panic on resume using XFCE4

[nomadlogic]

I can reproduce a panic under the following conditions:

• use XFCE4 window manager
• start XFCE4 with external HDMI monitor connected
• remove HDMI display
• put laptop to sleep (enter S3 state via closing laptop)
• open lid after system had entered S3
• panic

panic: mutex Gian owned at /usr/home/pwright/git/freebsd-base-graphics/sys/kern/kern_synch.c:394

Interestingly enough I can not reproduce this panic with Mate. Here is a screenshot of the panic: https://goo.gl/photos/ASKBvJi3erBrWCvVA

[markjdb]

Could you please give this patch a try? https://people.freebsd.org/~markj/patches/linuxkpi_drop_giant.diff

[nomadlogic]

Rad, this seems to fix it up. I'll dog-food XFCE4 for a couple days to be sure, but I am unable to reproduce this after applying your patch.

Thanks!

[markjdb]

Excellent, thanks for testing.

[markjdb]

The change was committed to FreeBSD as r317148. It'll get picked up in the next merge.