[Bug 90053] New: Fatal server error: has_coherent_ptr:1532 assertion '!priv->cpu_bo->needs_flush' failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90053

            Bug ID: 90053
           Summary: Fatal server error: has_coherent_ptr:1532 assertion
                    '!priv->cpu_bo->needs_flush' failed
           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: christian.bugs at vonschultz.se
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115123
  --> https://bugs.freedesktop.org/attachment.cgi?id=115123&action=edit
journalctl /usr/bin/X --since='2015-04-08 13:09:53' --until='2015-04-08
13:12:29' _PID=502

* Problem: Intermittent X crash (assertion failed)
* Symptoms: X session terminates, gdm gives me a new login screen.

I'm not yet sure how trigger the crash. It has happened to me twice now, but I
haven't figured out what causes it or how to test for it.

* Error message in logs:
(EE) Backtrace:
(EE) 0: /usr/bin/Xorg (xorg_backtrace+0x48) [0x581ea8]
(EE) 1: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f5c8fcff000+0x56277)
[0x7f5c8fd55277]
(EE) 2: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f5c8fcff000+0x6eecf)
[0x7f5c8fd6decf]
(EE) 3: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f5c8fcff000+0x3e32c)
[0x7f5c8fd3d32c]
(EE) 4: /usr/lib64/xorg/modules/drivers/intel_drv.so (0x7f5c8fcff000+0x3e551)
[0x7f5c8fd3d551]
(EE) 5: /usr/bin/Xorg (0x400000+0x11190c) [0x51190c]
(EE) 6: /usr/bin/Xorg (0x400000+0x338cd) [0x4338cd]
(EE) 7: /usr/bin/Xorg (0x400000+0x373ee) [0x4373ee]
(EE) 8: /usr/bin/Xorg (0x400000+0x3b1eb) [0x43b1eb]
(EE) 9: /lib64/libc.so.6 (__libc_start_main+0xf5) [0x30e4621ad5]
(EE) 10: /usr/bin/Xorg (0x400000+0x2697e) [0x42697e]
(EE) Fatal server error:
(EE) has_coherent_ptr:1532 assertion '!priv->cpu_bo->needs_flush' failed

* Software involved:
X.Org X Server 1.17.1 (Release Date: 2015-02-10)
Distro: Gentoo.
Linux 3.18.11 (sys-kernel/gentoo-sources-3.18.11)

# equery list '*xorg*'
 * Searching for *xorg* ...
[IP-] [  ] x11-base/xorg-drivers-1.17:0
[IP-] [  ] x11-base/xorg-server-1.17.1-r1:0/1.17.1
[IP-] [  ] x11-base/xorg-x11-7.4-r2:0
[IP-] [  ] x11-misc/xorg-cf-files-1.0.5:0
# equery list 'x11-drivers/*'
 * Searching for * in x11-drivers ...
[IP-] [  ] x11-drivers/xf86-input-evdev-2.9.2:0
[IP-] [  ] x11-drivers/xf86-input-keyboard-1.8.0:0
[IP-] [  ] x11-drivers/xf86-input-mouse-1.9.1:0
[IP-] [  ] x11-drivers/xf86-input-synaptics-1.8.2:0
[IP-] [  ] x11-drivers/xf86-video-intel-2.99.917:0
[IP-] [  ] x11-drivers/xf86-video-nouveau-1.0.11:0

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