[sr-dev] crash (segfault) on Kamailio master branch

[Jason Penton]

Hey Daniel,

Got it once so far... I'll take a look at that commit and see what it did -
but very strange indeed.

Cheers
Jason

On Mon, 5 Oct 2015 at 15:42 Daniel-Constantin Mierla <miconda at gmail.com>
wrote:

> Hello,
>
> the only recent change in the tcp core was resetting a flag to avoid
> infinite log messages (until connection was closed) via commit
> d36734d658cd0bcfc8357c7e85ca32da0612aaee .
>
> Does it happen often, or you got it just once so far?
>
> Cheers,
> Daniel
>
>
> On 05/10/15 08:29, Jason Penton wrote:
>
> Hey guys,
>
> Not sure if there have been any changes but I have an interesting problem
> here when using TCP:
>
> *The BT is as follows:*
>
> #0  local_timer_list_expire (h=0xa0f128 <tcp_reader_ltimer+178664>,
> t=723807134, l=0x9e3740 <tcp_reader_ltimer>) at local_timer.c:198
> #1  local_timer_expire (t=723807134, h=<optimized out>) at
> local_timer.c:227
> #2  local_timer_run (lt=lt at entry=0x9e3740 <tcp_reader_ltimer>,
> saved_ticks=723807150) at local_timer.c:250
> #3  0x00000000005d8417 in tcp_reader_timer_run () at tcp_read.c:1682
> #4  tcp_receive_loop (unix_sock=<optimized out>) at tcp_read.c:1734
> #5  0x00000000005c81c8 in tcp_init_children () at tcp_main.c:4788
> #6  0x00000000004a9da3 in main_loop () at main.c:1664
> #7  0x000000000042411e in main (argc=<optimized out>, argv=<optimized
> out>) at main.c:2566
>
> This seems to be related to clearing timers for TCP connections. The crash
> is related to the following code:
>
> *_timer_rm_list(tl)*
>
> where it does a null pointer deref on tl->next and tl->prev, which,
> according to the bt, are null (see below).
>
> *(gdb) print *tl*
> $14 = {next = 0x0, prev = 0x0, expire = 723807134, initial_timeout = 32,
> data = 0x7fbbb05aa628, f = 0x5d02f0 <tcpconn_read_timeout>, flags = 512,
> slow_idx = 0}
>
> Any ideas?
>
> Cheers
> Jason
>
>
>
>
>
>
> _______________________________________________
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>
>
> --
> Daniel-Constantin Mierlahttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Book: SIP Routing With Kamailio - http://www.asipto.com
> Kamailio Advanced Training, Sep 28-30, 2015, in Berlin - http://asipto.com/u/kat
>
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