Nouveau - Oct 2012 - [Bug 56474] New: 3D app segfaults on NV46

https://bugs.freedesktop.org/show_bug.cgi?id=56474

          Priority: medium
            Bug ID: 56474
          Assignee: nouveau at lists.freedesktop.org
           Summary: 3D app segfaults on NV46
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: 1o5g4r8o at gmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: 9.0
         Component: Drivers/DRI/nouveau
           Product: Mesa

Created attachment 69169
  --> https://bugs.freedesktop.org/attachment.cgi?id=69169&action=edit
dmesg

Debian Wheezy i386
Mesa 9.0-1
libdrm 2.4.39-1
xserver-xorg-video-nouveau 1.0.3
Attached dmesg.

supertuxkart segfaults on Debian. Attached backtrace.

21:16 < joi> try: "up; print res"
21:17 < gg0> (gdb) up
21:17 < gg0> #1  nv30_vbo_validate (nv30=0x94c2658) at nv30_vbo.c:239
21:17 < gg0> 239I      PUSH_RESRC(push, NV30_3D(VTXBUF(i)), user ? 
             BUFCTX_VTXTMP : BUFCTX_VTXBUF,
21:17 < gg0> (gdb) print res
21:17 < gg0> $4 = (struct nv04_resource *) 0x0

21:35 < joi> gg0: try this one: http://bpaste.net/show/54017/

diff --git a/src/gallium/drivers/nv30/nv30_vbo.c
b/src/gallium/drivers/nv30/nv30_vbo.c
index 128457f..94febc3 100644
--- a/src/gallium/drivers/nv30/nv30_vbo.c
+++ b/src/gallium/drivers/nv30/nv30_vbo.c
@@ -226,6 +226,8 @@ nv30_vbo_validate(struct nv30_context *nv30)
       user = (nv30->vbo_user & (1 << ve->vertex_buffer_index));

       res = nv04_resource(vb->buffer);
+      if (!res)
+         continue;

       if (nv30->vbo_fifo || unlikely(vb->stride == 0)) {
          if (!nv30->vbo_fifo)

With patch above, stk doesn't produce core anymore and Xorg freezes.

So far, mesa 8 is better. I could use it even if often it crashes during kart
races. With mesa 9, races can't even start.

Further backtraces and system info available at http://bugs.debian.org/691292
Bug describes how it behaves on current Debian wheezy, Mesa 8.

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https://bugs.freedesktop.org/show_bug.cgi?id=56474

--- Comment #1 from Gabriele Giacone <1o5g4r8o at gmail.com> ---
Created attachment 69170
  --> https://bugs.freedesktop.org/attachment.cgi?id=69170&action=edit
supertuxkart backtrace

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https://bugs.freedesktop.org/show_bug.cgi?id=56474

--- Comment #2 from Gabriele Giacone <1o5g4r8o at gmail.com> ---
22:34 < joi> gg0: does it work if you set NV30_SWTNL env var?
22:39 < gg0> joi: it started but seems stuck and it's taking 100% cpu
22:47 < joi> if I understand this code correctly, only SWTNL path handles 
             user buffers, so... someone needs to implement user buffers in 
             hw path or fix sw path (which is disabled by default and 
             probably broken)

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https://bugs.freedesktop.org/show_bug.cgi?id=56474

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|3D app segfaults on NV46    |[NV30 gallium] supertuxkart
                   |                            |segfaults on NV46

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

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

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
The crash appears to be gone with mesa git, tested on NV42 and NV44. (There
_was_ a nasty little issue with the fragment shaders, but that's fixed in
mesa
git now.) Feel free to reopen if this still doesn't work for you.

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