[Bug 95045] New: Driver randomly hangs in sna_wait_vblank()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95045

            Bug ID: 95045
           Summary: Driver randomly hangs in sna_wait_vblank()
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: mikolaj at siedlarek.pl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 123102
  --> https://bugs.freedesktop.org/attachment.cgi?id=123102&action=edit
log from Xorg initialization

Machine: Apple MacBook Pro Retina 10.1
OS: Linux 4.5.1-1-ARCH #1 SMP PREEMPT x86_64 GNU/Linux
Graphics: Intel Corporation 3rd Gen Core processor Graphics Controller
[8086:0166] (rev 09)
Xorg Server: 1.18.3
Xorg Intel Driver: 2.99.917 (commit f2a4645)

Xorg randomly and permanently hangs in Intel driver using SNA on my machine,
with main thread eating up 100% of one CPU core. Couple of semi-random manual
breaks in a debugger show the driver spending all of this time in
sna_wait_vblank()
function.

Mouse cursor also freezes if that matters - I saw people posting this in their
bug reports.

I'm attaching:
- backtrace from GDB
- log from Xorg initialization (rest of the log was from libinput, so I cut it
out)

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