[Asterisk-code-review] chan sip.c: Fix provisional keepalive sched id deadlock. (asterisk[13])

[Richard Mudgett]

Richard Mudgett has uploaded a new patch set (#2).

Change subject: chan_sip.c: Fix provisional_keepalive_sched_id deadlock.
......................................................................

chan_sip.c: Fix provisional_keepalive_sched_id deadlock.

This patch is part of a series to resolve deadlocks in chan_sip.c.

Stopping a scheduled event can result in a deadlock if the scheduled event
is running when you try to stop the event.  If you hold a lock needed by
the scheduled event while trying to stop the scheduled event then a
deadlock can happen.  The general strategy for resolving the deadlock
potential is to push the actual starting and stopping of the scheduled
events off onto the scheduler/do_monitor() thread by scheduling an
immediate one shot scheduled event.  Some restructuring may be needed
because the code may assume that the start/stop of the scheduled events is
immediate.

ASTERISK-25023

Change-Id: I98a694fd42bc81436c83aa92de03226e6e4e3f48
---
M channels/chan_sip.c
1 file changed, 80 insertions(+), 27 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/93/2393/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I98a694fd42bc81436c83aa92de03226e6e4e3f48
Gerrit-PatchSet: 2
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Richard Mudgett <rmudgett at digium.com>
Gerrit-Reviewer: Anonymous Coward #1000019