git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6467 65c4cc65-6c06-0410-ace0-fbb531ad65f3
170 lines
6.3 KiB
Text
Executable file
170 lines
6.3 KiB
Text
Executable file
|
|
|
|
This document is to provide information on how to obtain the backtraces required on the asterisk bug tracker, available at http://bugs.digium.com.
|
|
The information is required by developers to help fix problem with bugs of any kind.
|
|
Backtraces provide information about what was wrong when a program crashed; in our case, Asterisk.
|
|
There are two kind of backtraces (aka 'bt'), which are useful: bt and bt full.
|
|
|
|
First of all, when you start Asterisk, you MUST start it with option -g (this tells Asterisk to produce a core file if it crashes).
|
|
If you start Asterisk with the safe_asterisk script, it automatically starts using the option -g.
|
|
|
|
If you're not sure if Asterisk is running with the -g option, type the following command in your shell:
|
|
|
|
debian:/tmp# ps aux | grep asterisk
|
|
root 17832 0.0 1.2 2348 788 pts/1 S Aug12 0:00 /bin/sh /usr/sbin/safe_asterisk
|
|
root 26686 0.0 2.8 15544 1744 pts/1 S Aug13 0:02 asterisk -vvvg -c
|
|
[...]
|
|
|
|
The interesting information is located in the last column.
|
|
|
|
|
|
After Asterisk crashes, a core file will be "dumped" in your /tmp/ directory
|
|
To make sure it's really there, you can just type the following command in your shell:
|
|
|
|
debian:/tmp# ls -l /tmp/core.*
|
|
-rw------- 1 root root 10592256 Aug 12 19:40 /tmp/core.26252
|
|
-rw------- 1 root root 9924608 Aug 12 20:12 /tmp/core.26340
|
|
-rw------- 1 root root 10862592 Aug 12 20:14 /tmp/core.26374
|
|
-rw------- 1 root root 9105408 Aug 12 20:19 /tmp/core.26426
|
|
-rw------- 1 root root 9441280 Aug 12 20:20 /tmp/core.26462
|
|
-rw------- 1 root root 8331264 Aug 13 00:32 /tmp/core.26647
|
|
debian:/tmp#
|
|
|
|
Now that we've verified the core file has been written to disk, the final part is to extract 'bt' from the core file.
|
|
Core files are pretty big, don't be scared, it's normal.
|
|
|
|
*** NOTE: Don't attach core files on the bug tracker, we only need the bt and bt full. ***
|
|
|
|
For extraction, we use a really nice tool, called gdb. To verify that you have gdb installed on your system:
|
|
|
|
debian:/tmp# gdb -v
|
|
GNU gdb 6.3-debian
|
|
Copyright 2004 Free Software Foundation, Inc.
|
|
GDB is free software, covered by the GNU General Public License, and you are
|
|
welcome to change it and/or distribute copies of it under certain conditions.
|
|
Type "show copying" to see the conditions.
|
|
There is absolutely no warranty for GDB. Type "show warranty" for details.
|
|
This GDB was configured as "i386-linux".
|
|
debian:/tmp#
|
|
|
|
Which is great, we can continue. If you don't have gdb installed, go install gdb.
|
|
|
|
Now load the core file in gdb, as follows:
|
|
|
|
debian:/tmp# gdb -se "asterisk" -c /tmp/core.26252
|
|
[...]
|
|
(You would see a lot of output here.)
|
|
[...]
|
|
Reading symbols from /usr/lib/asterisk/modules/app_externalivr.so...done.
|
|
Loaded symbols for /usr/lib/asterisk/modules/app_externalivr.so
|
|
#0 0x29b45d7e in ?? ()
|
|
(gdb)
|
|
|
|
Now at the gdb prompt, type: bt
|
|
You would see output similar to:
|
|
(gdb) bt
|
|
#0 0x29b45d7e in ?? ()
|
|
#1 0x08180bf8 in ?? ()
|
|
#2 0xbcdffa58 in ?? ()
|
|
#3 0x08180bf8 in ?? ()
|
|
#4 0xbcdffa60 in ?? ()
|
|
#5 0x08180bf8 in ?? ()
|
|
#6 0x180bf894 in ?? ()
|
|
#7 0x0bf80008 in ?? ()
|
|
#8 0x180b0818 in ?? ()
|
|
#9 0x08068008 in ast_stopstream (tmp=0x40758d38) at file.c:180
|
|
#10 0x000000a0 in ?? ()
|
|
#11 0x000000a0 in ?? ()
|
|
#12 0x00000000 in ?? ()
|
|
#13 0x407513c3 in confcall_careful_stream (conf=0x8180bf8, filename=0x8181de8 "Zap/pseudo-1324221520") at app_meetme.c:262
|
|
#14 0x40751332 in streamconfthread (args=0x8180bf8) at app_meetme.c:1965
|
|
#15 0xbcdffbe0 in ?? ()
|
|
#16 0x40028e51 in pthread_start_thread () from /lib/libpthread.so.0
|
|
#17 0x401ec92a in clone () from /lib/libc.so.6
|
|
(gdb)
|
|
|
|
|
|
The bt's output is the informations that we need on the bug tracker.
|
|
|
|
Now do a bt full as follows:
|
|
(gdb) bt full
|
|
#0 0x29b45d7e in ?? ()
|
|
No symbol table info available.
|
|
#1 0x08180bf8 in ?? ()
|
|
No symbol table info available.
|
|
#2 0xbcdffa58 in ?? ()
|
|
No symbol table info available.
|
|
#3 0x08180bf8 in ?? ()
|
|
No symbol table info available.
|
|
#4 0xbcdffa60 in ?? ()
|
|
No symbol table info available.
|
|
#5 0x08180bf8 in ?? ()
|
|
No symbol table info available.
|
|
#6 0x180bf894 in ?? ()
|
|
No symbol table info available.
|
|
#7 0x0bf80008 in ?? ()
|
|
No symbol table info available.
|
|
#8 0x180b0818 in ?? ()
|
|
No symbol table info available.
|
|
#9 0x08068008 in ast_stopstream (tmp=0x40758d38) at file.c:180
|
|
No locals.
|
|
#10 0x000000a0 in ?? ()
|
|
No symbol table info available.
|
|
#11 0x000000a0 in ?? ()
|
|
No symbol table info available.
|
|
#12 0x00000000 in ?? ()
|
|
No symbol table info available.
|
|
#13 0x407513c3 in confcall_careful_stream (conf=0x8180bf8, filename=0x8181de8 "Zap/pseudo-1324221520") at app_meetme.c:262
|
|
f = (struct ast_frame *) 0x8180bf8
|
|
trans = (struct ast_trans_pvt *) 0x0
|
|
#14 0x40751332 in streamconfthread (args=0x8180bf8) at app_meetme.c:1965
|
|
No locals.
|
|
#15 0xbcdffbe0 in ?? ()
|
|
No symbol table info available.
|
|
#16 0x40028e51 in pthread_start_thread () from /lib/libpthread.so.0
|
|
No symbol table info available.
|
|
#17 0x401ec92a in clone () from /lib/libc.so.6
|
|
No symbol table info available.
|
|
(gdb)
|
|
|
|
|
|
We also need gdb's output.
|
|
That output gives more details compared to the simple "bt". So we recommend that you use bt full instead of bt.
|
|
But, if you could include both, we appreciate that.
|
|
|
|
The final "extraction" would the to know all traces by all threads. Even if asterisk runs on the same thread for each calls, it could have some new threads created.
|
|
To make sure we have the correct informations, just do:
|
|
(gdb) thread apply all bt
|
|
|
|
Thread 1 (process 26252):
|
|
#0 0x29b45d7e in ?? ()
|
|
#1 0x08180bf8 in ?? ()
|
|
#2 0xbcdffa58 in ?? ()
|
|
#3 0x08180bf8 in ?? ()
|
|
#4 0xbcdffa60 in ?? ()
|
|
#5 0x08180bf8 in ?? ()
|
|
#6 0x180bf894 in ?? ()
|
|
#7 0x0bf80008 in ?? ()
|
|
#8 0x180b0818 in ?? ()
|
|
#9 0x08068008 in ast_stopstream (tmp=0x40758d38) at file.c:180
|
|
#10 0x000000a0 in ?? ()
|
|
#11 0x000000a0 in ?? ()
|
|
#12 0x00000000 in ?? ()
|
|
#13 0x407513c3 in confcall_careful_stream (conf=0x8180bf8, filename=0x8181de8 "Zap/pseudo-1324221520") at app_meetme.c:262
|
|
#14 0x40751332 in streamconfthread (args=0x8180bf8) at app_meetme.c:1965
|
|
#15 0xbcdffbe0 in ?? ()
|
|
#16 0x40028e51 in pthread_start_thread () from /lib/libpthread.so.0
|
|
#17 0x401ec92a in clone () from /lib/libc.so.6
|
|
(gdb)
|
|
|
|
|
|
That output tell us crucial informations for threads.
|
|
|
|
Now, just create a output.txt and dump your "bt full" (and/or "bt") AND with "thread apply all bt".
|
|
|
|
Note: Please ATTACH your output, DO NOT paste it as a note.
|
|
|
|
And you're ready for upload on bug tracker.
|
|
|
|
|
|
Questions or comments regarding this documentation, feel free to pass by #asterisk-bugs on FreeNode. |