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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1322/">https://reviewboard.asterisk.org/r/1322/</a>
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<a href="https://reviewboard.asterisk.org/r/1322/diff/1/?file=17557#file17557line22788" style="color: black; font-weight: bold; text-decoration: underline;">/tags/1.8.5-rc1/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 int handle_request_refer(struct sip_pvt *p, struct sip_request *req, int debug, int seqno, int *nounlock)</pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Must release lock now, because it will not longer</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> be accessible after the transfer! */</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">*</span><span class="n">nounlock</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Increase ref count so that we can delay channel destruction until after</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * we get a chance to fire off some events.</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> */</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_ref</span><span class="p">(</span><span class="n">current</span><span class="p">.</span><span class="n">chan1</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_pvt_unlock</span><span class="p">(</span><span class="n">p</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_unlock</span><span class="p">(</span><span class="n">current</span><span class="p">.</span><span class="n">chan1</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Parking a call */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Parking a call */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">refer</span><span class="o">-></span><span class="n">localtransfer</span> <span class="o">&&</span> <span class="n">ast_parking_ext_valid</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">refer</span><span class="o">-></span><span class="n">refer_to</span><span class="p">,</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">,</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="o">-></span><span class="n">context</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">refer</span><span class="o">-></span><span class="n">localtransfer</span> <span class="o">&&</span> <span class="n">ast_parking_ext_valid</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">refer</span><span class="o">-></span><span class="n">refer_to</span><span class="p">,</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="p">,</span> <span class="n">p</span><span class="o">-></span><span class="n">owner</span><span class="o">-></span><span class="n">context</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_pvt_lock</span><span class="p">(</span><span class="n">p</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">copy_request</span><span class="p">(</span><span class="o">&</span><span class="n">current</span><span class="p">.</span><span class="n">req</span><span class="p">,</span> <span class="n">req</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">copy_request</span><span class="p">(</span><span class="o">&</span><span class="n">current</span><span class="p">.</span><span class="n">req</span><span class="p">,</span> <span class="n">req</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_clear_flag</span><span class="p">(</span><span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">flags</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">SIP_GOTREFER</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_clear_flag</span><span class="p">(</span><span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">flags</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">SIP_GOTREFER</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">p</span><span class="o">-></span><span class="n">refer</span><span class="o">-></span><span class="n">status</span> <span class="o">=</span> <span class="n">REFER_200OK</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">p</span><span class="o">-></span><span class="n">refer</span><span class="o">-></span><span class="n">status</span> <span class="o">=</span> <span class="n">REFER_200OK</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">append_history</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="s">"Xfer"</span><span class="p">,</span> <span class="s">"REFER to call parking."</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">append_history</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="s">"Xfer"</span><span class="p">,</span> <span class="s">"REFER to call parking."</span><span class="p">);</span></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;">The pvt has to be unlocked here because there are instances where p->owner is locked in ast_parking_ext_valid(). The owner is unlocked at this point so that causes locking inversion between the pvt and owner.
Could the pvt just be unlocked before calling sip_park() and locked again afterwards to fix this?</pre>
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<p>- David</p>
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<p>On July 18th, 2011, 1:48 p.m., irroot wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By irroot.</div>
<p style="color: grey;"><i>Updated July 18, 2011, 1:48 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;">=======================================================================
=== Currently Held Locks ==============================================
=======================================================================
===
=== <pending> <lock#> (<file>): <lock type> <line num> <function> <lock name> <lock addr> (times locked)
===
=== Thread ID: 0xb6e91b90 (do_monitor started at [25036] chan_sip.c restart_monitor())
=== ---> Lock #0 (chan_sip.c): MUTEX 24551 handle_request_do &netlock 0x1d3f80 (1)
=== ---> Lock #1 (chan_sip.c): MUTEX 22802 handle_request_refer p 0x9fe9170 (1)
=== ---> Lock #2 (channel.c): MUTEX 6300 ast_do_masquerade channels 0x9c0daf8 (1)
=== ---> Tried and failed to get Lock #3 (channel.c): MUTEX 6323 ast_do_masquerade clonechan 0xb6e1978 (0)
=== -------------------------------------------------------------------
===
=== Thread ID: 0x1e4cb90 (pbx_thread started at [ 5079] pbx.c ast_pbx_start())
=== ---> Lock #0 (channel.c): MUTEX 4749 ast_write chan 0xad3ba860 (1)
=== -------------------------------------------------------------------
===
=== Thread ID: 0x54a0b90 (pbx_thread started at [ 5079] pbx.c ast_pbx_start())
=== ---> Lock #0 (channel.c): MUTEX 3714 __ast_read chan 0xb6e1978 (1)
=== ---> Waiting for Lock #1 (chan_sip.c): MUTEX 7234 sip_read p 0x9fe9170 (1)
=== --- ---> Locked Here: chan_sip.c line 22802 (handle_request_refer)
=== -------------------------------------------------------------------
===
=======================================================================</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-18149">ASTERISK-18149</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>/tags/1.8.5-rc1/channels/chan_sip.c <span style="color: grey">(325799)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1322/diff/" style="margin-left: 3em;">View Diff</a></p>
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