[asterisk-dev] Possible deadlock situation in chan_sip.c?

[Moises Silva]

Harald, the error says that chan_sip is waiting for the lock, the
deadlock is probably in other unkown place in the code.

On 3/22/07, Harald Raetscher <hra at teamware-gmbh.de> wrote:
> I don't know if the code in the for loop can break, but how is it
> possible that the iflock hasn't been released. The log that I've already
> posted points to this situation, right?
>
> Again:
> [Mar 16 12:31:18] ERROR[11927]
> /usr/src/asterisk/asterisk-1.4.1/include/asterisk/lock.h: chan_sip.c
> line 4303 (sip_alloc): Deadlock? waited 5 sec for mutex '&iflock'?
> [Mar 16 12:31:18] ERROR[11927]
> /usr/src/asterisk/asterisk-1.4.1/include/asterisk/lock.h: chan_sip.c
> line 14920 (do_monitor): '&iflock' was locked here.
> [Mar 16 12:31:18] ERROR[11942]
> /usr/src/asterisk/asterisk-1.4.1/include/asterisk/lock.h: pbx.c line
> 2105 (ast_extension_state_del): Deadlock? waited 5 sec for mutex
> '&(&hints)->lock'?
> [Mar 16 12:31:18] ERROR[11942]
> /usr/src/asterisk/asterisk-1.4.1/include/asterisk/lock.h: pbx.c line
> 1982 (ast_hint_state_changed): '&(&hints)->lock' was locked here.
> [Mar 16 12:31:18] ERROR[11927]
> /usr/src/asterisk/asterisk-1.4.1/include/asterisk/lock.h: chan_sip.c
> line 4303 (sip_alloc): Deadlock? waited 5 sec for mutex '&iflock'?
> ...
>
> Regards,
>
> Harald Rätscher
>
> Harald Raetscher wrote:
> > Can this code section from chan_sip.c (begin at line 14920) cause
> > deadlocks if any error occurs between the mutex lock for iflock?
>
> What do you mean by 'any error'? Is there code in that for loop that can
> cause the function to be existed without releasing the lock? If not,
> there is no path through the function that would not end up releasing
> the lock.
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