re: lib/53773: xfwm4 crashes with composititing enabled

[matthew green <mrg%eterna.com.au@localhost>]

i'm not sure this is the same, but the GPU is the same generation
(CEDAR).  i had an uncommon crash in mesa where it would be accessing
some allocated space but the allocation was smaller than expected,
in the few cases i debugged closer, the accessses were 128 bytes
after the end of the actual mapping.  i was guessing some mmap size
is being truncated and the final page is missed, but i was not able
to figure out where these allocations were created.

i saw crashes in firefox and mpv mostly, but ksudoku also crashed
at least once.

i ended up putting a radeon3650 card in my desktop.  (it was also
silent, and benchmarks roughly 1.5x the speed of the newer CEDAR.)


.mrg.