[Bug 81645] New: crash in the cursor code

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81645

          Priority: medium
            Bug ID: 81645
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: crash in the cursor code
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: debian at delanoe.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

On Debian Jessie,freeze noticed with such logs in dmesg:

[54320.265767] CPU: 0 PID: 829 Comm: Xorg Tainted: P        W  O 3.14-1-amd64
#1 Debian 3.14.12-1
[54320.265768] Hardware name: Apple Inc. MacBookAir6,1/Mac-35C1E88140C3E6CF,
BIOS MBA61.88Z.0099.B09.1402071141 02/07/2014
[54320.265769]  0000000000000009 ffffffff814ba733 ffff88026519dc98
ffffffff8105f032
[54320.265770]  ffff880263518028 ffff88026519dce8 0000000000070084
0000000000000292
[54320.265772]  0000000000000000 ffffffff8105f097 ffffffffa0948a74
ffff880200000018
[54320.265773] Call Trace:
[54320.265775]  [<ffffffff814ba733>] ? dump_stack+0x41/0x51
[54320.265777]  [<ffffffff8105f032>] ? warn_slowpath_common+0x72/0x90
[54320.265778]  [<ffffffff8105f097>] ? warn_slowpath_fmt+0x47/0x50
[54320.265784]  [<ffffffffa091b0ab>] ? hsw_write32+0x4b/0x150 [i915]
[54320.265789]  [<ffffffffa091c428>] ? gen6_read32+0x48/0x120 [i915]
[54320.265794]  [<ffffffffa08d8a4d>] ? intel_crtc_update_cursor+0x29d/0x3f0
[i915]
[54320.265799]  [<ffffffffa08dbb10>] ? intel_crtc_cursor_move+0x50/0x60 [i915]
[54320.265804]  [<ffffffffa031605f>] ? drm_mode_cursor_common+0x8f/0x160 [drm]
[54320.265809]  [<ffffffffa0319c9f>] ? drm_mode_cursor_ioctl+0x3f/0x50 [drm]
[54320.265812]  [<ffffffffa030b89d>] ? drm_ioctl+0x42d/0x530 [drm]
[54320.265816]  [<ffffffffa02fec30>] ? evdev_read+0xd0/0x2f0 [evdev]
[54320.265818]  [<ffffffff81197e9f>] ? do_vfs_ioctl+0x2cf/0x4b0
[54320.265820]  [<ffffffff81185e21>] ? vfs_read+0x91/0x160
[54320.265822]  [<ffffffff811980f9>] ? SyS_ioctl+0x79/0x90
[54320.265823]  [<ffffffff814c80b9>] ? system_call_fastpath+0x16/0x1b
[54320.265824] ---[ end trace 77f62fde486db570 ]---
[54320.265827] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register
before writing to 70084
[54320.265828] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70084

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