[Bug 105051] circular locking,
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Mon Feb 12 07:00:17 UTC 2018
https://bugs.freedesktop.org/show_bug.cgi?id=105051
Bug ID: 105051
Summary: circular locking,
Product: DRI
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/other
Assignee: dri-devel at lists.freedesktop.org
Reporter: bugzilla at colorremedies.com
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
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