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Created attachment 479855 [details]
output of gdb --pid `pidof spicec`

Description of problem:
after a clean install of Win XP guest, I switched to full screen and back and then:
- spicec window disappeared
- X resolution was kept at guest's 800x600 instead of returning back to 1920x1080

Version-Release number of selected component (if applicable):
spice-client-0.7.3-1.el6.x86_64
spice-server-0.7.2-4.el6.x86_64
qemu-kvm-0.12.1.2-2.147.el6.x86_64
xorg-x11-server-Xorg-1.7.7-28.el6.x86_64

How reproducible:
didn't try to reproduce

Created attachment 479856 [details]
spicec.log

Created attachment 479857 [details]
X log

Created attachment 479859 [details]
dmesg output

Created attachment 479860 [details]
qemu-kvm command line output

Created attachment 480129 [details]
bt of another crash in main.cpp:34

I got another crash in main.cpp:34, this time when switching rhel6/32 guest from console to X. Command line for qemu was:

qemu-kvm -boot order=c -net nic -net tap,ifname=$TAP,script=no -smp 2 -m 1024 -name rhel6_32 -enable-kvm -spice port=3000,disable-ticketing -soundhw ac97 -vga qxl -device virtio-serial -chardev spicevmc,id=vdagent,debug=0,name=vdagent -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 /dev/root_vg/q-rhel6_32

Created attachment 480165 [details]
full backtrace, otherwise the same as in previous attachment

Splitting this bug because it involves two issues:
 * one is the bad parameter which we (Hans, myself) couldn't reproduce.
 * the other is the cause of the hang, which looks like we are taking the XLockDisplay in a non main thread, and then in the main thread it gets stuck on it. The proposed solution is to keep a counter on outstanding XLockDisplay, and if it's non zero in the X error handler don't do any further X operations.

If you manage to reproduce this bug (this is left as the bug for the bad parameter) please reopen it.