DB_PAGE_NOTFOUND: Requested page not found

hello,

something is wrong with my repository :( i haven't used it for 2 months or
so and now wanted to upgrade to 0.31. knowing that i will need to dump the
0.26 repository database, because the schema changed, i realized that it is
somehow broken.

this is how it reacts (using subversion 0.26 and libdb4.1):

- svn list file:///var/lib/svn/repos/trunk/libdelvepp *works*
  svn list does always work!

- svn cat anyfile *works always*

- svn co file:///var/lib/svn/repos/trunk/libdelvepp *fails*
  creates the error message:

  svn: Berkeley DB error
  svn: Berkeley DB error while creating change for filesystem
  /var/lib/svn/repos/db:
  DB_PAGE_NOTFOUND: Requested page not found

- svnadmin dump /var/lib/svn/repos *fails*
  creates the error message:

  SVN-fs-dump-format-version: 2
  ...
  [some dump stuff]
  ...
  PROPS-END

  svn: Berkeley DB error
  svn: Berkeley DB error while fetching changes for filesystem
 /var/lib/svn/repos/db:
  DB_PAGE_NOTFOUND: Requested page not found

i already tried to debug this problem a little with sussman over irc.
additional info is:

- svn client software is all 0.26
- berkleyDB is 4.1.25
- i already ran svnadmin recover a couple of times. the error message
didn't disappear. i searched the mailing-list archive before and had the
impression from another thread that it might be an update from berkleydb4
to 4.1 which is incompatible or so. but obviously the upgrade is already
done with svnadmin recover as sussmann told me.
- /var/lib/svn/repos/format is "1"
- there exists a file named "changes" in /var/lib/svn/repos/db
- all actions i did were all local (with file:///) and with root at the
moment. so there isn't a protocol or permissions problem.

i'd really like to rescue the repository somehow as i put some work in it
(especially concerning the ignore properties) i really wouldn't want to do
again ;-) any help is greatly appreciated!! thanks!

-- 
Benjamin Zeiss
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