[jira] [Created] (SVN-4858) FSFS corruption - Found malformed header - Corrupt node-revision

["Julian Foad (Jira)" <ji...@apache.org>]

Julian Foad created SVN-4858:
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             Summary: FSFS corruption - Found malformed header - Corrupt node-revision
                 Key: SVN-4858
                 URL: https://issues.apache.org/jira/browse/SVN-4858
             Project: Subversion
          Issue Type: Bug
            Reporter: Julian Foad


This issue exists to document a form of repository corruption that has been seen "in the wild".

The following error was seen by a WANdisco customer at the time of calling the FS layer commit-txn API via WANdisco's own replicator product:
{code:none}
160004 Found malformed header '2-8080.0-58760.r87127/41271' in revision file
160004 Corrupt node-revision '2-8080.0-58760.r87127/41275'
{code}
I can artificially create a repository corruption that produces that exact form of error, in a 1.6-compatible repository served by svn 1.10. By my analysis the error almost certainly resulted from this kind of corruption.

The essence of the corruption is: within a directory representation, in either a 'dir' entry or a 'file' entry, add 4 to the byte-offset part of the entry's node-rev reference.

The observed failure was in a FSFS repo format 5, filesystem format 4, shard size 1000, 60 shards packed; the error reported references r87127 so is in a non-packed revision.

 



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