dev = da0s1d, block = 40949944, fs = /export/b1
panic: ffs_blkfree: freeing free block
cpuid = 0
KDB: enter: panic
[thread 100112]
Stopped at      kdb_enter+0x30: leave
db> wh
kdb_enter(c066992d,0,c0672f0b,e4ba6ae0,5) at kdb_enter+0x30                     panic(c0672f0b,c22ae8a8,270d8b8,0,c23bf8d4) at panic+0x13e
ffs_blkfree(c23bf800,c233d108,270d8b8,0,4000) at ffs_blkfree+0x3d2              indir_trunc(c2f4c800,9c35e60,0,1,80c) at indir_trunc+0x30d
handle_workitem_freeblocks(c2f4c800,0,2,6,0) at handle_workitem_freeblocks+0x20e
process_worklist_item(0,0,4293dace,0,0) at process_worklist_item+0x1e1          softdep_process_worklist(0,1e,c1f1a320,0,0) at softdep_process_worklist+0xcc
sched_sync(0,e4ba6d48,0,0,0) at sched_sync+0x5f2
fork_exit(c0541295,0,e4ba6d48) at fork_exit+0x80                                fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xe4ba6d7c, ebp = 0 ---