Upstream MythTV indicated that this is actually a bug in mesa. Quoting
on MythTV #4206:
For anyone keeping score at home various myth threads open and close the
display for local queries. Inside X11 this eventually works its way down
to dri_glx.c::OpenDriver? which dlopen's the correct .so on the first
call. Subsequent calls get the handle from that initial dlopen.
Unfortunately this doesn't increment the reference count for the .so and
a dlclose at the first nested XOpenDisplay/XCloseDisplay (like in
libmythtv's get_glx_version) causes the dri library to be unloaded and
soon after that MythTV go boom. The unload message in the initial report
turned out to be the key, something I realized moments after submitting
the bug.
The quick fix, and this is Linux-specific, is to tweak the inital search
at the top of OpenDriver? in mesa's dri_glx.c.
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
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mythfrontend.real crashed with SIGSEGV in glXMakeCurrentReadSGI()
https://bugs.launchpad.net/bugs/189580
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