kern/132960: panic:ffs_blkfree: freeing free frag

[kevin]

>Number:         132960
>Category:       kern
>Synopsis:       panic:ffs_blkfree: freeing free frag
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 23 08:40:02 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     kevin
>Release:        8.0 current
>Organization:
163.org
>Environment:
FreeBSD kevin-laptop.people.163.org 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Sun Mar 15 21:11:36 CST 2009 root at kevin-laptop.people.163.org:/usr/obj/usr/src/sys/G8laptop amd64
>Description:
dev = ad4s1a, block = 846584, fs = /
panic: ffs_blkfree: freeing free flag
cpuid = 0
KDB: enter: panic

db>bt
Tracing pid 1515 tif 100202 td 0xffffff011a290700
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x176
ffs_blkfree() at ffs_blkfree+0x699
ffs_truncate() at ffs_truncate+0x9db
ufs_rmdir() at ufs_rmdir+0x1af
VOP_RMDIR_APV() at VOP_RMDIR_APV+0x34
kern_rmdirat() at kern_rmdirat+0x2a5
syscall() at syscall+0x255
Xfast_syscall() at Xfast_syscall+0xab
--- syscall(137,FreeBSD ELF64,rmdir), rip = 0x801044e5c, rsp = 0x7fffffffa528, rbp = 0x5122c0 ---

>How-To-Repeat:
Unknow
system panic when zpool export backup
>Fix:


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