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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT BSW] lockdep splat in drm_gem_mmap"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94759">94759</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BAT BSW] lockdep splat in drm_gem_mmap
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (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>joonas.lahtinen@linux.intel.com
</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>Created <span class=""><a href="attachment.cgi?id=122637" name="attach_122637" title="dmesg from I-G-T run">attachment 122637</a> <a href="attachment.cgi?id=122637&action=edit" title="dmesg from I-G-T run">[details]</a></span>
dmesg from I-G-T run
At:
/archive/results/CI_IGT_test/Patchwork_1712/bsw-nuc-2/html/bsw-nuc-2@Patchwork_1712@1/igt@<a href="mailto:gem_exec_basic@gtt-blt.html">gem_exec_basic@gtt-blt.html</a>
Log beginning (full log attached):
[ 149.921578] ======================================================
[ 149.921640] [ INFO: possible circular locking dependency detected ]
[ 149.921703] 4.5.0-gfxbench+ #1 Not tainted
[ 149.921745] -------------------------------------------------------
[ 149.921807] gem_exec_basic/5896 is trying to acquire lock:
[ 149.921861] (&dev->struct_mutex){+.+.+.}, at: [<ffffffff81514ea1>]
drm_gem_mmap+0x1a1/0x270
[ 149.921969]
but task is already holding lock:
[ 149.922027] (&mm->mmap_sem){++++++}, at: [<ffffffff8117d8c4>]
vm_mmap_pgoff+0x44/0xa0
[ 149.922125]
which lock already depends on the new lock.</pre>
</div>
</p>
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