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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - circular locking,"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105051">105051</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>circular locking,
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/other
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bugzilla@colorremedies.com
</td>
</tr></table>
<p>
<div>
<pre>4.16.0-0.rc0.git9.1.fc28.x86_64 which is "linux-next" git f9f1e414128e
[ 9.523799] switcheroo-cont/889 is trying to acquire lock:
[ 9.523799] (console_lock){+.+.}, at: [<000000002c1cc7fb>]
vga_switchto_stage2+0x93/0x130
[ 9.523806]
but task is already holding lock:
[ 9.523807] (vgasr_mutex){+.+.}, at: [<000000007e504e29>]
vga_switcheroo_debugfs_write+0x6b/0x360
[ 9.523810]
which lock already depends on the new lock.
[ 9.523810]
the existing dependency chain (in reverse order) is:
[ 9.523810]
-> #3 (vgasr_mutex){+.+.}:
[ 9.523812]
-> #2 (&helper->lock){+.+.}:
[ 9.523814]
-> #1 ((fb_notifier_list).rwsem){++++}:
[ 9.523816]
-> #0 (console_lock){+.+.}:
[ 9.523818]
other info that might help us debug this:
[ 9.523818] Chain exists of:
console_lock --> &helper->lock --> vgasr_mutex</pre>
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