This part is repeating in the syslog every several minutes:
[425954.573268] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[425954.573274] ata1.00: ST_FIRST: !(DRQ|ERR|DF)
[425954.573285] ata1.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
[425954.573286] cdb 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[425954.573288] res 50/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x2 (HSM
violation)
[425954.573292] ata1.00: status: { DRDY }
[425954.573322] ata1: soft resetting link
[425954.822733] ata1.00: configured for UDMA/33
[425954.835217] ata1: EH complete
The machine freezes at that times.
PS acpi=off in the grup.
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strange messages "ata3.00: exception Emask (HSM violation)"
https://bugs.launchpad.net/bugs/163637
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