[Mesa-dev] [Bug 42128] Crash when visiting a site with Firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42128

--- Comment #14 from Ian Romanick <idr at freedesktop.org> 2012-02-23 09:05:47 PST ---
(In reply to comment #12)
> OK, indeed we should not attempt to do WebGL on OpenGL 1.
> 
> But the stack trace in https://bugzilla.mozilla.org/show_bug.cgi?id=696636#c11
> also shows that there is a driver bug here.

Agreed.  By the time that stacktrace was taken, the underlying bug had done its
damage.  That's why I asked (comment #11) for an additional backtrace from
_mesa_problem.  Something is causing the driver to create a DEPTH_COMPONENT24
texture, but that hardware doesn't support depth textures at all.  As a result,
by the time execution gets to _mesa_get_format_bytes or intel_region_alloc,
it's passing around garbage data.  In the intel_region_alloc case, the texture
format is unknown to the driver, so cpp is zero.  The divide by cpp causes the
SIGFPE.

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