09.03.2011 10:26, Stefan Weil wrote: > Am 08.03.2011 23:53, schrieb Peter Lieven: >> Hi, >> >> during testing of qemu-kvm-0.14.0 i can reproduce the following >> segfault. i have seen similar crash already in 0.13.0, but had no time >> to debug. >> my guess is that this segfault is related to the threaded vnc server >> which was introduced in qemu 0.13.0. the bug is only triggerable if a vnc >> client is attached. it might also be connected to a resolution change >> in the guest. i have a backtrace attached. the debugger is still >> running if someone >> needs more output >> [] > Hi Peter, > > did you apply this patch which fixes one of the known vnc problems > (but is still missing in qemu git master): > > http://lists.nongnu.org/archive/html/qemu-devel/2011-03/msg00256.html
This patch is not suitable for 0.14 since in current qemu/master quite alot of stuff were changed in this area (bitmaps added), there's no similar infrastructure in 0.14. > Then you can read this thread: > > http://lists.nongnu.org/archive/html/qemu-devel/2011-03/msg00313.html > > And finally the following modifications of ui/vnc.c might help to see > whether you experience the same kind of crash as I get here in > my environment. They add assertions for bad memory access > which occurs sometimes when a vnc client-server connection exists and > the screen is refreshed after a resolution change. > The code line with the //~ comment also includes a fix which > works for me. The same is true for this patch, but of a less extent: it can be applied manually (the bitmap_empty context line). I wonder if something similar actually exists in 0.13/0.14 too and needs to be backported to -stable. > Regards, > Stefan W. Thanks! /mjt
