"panic: snapblkfree: inconsistent block type" on FreeBSD 9.0 RELEASE

[Ronald Klop]

On Sun, 03 Jun 2012 20:08:07 +0200, José García Juanino  
<jjuanino at gmail.com> wrote:

> On 3 June 2012 14:16, José García Juanino <jjuanino at gmail.com> wrote:
>> Hi,
>>
>> I am getting a lot of "snapblkfree: inconsistent block type" panics on
>> my FreeBSD 9.0-RELEASE. My file systems have not any inconsistencies,
>> I am checked them with fsck. But I have some snapshots with softupdate
>> inconsistencies  (fsck_ffs /path/to/snapshot), and I suspect that may
>> be the cause of the panics. I have several questions:
>>
>> 1- Snapshots with fsck inconsistencies might be the cause of my panics?
>> 2- Should I remove any of such "corrupt" snapshots?
>>
>> If someone is interested, I can provide a full backtrace. Kernel is
>> GENERIC, with no tweaks. File system are been created with normal
>> "newfs -U". No special setting is using.
>
> I have three full core dumps:
>
> http://www.mipaginapersonal.movistar.es/web3/jjuanino/core.txt.1
> http://www.mipaginapersonal.movistar.es/web3/jjuanino/core.txt.2
> http://www.mipaginapersonal.movistar.es/web3/jjuanino/core.txt.3
>
> The relevant code is, in the three examples:
>
> #3  0xffffffff80a40124 in ffs_snapblkfree (fs=0xfffffe0002deb000,
> devvp=Variable "devvp" is not available.
> )
>     at /usr/src/sys/ufs/ffs/ffs_snapshot.c:1799
>
> Regards

I don't know about the internals of FFS, but I know there were some fixes  
to FFS + snapshots ( + journal (SUJ) ??) after 9.0-RELEASE. So maybe you  
can test updating to and running with 9-STABLE.

Ronald.