ZFS panic on a RELENG_8 NFS server (Was: panic: spin lock held
too long (RELENG_8 from today))  Hiroki Sato hrs at FreeBSD.org
Fri Sep 9 20:10:46 UTC 2011  Hiroki Sato <hrs at freebsd.org>
wrote   in <20110907.094717.2272609566853905102.hrs at
allbsd.org>:  hr>  During this investigation an disk has to be
replaced and resilvering hr>  it is now in progress.  A deadlock
and a forced reboot after that hr>  make recovering of the zfs
datasets take a long time (for committing hr>  logs, I think),
so I will try to reproduce the deadlock and get a hr>  core dump
after it finished.   I think I could reproduce the symptoms.  I
have no idea about if  these are exactly the same as occurred on
my box before because the  kernel was replaced with one with
some debugging options, but these  are reproducible at least.
There are two symptoms.  One is a panic.  A DDB output when the
panic  occurred is the following:  Fatal trap 12: page fault
while in kernel mode cpuid = 1; apic id = 01 fault virtual
address   = 0x100000040 f