[Bug 85077] New: Segfault in brw_misc_state

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85077

            Bug ID: 85077
           Summary: Segfault in brw_misc_state
           Product: Mesa
           Version: 10.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: kenny at kennypearce.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 107907
  --> https://bugs.freedesktop.org/attachment.cgi?id=107907&action=edit
Xorg.0.log

On Debian unstable, I get a segfault in the i965 mesa driver. This causes a
large number of applications to fail, including anything that uses the webcam.
The glxgears test program segfaults on startup. The stack trace from the core
file is as follows:

#0  get_stencil_miptree (irb=<optimized out>)
    at ../../../../../../../src/mesa/drivers/dri/i965/brw_misc_state.c:225
225    ../../../../../../../src/mesa/drivers/dri/i965/brw_misc_state.c: No such
file or directory.
(gdb) where
#0  get_stencil_miptree (irb=<optimized out>)
    at ../../../../../../../src/mesa/drivers/dri/i965/brw_misc_state.c:225
#1  brw_workaround_depthstencil_alignment (brw=0x7fafe0819038, 
    clear_mask=clear_mask at entry=18)
    at ../../../../../../../src/mesa/drivers/dri/i965/brw_misc_state.c:241
#2  0x00007fafdb37e152 in brw_clear (ctx=0x7fafe0819038, mask=18)
    at ../../../../../../../src/mesa/drivers/dri/i965/brw_clear.c:235
#3  0x000000000040255e in ?? ()
#4  0x0000000000401d54 in ?? ()
#5  0x00007fafdf2b0b45 in __libc_start_main (main=0x4018d0, argc=1, 
    argv=0x7fff7a5b2628, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fff7a5b2618) at libc-start.c:287
#6  0x0000000000402332 in ?? ()



Before crashing, glxgears prints the following:
"Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate." The glxgears window never
appears.

I am on a Dell Inspiron laptop. The crash occurs regardless of whether my VGA
external monitor is attached.

I am on kernel 3.16-2-amd64. I have observed the problem with mesa versions
10.2.8-1, 10.3.0-2, and 10.3.1-1.

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