Re: [9fans] fossil/venti falling down?

[John Floren <slawmaster@gmail.com>]

On Thu, Jun 18, 2009 at 10:10 AM, John Floren<slawmaster@gmail.com> wrote:
> On Thu, Jun 18, 2009 at 9:45 AM, erik quanstrom <quanstro@quanstro.net> wrote:
>>
>> > It seems to only happen once per boot, but not necessarily when fossil
>> > starts responding--I've seen it a couple hours after booting, which
>> > the filesystem tends to go away at night.
>>
>> the failure is somewhere in blockWrite.  since blockWrite
>> calls diskWrite and diskWrite just queues up i/o to send
>> to the disk, it's not possible to get i/o errors directly from
>> blockWrite.
>>
>> there are two case that do return errors.
>>
>> one is if the block can't be locked.  a runaway periodic function
>> would make that more likely, since we don't wait for the lock.
>> but it seems more likely in this case that some of fossil's data is
>> corrupted since this started after the double-failure.
>> see http://9fans.net/archive/2009/03/487
>>
>> the other case is a funny dependency.  there's a fprint there
>> that's commented out.
>>
>> - erik
>>
>
> Here's another message that may be of interest. I ran fshalt before
> rebooting (to test the periodicthread patch) and saw this:
>
> syncing.../srv/fscons...prompt: sourceRoot: fs->ehi = 5395, b->l =
> BtDir,3,Copied,e=5394,-1,tag=0x1
> venti...
> halting.../srv/fscons...archive vac:a9d9b0b9fe0db783fe618f680804a18df532a67a
>
> I don't remember seeing that "sourceRoot: ..." stuff before; as soon
> as the system comes back up I guess I'll take a look at source.
>

After replacing the problematic server and moving the fossil disk to
the new machine, we're not getting random hangs any more.

However, I've seen this a few times on the console:

/boot/fossil: cacheLocalData: addr=78989 type got 0 exp 0: tag got
e63eb942 exp 663eb942
archive(0, 0x1348d): cannot find block: block label mismatch

and

 /boot/fossil: cacheLocalData: addr=134772 type got 0 exp 0: tag got
7795335e exp 7715335e

is this something to worry about?

John
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