[Freeswitch-users] Crash in v1.6.5

Alex Balashov abalashov at evaristesys.com
Sat Jan 2 23:22:11 MSK 2016

(Cross-posting from Freeswitch-dev because that list doesn't appear to 
be terribly active? Perhaps I am mistaken, in which case, sorry!)


I'm running v1.6.5:70b8c17, and recently ran into this crash scenario:

(gdb) where
#0  switch_core_session_get_channel (session=0x0) at 
#1  0x00007f955ec53ce9 in sofia_update_callee_id (session=0x0, 
profile=0x1a7ce80, sip=0x7f940c20b728, send=SWITCH_TRUE) at sofia.c:1086
#2  0x00007f955ec59e55 in our_sofia_event_callback (event=nua_i_update, 
status=200, phrase=0x7f9525d82270 "OK", nua=0x7f953c0120e0, 
profile=0x1a7ce80, nh=0x7f944fc705a0,
     sofia_private=0x7f944ef34460, sip=0x7f940c20b728, 
de=0x7f953c012d40, tags=0x7f9525d82260) at sofia.c:1594
#3  0x00007f955ec5f4fb in sofia_process_dispatch_event (dep=<value 
optimized out>) at sofia.c:1983
#4  0x00007f955ec60266 in sofia_msg_thread_run (thread=<value optimized 
out>, obj=0x7f955ebf5ad8) at sofia.c:2031
#5  0x00007f95625f899b in dummy_worker (opaque=0x1a732d0) at 
#6  0x00007f95617a2a51 in start_thread () from /lib64/libpthread.so.0
#7  0x0000003acfae893d in clone () from /lib64/libc.so.6

Specifically, the crash was on an assertion that tried to dereference a 
null session pointer:

#0  switch_core_session_get_channel (session=0x0) at 
1357        switch_assert(session->channel);

However, while I am a C programmer, I don't know the first thing about 
FS internals and thus don't know what else to look for in this core dump 
so as to make a useful report. My assumption is that a check for NULL 
session pointer somewhere in frames 0/1 isn't really an adequate 
compensatory mechanism because the root of the problem lies elsewhere.

I did manage to track down the definition of Sofia's 'sip_t' structure 
and, it looks to me like this happened while either generating a 200 OK 
response to an UPDATE request:

(gdb) print sip->sip_request->rq_method
$1 = sip_method_update

And it doesn't appear to be in the course of processing a reply, because 
the status substructure seems blank:

(gdb) print sip->sip_status
$2 = (sip_status_t *) 0x0

However, I don't know how to get at the raw message buffer of the UPDATE 

Any help would be appreciated!

-- Alex

Alex Balashov | Principal | Evariste Systems LLC
303 Perimeter Center North, Suite 300
Atlanta, GA 30346
United States

Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/

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