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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;">The locking here hurts my head. Oh the pain...</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line14933" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</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">sip_pvt_ptr</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">sip_pvt_ptr</span><span class="p">)</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 error exits here fail to unref sip_pvt_ptr.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line20998" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</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">ast_channel_masquerade</span><span class="p">(</span><span class="n">peerb</span><span class="p">,</span> <span class="n">peerc</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">ast_channel_masquerade</span><span class="p">(</span><span class="n">peerb</span><span class="p">,</span> <span class="n">peerc</span><span class="p">))</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;">Uh oh... deadlock potential
peerb is locked, peerc is not locked
ast_channel_masquerade() is going to do deadlock avoidance to get peerc lock.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22489" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</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">targetcall_pvt</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">targetcall_pvt</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 if is not needed. Just unref it.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22496" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">target</span><span class="p">.</span><span class="n">chan2</span> <span class="o">=</span> <span class="n">ast_bridged_channel</span><span class="p">(</span><span class="n">targetcall_pvt</span><span class="o">-></span><span class="n">owner</span><span class="p">);</span> <span class="cm">/* Asterisk to target */</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">target</span><span class="p">.</span><span class="n">chan2</span> <span class="o">=</span> <span class="n">ast_bridged_channel</span><span class="p">(</span><span class="n">targetcall_pvt</span><span class="o">-></span><span class="n">owner</span><span class="p">);</span> <span class="cm">/* Asterisk to target */</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;">We really need an
ast_bridged_channel_ref()
that returns a reference to the bridged channel. The legacy ast_bridged_channel() can then be made to call the new function and remove the reference on the returned channel.
The ast_bridged_channel() should then be deprecated as risky to use!</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22587" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</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">target</span><span class="p">.</span><span class="n">chan2</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">target</span><span class="p">.</span><span class="n">chan2</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="n">ast_indicate</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan2</span><span class="p">,</span> <span class="n">AST_CONTROL_UNHOLD</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_indicate</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan2</span><span class="p">,</span> <span class="n">AST_CONTROL_UNHOLD</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="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="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">current</span><span class="o">-></span><span class="n">chan2</span> <span class="o">&&</span> <span class="n">current</span><span class="o">-></span><span class="n">chan2</span><span class="o">-></span><span class="n">_state</span> <span class="o">==</span> <span class="n">AST_STATE_RING</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">current</span><span class="o">-></span><span class="n">chan2</span> <span class="o">&&</span> <span class="n">current</span><span class="o">-></span><span class="n">chan2</span><span class="o">-></span><span class="n">_state</span> <span class="o">==</span> <span class="n">AST_STATE_RING</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="n">ast_indicate</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan1</span><span class="p">,</span> <span class="n">AST_CONTROL_RINGING</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_indicate</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan1</span><span class="p">,</span> <span class="n">AST_CONTROL_RINGING</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="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="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></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">target</span><span class="p">.</span><span class="n">chan2</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">target</span><span class="p">.</span><span class="n">chan2</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="n">ast_channel_queue_connected_line_update</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan1</span><span class="p">,</span> <span class="o">&</span><span class="n">connected_to_transferee</span><span class="p">,</span> <span class="nb">NULL</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_channel_queue_connected_line_update</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan1</span><span class="p">,</span> <span class="o">&</span><span class="n">connected_to_transferee</span><span class="p">,</span> <span class="nb">NULL</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_channel_queue_connected_line_update</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan2</span><span class="p">,</span> <span class="o">&</span><span class="n">connected_to_target</span><span class="p">,</span> <span class="nb">NULL</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_channel_queue_connected_line_update</span><span class="p">(</span><span class="n">target</span><span class="p">.</span><span class="n">chan2</span><span class="p">,</span> <span class="o">&</span><span class="n">connected_to_target</span><span class="p">,</span> <span class="nb">NULL</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;">We have no references to x.chan2 channels so when we release the locks on x.chan1 channels, x.chan2 is not guaranteed to be valid anymore!</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22634" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</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">targetcall_pvt</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">targetcall_pvt</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;">Same here just unref it. targetcall_pvt cannot be NULL.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22705" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="hl"> </span><span class="k"><span class="hl">struct</span></span><span class="hl"> </span><span class="n"><span class="hl">sip_dual</span></span><span class="hl"> </span><span class="n"><span class="hl">current</span></span><span class="p"><span class="hl">;</span></span> <span class="cm">/* Chan1: Call between asterisk and transferer<span class="hl"> */</span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Chan1: Call between asterisk and transferer</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="hl"> </span><span class="cm"><span class="hl">/</span>* Chan2: Call between asterisk and transferee */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Chan2: Call between asterisk and transferee */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">sip_dual</span> <span class="n">current</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span><span class="p">,</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;">Make this a doxygen comment for the variable.
/*!
* current.chan1: ...
* current.chan2: ...
*/</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22767" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">res</span> <span class="o">=</span> <span class="n">get_refer_info</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">req</span><span class="p">);</span> <span class="cm">/* Extract headers */</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">res</span> <span class="o">=</span> <span class="n">get_refer_info</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">req</span><span class="p">);</span> <span class="cm">/* Extract headers */</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_SENT</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_SENT</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;">Calling get_refer_info() with p and p->owner locked is probably not good.
get_refer_info() calls pbx_builtin_setvar_helper() on the bridged peer of p and thus would need deadlock avoidance between p->owner and peer.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22896" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="n">res</span><span class="p">;</span> <span class="cm">/* We're done with the transfer */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">((</span><span class="n">res</span> <span class="o">=</span> <span class="n">local_attended_transfer</span><span class="p">(</span><span class="n">p</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">seqno</span><span class="p">,</span> <span class="n">nounlock</span><span class="p">)))</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;">local_attended_transfer() calls get_sip_pvt_byid_locked(). Since p and p->owner are already locked, we can have a deadlock when get_sip_pvt_byid_locked() attempts to lock the referred dialog. The deadlock potential is reduced by the deadlock avoidance done by get_sip_pvt_byid_locked() but not entirely eliminated since the locks already held could be wanted by some other transfer request.
Reference leak in get_sip_pvt_byid_locked()!
The sip_pvt_ptr is not unreffed for error exits it is only unlocked.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22906" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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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="#fdfebc" 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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Copy data we can no safely access after letting the pvt lock go. */</span></pre></td>
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<td bgcolor="#fdfebc" 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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">refer_to</span> <span class="o">=</span> <span class="n">ast_strdupa</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></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;">Typo:
can no safely
should be
cannot safely</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22925" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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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="#fdfebc" 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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Parking a call. DO NOT hold any locks while calling ast_parking_ext_valid() */</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;">Is the note a result of a deadlock seen?
If it is then a similar deadlock interaction with conlock and channels could occur in get_refer_info() when it calls ast_exists_extension().</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line22968" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Blind transfers and remote attended xfers<span class="hl"> */</span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Blind transfers and remote attended xfers<span class="hl">.</span></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 XXX note here is not needed.
If you already hold the channel lock to the channel passed to pbx_builtin_setvar_helper() then you are fine.</pre>
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<a href="https://reviewboard.asterisk.org/r/1339/diff/2/?file=17704#file17704line23034" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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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="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" 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="kt">char</span> <span class="o">*</span><span class="n">refer_to_context</span> <span class="o">=</span> <span class="n">ast_strdupa</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_context</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="kt">char</span> <span class="o">*</span><span class="n">refer_to</span> <span class="o">=</span> <span class="n">ast_strdupa</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></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* Do not hold the pvt lock during the indicate and async_goto. Those functions</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">/* Do not hold the pvt lock during the indicate and async_goto. Those functions</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"> * lock channels which will invalidate locking order if the pvt lock is held.*/</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"> * lock channels which will invalidate locking order if the pvt lock is held.*/</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;">Swap the pvt unlock and comment here since that is why the comment is here and it is what the comment is saying to do.</pre>
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<p>- rmudgett</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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