Date: Thu, 31 Dec 2009 11:10:00 +0000 From: Pete French <petefrench@ticketswitch.com> To: freebsd-stable@freebsd.org Subject: lock order reversals in RELENG_8 Message-ID: <E1NQIum-000C04-7O@dilbert.ticketswitch.com>
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am still trying to get the machine which ocks up to lock up when I have DDb, KDB and WITNESS in the ernel. It's not locked yet but I have got the following in dmesg... lock order reversal: 1st 0xffffff8052321e50 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2559 2nd 0xffffff000384a800 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:285 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _witness_debugger() at _witness_debugger+0x2c witness_checkorder() at witness_checkorder+0x66f _sx_xlock() at _sx_xlock+0x35 ufsdirhash_acquire() at ufsdirhash_acquire+0x33 ufsdirhash_remove() at ufsdirhash_remove+0x18 ufs_dirremove() at ufs_dirremove+0x161 ufs_remove() at ufs_remove+0x92 VOP_REMOVE_APV() at VOP_REMOVE_APV+0x34 kern_unlinkat() at kern_unlinkat+0x252 syscall() at syscall+0x19d Xfast_syscall() at Xfast_syscall+0xe1 --- syscall (10, FreeBSD ELF64, unlink), rip = 0x80072a28c, rsp = 0x7fffffffe418, rbp = 0x7fffffffef6e --- lock order reversal: 1st 0xffffff003e230d80 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:1058 2nd 0xffffff003e2307f8 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2083 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _witness_debugger() at _witness_debugger+0x2c witness_checkorder() at witness_checkorder+0x66f __lockmgr_args() at __lockmgr_args+0x475 vop_stdlock() at vop_stdlock+0x39 VOP_LOCK1_APV() at VOP_LOCK1_APV+0x46 _vn_lock() at _vn_lock+0x47 vget() at vget+0x56 devfs_allocv() at devfs_allocv+0x103 devfs_root() at devfs_root+0x48 vfs_donmount() at vfs_donmount+0xf43 nmount() at nmount+0x63 syscall() at syscall+0x19d Xfast_syscall() at Xfast_syscall+0xe1 --- syscall (378, FreeBSD ELF64, nmount), rip = 0x8007b062c, rsp = 0x7fffffffdd28, rbp = 0x
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