panic: ffs_blkfree: freeing free frag

Hello all.

I just powered the box on, logged in as a root, cvsuped to the today's
-CURRENT and then I ran:

cd /usr/obj
chflags -R noschg *
rm -rf *
cd /usr/src
rehash
w

Then I wanted to run 'make buildworld' but before I hit the [Enter] key
the system is paniced:

dev = ad0s1f, block = 850900, fs = /usr
panic: ffs_blkfree: freeing free frag
cpuid = 0;
KBD: enter: panic
[thread 100053]
Stoped at       kbd_enter+0x2b: nop
db> trace
kbd_enter(c07eff7e) at kbd_enter+0x2b
panic(c080417d,c080413d,c13c97a4,cfbd4,0) at panic+0x131
ffs_blkfree(c13b0800,14a9840,cfbd0,0,2800) at ffs_blkfree+0x45a
handle_workitem_freeblocks(c1dd3400,0) at
handle_workitem_freeblocks+0x278
process_worklist_item(0,0) at process_worklist_item+0x1a0
softdep_process_worklist(0) at softdep_process_worklist+0xc4
sched_sync(0,c812bd48,0,c064cfbc,0) at sched_sync+0x41a
fork_exit(c064cfbc,0,c812bd48) at fork_exit+0xa4
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xc812bd7c, ebp = 0 ---
db> 


This is:
$ uname -a
FreeBSD localhost 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Sat Aug 14
04:10:43 IDT 2004     root_at_localhost:/usr/obj/usr/src/sys/GENERIC  i386


		
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