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From: Wojciech Puchar <wojtek@puchar.net>
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To: FreeBSD Hackers <freebsd-hackers@freebsd.org>
Subject: freebsd crash under I/O - got error messages part 2
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after rebooting, without even loading vboxdrv.ko, quickly after running 
svnlite checkout

Dec  7 21:23:21 laptop kernel: lock order reversal:
Dec  7 21:23:21 laptop kernel: 1st 0xfffffe0060f7fdd8 bufwait (bufwait) @ 
kern/vfs_bio.c:3061
Dec  7 21:23:21 laptop kernel: 2nd 0xfffff8001a555600 dirhash (dirhash) @ 
ufs/ufs/ufs_dirhash.c:284
Dec  7 21:23:21 laptop kernel: KDB: stack backtrace:
Dec  7 21:23:21 laptop kernel: db_trace_self_wrapper() at 
db_trace_self_wrapper+0x2b/frame 0xfffffe0078702440
Dec  7 21:23:21 laptop kernel: kdb_backtrace() at kdb_backtrace+0x39/frame 
0xfffffe00787024f0
Dec  7 21:23:21 laptop kernel: witness_checkorder() at 
witness_checkorder+0xdc2/frame 0xfffffe0078702580
Dec  7 21:23:21 laptop kernel: _sx_xlock() at _sx_xlock+0x71/frame 
0xfffffe00787025c0
Dec  7 21:23:21 laptop kernel: ufsdirhash_add() at 
ufsdirhash_add+0x3a/frame 0xfffffe0078702600
Dec  7 21:23:21 laptop kernel: ufs_direnter() at ufs_direnter+0x6b3/frame 
0xfffffe00787026c0
Dec  7 21:23:21 laptop kernel: ufs_mkdir() at ufs_mkdir+0x4d0/frame 
0xfffffe0078702850
Dec  7 21:23:21 laptop kernel: VOP_MKDIR_APV() at VOP_MKDIR_APV+0xd1/frame 
0xfffffe0078702880
Dec  7 21:23:21 laptop kernel: kern_mkdirat() at kern_mkdirat+0x1be/frame 
0xfffffe0078702aa0
Dec  7 21:23:21 laptop kernel: amd64_syscall() at 
amd64_syscall+0x216/frame 0xfffffe0078702bb0
Dec  7 21:23:21 laptop kernel: Xfast_syscall() at Xfast_syscall+0xfb/frame 
0xfffffe0078702bb0
Dec  7 21:23:21 laptop kernel: --- syscall (136, FreeBSD ELF64, 
sys_mkdir), rip = 0x801d4e93a, rsp = 0x7fffffffde68, rbp = 0x7fffffffde8