https://bugs.freedesktop.org/show_bug.cgi?id=89562
Bug ID: 89562
Summary: glXSwapIntervalMESA crashes when making use of
GLX_MESA_multithread_makecurrent
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: GLX
Assignee: mesa-dev@lists.freedesktop.org
Reporter: jl...@feralinteractive.com
QA Contact: mesa-dev@lists.freedesktop.org
Created attachment 114264
--> https://bugs.freedesktop.org/attachment.cgi?id=114264&action=edit
test case
If two threads have the same current glX context, as permitted by
GLX_MESA_multithread_makecurrent, then calling glXSwapIntervalMESA results in
invoking dri2SetSwapInterval with the pdraw argument set to NULL.
dri2SetSwapInterval then dereferences pdraw, causing a segmentation fault. The
attached program reproduces this.
You can also reproduce the same crash by letting a thread exit with a context
bound and then making the context current on another thread and calling
glXSwapIntervalMESA there (this seems a bit dirty, but if there is no
requirement to unbind GL contexts before exiting threads, then this method
doesn't require GLX_MESA_multithread_makecurrent). If you add -DTEST2 to the
compiler flags when compiling the attached file, this crash will be reproduced
instead.
This affects at least Mesa 10.4.3, 10.5, and git master at revision
48b0a3c1c9d829a9b1d401afb2796b35df94a5d7.
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