[Bug 34545] New: [gallium] segfault with vertarrays in mixed user/gpu buffers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34545

           Summary: [gallium] segfault with vertarrays in mixed user/gpu
                    buffers
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: wixorpeek at gmail.com
                CC: maraeo at gmail.com


Created an attachment (id=43618)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43618)
the test case

Hello, while researching for bug 34418 I have encountered an segmentation fault
trigerred when the __first__ vertex array is placed in user buffer and the
second on gpu. When first array in on gpu and second in user buffer, invalid
rendering occurs. This is gallium-wide (happens with both r300g and swrastg),
although I cannot extract meaningful backtrace from swrastg. My shot is that
is_interleaved_arrays in st_draw.c handles those cases incorrectly (at least
that's the code that gave me inspiration to write the test). Interestingly, the
backtraces from r300g have changed between HEAD and before-2a904fd6a0c (before
"set vertex arrays state only when necessary"). This is propably correct. The
current one is

#0  radeon_add_reloc (rcs=0x7f5b1e508010, buf=0x0, rd=R300_DOMAIN_GTT, wd=0) at
radeon_drm_cs.c:230
#1  radeon_drm_cs_add_reloc (rcs=0x7f5b1e508010, buf=0x0, rd=R300_DOMAIN_GTT,
wd=0) at radeon_drm_cs.c:297
#2  0x00007f5b1a79f032 in r300_emit_buffer_validate (r300=0x16993a0,
do_validate_vertex_buffers=<value optimized out>, index_buffer=<value optimized
out>)
    at r300_emit.c:1192
#3  0x00007f5b1a7a21f1 in r300_emit_states (r300=0x16993a0, flags=<value
optimized out>, index_buffer=0x2, buffer_offset=0, index_bias=0) at
r300_render.c:252
#4  0x00007f5b1a7a3d95 in r300_draw_arrays (pipe=0x16993a0, info=<value
optimized out>) at r300_render.c:710
#5  r300_draw_vbo (pipe=0x16993a0, info=<value optimized out>) at
r300_render.c:775
#6  0x00007f5b1a849de8 in st_draw_vbo (ctx=<value optimized out>, arrays=<value
optimized out>, prims=<value optimized out>, nr_prims=1, ib=0x0, 
    index_bounds_valid=<value optimized out>, min_index=0, max_index=31) at
state_tracker/st_draw.c:717
#7  0x00007f5b1a8e18fb in vbo_draw_arrays (ctx=0x16bb170, mode=6, start=0,
count=<value optimized out>, numInstances=1) at vbo/vbo_exec_array.c:615
#8  0x0000000000400e1f in render () at immedcrash.c:15

while the old one is 

#0  0x00007f74d66a823a in u_vbuf_mgr_set_vertex_buffers (mgrb=0x1ea5060,
count=1, bufs=0x0) at util/u_vbuf_mgr.c:482
#1  0x00007f74d64e50aa in r300_set_vertex_buffers (pipe=0x1eb6360, count=1,
buffers=0x7fff228a33d0) at r300_state.c:1491
#2  0x00007f74d6586fcf in st_draw_vbo (ctx=<value optimized out>, arrays=<value
optimized out>, prims=<value optimized out>, nr_prims=<value optimized out>, 
    ib=<value optimized out>, index_bounds_valid=<value optimized out>,
min_index=0, max_index=31) at state_tracker/st_draw.c:707
#3  0x00007f74d661ee4b in vbo_draw_arrays (ctx=0x1ee3f10, mode=6, start=0,
count=<value optimized out>, numInstances=1) at vbo/vbo_exec_array.c:593
#4  0x0000000000400e1f in render () at immedcrash.c:15

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