Check was perfomed from Debian Squeeze. Even if I explicitly write -o create=ccreg40,compress=lzo1,cluster=4K,compressMode=ultim the only difference is that there is no segfault.
user@debian:~$ su Password: root@debian:/home/user# fsck.reiser4 --fix /dev/sda2 ******************************************************************* This is an EXPERIMENTAL version of fsck.reiser4. Read README first. ******************************************************************* Fscking the /dev/sda2 block device. Will fix minor corruptions of the Reiser4 SuperBlock. Will fix minor corruptions of the Reiser4 FileSystem. Continue? (Yes/No): Y ***** fsck.reiser4 started at Sat Aug 21 12:54:11 2010 Reiser4 fs was detected on /dev/sda2. Master super block (16): magic: ReIsEr4 blksize: 4096 format: 0x0 (format40) uuid: 970f9e8b-5e34-4052-945c-c245235668f7 label: <none> Format super block (17): plugin: format40 description: Disk-format plugin. version: 0 magic: ReIsEr40FoRmAt mkfs id: 0x17d2a916 flushes: 0 blocks: 2621440 free blocks: 1696203 root block: 2285025 tail policy: 0x2 (smart) next oid: 0x34b539 file count: 313544 tree height: 5 key policy: LARGE CHECKING THE STORAGE TREE Read nodes 925124 Nodes left in the tree 925124 Leaves of them 913586, Twigs of them 11302 Time interval: Sat Aug 21 12:54:13 2010 - Sat Aug 21 12:57:18 2010 CHECKING EXTENT REGIONS. Read twigs 11302 Time interval: Sat Aug 21 12:57:18 2010 - Sat Aug 21 12:58:25 2010 CHECKING THE SEMANTIC TREE FSCK: /build/buildd-reiser4progs_1.0.7-6-i386-x3Vc4F/reiser4progs-1.0.7/plugin/object/ccreg40/ccreg40_repair.c: 77: ccreg40_check_item: The file [18dac:2e626173685f68:49ca3] (ccreg40), node [62428], item [9]: item of the wrong cluster size (-2147483648) found, Should be (4096). Fixed. Segmentation fault root@debian:/home/user#