Package: mesa
Version: 7.11.2-1
Hello,
I tried to replace the memory allocator for a program
linked against mesa. With the libc allocators the app shows some
textured and shaded triangles, but with the custom allocators, it's all
black triangles. Sorry, I cannot post the program source as it is rather
large, but will try to come up with a minimal test if this is necessary.
The custom allocator returns NULL for zero-sized requests.
The problem goes away if I change the allocator to return some memory.
Symptoms:
all black triangles.
likely cause:
'calloc (nmemb=0, size=12)' in
st_translate_mesa_program at state_tracker/st_mesa_to_tgsi.c:1181
hardware:
[ 33.950374] [drm] nouveau 0000:01:00.0: Detected an NV30 generation
card (0x034200b1)
driver:
nouveau
gdb backtrace:
(gdb) backtrace
#0 alcAlloc (sz=0, alignment=1, res=false) at alc.c:351
#1 0xb7dee54c in calloc (nmemb=0, size=12) at alc.c:593
#2 0xb6d6384a in st_translate_mesa_program (ctx=0xb6916000, procType=0,
ureg=0xb560c000, program=0xb573f120,
numInputs=3, inputMapping=0xbff75768,
inputSemanticName=0xbff7580c "\001\001\005\265쉈\265\060\240t\267
\371\202\327\266\060\240t\267\230X\367\277\020{\216\266",
inputSemanticIndex=0xbff7582c "", interpMode=0xbff756e8, numOutputs=1,
outputMapping=0xbff757e0,
outputSemanticName=0xbff7584c "\001",
outputSemanticIndex=0xbff7586c "", passthrough_edgeflags=0 '\000')
at state_tracker/st_mesa_to_tgsi.c:1181
#3 0xb6ca3b1e in st_translate_fragment_program (st=0xb68e5380,
stfp=0xb573f120, key=0xbff758f8)
at state_tracker/st_program.c:609
#4 0xb6ca49d6 in st_get_fp_variant (st=0xb68e5380, stfp=0xb573f120,
key=0xbff758f8)
at state_tracker/st_program.c:667
#5 0xb6d52e37 in update_fp (st=0xb68e5380) at
state_tracker/st_atom_shader.c:86
#6 0xb6d506e6 in st_validate_state (st=0xb68e5380) at
state_tracker/st_atom.c:197
#7 0xb6d5756a in st_Clear (ctx=0xb6916000, mask=18) at
state_tracker/st_cb_clear.c:497
#8 0xb6d15b10 in _mesa_Clear (mask=<value optimized out>) at
main/clear.c:250
#9 0x0805020b in event_loop (dpy=0xb77d52e0, win=37748738,
glxw=37748739, sd=0xbff75da4) at main.c:2671
#10 0x08051970 in main (argc=1, argv=0xbffff534) at main.c:3330
possible fix:
replace:
> t->constants = CALLOC( program->Parameters->NumParameters,
> sizeof t->constants[0] );
with:
> t->constants = CALLOC(
>(program->Parameters->NumParameters==0)?1:program->Parameters->NumParameters,
> sizeof t->constants[0] );
But this may just mask a more significant BUG...
JK
--
To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
