kern/132664: [lor] vfs_mount.c / msdosfs_vfsops.c

[Rene Ladan]

>Number:         132664
>Category:       kern
>Synopsis:       [lor] vfs_mount.c / msdosfs_vfsops.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:   Sun Mar 15 16:20:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Rene Ladan
>Release:        8.0-CURRENT i386 r187684
>Organization:
>Environment:
>Description:
The LOR report might be outdated by now.
Hardware is an Asus Eee901

LOR:

lock order reversal:
 1st 0xc45f2df4 ufs (ufs) @ /usr/head/src/sys/kern/vfs_mount.c:1190
 2nd 0xc4992ad0 devfs (devfs) @ /usr/head/src/sys/fs/msdosfs/msdosfs_vfsops.c:934
KDB: stack backtrace:
db_trace_self_wrapper(c09125b0,e67b8a4c,c060e925,4,c090da7d,...) at db_trace_self_wrapper+0x26
kdb_backtrace(4,c090da7d,c411cd48,c411cc78,e67b8aa8,...) at kdb_backtrace+0x29
_witness_debugger(c0915309,c4992ad0,c0904524,c411cc78,c0904db9,...) at _witness_debugger+0x25
witness_checkorder(c4992ad0,9,c0904db9,3a6,c4992aec,...) at witness_checkorder+0x839
__lockmgr_args(c4992ad0,80400,c4992aec,0,0,...) at __lockmgr_args+0x797
vop_stdlock(e67b8bb0,c0af2948,c48eebe4,80400,c4992a78,...) at vop_stdlock+0x62
VOP_LOCK1_APV(c09604c0,e67b8bb0,e67b8bd0,c099b100,c4992a78,...) at VOP_LOCK1_APV+0xb5
_vn_lock(c4992a78,80400,c0904db9,3a6,c4550780,...) at _vn_lock+0x5e
msdosfs_sync(c4550780,1,c48eeb40,4eb,1,...) at msdosfs_sync+0x28c
dounmount(c4550780,8000000,c48eeb40,471,6,...) at dounmount+0x45c
unmount(c48eeb40,e67b8cf8,8,c,c0963970,...) at unmount+0x2e0
syscall(e67b8d38) at syscall+0x2a3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (22, FreeBSD ELF32, unmount), eip = 0x280d226f, esp = 0xbfbfe54c, ebp = 0xbfbfe618 ---

>How-To-Repeat:

>Fix:


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