Hi I can also reproduce the kwin segfaults in a live environment under kvm, using xserver-xorg-video-modesetting and kernel 3.5/ 3.6~, interestingly the problems disappear if I bump up kvm's system RAM to ~3 GB or more (it reliably fails up to and including 2.5 GB).
With Fix-JIT-crash-on-x86-64-avoid-32-bit-branch-offset-o.patch
removed, I can drop system RAM down to 768 MB (or maybe lower) without
observing any segfaults, so that patch definately causes this trouble.
Regards
Stefan Lippers-Hollmann
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