K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2020-05-27T19:13:26.294762Z
K 7
svn:log
V 553
geli: fix a livelock during panic

During any kind of shutdown, kern_reboot calls geli's pre_sync event hook,
which tries to destroy all unused geli devices. But during a panic, geli
can't destroy any devices, because the scheduler is stopped, so it can't
switch threads. A livelock results, and the system never dumps core.

This commit fixes the problem by refusing to destroy any devices during
panic, used or otherwise.

PR:		246207
Reviewed by:	jhb
MFC after:	2 weeks
Sponsored by:	Axcient
Differential Revision:	https://reviews.freebsd.org/D24697

END