[libnice] TRANSITION(CONNECTING, GATHERING) in agent.c/agent_signal_component_state_change

[Olivier Crête]

Hi,

Can you get a stack trace when the assertion is triggered? It's
definitely not a valid transition. How often can you reproduce this? Do
you have an easy way to trigger it ?

If you're running a production server, you can always compile with -
DG_DISABLE_ASSERT if you want to not abort. But it would really help me
if you have a way to know where this invalid transition is called from.

Olivier

On Tue, 2021-07-20 at 14:00 +0100, Graham Hazel wrote:
> Hi,
> 
> I'm running the Janus WebRTC Server to handle some video transport and
> on several occasions have observed an assertion firing in libnice
> (agent/agent.c, line 2573) during an ICE restart.
> 
> It appears likely that adding TRANSITION(CONNECTING, GATHERING) to the
> list of valid state changes in the assert statement "fixes" the issue.
> 
> Now, I fully admit both (a) I'm probably doing "something weird" in my
> setup to hit this case surprisingly often; and (b) I have very little
> idea what any of the libnice code is doing. So my very naive question
> is: is this actually a valid transition that's missing from the
> assertion, or is something bad happening that I'm now ignoring?
> 
> Thanks!
> Graham
> 
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-- 
Olivier Crête
olivier.crete at collabora.com