[Bug 61628] [ilk] Corrupted rendering of page previews in Firefox with >xf86-video-intel-2.20.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61628

--- Comment #29 from Coacher <itumaykin at gmail.com> ---
(In reply to comment #28)
> If you can keep running with that patch
> and with --enable-debug to check if any assertions are triggered and see how
> things progress.

OK, I've did what you've said, powered on and started to watch Xorg.0.log.

The first thing I did was to open Firefox and trigger this issue several times
- no output.
Then I've tried to simulate some typical workflow i.e. opened programs I use on
a daily basis and do some things inside them like checking mail, browsing a
couple of webpages - still no output.
Then I've decided to close them and return to Firefox and again triggered this
issue several times and opened a couple of heavy tabs with flash and suddenly
caught this:

(EE) [mi] EQ overflowing.  Additional events will be discarded until existing
events are processed.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x34) [0x5969b4]
(EE) 1: /usr/bin/X (mieqEnqueue+0x263) [0x5776c3]
(EE) 2: /usr/bin/X (0x400000+0x4fcd4) [0x44fcd4]
(EE) 3: /usr/lib64/xorg/modules/input/evdev_drv.so (0x7f236e1d0000+0x6208)
[0x7f236e1d6208]
(EE) 4: /usr/bin/X (0x400000+0x7a477) [0x47a477]
(EE) 5: /usr/bin/X (0x400000+0xa5527) [0x4a5527]
(EE) 6: /lib64/libpthread.so.0 (0x3a9c400000+0x10bf0) [0x3a9c410bf0]
(EE) 7: /lib64/libc.so.6 (ioctl+0x7) [0x3a9bce3437]
(EE) 8: /usr/lib64/libdrm.so.2 (drmIoctl+0x28) [0x3fd3c040d8]
(EE) 9: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f236fd9c000+0x1c1a0)
[0x7f236fdb81a0]
(EE) 10: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f236fd9c000+0x1d9f7)
[0x7f236fdb99f7]
(EE) 11: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f236fd9c000+0x4fe3a)
[0x7f236fdebe3a]
(EE) 12: /usr/bin/X (BlockHandler+0x44) [0x43f224]
(EE) 13: /usr/bin/X (WaitForSomething+0x11d) [0x593e7d]
(EE) 14: /usr/bin/X (0x400000+0x3ade2) [0x43ade2]
(EE) 15: /usr/bin/X (0x400000+0x29b5a) [0x429b5a]
(EE) 16: /lib64/libc.so.6 (__libc_start_main+0xed) [0x3a9bc2460d]
(EE) 17: /usr/bin/X (0x400000+0x29eb1) [0x429eb1]
(EE)
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up
the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
[  8739.251] [mi] Increasing EQ size to 512 to prevent dropped events.
[  8739.251] [mi] EQ processing has resumed after 64 dropped events.
[  8739.251] [mi] This may be caused my a misbehaving driver monopolizing the
server's resources.

After that I've tried to reproduce this trace again opening same tabs and
triggering issue again and again, but without any luck. Is this stack trace
useful in any way?

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