[Bug 58814] New: [IVB] segfault after client disconnect with TearFree

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58814

          Priority: medium
            Bug ID: 58814
          Assignee: chris at chris-wilson.co.uk
           Summary: [IVB] segfault after client disconnect with TearFree
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: xlinuxro at yahoo.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 72196
  --> https://bugs.freedesktop.org/attachment.cgi?id=72196&action=edit
stacktrace from the crash

Reproduction steps:
  enable sna & TearFree
  start Xorg in gdb on an empty VT
  start xterm on the new display (no window manager)
  start glxgears from the xterm
  use ctrl-c in the xterm to abort glxgears
  continue relaunching and aborting glxgears until Xorg crashes.

I am attaching a couple of gdb generated stacktraces obtained using those
steps.  The crash also occurs in a normal X session but I don't have a log for
that.  Also it does not happen if TearFree is disabled.

This was observed while using the following versions:
  xserver:    1.13.99.901
  xf86-video-intel: 2.20.16-48-g52fd223
  libdrm: 2.4.40-3-g0980633

$ uname -a
Linux namdle 3.8.0-rc1-namdle+ #1 SMP Fri Dec 21 22:46:59 EST 2012 x86_64
GNU/Linux

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