I've noticed this as of late on my i386 -CURRENT Thinkpad T43 when I
perform some file operations, but an exact reproduction case I've not
yet stumbled upon:
Apr 20 01:29:32 lemon kernel: lock order reversal:
Apr 20 01:29:32 lemon kernel: 1st 0xc5832358 bufwait (bufwait) @
/usr/home/tyler/source/github/freebsd/sys/kern/vfs_bio.c:3081
Apr 20 01:29:32 lemon kernel: 2nd 0xc6f1d600 dirhash (dirhash) @
/usr/home/tyler/source/github/freebsd/sys/ufs/ufs/ufs_dirhash.c:284
Apr 20 01:29:32 lemon kernel: KDB: stack backtrace:
Apr 20 01:29:32 lemon kernel:
db_trace_self_wrapper(c115aa9d,79732f64,66752f73,66752f73,66752f73,...)
at db_trace_self_wrapper+0x2d/frame 0xe93ba918
Apr 20 01:29:32 lemon kernel:
kdb_backtrace(c115e882,c6f1d600,c1192fe7,c5dae950,c1192c15,...) at
kdb_backtrace+0x30/frame 0xe93ba980
Apr 20 01:29:32 lemon kernel:
witness_checkorder(c6f1d600,9,c1192c15,11c,0,...) at
witness_checkorder+0xd04/frame 0xe93ba9cc
Apr 20 01:29:32 lemon kernel:
_sx_xlock(c6f1d600,0,c1192c15,11c,c5832300,...) at _sx_xlock+0x75/frame
0xe93ba9fc
Apr 20 01:29:32 lemon kernel:
ufsdirhash_remove(c6c26bc8,db6e02fc,2fc,e93baa58,e93baa54,...) at
ufsdirhash_remove+0x37/frame 0xe93baa24
Apr 20 01:29:32 lemon kernel:
ufs_dirremove(c6c1f238,c73c0d98,400800c,0,c6c1f238,...) at
ufs_dirremove+0x12c/frame 0xe93baa68
Apr 20 01:29:32 lemon kernel:
ufs_remove(e93bac00,c11683ae,a8b,e93babfc,0,...) at
ufs_remove+0x76/frame 0xe93baaac
Apr 20 01:29:32 lemon kernel:
VOP_REMOVE_APV(c13e8d1c,e93bac00,c73c2e6c,e93babd4,81a5b18,...) at
VOP_REMOVE_APV+0xfe/frame 0xe93baad8
Apr 20 01:29:32 lemon kernel:
kern_unlinkat(c6958000,ffffff9c,81a5b18,0,0) at
kern_unlinkat+0x27a/frame 0xe93bac24
Apr 20 01:29:32 lemon kernel:
sys_unlink(c6958000,e93bacc8,c0feeaef,c1c25c90,0,...) at
sys_unlink+0x32/frame 0xe93bac40
Apr 20 01:29:32 lemon kernel: syscall(e93bad08) at syscall+0x30c/frame
0xe93bacfc
Apr 20 01:29:32 lemon kernel: Xint0x80_syscall() at
Xint0x80_syscall+0x21/frame 0xe93bacfc
Apr 20 01:29:32 lemon kernel: --- syscall (10, FreeBSD ELF32,
sys_unlink), eip = 0x2848bd37, esp = 0xbfbfd1bc, ebp = 0xbfbfd248 ---
Apr 20 01:29:54 lemon kernel: lock order reversal:
Apr 20 01:29:54 lemon kernel: 1st 0xc699e388 ufs (ufs) @
/usr/home/tyler/source/github/freebsd/sys/kern/vfs_subr.c:2101
Apr 20 01:29:54 lemon kernel: 2nd 0xc5859e98 bufwait (bufwait) @
/usr/home/tyler/source/github/freebsd/sys/ufs/ffs/ffs_vnops.c:262
Apr 20 01:29:54 lemon kernel: 3rd 0xc7d27c68 ufs (ufs) @
/usr/home/tyler/source/github/freebsd/sys/kern/vfs_subr.c:2101
Apr 20 01:29:54 lemon kernel: KDB: stack backtrace:
Apr 20 01:29:54 lemon kernel:
db_trace_self_wrapper(c115aa9d,762f6e72,735f7366,2e726275,31323a63,...)
at db_trace_self_wrapper+0x2d/frame 0xe93ba260
Apr 20 01:29:54 lemon kernel:
kdb_backtrace(c115e89b,c7d27c68,c1144d4e,c5dae8e8,c11683ae,...) at
kdb_backtrace+0x30/frame 0xe93ba2c4
Apr 20 01:29:54 lemon kernel:
witness_checkorder(c7d27c68,9,c11683ae,835,c7d27c88,...) at
witness_checkorder+0xd04/frame 0xe93ba310
Apr 20 01:29:54 lemon kernel:
__lockmgr_args(c7d27c68,80100,c7d27c88,0,0,...) at
__lockmgr_args+0x8f3/frame 0xe93ba3f0
Apr 20 01:29:54 lemon kernel:
ffs_lock(e93ba470,c116537f,c5d8d110,c5d93840,c5d8d110,...) at
ffs_lock+0x87/frame 0xe93ba42c
Apr 20 01:29:54 lemon kernel:
VOP_LOCK1_APV(c13e8d1c,e93ba470,c116537f,227,c13fe1f0,...) at
VOP_LOCK1_APV+0x10a/frame 0xe93ba458
Apr 20 01:29:54 lemon kernel:
_vn_lock(c7d27c34,80100,c11683ae,835,c11675a0,...) at
Apr 20 01:29:54 lemon kernel: _vn_lock+0xa6/frame 0xe93ba498
Apr 20 01:29:54 lemon kernel: vget(c7d27c34,80100,c6958000,57,0,...) at
vget+0x74/frame 0xe93ba4d0
Apr 20 01:29:54 lemon kernel:
vfs_hash_get(c63fad20,70aa44,80000,c6958000,e93ba5d0,...) at
vfs_hash_get+0xfc/frame 0xe93ba4fc
Apr 20 01:29:54 lemon kernel:
ffs_vgetf(c63fad20,70aa44,80000,e93ba5d0,1,...) at ffs_vgetf+0x44/frame
0xe93ba558
Apr 20 01:29:54 lemon kernel:
softdep_sync_buf(c699e354,c5859e40,1,0,0,...) at
softdep_sync_buf+0xbdf/frame 0xe93ba5e8
Apr 20 01:29:54 lemon kernel: ffs_syncvnode(c699e354,1,0,c13c3cdc,0,...)
at ffs_syncvnode+0x2dd/frame 0xe93ba640
Apr 20 01:29:54 lemon kernel:
ffs_truncate(c699e354,200,0,880,c5ed0300,...) at
ffs_truncate+0x6eb/frame 0xe93ba
Apr 20 01:29:54 lemon kernel: 7f0
Apr 20 01:29:54 lemon kernel:
ufs_direnter(c699e354,c7d27c34,e93ba8b8,e93babcc,0,...) at
ufs_direnter+0x79e/fra
Apr 20 01:29:54 lemon kernel: me 0xe93ba870
Apr 20 01:29:54 lemon kernel: ufs_makeinode(e93babb8,e93babcc) at
Apr 20 01:29:54 lemon kernel: ufs_makeinode+0x534/frame 0xe93ba9f0
Apr 20 01:29:54 lemon kernel:
ufs_create(e93baad8,614,c63fad30,2,c63fad74,...) at
Apr 20 01:29:54 lemon kernel: ufs_create+0x2f/frame 0xe93baa04
Apr 20 01:29:54 lemon kernel:
VOP_CREATE_APV(c13e8d1c,e93baad8,e93babcc,e93baa68,c0acc930,...) at
VOP_CREATE_APV+0xfe/frame 0xe93baa30
Apr 20 01:29:55 lemon kernel:
vn_open_cred(e93bab70,e93babfc,180,0,c5ed0300,c6960118) at
vn_open_cred+0x2f0/frame 0xe93bab00
Apr 20 01:29:55 lemon kernel:
vn_open(e93bab70,e93babfc,180,c6960118,bfbfe843,...) at
vn_open+0x3d/frame 0xe93bab28
Apr 20 01:29:55 lemon kernel:
kern_openat(c6958000,ffffff9c,bfbfe843,0,a01,180) at
kern_openat+0x310/frame 0xe93bac1c
Apr 20 01:29:55 lemon kernel:
sys_open(c6958000,e93bacc8,c131d50a,d5,0,...) at sys_open+0x39/frame
0xe93bac40
Apr 20 01:29:55 lemon kernel: syscall(e93bad08) at syscall+0x30c/frame
0xe93bacfc
Apr 20 01:29:55 lemon kernel: Xint0x80_syscall() at
Xint0x80_syscall+0x21/frame 0xe93bacfc
Apr 20 01:29:55 lemon kernel: --- syscall (5, FreeBSD ELF32, sys_open),
eip = 0x282b7dc3, esp = 0xbfbfe3c4, ebp = 0xbfbfe
Apr 20 01:29:55 lemon kernel: c58 ---
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