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Date: Tue, 21 Oct 2008 09:17:16 +0200
From: Thomas Quinot <thomas@FreeBSD.ORG>
To: Ben Kaduk <minimarmot@gmail.com>
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Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: delayed panic loading atapicam (after failed burncd)
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* Ben Kaduk, 2008-10-21 :

> # kldload atapicam
> acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00
> cd0 at ata1 bus 0 target 0 lun 0
> cd0: <HL-DT-ST RW/DVD MU10N 1.05> Removable CD-ROM SCSI-0 device
> cd0: 3.3000MB/s transfers
> cd0: Attempt to query device size failed: NOT READY, Medium not present

Looks good. After that point device cd0 does exist, right?

> warm boot (no acd0 found):
> # kldload atapicam
> [nothing]

If there's no acd0 that indicates that the ATA layer does not see the
drive so it's not completely unepected that ATAPI/CAM, which sits on top
of ATA, doesn't see it either.
 
> cold boot:
> 
> # kldload atapicam
> acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00
> cd0: at ata1 bus 0 target 0 lun 0
> cd0: <HL-DT-ST RW/DVD MU10N 1.05> Removable CD-ROM SCSI-0 device
> cd0: 3.300MB/s transfers
> cd0: cd present [3778x2048 byte records]
> acd0: FAILURE - READ_BIG ILLIGAL REQUEST asc=0x64 ascq=0x00
> (cd0:ata1:0:0:0): READ(10). CDB: 28 0 0 0 e c1 0 0 1 0
> (cd0:ata1:0:0:0): CAM Status: SCSI Status Error
> (cd0:ata1:0:0:0): SCSI Status: Check Condition
> (cd0:ata1:0:0:0): ILLEGAL REQUEST asc:64,0
> (cd0:ata1:0:0:0): Illegal mode for this track
> (cd0:ata1:0:0:0): Unretryable error
> (cd0:ata1:0:0:0): cddone got error 0x6 back
> [no panic]

Does cd0 exist at this point?

> warm boot:
> # kldload atapicam
> [nothing happens]

Same as above.

For the case of the unit disappearing at warm reboot, it would be
interesting to have a complete transcript of a verbose boot (boot -v).
To avoid copying everything by hand, you can hook a serial console to
your machine and log the messages on a second machine.

> I don't have the media that was causing the panic here at home; I'll
> try to test that tomorrow and see if the panic
> is gone with the new snapshot.

OK, thanks, let me know.

Thomas.