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FSFS corruption on the rise...

From: John Szakmeister <john_at_szakmeister.net>
Date: 2006-10-09 12:06:53 CEST

Hello all,

I just wanted to put out there that the number of FSFS corruption cases I'm seeing has been increasing. I can't really say by how much, but it seems like a new one is popping up every couple of weeks, whereas it was months between before. The more serious issue is that I'm now seeing cases where there is a large swath of zeros being written into the file. The block size has varied, but it's always on a 4K boundary--just like the repeated block corruption. For instance, one file had 40K worth of zeros written into the front of the file. It seems to be very similar to the repeated block corruption, except this one appears to be destructive (I can't find the original data anywhere). I've also had one person claim that they caused their corruption to happen via svnserve. :-( The number of downloads for fsfsverify has jumped as well. I'm seeing roughly 20 a month, and generally only one of those makes it to the list, so I don't whether they had an issue and fixed it, or if they were just looking at the to
ol. Also, I've had several people report the corruption with APR >=0.9.7, so the issue is definitely not limited to those running <=0.9.6.

Only one person has been able to reproduce the corruption. They used tc to disrupt the network, and that seemed to trigger the issue. I tried doing the same with a couple machines at home, and was unsuccessful at reproducing the issue.

I wish I could be more involved with a solution--I've been swamped at home and at work, and just can't break away. However, I thought the community should at least know about what I'm seeing. I can try and dig up more details (I generally save all the corruption email messages) if someone needs it.

Thanks for listening!

-John

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Received on Mon Oct 9 12:07:45 2006

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