Date: Sat, 4 Apr 2009 12:55:45 +0100 (BST) From: "Mark Powell" <M.S.Powell@salford.ac.uk> To: freebsd-current@freebsd.org Subject: panic: vput: negative ref cnt Message-ID: <20090404124909.C24261@rust.salford.ac.uk>
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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. Cheers. -- Mark Powell - UNIX System Administrator - The University of Salford Information & Learning Services, Clifford Whitworth Building, Salford University, Manchester, M5 4WT, UK. Tel: +44 161 295 6843 Fax: +44 161 295 5888 www.pgp.com for PGP key
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