Comment 6 for bug 422994

Stefan, thanks for your answer. I can now confirm that with kernel 2.6.31-020631-generic the problem remains. I tried to copy the problematic folder tree twice, once there was only a freeze and no entry the syslog, the next time I saw after the freeze the known kernel entry:
Sep 19 22:07:01 server01 kernel: [86345.385651] ata3.00: exception Emask 0x12 SAct 0x0 SErr 0x1000500 action 0x6
Sep 19 22:07:01 server01 kernel: [86345.385718] ata3.00: BMDMA stat 0x5
Sep 19 22:07:01 server01 kernel: [86345.385759] ata3: SError: { UnrecovData Proto TrStaTrns }
Sep 19 22:07:01 server01 kernel: [86345.385841] ata3.00: cmd 25/00:60:bd:ad:41/00:00:1a:00:00/e0 tag 0 dma 49152 in
Sep 19 22:07:01 server01 kernel: [86345.385852] res 51/84:1f:fe:ad:41/84:00:1a:00:00/e0 Emask 0x12 (ATA bus error)
Sep 19 22:07:01 server01 kernel: [86345.385939] ata3.00: status: { DRDY ERR }
Sep 19 22:07:01 server01 kernel: [86345.385987] ata3.00: error: { ICRC ABRT }
Sep 19 22:07:01 server01 kernel: [86345.386068] ata3: hard resetting link
Sep 19 22:07:01 server01 kernel: [86345.702931] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
Sep 19 22:07:01 server01 kernel: [86345.736757] ata3.00: configured for UDMA/133
Sep 19 22:07:01 server01 kernel: [86345.736821] ata3: EH complete
If you have any other test-scenariofor me I will of course try ..., thanks for your help.