> With:
> panic: lockmgr: no context
> It is in vndstrategy:
> 		vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY | LK_CANRECURSE);
> 
> This means that I/O on the vnd block device expect to be called from
> a process context, while the xbd backend calls it from interrupt context.

do you have a backtrace?

YAMAMOTO Takashi