[Bug 56474] New: 3D app segfaults on NV46

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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

          Priority: medium
            Bug ID: 56474
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: 3D app segfaults on NV46
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: 1o5g4r8o-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
          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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