<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Recursive locking warning with Linux v3.19-8784-gb2b89ebfc0f0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89304">89304</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Recursive locking warning with Linux v3.19-8784-gb2b89ebfc0f0
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jwboyer@fedoraproject.org
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>We got the following lockdep report with Linux v3.19-8794-gb2b89ebfc0f0 (right
before 4.0-rc1). This might be optimus related?
[ INFO: possible recursive locking detected ]
3.20.0-0.rc0.git9.1.fc22.x86_64 #1 Not tainted
---------------------------------------------
Xorg/1484 is trying to acquire lock:
(&dev->struct_mutex){+.+.+.}, at: [<ffffffffa013fac9>]
i915_gem_unmap_dma_buf+0x39/0x110 [i915]
but task is already holding lock:
(&dev->struct_mutex){+.+.+.}, at: [<ffffffffa002eb12>]
drm_gem_object_handle_unreference_unlocked+0xc2/0x130 [drm]
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&dev->struct_mutex);
lock(&dev->struct_mutex);
*** DEADLOCK ***
May be due to missing lock nesting notation
1 lock held by Xorg/1484:
#0: (&dev->struct_mutex){+.+.+.}, at: [<ffffffffa002eb12>]
drm_gem_object_handle_unreference_unlocked+0xc2/0x130 [drm]
stack backtrace:
CPU: 0 PID: 1484 Comm: Xorg Not tainted 3.20.0-0.rc0.git9.1.fc22.x86_64 #1
Hardware name: ASUSTeK COMPUTER INC. U32VJ/U32VJ, BIOS U32VJ.201 08/29/2012
0000000000000000 000000002dfdbeed ffff8800b67779d8 ffffffff818773cd
0000000000000000 ffffffff82bdbaf0 ffff8800b6777ad8 ffffffff811091c9
00000000b6777ae8 ffff88012a003fc0 ffff880128f90000 0000000000000000
Call Trace:
[<ffffffff818773cd>] dump_stack+0x4c/0x65
[<ffffffff811091c9>] __lock_acquire+0x1bb9/0x1e20
[<ffffffff8102f6ef>] ? save_stack_trace+0x2f/0x50
[<ffffffff81109df7>] lock_acquire+0xc7/0x2a0
[<ffffffffa013fac9>] ? i915_gem_unmap_dma_buf+0x39/0x110 [i915]
[<ffffffff8187c02d>] mutex_lock_nested+0x7d/0x450
[<ffffffffa013fac9>] ? i915_gem_unmap_dma_buf+0x39/0x110 [i915]
[<ffffffffa013fac9>] ? i915_gem_unmap_dma_buf+0x39/0x110 [i915]
[<ffffffffa013fac9>] i915_gem_unmap_dma_buf+0x39/0x110 [i915]
[<ffffffff815ab2e5>] dma_buf_unmap_attachment+0x55/0x80
[<ffffffffa0049592>] drm_prime_gem_destroy+0x22/0x40 [drm]
[<ffffffffa0306461>] nouveau_gem_object_del+0x81/0xf0 [nouveau]
[<ffffffffa002e5b7>] drm_gem_object_free+0x27/0x40 [drm]
[<ffffffffa002eb30>] drm_gem_object_handle_unreference_unlocked+0xe0/0x130
[drm]
[<ffffffffa002ec51>] drm_gem_handle_delete+0xd1/0x150 [drm]
[<ffffffffa002f3c0>] drm_gem_close_ioctl+0x20/0x30 [drm]
[<ffffffffa002fdab>] drm_ioctl+0x1db/0x640 [drm]
[<ffffffff8110385f>] ? lock_release_holdtime.part.29+0xf/0x200
[<ffffffff811071ad>] ? trace_hardirqs_on_caller+0x13d/0x1e0
[<ffffffff8110725d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffffa02fdc62>] nouveau_drm_ioctl+0x72/0xd0 [nouveau]
[<ffffffff8128c9a8>] do_vfs_ioctl+0x2e8/0x530
[<ffffffff8128cc71>] SyS_ioctl+0x81/0xa0
[<ffffffff81880969>] system_call_fastpath+0x12/0x17
[1] <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1194742">https://bugzilla.redhat.com/show_bug.cgi?id=1194742</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>