(ZFS?): panic: lockmgr: locking against myself
peter.schuller at infidyne.com
Mon Jan 21 10:22:19 PST 2008
> I *think* I just experienced the same problem on 7.0-BETA3, except the
> kernel does not have WITNESS/INVARIANTS so I just get a hack instead of a
> panic. I wanted to post with the information I have for completeness; I
> realize what follows is a bunch of anecdotal mumbo-jumbo.
So I can now confirm this problem on 7.0-RC1 on the machine where I originally
saw this happen.
If I could trigger this in a debuggable environment I would try to get some
much more interesting information, but as this was during time-limited access
to the machine in a noisy colocation facility, with people waiting on the
machine to come back up, I was not in a position to do very much. Instead I
will again, as an added data point, provide an approximate timeline below. As
previously observed, it seems to be triggered by changes in the availability
of disks and/or zpool configuration, with cold reboots somehow mitigating the
Note that the drives are likely to have been moved around a bit logically (but
not physically), due to the level of indirection and drive number allocation
resulting from the single-disk raid0 virtual hardware raid device.
* Machine running 7-CURRENT from the october/september era.
* One disk in a three-way zfs mirror (tank, on which root fs is) gets kicked
* For probably unrelated reasons, the machine crashes with a kmem_alloc error
(this was the first time ever on this machine). Don't have details; this was
observed by colocation personel.
* Machine rebooted and panic:s as described in this thread.
* I arrive on-site and reboot again just for kicks. Same problem.
* I physically remove the broken disk and replace it with the new one, and add
the virtual disk in the RAID controller bios (recap: this is a Dell 2950).
* Now it boots again.
* I zpool replace tank label/tank3 label/tank3r1 (after various
* make installkernell (7.0-RC1)
* Reboot with resilvering/replacement still in progress.
* Panic on boot.
* Tried cold reboot (turn off,turn on) -> it now boots again without a panic.
* Make installworld.
* At this point I no longer remember whether it booted again or whether I had
to do another cold reboot.
* Machine has not been rebooted again since resilvering completed.
/ Peter Schuller
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