fix: crash in exception handling after OSL JIT#2113
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lgritz merged 1 commit intoAcademySoftwareFoundation:mainfrom Apr 23, 2026
Merged
fix: crash in exception handling after OSL JIT#2113lgritz merged 1 commit intoAcademySoftwareFoundation:mainfrom
lgritz merged 1 commit intoAcademySoftwareFoundation:mainfrom
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This change fixes crashes that could be observed on Ubuntu 24.04. The crash happens in exception handling after rendering a scene with OSL shaders. This seems to be a bug in libgcc which was fixed in 14.3, but Ubuntu 24.04 is shipped with 14.2. There is a report in the GCC bug tracker: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119151 Note that this is a runtime dependency, so it doesn't really matter that a different GCC version was using during compilation as the EH frames registration happens at runtime. The easiest solution is to simply disable EH frames registration in OSL's MemoryManager. This should not affect any runtime exception unwinding as this MemoryManager is only used during JIT, so all the EH frames are unregistered from the process when the JIT code is actually executed. The issue was originally noticed in Blender, here is the report with some extra investigation and details: https://projects.blender.org/blender/blender/issues/156348 Signed-off-by: Sergey Sharybin <sergey@blender.org>
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LGTM.
I'm taking for granted that this fixes the problem on your end, it's not one I'd seen or reproduced.
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This change fixes crashes that could be observed on Ubuntu 24.04. The crash happens in exception handling after rendering a scene with OSL shaders.
This seems to be a bug in libgcc which was fixed in 14.3, but Ubuntu 24.04 is shipped with 14.2. There is a report in the GCC bug tracker:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119151
Note that this is a runtime dependency, so it doesn't really matter that a different GCC version was using during compilation as the EH frames registration happens at runtime.
The easiest solution is to simply disable EH frames registration in OSL's MemoryManager. This should not affect any runtime exception unwinding as this MemoryManager is only used during JIT, so all the EH frames are unregistered from the process when the JIT code is actually executed.
The issue was originally noticed in Blender, here is the report with some extra investigation and details:
https://projects.blender.org/blender/blender/issues/156348