[Nouveau] [Bug 49815] New: nouveau segfaults in p_atomic_dec_zero

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49815

             Bug #: 49815
           Summary: nouveau segfaults in p_atomic_dec_zero
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: askondro at gmail.com


With latest mesa git (20120511) gnome starts in fallback mode only.

Last known working mesa was from yesterday.
I'm using kernel 3.4rc6 on arch linux.

=============================================================================

Core was generated by
`/usr/lib/gnome-session/gnome-session-check-accelerated-helper'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f4a758b1ffa in p_atomic_dec_zero (v=0x100010001) at
../../../../src/gallium/auxiliary/util/u_atomic.h:53
53       __asm__ __volatile__("lock; decl %0; sete %1":"+m"(*v), "=qm"(c)
(gdb) bt
#0  0x00007f4a758b1ffa in p_atomic_dec_zero (v=0x100010001) at
../../../../src/gallium/auxiliary/util/u_atomic.h:53
#1  0x00007f4a758b1f9a in pipe_reference_described (ptr=0x100010001,
reference=0x0, get_desc=0x7f4a75c66e90 <debug_describe_resource>)
    at ../../../../src/gallium/auxiliary/util/u_inlines.h:88
#2  0x00007f4a758b2065 in pipe_resource_reference (ptr=0xfeeae8, tex=0x0) at
../../../../src/gallium/auxiliary/util/u_inlines.h:121
#3  0x00007f4a758b142b in nv50_set_constant_buffer (pipe=0xfee5d0, shader=3,
index=0, cb=0x0) at nv50_state.c:761
#4  0x00007f4a75a97846 in st_destroy_context (st=0x1081550) at
state_tracker/st_context.c:291
#5  0x00007f4a75960add in st_context_destroy (stctxi=0x1081550) at
state_tracker/st_manager.c:596
#6  0x00007f4a75868a74 in dri_destroy_context (cPriv=0xfee590) at
dri_context.c:174
#7  0x00007f4a75861b4b in driDestroyContext (pcp=0xfee590) at
../../../../src/mesa/drivers/dri/common/dri_util.c:301
#8  0x00007f4a791147dd in dri2_destroy_context (context=0xfee3f0) at
dri2_glx.c:132
#9  0x00007f4a790cd4b2 in glXDestroyContext (dpy=0xf9a2d0, ctx=0xfee3f0) at
glxcmds.c:424

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