Date: Tue, 16 Aug 2011 04:05:19 +0000 From: John <jwd@freebsd.org> To: freebsd-fs@freebsd.org Cc: freebsd-current@freebsd.org Subject: Three LOR with latest -current Message-ID: <20110816040519.GA49864@FreeBSD.org>
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Hi folks, I'm seeing 3 lock order reversals with an up-to-date -current system. Stock system, GENERIC kernel. Let me know if this isn't enough information. Just booting the system and the dmesg. Thanks, John lock order reversal: 1st 0xfffffe0289627db8 ufs (ufs) @ /usr/src.2011-08-14_10.53pm_EDT/sys/ufs/ffs/ffs_snapshot.c:425 2nd 0xffffff9f0db49778 bufwait (bufwait) @ /usr/src.2011-08-14_10.53pm_EDT/sys/kern/vfs_bio.c:2658 3rd 0xfffffe00404a8098 ufs (ufs) @ /usr/src.2011-08-14_10.53pm_EDT/sys/ufs/ffs/ffs_snapshot.c:546 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a kdb_backtrace() at kdb_backtrace+0x37 _witness_debugger() at _witness_debugger+0x2e witness_checkorder() at witness_checkorder+0x807 __lockmgr_args() at __lockmgr_args+0xdc6 ffs_lock() at ffs_lock+0x8c VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b _vn_lock() at _vn_lock+0x47 ffs_snapshot() at ffs_snapshot+0x1c31 ffs_mount() at ffs_mount+0xa24 vfs_donmount() at vfs_donmount+0xddc nmount() at nmount+0x63 syscallenter() at syscallenter+0x1aa syscall() at syscall+0x4c Xfast_syscall() at Xfast_syscall+0xdd --- syscall (378, FreeBSD ELF64, nmount), rip = 0x800abde1c, rsp = 0x7fffffffd968, rbp = 0x801008130 --- lock order reversal: 1st 0xffffff9f0db49778 bufwait (bufwait) @ /usr/src.2011-08-14_10.53pm_EDT/sys/kern/vfs_bio.c:2658 2nd 0xfffffe004034dcb0 snaplk (snaplk) @ /usr/src.2011-08-14_10.53pm_EDT/sys/ufs/ffs/ffs_snapshot.c:818 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a kdb_backtrace() at kdb_backtrace+0x37 _witness_debugger() at _witness_debugger+0x2e witness_checkorder() at witness_checkorder+0x807 __lockmgr_args() at __lockmgr_args+0xdc6 ffs_lock() at ffs_lock+0x8c VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b _vn_lock() at _vn_lock+0x47 ffs_snapshot() at ffs_snapshot+0x1b0c ffs_mount() at ffs_mount+0xa24 vfs_donmount() at vfs_donmount+0xddc nmount() at nmount+0x63 syscallenter() at syscallenter+0x1aa syscall() at syscall+0x4c Xfast_syscall() at Xfast_syscall+0xdd --- syscall (378, FreeBSD ELF64, nmount), rip = 0x800abde1c, rsp = 0x7fffffffd968, rbp = 0x801008130 --- lock order reversal: 1st 0xfffffe004034dcb0 snaplk (snaplk) @ /usr/src.2011-08-14_10.53pm_EDT/sys/kern/vfs_vnops.c:301 2nd 0xfffffe0289627db8 ufs (ufs) @ /usr/src.2011-08-14_10.53pm_EDT/sys/ufs/ffs/ffs_snapshot.c:1620 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a kdb_backtrace() at kdb_backtrace+0x37 _witness_debugger() at _witness_debugger+0x2e witness_checkorder() at witness_checkorder+0x807 __lockmgr_args() at __lockmgr_args+0xdc6 ffs_snapremove() at ffs_snapremove+0xe7 ffs_truncate() at ffs_truncate+0x302 ufs_inactive() at ufs_inactive+0x260 vinactive() at vinactive+0x72 vputx() at vputx+0x386 vn_close() at vn_close+0x118 vn_closefile() at vn_closefile+0x5a _fdrop() at _fdrop+0x23 closef() at closef+0x5c kern_close() at kern_close+0x121 syscallenter() at syscallenter+0x1aa syscall() at syscall+0x4c Xfast_syscall() at Xfast_syscall+0xdd --- syscall (6, FreeBSD ELF64, close), rip = 0x800b5e2bc, rsp = 0x7fffffffd968, rbp = 0 ---
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