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RE: svnsync checksum error

From: Edward Ned Harvey <svn_at_nedharvey.com>
Date: Wed, 10 Nov 2010 20:55:49 -0500

> From: Stefan Sperling [mailto:stsp_at_elego.de]
> > It's 100% consistent. I get the same checksum error, on the same file,
> every time. I have a supposed "good" copy of the slave repo, at rev
> which will fail every time at 4061 (or something like that)... The only
> explanation I can find is a md5sum collision going undetected, and then
> larger operation has an md5sum which fails as a result. I know it's
> astronomically impossible, but I can't come up with any other explanation.
> So you can reproduce it reliably? That's very interesting.
> I'd like to try to debug this. If it's possible to arrange access to your
> data please contact me off-list. Thanks.

I believe we found the cause for mine. It was hardware error, which was
introduced silently into rev 4390 of my repo. But I can't speak for the
other folks here... If they're having bugs, they might have bugs.

One quick question though: If the system is calculating checksums,
shouldn't it store the checksums for future reference? I find it very
surprising that I can run "svnadmin verify" and no errors are detected, yet
svnsync dies with a md5sum mismatch. Maybe the md5sums are only used
transiently and only by svnsync?
Received on 2010-11-11 02:56:36 CET

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