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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/4608/">https://reviewboard.asterisk.org/r/4608/</a>
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<p style="margin-top: 0;">On April 9th, 2015, 1:49 p.m. MDT, <b>Corey Farrell</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/4608/diff/1/?file=73836#file73836line358" style="color: black; font-weight: bold; text-decoration: underline;">branches/13/res/res_pjsip_phoneprov_provider.c</a>
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(Diff revision 1)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int users_apply_handler(void *obj, void *arg, int flags)</pre></td>
<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int users_apply_handler(struct phoneprov *pp)</pre></td>
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<th bgcolor="#e9eaa8" style="border-right: 1px solid #C0C0C0;" align="right"><font size="2">356</font></th>
<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">ao2_callback</span><span class="p">(</span><span class="n">users</span><span class="p">,</span> <span class="n">OBJ_MULTIPLE</span><span class="p">,</span> <span class="n">users_apply_handler</span><span class="p">,</span> <span class="n">sorcery</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">i</span> <span class="o">=</span> <span class="n">ao2_iterator_init</span><span class="p">(</span><span class="n">users</span><span class="p">,</span> <span class="mi">0</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; "></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">while</span> <span class="p">((</span><span class="n">pp</span> <span class="o">=</span> <span class="n">ao2_iterator_next</span><span class="p">(</span><span class="o">&</span><span class="n">i</span><span class="p">)))</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; "></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="tb"> </span><span class="n">users_apply_handler</span><span class="p">(</span><span class="n">pp</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; "></pre></td>
<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">360</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="n">ao2_ref</span><span class="p">(</span><span class="n">pp</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</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; "></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="p">}</span></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">362</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">ao2_iterator_destroy</span><span class="p">(</span><span class="o">&</span><span class="n">i</span><span class="p">);</span></pre></td>
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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;">To record our brief discussion about this change:
<coreyfarrell> gtjoseph: so one thing I don't see how using an ao2_iterator instead of ao2_callback in users_apply_handler makes it more straight forward..
<coreyfarrell> I don't want to hold up the fix, but that change doesn't make much sense to me
<gtjoseph> there's no worry about the callback return value, OBJ_NODATA, etc. Get the container and iterate over it. It also eliminates a lot of overhead in the ao2_traversal code.
<gtjoseph> unless the callback is controlling the traversal with it's return code, there's no point.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Actually, I think more people should use an ao2_iterator instead of ao2_callback when they can. That internal_ao2_traverse code is ugly. :)
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<p>- George</p>
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<p>On April 9th, 2015, 1:57 p.m. MDT, George Joseph wrote:</p>
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<div>Review request for Asterisk Developers and Corey Farrell.</div>
<div>By George Joseph.</div>
<p style="color: grey;"><i>Updated April 9, 2015, 1:57 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-24935">ASTERISK-24935</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;">res_pjsip_phoneprov_provider was leaking references to phoneprov objects due to a missing OBJ_NODATA in an ao2_callback in load_users(). Rather than adding the OBJ_NODATA, I changed load_users to use a more straightforward ao2_iterator. This plugged the leak but exposed an unload order issue between res_pjsip_phoneprov_provider, res_phoneprov and res_pjsip.
res_pjsip_phoneprov_provider unloads first, then res_phoneprov, then res_pjsip. Since res_pjsip_phoneprov_provider uses res_pjsip's sorcery instance, when it unloads, it's objects are still in the sorcery instance. When res_pjsip unloads, it destroys all its objects including res_pjsip_phoneprov_provider's. The phoneprov destructor then attempts to unregister the extension from res_phoneprov but because res_phoneprov is already cleaned up, its users container is gone and we get a FRACK.
Simple solution, check for the NULL users container before attempting to remove the entry. Duh.
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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;">Ran tests/res_phoneprov/res_phoneprov_provider. No leaks in res_pjsip_phoneprov_provider and no FRACKs.
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>branches/13/res/res_pjsip_phoneprov_provider.c <span style="color: grey">(434447)</span></li>
<li>branches/13/res/res_phoneprov.c <span style="color: grey">(434447)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/4608/diff/" style="margin-left: 3em;">View Diff</a></p>
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