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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3438/">https://reviewboard.asterisk.org/r/3438/</a>
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<p style="margin-top: 0;">On April 11th, 2014, 9:06 p.m. CDT, <b>Corey Farrell</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3438/diff/1/?file=57236#file57236line6379" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 1)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">6379</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span>p->timercid = -1;<span class="tb"> </span>/* event gone, will not be rescheduled */</pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I am concerned about a repeat of https://reviewboard.asterisk.org/r/3368/. It seems like the timer can be rescheduled or cancelled from another thread while we wait for the pvt lock.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It could happen here. Luckily, in this case it should be relatively easy to handle by simply checking that timercid is not -1 within the locked pvt. As long as the pvt is locked when we delete the scheduled task, this should prevent executing the congestion code at the same time as deleting the reference.
I've combined what this would potentially look like along with using sip_pvt_lock_full in my other finding.</pre>
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<p>- Matt</p>
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<p>On April 11th, 2014, 3:41 a.m. CDT, Olle E Johansson wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Olle E Johansson.</div>
<p style="color: grey;"><i>Updated April 11, 2014, 3:41 a.m.</i></p>
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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;">SIP Timer C is defined for proxys that forward messages. In some ways, we forward calls. It is activated when we receive a 100 trying and wait for any other message. If that's not received, timer C triggers and cancels the call attempt.
This is required in an interoperability test I'm working with.
Red dots will be handled in the way they deserve.</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;">Passed interoperability testing with funky test tool.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/configs/sip.conf.sample <span style="color: grey">(412166)</span></li>
<li>/trunk/channels/sip/include/sip.h <span style="color: grey">(412166)</span></li>
<li>/trunk/channels/chan_sip.c <span style="color: grey">(412166)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3438/diff/" style="margin-left: 3em;">View Diff</a></p>
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