[Bug 90968] New: sigsegv from "sna/dri2: Mark the pending backbuffer copy as active"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90968

            Bug ID: 90968
           Summary: sigsegv from "sna/dri2: Mark the pending backbuffer
                    copy as active"
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: andreas.reis at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Said bisected commit causes consistent crashes eg. when Steam loads its main
window:

[   394.049] (EE) Backtrace:
[   394.049] (EE) 0: /usr/bin/xorg-server/Xorg (OsLookupColor+0x139) [0x5f22a9]
[   394.050] (EE) 1: /usr/lib/libc.so.6 (killpg+0x40) [0x7f28e1c095ef]
[   394.050] (EE) 2: /usr/lib/xorg/modules/drivers/intel_drv.so
(chain_swap+0x95) [0x7f28dbec1265]
[   394.050] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so
(sna_dri2_vblank_handler+0x259) [0x7f28dbec2ee9]
[   394.050] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so
(sna_mode_wakeup+0x195) [0x7f28dbe10e05]
[   394.051] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so
(sna_wakeup_handler+0xb0) [0x7f28dbe15270]
[   394.051] (EE) 6: /usr/bin/xorg-server/Xorg (WakeupHandler+0xaa) [0x4427fa]
[   394.051] (EE) 7: /usr/bin/xorg-server/Xorg (WaitForSomething+0x36e)
[0x5e904e]
[   394.051] (EE) 8: /usr/bin/xorg-server/Xorg (SendErrorToClient+0x114)
[0x43c054]
[   394.051] (EE) 9: /usr/bin/xorg-server/Xorg (remove_fs_handlers+0x414)
[0x441c04]
[   394.051] (EE) 10: /usr/lib/libc.so.6 (__libc_start_main+0xf0)
[0x7f28e1bf6790]
[   394.051] (EE) 11: /usr/bin/xorg-server/Xorg (_start+0x29) [0x427489]

4770, git versions & drm-intel-nightly

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