[Home]

Summary:ASTERISK-12726: 5277 Segmentation fault
Reporter:Jonn Taylor (jonnt)Labels:
Date Opened:2008-09-12 22:23:24Date Closed:2008-09-19 10:33:50
Priority:CriticalRegression?No
Status:Closed/CompleteComponents:Channels/chan_agent
Versions:Frequency of
Occurrence
Related
Issues:
Environment:Attachments:( 0) 13476.patch
( 1) gdb.txt
( 2) gdb2.txt
Description:home*CLI> core stop gracefully

/usr/sbin/safe_asterisk: line 138:  5277 Segmentation fault      (core dumped) nice -n $PRIORITY ${ASTSBINDIR}/asterisk -f ${CLIARGS} ${ASTARGS} >&/dev/${TTY} < /dev/${TTY}
Asterisk ended with exit status 139
Asterisk exited on signal 11.

home*CLI> core stop now
home*CLI>
Disconnected from Asterisk server
Executing last minute cleanups
[root@home asterisk]# Asterisk ended with exit status 0
Asterisk shutdown normally.
Comments:By: snuffy (snuffy) 2008-09-13 18:10:40

we need a backtrace..
follow the guidelines in doc/backtrace.txt
By: Jonn Taylor (jonnt) 2008-09-14 08:51:57

Sorry missed the part about not uploading the cor file. Here is the gdb.txt
By: snuffy (snuffy) 2008-09-14 17:41:54

Could you recompile your asterisk with 'dont optimize' under compiler options?
See if you can also reproduce the crash?
By: Jonn Taylor (jonnt) 2008-09-14 23:02:55

Recompiled and the same thing happened.

home*CLI> stop gracefully
home*CLI>
Disconnected from Asterisk server
Executing last minute cleanups
[root@home asterisk]# /usr/sbin/safe_asterisk: line 138: 26347 Segmentation fault      (core dumped) nice -n $PRIORITY ${ASTSBINDIR}/asterisk -f ${CLIARGS} ${ASTARGS} >&/dev/${TTY} < /dev/${TTY}
Asterisk ended with exit status 139
Asterisk exited on signal 11.
cat: /var/run/asterisk.pid: No such file or directory
Automatically restarting Asterisk.
By: Mark Michelson (mmichelson) 2008-09-17 16:47:11

It seems as though the agent device state subscription is NULL, and that causes a problem when we try to unsubscribe. I have made a patch which simply tests that the pointer is non-NULL prior to calling ast_event_unsubscribe. Please test 13476.patch to see if it fixes the problem. I created the patch against the the latest 1.6.0 subversion checkout, but the patch should also apply cleanly to the 1.6.0-rc6 tag as well.
By: Jonn Taylor (jonnt) 2008-09-18 06:44:19

That fixed it. Clean shut down.
By: Digium Subversion (svnbot) 2008-09-19 10:33:48

Repository: asterisk
Revision: 143609

U   trunk/channels/chan_agent.c

------------------------------------------------------------------------
r143609 | mmichelson | 2008-09-19 10:33:47 -0500 (Fri, 19 Sep 2008) | 11 lines

We should only unsubscribe to the device state event
subscription if we have previously subscribed. Otherwise
a segfault will occur.

(closes issue ASTERISK-12726)
Reported by: jonnt
Patches:
     13476.patch uploaded by putnopvut (license 60)
Tested by: jonnt


------------------------------------------------------------------------

http://svn.digium.com/view/asterisk?view=rev&revision=143609