can be useful to see what’s just been input or output (note for the ipperte for this may give a good clue as the last command processed and therefore the time…):","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print *stdin","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"$1 = {_flags = -72540024, _IO_read_ptr = 0x0, _IO_read_end = 0x0, _IO_read_base = 0x0, _IO_write_base = 0x0, _IO_write_ptr = 0x0, _IO_write_end = 0x0, _IO_buf_base = 0x0, _IO_buf_end = 0x0, _IO_save_base = 0x0,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_backup_base = 0x0, _IO_save_end = 0x0, _markers = 0x0, _chain = 0x0, _fileno = 0, _flags2 = 0, _old_offset = -1, _cur_column = 0, _vtable_offset = 0 '\\000', _shortbuf = \"\", _lock = 0x7f59373829f0,","type":"text"}]},{"type":"paragraph","content":[{"text":" _offset = -1, __pad1 = 0x0, __pad2 = 0x7f5937381720, __pad3 = 0x0, __pad4 = 0x0, __pad5 = 0, _mode = 0, _unused2 = '\\000' }","type":"text"}]},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print *stdout","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"$2 = {_flags = -72537980,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_read_ptr = 0x7f593834c000 \"2017-02-10 22:30:02: Updating proc Random_Packet_Move_Offset parameters for VI Full Duplex6: Router1 --> Game Controller5\\noller5\\\" --procModule \\\"Default:Debug;10;Dump_Packet;0;Bytes_to_Dump;80;\\\" --proc\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_read_end = 0x7f593834c000 \"2017-02-10 22:30:02: Updating proc Random_Packet_Move_Offset parameters for VI Full Duplex6: Router1 --> Game Controller5\\noller5\\\" --procModule \\\"Default:Debug;10;Dump_Packet;0;Bytes_to_Dump;80;\\\" --proc\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_read_base = 0x7f593834c000 \"2017-02-10 22:30:02: Updating proc Random_Packet_Move_Offset parameters for VI Full Duplex6: Router1 --> Game Controller5\\noller5\\\" --procModule \\\"Default:Debug;10;Dump_Packet;0;Bytes_to_Dump;80;\\\" --proc\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_write_base = 0x7f593834c000 \"2017-02-10 22:30:02: Updating proc Random_Packet_Move_Offset parameters for VI Full Duplex6: Router1 --> Game Controller5\\noller5\\\" --procModule \\\"Default:Debug;10;Dump_Packet;0;Bytes_to_Dump;80;\\\" --proc\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_write_ptr = 0x7f593834c000 \"2017-02-10 22:30:02: Updating proc Random_Packet_Move_Offset parameters for VI Full Duplex6: Router1 --> Game Controller5\\noller5\\\" --procModule \\\"Default:Debug;10;Dump_Packet;0;Bytes_to_Dump;80;\\\" --proc\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_write_end = 0x7f593834d000 \"Name Dont_Fragment_Flag_Option -- Value Fragment Anyway\\n: Router1 --> Game Controller5\\n0 Port Out: Full Duplex12: Game Controller11 --> Router1 Port Out Id: 512 Port Out Channel: 0 Default Route: 0 Di\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_buf_base = 0x7f593834c000 \"2017-02-10 22:30:02: Updating proc Random_Packet_Move_Offset parameters for VI Full Duplex6: Router1 --> Game Controller5\\noller5\\\" --procModule \\\"Default:Debug;10;Dump_Packet;0;Bytes_to_Dump;80;\\\" --proc\"...,","type":"text"}]},{"type":"paragraph","content":[{"text":" _IO_buf_end = 0x7f593834d000 \"Name Dont_Fragment_Flag_Option -- Value Fragment Anyway\\n: Router1 --> Game Controller5\\n0 Port Out: Full Duplex12: Game Controller11 --> Router1 Port Out Id: 512 Port Out Channel: 0 Default Route: 0 Di\"..., _IO_save_base = 0x0, _IO_backup_base = 0x0, _IO_save_end = 0x0, _markers = 0x0, _chain = 0x7f5937381640 <_IO_2_1_stdin_>, _fileno = 1, _flags2 = 0, _old_offset = -1, _cur_column = 0,","type":"text"}]},{"type":"paragraph","content":[{"text":" _vtable_offset = 0 '\\000', _shortbuf = \"\", _lock = 0x7f59373829e0, _offset = -1, __pad1 = 0x0, __pad2 = 0x7f59373814e0, __pad3 = 0x0, __pad4 = 0x0, __pad5 = 0, _mode = -1, _unused2 = '\\000' ","type":"text"}]},{"type":"paragraph"},{"type":"heading","attrs":{"level":4},"content":[{"type":"inlineExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"anchor","parameters":{"macroParams":{"":{"value":"_5n425ck9cumg"}},"macroMetadata":{"macroId":{"value":"d2ef9b34-2ff1-4e29-beab-0c6fe2d76d89"},"schemaVersion":{"value":"1"},"title":"Anchor"}},"localId":"c60f621d-181c-4ce1-b8aa-dcd5e87b9307"}},{"text":"Moving around the stack","type":"text"}]},{"type":"paragraph","content":[{"text":"Sometimes we want to inspect variables in stack frames other than 0, to do this we can use the command ","type":"text"},{"text":"select ","type":"text","marks":[{"type":"strong"}]},{"text":" to change reference to a different stack frame e.g.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"bt","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"#0 0x00000000004473fa in update_kernel (args=args@entry=0x7f516dc981c0, num_args=,","type":"text"}]},{"type":"paragraph","content":[{"text":" cl_ret=cl_ret@entry=0x7f516c9c4a10 \"\", UNUSED_fd=UNUSED_fd@entry=115, close_fd=close_fd@entry=0x7f51727fbdd0)","type":"text"}]},{"type":"paragraph","content":[{"text":" at /home/itrinegy/Development/ine-dpdk/ipperte.c:5875","type":"text"}]},{"type":"paragraph","content":[{"text":"#1 0x0000000000447ba5 in interpret_commands (fd=fd@entry=115, buf=buf@entry=0x7f516c000a00 \"--sessionId\",","type":"text"}]},{"type":"paragraph","content":[{"text":" close_fd=close_fd@entry=0x7f51727fbdd0) at /home/itrinegy/Development/ine-dpdk/ipperte.c:1805","type":"text"}]},{"type":"paragraph","content":[{"text":"#2 0x0000000000447d35 in read_data (data=) at /home/itrinegy/Development/ine-dpdk/ipperte.c:1754","type":"text"}]},{"type":"paragraph","content":[{"text":"#3 0x00007f593738f182 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0","type":"text"}]},{"type":"paragraph","content":[{"text":"#4 0x00007f59370bbfbd in clone () from /lib/x86_64-linux-gnu/libc.so.6","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Choose stack frame 1 from above:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"select 1","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"Now any printing is from stack frame 1 e.g.:","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"(gdb) ","type":"text"},{"text":"print buf","type":"text","marks":[{"type":"strong"}]}]},{"type":"paragraph","content":[{"text":"$18 = 0x7f516c000a00 \"--sessionId\"","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":"...and if we were in -tui (text user interface) mode then select would change us to the new stack frame and automatically display the source (in c) associated with that.","type":"text"}]},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph"},{"type":"paragraph","content":[{"text":" ","type":"text"}]},{"type":"paragraph"},{"type":"paragraph","content":[{"text":" ","type":"text"}]},{"type":"paragraph"}],"version":1}

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