panic: vput: negative ref cnt
Stefan Bethke
stb at lassitu.de
Sun Apr 5 02:05:27 PDT 2009
Am 04.04.2009 um 13:55 schrieb Mark Powell:
> Hi,
> Getting a reproducable panic during backups:
>
> panic: vput: negative ref cnt
> cpuid = 0
> KDB: enter: panic
> [thread pid 3521 tid 100374 ]
> Stopped at kdb_enter+0x3d: movq $0,0x654104(%rip)
> db> bt
> Tracing pid 3521 tid 100374 0xffffff008c79e380
> kdb_enter() at kdb_enter+0x3d
> panic() at panic+0x176
> vput() at vput+0x10c
> dounmount() at dounmount0x421
> unmount() at unmount+0x24b
> syscall() at syscall+0x1bf
> Xfast_syscall() at Xfast_syscall+0xab
> --- syscall (22, FreeBSD ELF64, unmount), rip = 0x800695d7c, rsp =
> 0x7fffffffe218, rbp = 0 ---
>
> My script takes a zfs snapshot, mounts the snapshot, backs it up
> using star, then umounts the snapshot. The panic seems to occur on
> the umount.
This is a different panic from the one I was getting, but appears to
occur under the same circumstances.
I managed to avoid the panic by keeping the snapshot until the next
run of my backup script, and not unmounting anything.
See <http://lists.freebsd.org/pipermail/freebsd-current/2009-February/003513.html
>
Stefan
--
Stefan Bethke <stb at lassitu.de> Fon +49 151 14070811
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