Distr: Arch Linux (up-to-date) Firefox version: 49.0.2 xfwm4 version: 4.12.3 Opera version: 41.0.2353.46-1 How to reproduce: 1. Open twitter in browser (tried both firefox and opera). 2. Open there some particular tweet with embedded video (I'm not sure video presense is a key though). 3. xfwm and panel crashes (while browser keeps working fine). dmesg output for the failure is: [ 2272.201439] xfwm4[748]: segfault at 0 ip 00007f3bf5e0e8d1 sp 00007ffdf0fdf510 error 4 in libfontconfig.so.1.9.2[7f3bf5e03000+3e000] [ 2272.203317] xfce4-panel[752]: segfault at 0 ip 00007fbcb547d8d1 sp 00007ffc8cc47b40 error 4 in libfontconfig.so.1.9.2[7fbcb5472000+3e000] [ 2272.456342] xfwm4[4209]: segfault at 0 ip 00007fe3eec6b8d1 sp 00007ffcf3b37040 error 4 in libfontconfig.so.1.9.2[7fe3eec60000+3e000] [ 2272.681480] xfwm4[4221]: segfault at 0 ip 00007fb9ac1078d1 sp 00007ffd61a561a0 error 4 in libfontconfig.so.1.9.2[7fb9ac0fc000+3e000] [ 2272.962011] xfwm4[4231]: segfault at 0 ip 00007f644eb288d1 sp 00007fff7ca44440 error 4 in libfontconfig.so.1.9.2[7f644eb1d000+3e000] [ 2273.199728] xfwm4[4250]: segfault at 0 ip 00007f6106cba8d1 sp 00007ffcd3859640 error 4 in libfontconfig.so.1.9.2[7f6106caf000+3e000] [ 2273.407217] xfwm4[4261]: segfault at 0 ip 00007f6a973c98d1 sp 00007ffc1af94e80 error 4 in libfontconfig.so.1.9.2[7f6a973be000+3e000]
Can you please attach gdb to xfwm4 and capture the full backtrace of the crash?
That looks like it's fontconfig crashing
It turned out that it was an issue with fontconfig configuration files. Didn't thought about that initially because modifications were made a lot of months ago but I never had any issues. My apologies for a false alarm.
No worries, glad it's root caused and thanks for the update.