amd64/135124: lor vfs_bio/ufs_dirhash

[Randy Bush]

>Number:         135124
>Category:       amd64
>Synopsis:       lor vfs_bio/ufs_dirhash
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jun 01 00:20:00 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Randy Bush
>Release:        8-CURRENT Sun May 31 22:52:41 UTC 2009
>Organization:
Internet Initiative Japan
>Environment:
FreeBSD work0.psg.com 8.0-CURRENT FreeBSD 8.0-CURRENT #3: Sun May 31 22:52:41 UTC 2009     root at work0.psg.com:/usr/obj/usr/src/sys/WORK0  amd64
>Description:
lock order reversal:
 1st 0xffffff8052aba050 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2556
 2nd 0xffffff0004f53000 dirhash (dirhash) @ /usr/src/sys/ufs/ufs/ufs_dirhash.c:275
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+0x88b
ufs_makeinode() at ufs_makeinode+0x31c
VOP_CREATE_APV() at VOP_CREATE_APV+0xb1
vn_open_cred() at vn_open_cred+0x3fd
kern_openat() at kern_openat+0x159
syscall() at syscall+0x1dd
Xfast_syscall() at Xfast_syscall+0xd0
--- syscall (5, FreeBSD ELF64, open), rip = 0x800c0bfcc, rsp = 0x7fffffffe6f8, rbp = 0x7fffffffe860 ---

i think this may be different than 261
<http://sources.zabbadoz.net/freebsd/lor/261.html>

>How-To-Repeat:

>Fix:


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