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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3368/">https://reviewboard.asterisk.org/r/3368/</a>
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<p>Ship it!</p>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Thanks for untangling this one, I think this shows that changing the scheduler API in trunk is worth it.</pre>
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<a href="https://reviewboard.asterisk.org/r/3368/diff/1/?file=56174#file56174line4443" style="color: black; font-weight: bold; text-decoration: underline;">/tags/1.8.25.0/channels/chan_sip.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void add_blank(struct sip_request *req)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>if ( old_sched_id != pvt->provisional_keepalive_sched_id ) {</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Minor nit, no space immediately after ( or before ).</pre>
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<a href="https://reviewboard.asterisk.org/r/3368/diff/1/?file=56174#file56174line4445" style="color: black; font-weight: bold; text-decoration: underline;">/tags/1.8.25.0/channels/chan_sip.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void add_blank(struct sip_request *req)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>if (chan) {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>ast_channel_unlock(chan);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span>chan = ast_channel_unref(chan);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>}</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>sip_pvt_unlock(pvt);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>dialog_unref(pvt, "dialog ref for provisional keepalive");</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span>return 0;</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I would prefer we use a goto here instead of duplicating this code, but since this works around a crash I don't want to hold it up over a few duplicated lines.
https://wiki.asterisk.org/wiki/display/AST/Coding+Guidelines#CodingGuidelines-Labels/gotoareacceptable</pre>
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<p>- Corey Farrell</p>
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<p>On March 17th, 2014, 10:21 a.m. EDT, one47 wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By one47.</div>
<p style="color: grey;"><i>Updated March 17, 2014, 10:21 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-22079">ASTERISK-22079</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">As requested, here is a workaround (not a fix) for the SIP SEGV caused by a scheduler race condition.
If a provisional keepalive is simultaneously rescheduled/cancelled, and executed by 2 parallel threads, then a scheduled event can be leaked.
The correct fix will probably involve a re-factoring of the scheduler so that a scheduled-job-reference is held by the owner, rather than just a scheduled-job-id as at present. That is outside the scope of this fix, which simply re-checks that the scheduler-id is unchanged after the lock has been obtained when running the scheduled job.
There is probably scope for doing this is several other scheduled function calls.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Run on live server for several weeks.
Tested on load-test environment with following dialplan, which previously caused a crash in < 30 mins at 1 call per second.
exten => 900,1,NoOp(Crash Generator)
same => n,Ringing
same => n,Wait(60)
same => n,Progress
same => n,Hangup</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/tags/1.8.25.0/channels/chan_sip.c <span style="color: grey">(408955)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3368/diff/" style="margin-left: 3em;">View Diff</a></p>
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