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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/2965/">https://reviewboard.asterisk.org/r/2965/</a>
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<a href="https://reviewboard.asterisk.org/r/2965/diff/1/?file=47645#file47645line492" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/res/stasis/control.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; ">struct ast_bridge *stasis_app_get_bridge(struct stasis_app_control *control)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">void</span> <span class="o">*</span><span class="nf">bridge_channel_depart</span><span class="p">(</span><span class="k">struct</span> <span class="n">stasis_app_control</span> <span class="o">*</span><span class="n">control</span><span class="p">,</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="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">data</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;">I expect you are going to have conflicts with app_control_continue() and app_control_remove_channel_from_bridge() because they depart the channel as well.
I think using departable channels for stasis is just wrong. I suggest looking at app_agent_pool.c for how to reclaim control of a channel when it leaves a bridge.</pre>
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<a href="https://reviewboard.asterisk.org/r/2965/diff/1/?file=47645#file47645line533" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/res/stasis/control.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 bridge_after_cb(struct ast_channel *chan, void *data)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">exec_command</span><span class="p">(</span><span class="n">control</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">,</span> <span class="nb">NULL</span><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="tb"> </span><span class="n">ast_channel_lock</span><span class="p">(</span><span class="n">chan</span><span class="p">);</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="n">stasis_app_send_command_async</span><span class="p">(</span><span class="n">control</span><span class="p">,</span> <span class="n">bridge_channel_depart</span><span class="p">,</span> <span class="n">ast_channel_get_bridge_channel</span><span class="p">(</span><span class="n">chan</span><span class="p">));</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="n">ast_channel_unlock</span><span class="p">(</span><span class="n">chan</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;">You are locking too long. You only need to lock the channel for the ast_channel_get_bridge_channel() call not for the stasis_app_send_command_async() call.
You also should check the return value of stasis_app_send_command_async() because you will ref leak the bridge_channel.</pre>
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<p>- rmudgett</p>
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<p>On October 27th, 2013, 5:19 p.m. UTC, Joshua Colp wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By Joshua Colp.</div>
<p style="color: grey;"><i>Updated Oct. 27, 2013, 5:19 p.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-22703">ASTERISK-22703</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;">Currently within Stasis there is no guarantee that a channel that leaves a bridge will have ast_bridge_depart called on it. The attached change changes this by having a command queued on the channel that explicitly departs it when it leaves a bridge. This works for outside manipulation, bridge deletion, hangup, etc.
This fixes an issue that the referenced bug exposed. When hanging up while in a bridge no synchronization occurred between the bridge and stasis - causing both to act on a channel at the same time. Depending on how fast the stasis side executed it was possible for the channel itself to be freed and the bridge reference this freed memory.</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;">Deleted a bridge with a channel in it, confirmed with the patch that departure occurs and the bridge is destroyed.
Hungup while in a bridge, confirmed with the patch that departure occurs.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/12/res/stasis/control.c <span style="color: grey">(401922)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/2965/diff/" style="margin-left: 3em;">View Diff</a></p>
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