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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1339/">https://reviewboard.asterisk.org/r/1339/</a>
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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 understand this issue is sort of a rabbit hole with locking, but I need to limit the scope of what I am going to address in this fix to the deadlock issues directly resulting from problems in the handle_request_refer() function. The potential deadlocks you have pointed out in the local_attended_transfer function involve problems with the preconditions to that function.</pre>
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<p>- David</p>
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<p>On August 2nd, 2011, 4:28 p.m., David Vossel wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By David Vossel.</div>
<p style="color: grey;"><i>Updated Aug. 2, 2011, 4:28 p.m.</i></p>
<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;">handle_request_refer() is a complete mess when it comes to locking. A deadlock occurs, we fix it, and then it moves somewhere else. This patch attempts to resolve all the possible locking inversion issues that can occur in this function.</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;">I tested refer using a snom phone with blind transfer, but that is not very impressive.
James Van Vleet has tested this code using a load testing tool that was capable of exposing all sorts of problems. He has reported that his test is running without issue using this iteration of the patch. Given what it was capable of exposing earlier, I am confident in these test results.</pre>
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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-18082">ASTERISK-18082</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.8/channels/chan_sip.c <span style="color: grey">(330671)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1339/diff/" style="margin-left: 3em;">View Diff</a></p>
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