[Asterisk-Users] chan_local segfault

[Karl Putland]

Happened twice.  There might also be a race condition and some bad
pointers in chan_local.locals_show.

First the segfault.

CLI> show locals
<unowned> -- 6001 at default
Segmentation fault (core dumped)
[root at mars asterisk]# ll -tr
total 22260

[...]
Loaded symbols for /usr/lib/asterisk/modules/chan_local.so
#0  __pthread_mutex_lock (mutex=0x5d8) at mutex.c:99
99      mutex.c: No such file or directory.
        in mutex.c
(gdb) bt
#0  __pthread_mutex_lock (mutex=0x5d8) at mutex.c:99
#1  0x4161ed29 in locals_show (fd=1, argc=2, argv=0xbffff770) at chan_local.c:358
#2  0x08067268 in ast_cli_command (fd=1, s=0x80be7c8 "show locals") at cli.c:911
#3  0x080777ab in consolehandler (s=0x80be7c8 "show locals") at asterisk.c:475
#4  0x080792ed in main (argc=2, argv=0xbffffc74) at asterisk.c:1335
#5  0x400c8336 in __libc_start_main (main=0x8078900 <main>, argc=2, ubp_av=0xbffffc74, init=0x804ff8c <_init>, fini=0x8099e50 <_fini>, rtld_fini=0x4000d2fc <_dl_fini>, 
    stack_end=0xbffffc6c) at ../sysdeps/generic/libc-start.c:129
(gdb) 


Now for something completely different.

*CLI> show locals
Local/6001 at default-1 -- 6001 at default
<unowned> -- __se at s 2

*CLI> show locals
Local/6001 at default-1 -- 6001 at default
<unowned> -- __se at s 2

    -- Nobody picked up in 20000 ms
    -- Hungup 'IAX[peracles]/4'
    -- Executing VoiceMail("Local/6001 at default-1", "u1234") in new stack
  == Parsing '/etc/asterisk/voicemail.conf': Found
    -- Playing 'vm/1234/unavail'
    -- Playing 'vm-intro'
    -- Playing 'beep'
    -- Recording to /var/spool/asterisk/vm/1234/INBOX/msg0012
WARNING[21525]: File app_voicemail.c, Line 631 (leave_voicemail): No
audio available on Local/6001 at default-1??
    -- User hung up
  == Parsing '/etc/asterisk/voicemail.conf': Found
  == Spawn extension (macro-stdexten, s, 2) exited non-zero on
'Local/6001 at default-1' in macro 'stdexten'
  == Spawn extension (default, 1999, 1) exited non-zero on
'Local/6001 at default-1'
    -- User disconnected when they almost made it
  == Spawn extension (default, 6001, 2) exited non-zero on
'Local/6001 at default-2'
show locals
<unowned> -- 6001 at default
UåWVSì|ÇE -- @s 2

Segmentation fault (core dumped)

This segfault Produced same traceback as above




The above results were produced by

extenstion.conf

exten => 1998,1,Macro(stdexten,1234,IAX/kputland)
exten => 1999,1,Macro(stdexten,1234,IAX/peracles)

exten => 6001,1,Answer
exten => 6001,2,Queue(dialer)



Executing this command on the manager port.

Action: Originate
Exten: 1999
Channel: Local/6001

Then running 
show locals
over and over and over again rather quickly.


-- 
Karl Putland <karl at putland.linux-site.net>