panic in ATA (atacontrol reinit ata2)

[Mikhail Teterin]

Hello!

I can reinit the ata0 (no devices) and ata1 (a single DVD drive) without any 
problems -- they are both IDE (PATA).

Reinit-ing ata2 (with one SATA drive) hangs the machine solid. Most of the 
time...

This one time, however, it paniced and dumped core instead of hanging. Here is 
the debugging session (something is wrong with most of the stack):

	http://aldan.algebra.com/~mi/ata-crash-kgdb.txt

Let me know, if you need the contents of other variables...

I'm using 6.2-STABLE/amd64 as of March 2nd on a quad-core Opteron system with 
4Gb of RAM.

The system and home drives are SCSI, but this 500Gb one is where I keep my 
backups, pictures, and videos... The drive has recently developed a nasty 
habit of detaching (maybe, due to heat?) -- but interrogating it with 
smartmontools does not show any errors... Either way, the kernel is not 
supposed to panic -- there is not even any swap on the drive.

Thanks!

	-mi