Error "svn: Can't open file '/svn/mpfr/db/txn-current-lock': Permission denied"

After a repository upgrade with svn version 1.5.1 (r32289) a few days
ago, we now get the following error when committing:

svn: Can't open file '/svn/mpfr/db/txn-current-lock': Permission denied

No problems for read operations.

The DB FS type is FSFS, and we have:

vlefevre_at_ff-scm-prod:~$ ls -l /svnroot/mpfr/db
total 468
-rw-rw-r-- 1 www-data scm_mpfr 11 Aug 5 02:26 current
-r--r--r-- 1 www-data scm_mpfr 15 Aug 6 16:01 format
-rw-r--r-- 1 www-data scm_mpfr 5 Oct 24 2005 fs-type
drwxrwsr-x 2 www-data scm_mpfr 4096 Aug 6 16:02 node-origins
drwxrwsr-x 2 www-data scm_mpfr 229376 Aug 5 02:26 revprops
drwxrwsr-x 2 www-data scm_mpfr 229376 Aug 5 02:26 revs
drwxrwsr-x 2 www-data scm_mpfr 4096 Aug 5 02:26 transactions
-rw-r--r-- 1 www-data scm_mpfr 2 Aug 6 16:01 txn-current
-rw-r--r-- 1 www-data scm_mpfr 0 Aug 6 16:01 txn-current-lock
drwxr-sr-x 2 www-data scm_mpfr 4096 Aug 6 16:01 txn-protorevs
-rw-r--r-- 1 www-data scm_mpfr 37 Oct 24 2005 uuid
-rw-rw-r-- 1 www-data scm_mpfr 0 Oct 24 2005 write-lock
vlefevre_at_ff-scm-prod:~$ ls -l /svnroot/mpfr/db/txn-protorevs/
total 0
vlefevre_at_ff-scm-prod:~$ svnadmin lslocks /svnroot/mpfr
vlefevre_at_ff-scm-prod:~$ svnadmin lstxns /svnroot/mpfr
vlefevre_at_ff-scm-prod:~$

The other repositories on the server do not have these txn-*
files/directory. Any idea?

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)