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* [Bug 105051] circular locking,
@ 2018-02-12  7:00 bugzilla-daemon
  2018-02-12  7:01 ` [Bug 105051] circular locking, switcheroo-cont/889 is trying to acquire lock vga_switchto_stage2, but vga_switcheroo_debugfs_write already has lock bugzilla-daemon
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: bugzilla-daemon @ 2018-02-12  7:00 UTC (permalink / raw)
  To: dri-devel


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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@lists.freedesktop.org
          Reporter: bugzilla@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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^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2019-10-14 13:20 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
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2018-02-12  7:00 [Bug 105051] circular locking, bugzilla-daemon
2018-02-12  7:01 ` [Bug 105051] circular locking, switcheroo-cont/889 is trying to acquire lock vga_switchto_stage2, but vga_switcheroo_debugfs_write already has lock bugzilla-daemon
2018-02-12  7:02 ` bugzilla-daemon
2018-02-12  7:02 ` bugzilla-daemon
2018-02-12  7:03 ` bugzilla-daemon
2018-02-12  7:03 ` bugzilla-daemon
2018-03-10  9:06 ` bugzilla-daemon
2019-10-14 13:20 ` bugzilla-daemon

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