[Bug 73224] New: Xorg 1.15.0 segfaults on DPMS standby using Intel+SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73224

          Priority: medium
            Bug ID: 73224
          Assignee: chris at chris-wilson.co.uk
           Summary: Xorg 1.15.0 segfaults on DPMS standby using Intel+SNA
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: marti at juffo.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 91417
  --> https://bugs.freedesktop.org/attachment.cgi?id=91417&action=edit
Xorg log file with crash

Using up-to-date Arch Linux (testing), whenever my screens go into suspend, it
causes Xorg to crash with segfault. The bug is triggered immediately when
running 'xset dpms force standby'.

This also affects at least 2 other people, see the Arch Linux bug tracker:
https://bugs.archlinux.org/task/38335

I'm using xorg 1.15.0, xf86-video-intel 2.21.15, kernel 3.12.6, using Intel HD
4000 graphics on i5-3570K. According to the above bug report, xf86-video-intel
2.99.907 also has this problem.

lspci:
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen
Core processor Graphics Controller (rev 09)

Setting AccelMethod to uxa in Xorg configuration works around this problem:
https://wiki.archlinux.org/index.php/Intel_Graphics#Choose_acceleration_method

Until now I have been using Xorg 1.14.5 with SNA enabled, which does not have
this problem.

Excerpt from Xorg.0.log:
[ 17043.685] (EE) 
[ 17043.685] (EE) Backtrace:
[ 17043.685] (EE) 0: /usr/bin/Xorg (xorg_backtrace+0x48) [0x5834c8]
[ 17043.685] (EE) 1: /usr/bin/Xorg (0x400000+0x1871a9) [0x5871a9]
[ 17043.686] (EE) 2: /usr/lib/libpthread.so.0 (0x7fd20cdf2000+0xf870)
[0x7fd20ce01870]
[ 17043.686] (EE) 3: /usr/bin/Xorg (DamageUnregister+0x1e) [0x50de2e]
[ 17043.686] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fd208d78000+0x55d46) [0x7fd208dcdd46]
[ 17043.686] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fd208d78000+0x5b1bc) [0x7fd208dd31bc]
[ 17043.686] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so
(0x7fd208d78000+0x5c550) [0x7fd208dd4550]
[ 17043.686] (EE) 7: /usr/bin/Xorg (0x400000+0xa7197) [0x4a7197]
[ 17043.686] (EE) 8: /usr/bin/Xorg (0x400000+0xc4306) [0x4c4306]
[ 17043.686] (EE) 9: /usr/bin/Xorg (0x400000+0x107ef4) [0x507ef4]
[ 17043.686] (EE) 10: /usr/bin/Xorg (0x400000+0x109743) [0x509743]
[ 17043.686] (EE) 11: /usr/bin/Xorg (0x400000+0x39917) [0x439917]
[ 17043.686] (EE) 12: /usr/lib/libc.so.6 (__libc_start_main+0xf5)
[0x7fd20bc68b05]
[ 17043.686] (EE) 13: /usr/bin/Xorg (0x400000+0x24dae) [0x424dae]
[ 17043.686] (EE) 
[ 17043.686] (EE) Segmentation fault at address 0x1000000010
[ 17043.686] (EE) 
Fatal server error:
[ 17043.686] (EE) Caught signal 11 (Segmentation fault). Server aborting


Full log attached.

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