Kernel bug or disk failure

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Every other week or so, I get a disk kicked out of my RAID, with this:

Jul 6 04:05:38 commodore kernel: (scsi1:A:0:0): scsi1: device overrun (status 10) on 0:0:0 Jul 6 04:05:38 commodore kernel: Unexpected busfree in DT Data-in phase, 1 SCBs aborted, PRGMCNT == 0x22f Jul 6 04:05:38 commodore kernel: >>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<< Jul 6 04:05:38 commodore kernel: scsi1: Dumping Card State at program address 0x22d Mode 0x22
Jul  6 04:05:38 commodore kernel: Card was paused

… followed by a rather dry dump of the HBA's registers. This is aic79xxx.

This does not look like a disk error to me. I re-add the drive into the array, and rebuild with no downtime. SMART shows 0 in the defect list on this drive, and over the disk's lifetime 0 uncorrectable reads and 1 uncorrectable write -- but this kernel barf already happened 4-5 times now, and it's getting rather annoying.

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