kernel: page fault in unp_pcb_owned_lock2_slowpath

[Leverett, Bruce]

In 12.1, we are seeing a page fault in unp_pcb_owned_lock2_slowpath, while trying to lock unp2.  Examination of the crash dump shows that unp2's reference count is down to zero, which it shouldn't be, since the function took a reference on it before unlocking unp.

Could this be a bug that has been fixed in recent versions?  I would look into upgrading, or back-porting the fix, if a fix is known.

Bruce Leverett
Panasas, Inc.