Re: panic: ffs_blkfree: freeing free block

  Hello, I apply the patch 
(http://www.googlebit.com/freebsd/patches/ffs_softdep.c-patch) but I got 
the panic again. (with portsnap update)

How can I help for this bug (?) fixed?
Thanks,
Javier

FreeBSD odin 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #0: Sat Oct 13 
15:42:34 ART 2007

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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conditions.
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This GDB was configured as "i386-marcel-freebsd".

Unread portion of the kernel message buffer:
dev = ad4s1f, block = 5515224, fs = /usr
panic: ffs_blkfree: freeing free block
KDB: stack backtrace:
db_trace_self_wrapper(c0a5d4aa,d301aad0,c0787e3a,c0a5b8b4,c0b59b40,...) 
at db_trace_self_wrapper+0x26
kdb_backtrace(c0a5b8b4,c0b59b40,c0a6c5bb,d301aadc,d301aadc,...) at 
kdb_backtrace+0x29
panic(c0a6c5bb,c2cc2b78,5427d8,0,c2d528d4,...) at panic+0xaa
ffs_blkfree(c2db3a00,c2d52800,c2d76bb0,5427d8,0,...) at ffs_blkfree+0x433
indir_trunc(0,c,0,d301ac4c,c1455718,...) at indir_trunc+0x3a8
handle_workitem_freeblocks(0,d301ac84,2,c07b5200,c2d2e210,...) at 
handle_workitem_freeblocks+0x1e0
process_worklist_item(d301acc8,c07fe20e,c2d3b538,2001,c2d3b568,...) at 
process_worklist_item+0x22e
softdep_process_worklist(c2d3b538,0,c0b5eae0,c2d2e210,3e8,...) at 
softdep_process_worklist+0x81
softdep_flush(0,d301ad38,c9e1dfe1,a9fd7d80,262e286a,...) at 
softdep_flush+0x46a
fork_exit(c08f7d70,0,d301ad38) at fork_exit+0x94
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xd301ad70, ebp = 0 ---
Uptime: 1d15h29m16s
Physical memory: 435 MB
Dumping 121 MB: (CTRL-C to abort)  106 90 74 58 42 26 10


> On Sunday 14 October 2007, Eric Anderson wrote:
>> Pieter de Goeje wrote:
>>> On Saturday 13 October 2007, Rolf Witt wrote:
>>>> Backtrace from crash tonight (after portsnap cron):
>>> <snip>
>>>
>>>> # uname -a
>>>> FreeBSD peanuts.homenet.local 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE
>>>> #121: Thu Oct 11 16:29:05 CEST 2007
>>>> rowi_at_peanuts.homenet.local:/usr/obj/usr/src/sys/PEANUTS  i386
>>>>
>>>> Sources from Builddate.
>>>>
>>>> Rowi
>>> Eric sent me this patch:
>>> http://www.googlebit.com/freebsd/patches/ffs_softdep.c-patch
>>> which seems to be working great so far. I am still testing it, but I
>>> think it fixed the problem.
>>> To apply, cd /usr/src; patch < /path/to/patch and then rebuild the
>>> kernel.
>>>
>>> Cheers,
>>> Pieter de Goeje
>> It doesn't actually 'fix' the problem, but I think it helps identify it.
>> I'm not 100% certain if this is the right fix our not, but so far
>> feedback has been good when running with this patch.
>>
>> Can somebody confirm that this patch is ok?
>>
>> Eric
> Can you elaborate on what this patch exactly does / what the problem is?
> 
> Pieter
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