[Tarantool-patches] [PATCH v2] relay: fix segfault on replica transition from anonymous

[Kirill Yukhin]

Hello,

On 13 апр 13:34, Serge Petrenko wrote:
> relay_subscribe_f sets a recovery trigger notifying tx when a full log
> is read and gc consumer corresponding to the replica may be advanced.
> Since anonymous replicas do not have gc consumers, the trigger isn't
> added for them. However, on relay exit, the trigger deletion depends
> on replica->anon flag. This is buggy in case relay stalls on exit due to
> replica disconnect. Replica has time to reconnect and register as a
> normal instance, hence its replica->anon flag will be false by the time
> we check whether to clear triggers or not, effectively making us to
> clear unset triggers and segfault.
> 
> Fix this by initializing the triggers with trigger_create(), which
> allows a trigger_clear() call, even if the triggers are not set, and
> omit the replica->anon check.
> 
> Closes #4731
> 
> Acked-by: Cyrill Gorcunov <gorcunov at gmail.com>
> ---
> https://github.com/tarantool/tarantool/tree/sp/gh-4731-anon-segfault-v2
> https://github.com/tarantool/tarantool/issues/4731

I've checked your patch into 2.3 and master.

--
Regards, Kirill Yukhin