Re: panic: ffs_blkfree: freeing free block

Here the backtrace from the last panic:

# kgdb kernel.debug /var/crash/vmcore.0
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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Unread portion of the kernel message buffer:
dev = ad4s1f, block = 26012752, fs = /usr
panic: ffs_blkfree: freeing free block
Uptime: 1d5h6m39s
Physical memory: 631 MB
Dumping 152 MB: 137 121 105 89 73 57 41 25 9

#0  doadump () at pcpu.h:195
195             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) backtrace
#0  doadump () at pcpu.h:195
#1  0xc06328d3 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0632ad4 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc07d48f0 in ffs_blkfree (ump=0xc323ab00, fs=0xc321c800,
    devvp=0xc328add0, bno=26012752, size=16384, inum=6506870)
    at /usr/src/sys/ufs/ffs/ffs_alloc.c:1893
#4  0xc07e8168 in indir_trunc (freeblks=0xc3c1bd00, dbn=103948864, level=0,
    lbn=12, countp=0xd9177c4c) at /usr/src/sys/ufs/ffs/ffs_softdep.c:2896
#5  0xc07e8430 in handle_workitem_freeblocks (freeblks=0xc3c1bd00, flags=0)
    at /usr/src/sys/ufs/ffs/ffs_softdep.c:2746
#6  0xc07e9cb8 in process_worklist_item (mp=0xc324b7d4, flags=Variable
"flags" is not available.
)
    at /usr/src/sys/ufs/ffs/ffs_softdep.c:963
#7  0xc07ead71 in softdep_process_worklist (mp=0xc324b7d4, full=0)
    at /usr/src/sys/ufs/ffs/ffs_softdep.c:847
#8  0xc07ed2ea in softdep_flush () at /usr/src/sys/ufs/ffs/ffs_softdep.c:758
#9  0xc0612211 in fork_exit (callout=0xc07ece70 <softdep_flush>, arg=0x0,
    frame=0xd9177d38) at /usr/src/sys/kern/kern_fork.c:796
#10 0xc084fd50 in fork_trampoline () at
/usr/src/sys/i386/i386/exception.s:205
(kgdb)


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