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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line405" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 5)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_channel *agent_lock_all(struct agent_pvt *pvt)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">owner</span> <span class="o">!=</span> <span class="n">pvt</span><span class="o">-></span><span class="n">owner</span><span class="p">)</span> <span class="p">{</span> <span class="cm">/* Channel changed. Unref and do another pass. */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">owner</span> <span class="o">=</span> <span class="n">ast_channel_unref</span><span class="p">(</span><span class="n">owner</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 also need to unlock owner in this if block.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line973" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 5)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_hangup(struct ast_channel *ast)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_channel_<span class="hl">lock</span></span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</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="n"><span class="hl">indicate_chan</span></span><span class="hl"> </span><span class="o"><span class="hl">=</span></span><span class="hl"> </span><span class="n">ast_channel_<span class="hl">ref</span></span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</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_indicate_data</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">chan</span><span class="p">,</span> <span class="n">AST_CONTROL_HOLD</span><span class="p">,</span><span class="ew"> </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">S_OR</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">moh</span><span class="p">,</span> <span class="nb">NULL</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; "></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">ast_strlen_zero</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">moh</span><span class="p">)</span> <span class="o">?</span> <span class="n">strlen</span><span class="p">(</span><span class="n">p</span><span class="o">-></span><span class="n">moh</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span> <span class="o">:</span> <span class="mi">0</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">p</span><span class="o">-></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 should copy p->moh into a local buffer while you have p locked.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1579" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int action_agents(struct mansession *s, const struct message *m)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">owner</span> <span class="o">=</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;">No need to initialize to NULL here.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1655" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_logoff(const char *agent, int soft)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">owner</span> <span class="o">=</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;">Again, no need to initialize to NULL.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1657" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_logoff(const char *agent, int soft)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">agent_lock_all</span><span class="p">(</span><span class="n">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;">This should be "owner = agent_lock_all(p);"</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1663" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agent_logoff(const char *agent, int soft)</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_softhangup</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">AST_SOFTHANGUP_EXPLICIT</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_softhangup</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">AST_SOFTHANGUP_EXPLICIT</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;">Use "owner" here instead of "p->owner"</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1802" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1786</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">owner</span> <span class="o">=</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;">Another unnecessary initialization to NULL.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1804" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">1788</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">agent_lock_all</span><span class="p">(</span><span class="n">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;">This should be "owner = agent_lock_all(p);"</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1879" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show_online(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">owner</span> <span class="o">=</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;">Unnecessary initialization.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1883" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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(Diff revision 5)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show_online(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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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">1867</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">agent_lock_all</span><span class="p">(</span><span class="n">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;">Use "owner = agent_lock_all(p);"</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line1891" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static char *agents_show_online(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">1806</font></th>
<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">p</span><span class="o">-></span><span class="n">owner</span> <span class="o">&&</span> <span class="n">ast_bridged_channel</span><span class="p">(</span><span class="n"><span class="hl">p</span></span><span class="o"><span class="hl">-></span></span><span class="n">owner</span><span class="p">))</span><span class="ew"> </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">p</span><span class="o">-></span><span class="n">owner</span> <span class="o">&&</span> <span class="n">ast_bridged_channel</span><span class="p">(</span><span class="n">owner</span><span class="p">))</span> <span class="p"><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;">Use "owner" instead of "p->owner" here.</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line2476" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agents_data_provider_get(const struct ast_data_search *search,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">owner</span> <span class="o">=</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;">I think you know what I'm going to say by now...</pre>
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<a href="https://reviewboard.asterisk.org/r/1708/diff/5/?file=23882#file23882line2484" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_agent.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int agents_data_provider_get(const struct ast_data_search *search,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">agent_lock_all</span><span class="p">(</span><span class="n">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;">And here too...</pre>
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<p>- Mark</p>
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<p>On February 3rd, 2012, 11:52 a.m., jrose wrote:</p>
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<div>Review request for Asterisk Developers, Mark Michelson, rmudgett, and Matt Jordan.</div>
<div>By jrose.</div>
<p style="color: grey;"><i>Updated Feb. 3, 2012, 11:52 a.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;">Also adds locking to a number of other functions which are calling ast_bridged_channel (which is documented as requiring a lock for safe running, which was the purpose of irroot's original locking patch in action_agents.
Unlike the other patch on reviewboard right now, this opts to enforce locking order instead of using deadlock avoidance.
Celebrity endorsement: "This looks incredibly sane to me." - MMichelson</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;">Not much I'm afraid to say. I can't reproduce the issue since it involves real world use over a period of time. I'll ask Alex Villacís Lasso to give it a shot though.</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-19285">ASTERISK-19285</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_agent.c <span style="color: grey">(353685)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1708/diff/" style="margin-left: 3em;">View Diff</a></p>
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