kern/152741: [lor] vfs_bio.c / ufs_dirhash.c

[Olivier Cochard-Labbé]

>Number:         152741
>Category:       kern
>Synopsis:       [lor] vfs_bio.c / ufs_dirhash.c
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Dec 01 13:20:08 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Olivier Cochard-Labbé
>Release:        8.1
>Organization:
>Environment:
FreeBSD d630.bsdrp.net 8.1-RELEASE-p2 FreeBSD 8.1-RELEASE-p2 #8: Wed Dec  1 11:25:17 CET 2010     root at d630.bsdrp.net:/usr/obj/usr/src/sys/DellD630  amd64

>Description:
My dmesg show me this lor:

lock order reversal:
 1st 0xffffff8029423328 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2559
 2nd 0xffffff000192b800 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+0x2e
witness_checkorder() at witness_checkorder+0x81e
_sx_xlock() at _sx_xlock+0x55
ufsdirhash_acquire() at ufsdirhash_acquire+0x33
ufsdirhash_add() at ufsdirhash_add+0x19
ufs_direnter() at ufs_direnter+0x889
ufs_mkdir() at ufs_mkdir+0x42d
VOP_MKDIR_APV() at VOP_MKDIR_APV+0x93
kern_mkdirat() at kern_mkdirat+0x20e
syscall() at syscall+0x2c2
Xfast_syscall() at Xfast_syscall+0xe1
--- syscall (136, FreeBSD ELF64, mkdir), rip = 0x80072c14c, rsp = 0x7fffffffe7c8, rbp = 0x800a04050 ---


>How-To-Repeat:
Each boot.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: