[sr-dev] [Fwd: Re: [SR-Users] Kamailio 1.5 stops processing messages]

[Andrei Pelinescu-Onciul]

On Jun 12, 2010 at 13:19, Santiago Gimeno <santiago.gimeno at gmail.com> wrote:
> Hi,
> 
> 2010/5/26 Andrei Pelinescu-Onciul <andrei at iptel.org>
> 
> >
> > Does the same deadlock appears with 3.0/sip-router?
> >
> 
> I have tried to reproduce the problem with the master version from git. (
> kamctl fifo version shows: Server:: kamailio (3.0.99-dev1 (i386/linux))). I
> have used a modified version of kamailio.cfg sample file so it supports
> pua_dialoginfo and presence_dialoginfo. After some hours of testing, one of
> the udp worker processes has blocked.

By "blocked" you mean eating 100% cpu?
Could you run a ps -lwwww <pid_of_blocked_process> ?

> From the backtrace, the deadlock
> doesn't look the same but apparently the pua_dialoginfo module is also
> involved. Here is the backtrace:
> 
> #0  0xb764766e in strncmp () from /lib/i686/cmov/libc.so.6
> #1  0xb6f63ea2 in search_htable (pres=0xbfffc828, hash_code=359) at
> 
[...]

> I have gone through the code and the process is blocked in this line of code
> at ./modules_k/pua/hash.c:127
> 
> if((p->pres_uri->len==pres->pres_uri->len) &&
>                     (strncmp(p->pres_uri->s,
> pres->pres_uri->s,pres->pres_uri->len)==0))
> 
> but I don't understand why it is blocking in the strncmp function as all the
> values seem ok. From gdb:
> 
> (gdb) print p->pres_uri->s
> $8 = 0xa7294204 "sip:service at 192.168.1.47:5060D
> IALOG_PUBLISH.598-3004 at 127.0.1.1\nm=audio 6000 RTP/AVP 0\r\na=rtpmap:0
> PCMU/8000\r\n"
> (gdb) print p->pres_uri->len
> $9 = 29
> (gdb) print pres->pres_uri->len
> $10 = 29
> (gdb) print pres->pres_uri->s
> $11 = 0x82d8850 "sip:service at 192.168.1.47:5060u\210-\b#\002"
> 
> Any idea why this is happening?
> 

If it's using 100% cpu it might mean the list that search_htable()
iterates on is corrupted and has become cyclic.

You could also try compiling with debugging options, e.g.:
make config mode=debug; make all
or 
make config CC_EXTRA_OPTS="-O0" ; make all


Andrei