[Bug 654163] Re: computer freeze on disc operation with very large files/amounts of blocks

[Holger H.]

While today it froze again during SATA access (a mac synced it's
timemachine backup via SMB), I reviewed again some log files and this
time found something interesting: The SATA RAID array is syncing in the
background.

The system worked stable for half a year. And then, this happened:

Oct  3 00:57:01 hhtpc CRON[8078]: (root) CMD ([ -x /usr/share/mdadm/checkarray ] && [ $(date +%d) -le 7 ] && /usr/share/mdadm/checkarray --cron --all --quiet)
Oct  3 00:57:01 hhtpc mdadm[1743]: RebuildStarted event detected on md device /dev/md0

This was exactly the event when the trouble started and the system
freezes sometimes during SATA accesses.

I now have the "theory" that the freeze occurs if I start the backup
from the SATA RAID array to another SATA/PATA drive while the RAID sync
is running, or vice vera. I'll check this out ...

What happened on 3. oct? I applied some ubuntu updates. I rebooted.

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computer freeze on disc operation with very large files/amounts of blocks
https://bugs.launchpad.net/bugs/654163
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