From owner-freebsd-scsi  Fri Apr  4 16:06:56 1997
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Date: Thu, 3 Apr 1997 20:34:51 +0200
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From: wcp@luppolo.lpds.sublink.org (Walter C. Pelissero)
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To: freebsd-scsi@freebsd.org
Subject: bus device reset
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Sorry for the ignorance, but what is going wrong when this message
come up?

Apr  3 20:24:58 luppolo /kernel: ahc0: target 0, lun 0 (sd0) timed out
Apr  3 20:24:58 luppolo /kernel: sd0(ahc0:0:0): BUS DEVICE RESET message queued.
Apr  3 20:24:58 luppolo /kernel: sd0(ahc0:0:0): UNIT ATTENTION asc:29,0
Apr  3 20:24:58 luppolo /kernel: sd0(ahc0:0:0):  Power on, reset, or bus device reset occurred
Apr  3 20:24:58 luppolo /kernel: , retries:4

This on FreeBSD 2.1.0-RELEASE, a 1GB Quantum Fireball (sd0) and an
Adaptec 2940.