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

     [ https://issues.apache.org/jira/browse/SVN-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Foad updated SVN-4858:
-----------------------------
    Description: 
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, in standard Subversion. 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.

 

  was:
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.

 


> 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
>            Priority: Major
>         Attachments: test-svn-4858-6.tgz
>
>
> 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, in standard Subversion. 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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