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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/kcm?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>kcm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='add7c65ca426b7a37184dd3d2172394e23d585d6'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Andrei Vagin &lt;avagin@openvz.org&gt;</td><td class='right'>2017-01-04 19:28:14 -0800</td></tr>
<tr><th>committer</th><td>Eric W. Biederman &lt;ebiederm@xmission.com&gt;</td><td class='right'>2017-01-10 13:34:56 +1300</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/kcm?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>add7c65ca426b7a37184dd3d2172394e23d585d6</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/kcm?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>28b08b519540041b06ed0ab0b1c005076b932e8e</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/kcm?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>net/kcm</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/kcm?id=75422726b0f717d67db3283c2eb5bc14fa2619c5'>75422726b0f717d67db3283c2eb5bc14fa2619c5</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/kcm?id=add7c65ca426b7a37184dd3d2172394e23d585d6&amp;id2=75422726b0f717d67db3283c2eb5bc14fa2619c5'>diff</a>)</td></tr></table>
<div class='commit-subject'>pid: fix lockdep deadlock warning due to ucount_lock</div><div class='commit-msg'>=========================================================
[ INFO: possible irq lock inversion dependency detected ]
4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G        W
---------------------------------------------------------
swapper/1/0 just changed the state of lock:
 (&amp;(&amp;sighand-&gt;siglock)-&gt;rlock){-.....}, at: [&lt;ffffffffbd0a1bc6&gt;] __lock_task_sighand+0xb6/0x2c0
but this lock took another, HARDIRQ-unsafe lock in the past:
 (ucounts_lock){+.+...}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Chain exists of:                 &amp;(&amp;sighand-&gt;siglock)-&gt;rlock --&gt; &amp;(&amp;tty-&gt;ctrl_lock)-&gt;rlock --&gt; ucounts_lock
 Possible interrupt unsafe locking scenario:
       CPU0                    CPU1
       ----                    ----
  lock(ucounts_lock);
                               local_irq_disable();
                               lock(&amp;(&amp;sighand-&gt;siglock)-&gt;rlock);
                               lock(&amp;(&amp;tty-&gt;ctrl_lock)-&gt;rlock);
  &lt;Interrupt&gt;
    lock(&amp;(&amp;sighand-&gt;siglock)-&gt;rlock);

 *** DEADLOCK ***

This patch removes a dependency between rlock and ucount_lock.

Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces")
Cc: stable@vger.kernel.org
Signed-off-by: Andrei Vagin &lt;avagin@openvz.org&gt;
Acked-by: Al Viro &lt;viro@ZenIV.linux.org.uk&gt;
Signed-off-by: Eric W. Biederman &lt;ebiederm@xmission.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=add7c65ca426b7a37184dd3d2172394e23d585d6'>Diffstat</a> (limited to 'net/kcm')</div><table summary='diffstat' class='diffstat'>