panic arose about an hour ago...
a whole directory tree was suddenly gone and every try to access it resulted
in an i/o error

the log shows this:

[53933.922000] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[53933.926000] ata1.00: configured for UDMA/100
[53934.007000] SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
[53934.014000] sda: Write Protect is off
[53934.014000] sda: Mode Sense: 00 3a 00 00
[53934.022000] SCSI device sda: drive cache: write back
[54316.760000] ReiserFS: warning: is_tree_node: node level 0 does not match to the expected one 1
[54316.760000] ReiserFS: sda8: warning: vs-5150: search_by_key: invalid format found in block 2326540. Fsck?
[54316.760000] ReiserFS: sda8: warning: zam-7001: io error in reiserfs_find_entry
[54341.302000] ReiserFS: warning: is_tree_node: node level 0 does not match to the expected one 1
[54341.302000] ReiserFS: sda8: warning: vs-5150: search_by_key: invalid format found in block 2326540. Fsck?
[54369.880000] ReiserFS: warning: is_tree_node: node level 0 does not match to the expected one 1
[54369.880000] ReiserFS: sda8: warning: vs-5150: search_by_key: invalid format found in block 2326540. Fsck?
[54505.683000] ReiserFS: warning: is_tree_node: node level 0 does not match to the expected one 1
[54505.683000] ReiserFS: sda8: warning: vs-5150: search_by_key: invalid format found in block 2326540. Fsck?

a reboot into maintainance mode and fsck of the partition brought the dir
back without data loss (pffffew!)

but I am still concerned, what has happened here?

a grep on my syslogs revealed quite a few similar warnings which I obviously
diden't notice. - attached wich a few lines of context

see http://www.lorenz.eu.org/~mlo/kernel/?C=M;O=D for more


gruss
  mlo
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Dipl.-Ing. Martin Lorenz

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