Date: Sun, 26 Apr 2009 22:27:16 -0400 From: Josh Carroll <josh.carroll@gmail.com> To: current-list freebsd <freebsd-current@freebsd.org> Subject: zfs/syncer LOR Message-ID: <8cb6106e0904261927t42b97436y3de41556ca1e83e@mail.gmail.com>
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All, I didn't see this LOR reported here: http://sources.zabbadoz.net/freebsd/lor.html Or with a quick perusal of the current@ archives, so apologies if it's a known one. I unfortunately don't recall what I was doing when this one popped up, but if I can reproduce it, I'll certainly post some additional info. Anyway, here it is: lock order reversal: 1st 0xffffff000b219ba8 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:1193 2nd 0xffffff000ba46270 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:2206 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _witness_debugger() at _witness_debugger+0x49 witness_checkorder() at witness_checkorder+0x7ca __lockmgr_args() at __lockmgr_args+0xc2b vop_stdlock() at vop_stdlock+0x39 VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b _vn_lock() at _vn_lock+0x50 vrele() at vrele+0x121 dounmount() at dounmount+0x26a unmount() at unmount+0x248 syscall() at syscall+0x1c1 Xfast_syscall() at Xfast_syscall+0xd0 --- syscall (22, FreeBSD ELF64, unmount), rip = 0x800695ecc, rsp = 0x7fffffffe298, rbp = 0x1 --- Thanks, Josh
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