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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~rnewton?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_925838d3d8b1f71935f30b314c925d64" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<td class="notification-comment-pattern-container mobile-resize-text" style="padding: 0px; border-collapse: collapse; padding: 0px"><strong>Change comment:</strong> headings were goofy.</td>
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<td id="page-title-pattern-icon-image-container-cell" style="padding: 0px; border-collapse: collapse; width: 16px; padding: 9px 8px 0px 0px; mso-text-raise: 5px; mso-line-height-rule: exactly"><a href="https://wiki.asterisk.org/wiki/display/AST/Reference+Count+Debugging?src=email" title="page icon" style="vertical-align: top;; color: #3b73af; text-decoration: none"><img style="vertical-align: top; display: block;" src="cid:page-icon" alt="page icon" title="page icon" height="16" width="16" border="0" /></a></td>
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/images/icons/macrobrowser/dropdown/column.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Column</th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <h1 id="ReferenceCountDebugging-Overview" style="margin: 10px 0 0 0; margin-top: 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 0">Overview</h1> <p style="margin: 10px 0 0 0">Asterisk makes extensive use of reference counted objects using the <code style="font-family: monospace">astobj2</code> API. In certain classes of bugs, the reference count for an object may get erroneously increased - leading to an object never getting reclaimed when its lifetime has ended - or decreased - leading (in the best case) to <code style="font-family: monospace">ERROR</code> messages being reported that a bad magic number has been detected or (in the worse case) invalid memory deallocation. Autodestruct warnings are another case that typically indicate a reference to a channel is still hanging around, preventing its destruction.</p> <p style="margin: 10px 0 0 0">In such cases, its often very useful to determine what in Asterisk manipulated the reference count on the object. The <code style="font-family: monospace">astobj2</code> API supports creating a reference count log for all objects managed by the API.</p> <p style="margin: 10px 0 0 0">In all cases, when providing the <strong>refs</strong> file to Asterisk developers for debugging purposes you should also be providing them with instructional steps, including configuration, that allows them to reproduce the issue consistently. See the <a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">Asterisk Issue Guidelines</a> for more details on submitting an issue.</p> <h1 id="ReferenceCountDebugging-EnablingReferenceCountLogs" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">Enabling Reference Count Logs</h1> <p style="margin: 10px 0 0 0"> <span style="font-size: 14.0px;line-height: 1.4285715;">An option is now available via </span><a class="confluence-link unresolved" href="#" style="color: #3b73af; text-decoration: none">menuselect</a><span style="font-size: 14.0px;line-height: 1.4285715;"> with the compiler flag </span><strong style="font-size: 14.0px;line-height: 1.4285715;">REF_DEBUG</strong><span style="font-size: 14.0px;line-height: 1.4285715;">, in versions 1.8.28, 11.10, 12.3.0, 13 or greater.</span> </p>
<ol style="margin: 10px 0 0 0">
<li>Recompile Asterisk with the REF_DEBUG compiler flag.</li>
<li>Re-install Asterisk.</li>
<li>Reproduce the issue for which you need reference count debug.</li>
<li>Provide bug marshals with the /var/log/asterisk/refs file generated during reproduction. That is, attach the <strong>refs</strong> file to your JIRA issue.</li>
</ol> <p style="margin: 10px 0 0 0">Unless instructed otherwise, this is all you need to do and you can ignore the rest of the instructions on this page.</p> <p style="margin: 10px 0 0 0"> </p> </td>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">On This Page</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"></p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/images/icons/macrobrowser/dropdown/toc.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Table of Contents</th>
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</table> <p class="diff-block-context" style="margin: 10px 0 0 0"> </p> <h1 id="ReferenceCountDebugging-ManuallyEnablingRefCountDebugging" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Manually </span><span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">Enabling </span> </h1> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <h1 id="ReferenceCountDebugging-ManuallyEnablingRefCountDebugging" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">Ref </span><span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">Count Debugging</span> </h1> <h2 id="ReferenceCountDebugging-EnablingforaSpecificModule" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0; margin-top: 10px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Enabling </span><span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">for a Specific Module</span> </h2> <p class="diff-block-context" style="margin: 10px 0 0 0"> <span>When enabling reference count debugging, you can either attempt to enable it for all users of the </span><code style="font-family: monospace">astobj2</code><span> API, or for individual files that use the </span><code style="font-family: monospace">astobj2</code><span> API. In general, its recommended that you only enable ref count debugging in the specific files that use the </span><code style="font-family: monospace">astobj2</code><span> API, as enabling it for all users will result in a very large </span><code style="font-family: monospace">/tmp/refs</code><span> file very quickly.</span> </p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p>
<ol class="diff-block-context" style="margin: 10px 0 0 0">
<li> <p style="margin: 10px 0 0 0; margin-top: 0">Locate the include directive for <code style="font-family: monospace">asterisk.h</code> in your module and the definition of the <code style="font-family: monospace">ASTERISK_FILE_VERSION</code>.</p>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: XXXXXX $")
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<li> <p style="margin: 10px 0 0 0; margin-top: 0">After the include directive for <code style="font-family: monospace">asterisk.h</code>, <strong>but before</strong> the inclusion of <code style="font-family: monospace">astobj2.h</code>, insert the following:</p>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: XXXXXX $")
/* INSERTED */
#define REF_DEBUG 1
/* END INSERTED */
</pre> </td>
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<li> <p style="margin: 10px 0 0 0; margin-top: 0">Note that <code style="font-family: monospace">chan_sip</code> already has a comment denoting the proper place to define <code style="font-family: monospace">REF_DEBUG</code>. This will look something like the following:</p>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 384827 $")
#include <signal.h>
#include <sys/signal.h>
#include <regex.h>
#include <inttypes.h>
#include "asterisk/network.h"
#include "asterisk/paths.h" /* need ast_config_AST_SYSTEM_NAME */
/*
Uncomment the define below, if you are having refcount related memory leaks.
With this uncommented, this module will generate a file, /tmp/refs, which contains
a history of the ao2_ref() calls. To be useful, all calls to ao2_* functions should
be modified to ao2_t_* calls, and include a tag describing what is happening with
enough detail, to make pairing up a reference count increment with its corresponding decrement.
The refcounter program in utils/ can be invaluable in highlighting objects that are not
balanced, along with the complete history for that object.
In normal operation, the macros defined will throw away the tags, so they do not
affect the speed of the program at all. They can be considered to be documentation.
Note: This must also be enabled in channels/sip/security_events.c
*/
#define REF_DEBUG 1
#include "asterisk/lock.h"
</pre> </td>
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<li> <p style="margin: 10px 0 0 0; margin-top: 0">For <code style="font-family: monospace">chan_sip</code> specifically you'll need to also enable <code style="font-family: monospace">REF_DEBUG</code> within the <code style="font-family: monospace">channels/sip/security_events.c</code> file</p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">C</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 384003 $")
#define REF_DEBUG 1
#include "include/sip.h"
</pre> </td>
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<li>Re-compile Asterisk and re-install. Assuming the account Asterisk runs under has sufficient permissions to write to the <code style="font-family: monospace">/tmp</code> folder, a <code style="font-family: monospace">/tmp/refs</code> file should be created containing the reference counts for <code style="font-family: monospace">chan_sip</code>.</li>
</ol> <h2 id="ReferenceCountDebugging-EnablingforallModules" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;">Enabling </span> </h2> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <h2 id="ReferenceCountDebugging-EnablingforallModules" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">for all Modules</span> </h2>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">NOTICE</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0">This procedure assumes you want to track <strong>all</strong> reference counted objects in Asterisk. This is expensive and liable to create a very large reference counting log in <code style="font-family: monospace">/tmp/refs</code>.</p> </td>
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</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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