K 10
svn:author
V 2
bz
K 8
svn:date
V 27
2020-09-04T18:29:59.145896Z
K 7
svn:log
V 289
umass: enhance debugging

Investigating a hang I found having some more error information
available would be helpful, so be more verbose and also tell cam/xpt
status in case of error/panic.

Reviewed by:	hselasky
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D26287

END