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td[id="email-wrapper-inner"][class="thin"] > table { text-align: left !important; width: 100% !important; }
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<td id="email-title-avatar" rowspan="2" style="font-size: 13px; text-align: left; vertical-align: top; width: 48px; padding-right: 8px"> <img class="avatar" src="cid:avatar_925838d3d8b1f71935f30b314c925d64" border="0" height="48" width="48" style="-ms-interpolation-mode: bicubic; border-radius: 3px" /> </td>
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<a href=" https://wiki.asterisk.org/wiki/display/~rnewton " style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Rusty Newton</a> edited the page:
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<td valign="top" style="font-size: 13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height: 20px; margin: 0; padding: 0"> <a href="https://wiki.asterisk.org/wiki/display/AST/Reference+Count+Debugging" style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:page-icon" alt="" style="border: 0; padding: 0 5px 0 0; text-align: left; vertical-align: middle" /> <strong style="font-size:16px;line-height:20px;vertical-align:top;">Reference Count Debugging</strong> </a> </h2> </td>
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<p class="aui-message info" style="font-size: 13px; margin: 1em 0; padding: 8px; background-color: #e0f0ff; border: 1px solid #9eb6d4"> <b>Comment:</b> Updated notes on refcounter caveat </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4252/6ac85e9b14675c5514a674e1aecae99c9505ed36.48/_/images/icons/macrobrowser/dropdown/toc.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Table of Contents</span></th>
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<p style="font-size: 13px"></p>
<h1 id="ReferenceCountDebugging-EnablingReferenceCountLogs" class="diff-block-context">Enabling Reference Count Logs</h1>
<p class="diff-context-placeholder" style="font-size: 13px">...</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4252/6ac85e9b14675c5514a674e1aecae99c9505ed36.48/_/images/icons/macrobrowser/dropdown/note.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Note</th>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">NOTICE</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <p style="font-size: 13px">This procedure assumes that you will be enabling reference count debugging in <code style="font-size: 13px">chan_sip</code>. Other modules may differ slightly.</p> </td>
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<li style="font-size: 13px"> <p style="font-size: 13px"> <span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">Locate the include directive for </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">asterisk.h</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;"> in your module and the definition of the </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">ASTERISK_FILE_VERSION</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;">.</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4252/6ac85e9b14675c5514a674e1aecae99c9505ed36.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">C</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">
</span>#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: XXXXXX $")
</pre> </td>
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<li style="font-size: 13px"> <p style="font-size: 13px"> <span class="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;">After the include directive for </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">asterisk.h</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;">, </span><strong><span class="diff-html-changed" style="background-color: #d6f0ff;">but before</span></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> the inclusion of </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">astobj2.h</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;">, insert the following:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">C</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">
</span>#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: XXXXXX $")
/* INSERTED */
#define REF_DEBUG 1
/* END INSERTED */
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<li style="font-size: 13px"> <p style="font-size: 13px"> <span class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">Note that </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">chan_sip</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;"> already has a comment denoting the proper place to define </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">REF_DEBUG</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;">. This will look something like the following:</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">C</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-2" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">
</span>#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$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"
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<li style="font-size: 13px"> <p style="font-size: 13px"> <span class="diff-html-changed" id="changed-diff-7" style="background-color: #d6f0ff;">For </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">chan_sip</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;"> specifically you'll need to also enable </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">REF_DEBUG</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;"> within the </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">channels/sip/security_events.c</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;"> file</span> </p>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">C</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">
</span>#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 384003 $")
#define REF_DEBUG 1
#include "include/sip.h"
</pre> </td>
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<li style="font-size: 13px">Re-compile Asterisk and re-install. Assuming the account Asterisk runs under has sufficient permissions to write to the <code style="font-size: 13px">/tmp</code> folder, a <code style="font-size: 13px">/tmp/refs</code> file should be created containing the reference counts for <code style="font-size: 13px">chan_sip</code>.</li>
</ol>
<p class="diff-context-placeholder" style="font-size: 13px">...</p>
<ol class="diff-block-target">
<li style="font-size: 13px">Open <code style="font-size: 13px">astobj2.h</code> in <code style="font-size: 13px">include/asterisk</code>.</li>
<li style="font-size: 13px"> <p style="font-size: 13px"> <span class="diff-html-changed" id="changed-diff-9" style="background-color: #d6f0ff;">Locate the header guard definition for the header file. Below it, define the </span><code style="font-size: 13px"><span class="diff-html-changed" style="background-color: #d6f0ff;">REF_DEBUG</span></code><span class="diff-html-changed" style="background-color: #d6f0ff;"> option.</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4252/6ac85e9b14675c5514a674e1aecae99c9505ed36.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; font-size: 13px">C</td>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">
</span>#ifndef _ASTERISK_ASTOBJ2_H
#define _ASTERISK_ASTOBJ2_H
#undef REF_DEBUG
#define REF_DEBUG 1
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<li style="font-size: 13px">Re-compile Asterisk and re-install. Assuming the account Asterisk runs under has sufficient permissions to write to the <code style="font-size: 13px">/tmp</code> folder, a <code style="font-size: 13px">/tmp/refs</code> file should be created containing the reference counts for all modules in Asterisk.</li>
</ol>
<p class="diff-context-placeholder" style="font-size: 13px">...</p>
<p class="diff-block-context" style="font-size: 13px">Each change in the reference count value of an <code style="font-size: 13px">ao2</code> object will generate at least one line of output in <code style="font-size: 13px">/tmp/refs</code>. This will look something like the following:</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4252/6ac85e9b14675c5514a674e1aecae99c9505ed36.48/_/images/icons/macrobrowser/dropdown/noformat.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>No Format</th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">
</span>...
0x8756f00 =1 chan_sip.c:22240:load_module (allocate users)
0x86e3408 =1 chan_sip.c:22241:load_module (allocate peers)
0x86dd380 =1 chan_sip.c:22242:load_module (allocate peers_by_ip)
0x822d020 =1 chan_sip.c:22243:load_module (allocate dialogs)
0x8930fd8 =1 chan_sip.c:20025:build_peer (allocate a peer struct)
0x8930fd8 +1 chan_sip.c:21467:reload_config (link peer into peer table) [@1]
0x8930fd8 -1 chan_sip.c:2370:unref_peer (unref_peer: from reload_config) [@2]
0x89318b0 =1 chan_sip.c:20025:build_peer (allocate a peer struct)
0x89318b0 +1 chan_sip.c:21467:reload_config (link peer into peer table) [@1]
0x89318b0 -1 chan_sip.c:2370:unref_peer (unref_peer: from reload_config) [@2]
0x8930218 =1 chan_sip.c:20025:build_peer (allocate a peer struct)
0x8930218 +1 chan_sip.c:21539:reload_config (link peer into peers table) [@1]
0x868c040 -1 chan_sip.c:2424:dialog_unlink_all (unset the relatedpeer->call field in tandem with relatedpeer field itself) [@2]
0x868c040 -1 chan_sip.c:2443:dialog_unlink_all (Let's unbump the count in the unlink so the poor pvt can disappear if it is time) [@1]
0x868c040 **call destructor** chan_sip.c:2443:dialog_unlink_all (Let's unbump the count in the unlink so the poor pvt can disappear if it is time)
0x8cc07e8 -1 chan_sip.c:2370:unref_peer (unsetting a dialog relatedpeer field in sip_destroy) [@3]
0x8cc07e8 +1 chan_sip.c:3876:find_peer (ao2_find in peers table) [@2]
0x8cc07e8 -1 chan_sip.c:2370:unref_peer (unref_peer, from sip_devicestate, release ref from find_peer) [@3]
...
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<ul class="diff-block-context">
<li style="font-size: 13px">The first column is the object address.</li>
<li style="font-size: 13px">The second column reflects how the operation affected the ref count for that object.
<ul>
<li style="font-size: 13px">Creation sets the ref count to 1 (=1).</li>
<li style="font-size: 13px">Increment or decrement and the amount are specified by (-1/+1).</li>
<li style="font-size: 13px">The *<strong>call destructor</strong>* is specified by the <code style="font-size: 13px">astobj2</code> API itself when the destroy routine is run for an object. It does not affect the ref count, but is important in debugging.</li>
</ul> </li>
<li style="font-size: 13px">The third column specifies where in a given file the reference count change was made, the function name, and - if applicable - a descriptive tag supplied in the function call.</li>
<li style="font-size: 13px">If the reference count changed, the previous reference count is appended to the end of the line, e.g., <code style="font-size: 13px">[@1]</code> indicates that the previous reference count was 1.</li>
</ul>
<h2 id="ReferenceCountDebugging-Usingrefcountertointerpretoutput" class="diff-block-target"> <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Using refcounter to interpret output</span> </h2>
<p class="diff-block-target diff-block-context" style="font-size: 13px">When you have a generated <code style="font-size: 13px">/tmp/refs</code> file, you can "<code style="font-size: 13px">sort -s -k 1 /tmp/refs > x1</code>" to get a sorted list of all the objects, or you can use "<strong><span class="diff-html-changed" id="changed-diff-11" style="background-color: #d6f0ff;">utils/refcounter</span></strong>" application provided with Asterisk to scan the file for you and output any problems it finds.</p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;; font-size: 13px"><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4252/6ac85e9b14675c5514a674e1aecae99c9505ed36.48/_/images/icons/macrobrowser/dropdown/warning.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Warning</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px"> <p style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">The refcounter generates lifetime chains for all ao2 objects and unless you have ref_debug enabled globally throughout Asterisk, refcounter will likely have false positives.</span> </p> </td>
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