<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Blender crashes when compiling OpenCL kernel" href="https://bugs.freedesktop.org/show_bug.cgi?id=102009#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Blender crashes when compiling OpenCL kernel" href="https://bugs.freedesktop.org/show_bug.cgi?id=102009">bug 102009</a> from <a class="email" href="mailto:jan.vesely@rutgers.edu" title="Jan Vesely <jan.vesely@rutgers.edu>"> Jan Vesely</a> <pre>(In reply to Markus from <a href="show_bug.cgi?id=102009#c7">comment #7</a>) > I tried to obtain debug information from Mesa but was unable to do so (i.e. > starting Blender with `MESA_DEBUG=context CYCLES_OPENCL_SPLIT_KERNEL_TEST=1 > ./blender` did not generate any visible debug information). > > What I did instead, is run Blender via gdb which then gave the attached > stack trace at the time of crash. Looking at the trace, it appears like the > crash is inside LLVM. > > What is the best way to debug this further? > > P.S.: As I just updated to Ubuntu 17.10 (Beta 2), I've also attached new > glxinfo and clinfo output. you can use CLOVER_DEBUG=clc,llvm,native CLOVER_DEBUG_FILE=blender to force clover to dump compiled CL programs (it should produce several dump files for .clc .ll .asm). Make sure the kernels are compiled and not loaded fomr ~/.cache/cycles/kernels >From there you can run and debug LLVM on the command line. Note that I have been unable to reproduce this. blender-2.79 on OpenCL 1.1 Mesa 17.4.0-devel (git-138adc72e7) AMD Radeon R7 Graphics (CARRIZO / DRM 3.18.0 / 4.11.0-ROC-SC, LLVM 5.0.1) AMD Radeon (TM) R7 M340 (ICELAND / DRM 3.18.0 / 4.11.0-ROC-SC, LLVM 5.0.1) instead it hits MAX_GLOBAL_BUFFERS assertion in radeonsi pipe driver. bumping the limit renders a picture albeit much different from CPU rendering</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>