Date: Tue, 14 Sep 2010 08:14:42 +0000 From: "b. f." <bf1783@googlemail.com> To: freebsd-current@FreeBSD.org Cc: bzeeb+freebsd+lor@zabbadoz.net Subject: An LOR recently observed on r212598 Message-ID: <AANLkTimKmyF_NcTu4Nvv8wKRxpm0XZt=-tnBzgKxPAZc@mail.gmail.com>
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An LOR, which resembles another reported in: http://lists.freebsd.org/pipermail/freebsd-current/2010-August/018986.html but none that I noticed at: http://sources.zabbadoz.net/freebsd/lor.html lock order reversal: 1st 0xffffff0001696098 ufs (ufs) @ /mnt/disk2/usr/src/sys/kern/vfs_lookup.c:501 2nd 0xffffff8026d985b8 bufwait (bufwait) @ /mnt/disk2/usr/src/sys/ufs/ffs/ffs_softdep.c:11309 3rd 0xffffff0001705638 ufs (ufs) @ /mnt/disk2/usr/src/sys/kern/vfs_subr.c:2111 KDB: stack backtrace: db_trace_self_wrapper() at 0xffffffff801cae5a = db_trace_self_wrapper+0x2a _witness_debugger() at 0xffffffff802ba265 = _witness_debugger+0x65 witness_checkorder() at 0xffffffff802bb513 = witness_checkorder+0x833 __lockmgr_args() at 0xffffffff8025efad = __lockmgr_args+0xd4d ffs_lock() at 0xffffffff8041a9af = ffs_lock+0x8f VOP_LOCK1_APV() at 0xffffffff804ab13b = VOP_LOCK1_APV+0x9b _vn_lock() at 0xffffffff80313c67 = _vn_lock+0x57 vget() at 0xffffffff8030775b = vget+0x7b vfs_hash_get() at 0xffffffff802fb065 = vfs_hash_get+0xd5 ffs_vgetf() at 0xffffffff80415ca8 = ffs_vgetf+0x48 softdep_sync_metadata() at 0xffffffff8041309e = softdep_sync_metadata+0x5de ffs_syncvnode() at 0xffffffff8041a65a = ffs_syncvnode+0x22a ffs_truncate() at 0xffffffff803fac38 = ffs_truncate+0x408 ufs_direnter() at 0xffffffff8042284d = ufs_direnter+0x6fd ufs_makeinode() at 0xffffffff80427a74 = ufs_makeinode+0x254 VOP_CREATE_APV() at 0xffffffff804abaad = VOP_CREATE_APV+0x8d vn_open_cred() at 0xffffffff80313642 = vn_open_cred+0x452 kern_openat() at 0xffffffff803126f1 = kern_openat+0x181 syscallenter() at 0xffffffff802b274a = syscallenter+0x1aa syscall() at 0xffffffff8046dfac = syscall+0x4c Xfast_syscall() at 0xffffffff8045a332 = Xfast_syscall+0xe2 --- syscall (5, FreeBSD ELF64, open), rip = 0x800726ddc, rsp = 0x7fffffffeac8, rbp = 0 --- b.
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