[Mesa-dev] memory stomping/other error in a3ed98f7aa (gallium: new, unified pipe_context::set_sampler_views() function)

Ilia Mirkin imirkin at alum.mit.edu
Thu Nov 28 01:38:39 PST 2013

Hi Brian,

I've just completed a bisect which pointed out a3ed98f7aa (gallium:
new, unified pipe_context::set_sampler_views() function) as the bad

Starting with that commit, I see things like

*** glibc detected *** glretrace: corrupted double-linked list:
0x00000000016632f0 ***

but it can also be

*** glibc detected *** glretrace: free(): invalid pointer:
0x0000000001cb0130 ***

and also plain ol' segfaults. I'm on a nv98 card, using the nv50
driver. I had to manually patch it with the equivalent of c1345720c866
(except I just hard-coded it to 16) in order to avoid the assert.
However I also get segfaults with llvmpipe. I'm using gcc-4.7.3 in
case it matters.

My reproducer is running glretrace on the portal.trace file that you
can obtain from https://bugs.freedesktop.org/show_bug.cgi?id=64323#c1.
I was not able to repro using random other traces I had sitting
around, so I'm guessing something in that trace is triggering the
erring functionality. The crashes always happen in
dri_destroy_context/st_destroy_context, but that doesn't mean that
trouble doesn't happen earlier on.

Any ideas?


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