Nouveau - May 2012 - [Bug 49815] New: nouveau segfaults in p_atomic_dec_zero

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

--- Comment #1 from Alen Skondro <askondro at gmail.com> 2012-05-11
13:10:40 UTC ---
Forgot to add the latest commit I'm using...

23c0d469e55b3cb79ad4b2fd0d961562a26234fd

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

--- Comment #2 from andrew.green.df at gmail.com 2012-05-15 20:54:15 PDT ---
Looks like I've been bitten by the same bug, or something similar. 
Everything was working fine until I pulled in the latest mesa from git 
and recompiled. Then gnome started going only into fallback mode. In 
dmesg I was getting:
gnome-session-c[3618]: segfault at 100010001 ip 00007f0419ae0570 sp 
00007fffd3204870 error 6 in nouveau_dri.so[7f0419a64000+495000]

When in fallback mode, if I ran glxinfo it would also segfault:
glxinfo[3729]: segfault at 100010001 ip 00007ffe31f49570 sp 
00007fff22a85df0 error 6 in nouveau_dri.so[7ffe31ecd000+495000]

Going back to commit b328949a37fee7b0f68ed3e068ffc4426c083042 fixed it.

I'm afraid I have no backtrace but if someone can point me to some quick 
instructions I should be able to try to get one in a few days.

Here is what lspci says my card is:
01:00.0 VGA compatible controller: NVIDIA Corporation G86M [Quadro NVS 
135M] (rev a1)

I'm using a very mixed Debian testing/unstable/experimental, kernel 
3.2.0-2, amd64, on a Dell Latitude D630 laptop.

(BTW, nouveau works moderately well on my box. I can run Gnome 3 but the 
zoom animations look like crap, maybe because the card stays in 
low-power mode. (I used to run the nvidia blob with Compiz, and I had to 
deactivate power saving to get good animations then.) After about 20-30 
hours of use I usually get some kind of memory corruption, or X locks 
up, and I have to reboot. However, the 2d acceleration rocks, much 
faster than the blob! Makes it worth it.)

Anyway, thanks to everyone for your great work! Greetings,
Andrew

El 11/05/12 08:10, bugzilla-daemon at freedesktop.org
escribi?:
> https://bugs.freedesktop.org/show_bug.cgi?id=49815
>
> --- Comment #1 from Alen Skondro<askondro at gmail.com>  2012-05-11
13:10:40 UTC ---
> Forgot to add the latest commit I'm using...
>
> 23c0d469e55b3cb79ad4b2fd0d961562a26234fd
>
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https://bugs.freedesktop.org/show_bug.cgi?id=49815

Alen Skondro <askondro at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Alen Skondro <askondro at gmail.com> 2012-05-23
02:45:13 PDT ---
With latest git, this works for me again.

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