Date: Sun, 7 Feb 2010 16:00:32 +0000 From: Bruce Cran <bruce@cran.org.uk> To: current@freebsd.org Cc: bzeeb+freebsd+lor@zabbadoz.net Subject: LOR: vfs_mount.c (ufs) / msdosfs_vfsops.c (devfs) Message-ID: <20100207160031.GA27434@muon.cran.org.uk>
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Running -CURRENT from today, I unmounted the msdosfs filesystem on my phone and got the following LOR: lock order reversal: 1st 0xffffff00c51279f8 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:1204 2nd 0xffffff010b892278 devfs (devfs) @ /usr/src/sys/modules/msdosfs/../../fs/msdosfs/msdosfs_vfsops.c:944 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _witness_debugger() at witness_debugger+0x2e witness_checkorder() at witness_checkorder+0x81e __lockmgr_args() at __lockmgr_args+0xd11 vop_stdlock() at vop_stdlock+0x39 VOP_LOCK1_APV() VOP_LOCK1_APV+0x9b _vn_lock() at _vn_lock+0x47 msdosfs_sync() at msdosfs_sync+0x227 dounmount() at dounmount+0x2ca unmount() at unmount+0x216 syscall() at syscall+0x2a2 Xfast_syscall() at Xfast_syscall+0xe1 --- syscall (22, FreeBSD ELF64, unmount), rip = 0x8006a1e3c, rsp = 0x7fffffffe3a8, rbp = 0x800c08010 --- -- Bruce Cran
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