kern/155125: triple LOR in mkdir

[Robert Schulze]

>Number:         155125
>Category:       kern
>Synopsis:       triple LOR in mkdir
>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:   Mon Feb 28 14:50:10 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Robert Schulze
>Release:        8.2-PRERELEASE
>Organization:
>Environment:
FreeBSD xxxxx 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #5: Thu Feb 24 14:54:06 CET 2011     root at xxxxx:/usr/obj/usr/src/sys/BAK  amd64
>Description:
lock order reversal:
 1st 0xffffff0045766308 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2130
 2nd 0xffffff81efade078 bufwait (bufwait) @ /usr/src/sys/ufs/ffs/ffs_softdep.c:6193
 3rd 0xffffff015d7b9308 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2130
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kdb_backtrace() at kdb_backtrace+0x37
_witness_debugger() at _witness_debugger+0x49
witness_checkorder() at witness_checkorder+0x7d3
__lockmgr_args() at __lockmgr_args+0xd0b
ffs_lock() at ffs_lock+0xac
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
_vn_lock() at _vn_lock+0x5d
vget() at vget+0x6c
vfs_hash_get() at vfs_hash_get+0xd1
ffs_vgetf() at ffs_vgetf+0x3d
softdep_sync_metadata() at softdep_sync_metadata+0x43d
ffs_syncvnode() at ffs_syncvnode+0x228
ffs_truncate() at ffs_truncate+0x37b
ufs_direnter() at ufs_direnter+0x712
ufs_mkdir() at ufs_mkdir+0x426
VOP_MKDIR_APV() at VOP_MKDIR_APV+0xb9
kern_mkdirat() at kern_mkdirat+0x25c
syscallenter() at syscallenter+0xe5
syscall() at syscall+0x55
Xfast_syscall() at Xfast_syscall+0xe2
--- syscall (136, FreeBSD ELF64, mkdir), rip = 0x80072250c, rsp = 0x7fffffffe5f8, rbp = 0x7fffffffea11 ---

>How-To-Repeat:

>Fix:


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