[Bug 73439] New: Xorg 1.15.0 segfaults randomly in memset() from intel_drv.so

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73439

          Priority: medium
            Bug ID: 73439
          Assignee: chris at chris-wilson.co.uk
           Summary: Xorg 1.15.0 segfaults randomly in memset() from
                    intel_drv.so
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: marti at juffo.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

I have experienced this bug a few times after upgrading to Xorg 1.15.0, but no
idea about the cause. Sometimes it happens when the computer is locked,
sometimes when I'm using it.

I'm using up-to-date Arch Linux testing: xorg 1.15.0, xf86-video-intel
2.99.907, kernel 3.12.6, mesa 10.0.1 Intel HD 4000 graphics on i5-3570K. Gnome
Shell 3.10.2.1 desktop.

I found another report of this on openSUSE forums:
http://forums.opensuse.org/english/get-technical-help-here/applications/492955-13-1-gnome-logs-out-itself.html
(down currently, but here's a Google cached copy:
http://webcache.googleusercontent.com/search?hl=en&num=50&q=cache%3Ahttp%3A%2F%2Fforums.opensuse.org%2Fenglish%2Fget-technical-help-here%2Fapplications%2F492955-13-1-gnome-logs-out-itself.html
)

I caught this in gdb, but unfortunatley Arch doesn't ship debug symbols, so gdb
"bt full" doesn't provide any more info. Full Xorg.0.log is attached.

Backtrace:
0: /usr/bin/Xorg (xorg_backtrace+0x48) [0x5834c8]
1: /usr/bin/Xorg (0x400000+0x1871a9) [0x5871a9]
2: /usr/lib/libpthread.so.0 (0x7f99097fb000+0xf870) [0x7f990980a870]
3: /usr/lib/libc.so.6 (memset+0x54) [0x7f99086d47e4]
4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f99042b6000+0x3b84b)
[0x7f99042f184b]
5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f99042b6000+0x3e776)
[0x7f99042f4776]
6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f99042b6000+0x5a292)
[0x7f9904310292]
7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f99042b6000+0x5aa01)
[0x7f9904310a01]
8: /usr/bin/Xorg (0x400000+0x10f144) [0x50f144]
9: /usr/bin/Xorg (0x400000+0x10535a) [0x50535a]
10: /usr/bin/Xorg (0x400000+0x359fe) [0x4359fe]
11: /usr/bin/Xorg (0x400000+0x3980a) [0x43980a]
12: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7f9908671b05]
13: /usr/bin/Xorg (0x400000+0x24dae) [0x424dae]

Segmentation fault at address 0x7f990082c000

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