The vertProg1 test core dumps because ctx->DrawBuffer is NULL in the radeonFlush() function: Core was generated by `bin/glean -r foo -t vertProg1'. Program terminated with signal 11, Segmentation fault. #0 0x00007f7f4f7ed36a in radeonFlush (ctx=0x1cd9b30) at radeon_common.c:1129 1129 if ((ctx->DrawBuffer->Name == 0) && radeon->front_buffer_dirty) { Missing separate debuginfos, use: debuginfo-install expat-2.0.1-8.fc12.x86_64 glibc-2.11.1-1.x86_64 libICE-1.0.6-1.fc12.x86_64 libSM-1.1.0-7.fc12.x86_64 libX11-1.3-1.fc12.x86_64 libXau-1.0.5-1.fc12.x86_64 libXdamage-1.1.2-1.fc12.x86_64 libXext-1.1-2.fc12.x86_64 libXfixes-4.0.4-1.fc12.x86_64 libXi-1.3-2.fc12.x86_64 libXmu-1.0.5-1.fc12.x86_64 libXt-1.0.7-1.fc12.x86_64 libXxf86vm-1.1.0-1.fc12.x86_64 libdrm-2.4.18-0.1.fc12.x86_64 libgcc-4.4.3-4.fc12.x86_64 libjpeg-6b-46.fc12.x86_64 libstdc++-4.4.3-4.fc12.x86_64 libtiff-3.9.2-3.fc12.x86_64 libuuid-2.16.2-7.fc12.x86_64 libxcb-1.5-1.fc12.x86_64 zlib-1.2.3-23.fc12.x86_64 (gdb) print ctx $1 = (GLcontext *) 0x1cd9b30 (gdb) print ctx->DrawBuffer $2 = (GLframebuffer *) 0x0
This same bug seems to be triggered by "bin/vp-bad-program -auto".
The problem happens when destroying the GLContext: - we call _mesa_free_context_data(), which sets ctx->DrawBuffer = NULL - _mesa_free_context_data() then calls _mesa_free_texture_data() - _mesa_free_texture_data() calls r600DeleteTexture() - r600DeleteTexture() calls radeonFlush() via radeon_firevertices() - radeonFlush() tries to dereference ctx->DrawBuffer, which has just been set to NULL - BANG! Adding a simple (ctx->DrawBuffer != NULL) check to radeonFlush() makes 43 of the vertProg1 piglit tests pass, with 2 failures: Program: RSQ test 2 (reciprocal square root of negative value) Expected color: -1, 0.1, 0.447, 1 Observed color: 0, 0, 0, 0 Program: LIT test 2 (degenerate case: 0 ^ 0 -> 1) Expected color: 1, 0.65, 1, 1 Observed color: 1, 0.65098, 0, 1
Patches are welcome :) You can send the fix to mesa3d-dev@lists.sourceforge.net. git commands format-patch and send-email are very easy tools to send patches to the mailing list.
(In reply to comment #3) > Patches are welcome :) Actually, I would describe this as "the cause" rather than "the fix". I was hoping that someone who understands what the code *should* be doing would step in at this point. Maybe Mesa shouldn't be calling radeonFlush() in the first place here? Or maybe ctx->DrawBuffer shouldn't be unreferenced so early in the clean-up sequence? I have no intention of papering over this bug with an off-hand NULL check at this stage.
I think this may have been fixed by fef9b532cd1631cc53056b9eba4369d1310b88df. For reference, the bug that patch fixes happens when a context is destroyed that's not the current context. For example because the current context has already been set to NULL.
*** Bug 28260 has been marked as a duplicate of this bug. ***
Note: classic r600 driver has been abandoned. all glean/vertProg1 tests pass with r600g (gallium driver) on my rv770 tested with mesa git master e81ee67b51651e99e7e8e52c1ccafc66835d57cd and mesa 8.0.4
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