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https://issues.apache.org/jira/browse/SVN-4722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16405572#comment-16405572
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Melissa Mears commented on SVN-4722:
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Hi. I was the original reporter of this. I've confirmed that the 1826272
commit gets past the two errors we were having.
The problem occurred twice in a project with 615,000 revisions and 20 years of
code history (Visual SourceSafe -> CVS -> Subversion in 2005). Only one of
these occurred during 1.9.x's lifetime, leading to finding the bug. The other
occurred when retroactively processing old revisions in 1.9.x via "svnsync". I
guess that's one anecdote for measuring the rarity of the bug.
Thanks for fixing this!
> checksum fail during commit when delta is 16K
> ---------------------------------------------
>
> Key: SVN-4722
> URL: https://issues.apache.org/jira/browse/SVN-4722
> Project: Subversion
> Issue Type: Bug
> Components: libsvn_fs_fs
> Affects Versions: 1.9.7
> Reporter: Philip Martin
> Priority: Major
>
> As discussed
> _Email to dev@, from Philip Martin, 2018-03-03, "Re: SHA-1 collision in
> repository?", archived at
> [mail-archives.apache.org|https://mail-archives.apache.org/mod_mbox/subversion-dev/201803.mbox/%3C87lgf3fda2.fsf%40codematters.co.uk%3E],
> [svn.haxx.se|https://svn.haxx.se/dev/archive-2018-03/0070.shtml]_
> There is an error in the checksum code added to 1.9.7 to detect SHA1
> collisions. The expanded length is calculated incorrectly and when the delta
> length is a multiple of 16K the checksum calculation stops early and fails.
> Symptom: Commits fail with a false "Filesystem is corrupt" error.
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