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Date: Wed, 5 Mar 1997 10:26:33 -0700 (MST)
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From: Nathan Torkington <gnat@frii.com>
To: freebsd-questions@freebsd.org
Subject: 2.1.5->2.1.7 causes SCSI errors?
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Our news machine worked just fine under 2.1.5, but barfed miserably
when upgraded to 2.1.7.  It reboots about every 20 minutes now.

The kernel probe finds the disks:
kernel: ahc0 <Adaptec 2940 SCSI host adapter> rev 3 int a irq 11 on pci0:12
kernel: ahc0: aic7870 Single Channel, SCSI Id=7, 16 SCBs
kernel: ahc0 waiting for scsi devices to settle
kernel: (ahc0:0:0): "SEAGATE ST32430N 0510" type 0 fixed SCSI 2
kernel: sd0(ahc0:0:0): Direct-Access 2049MB (4197405 512 byte sectors)
kernel: (ahc0:1:0): "SEAGATE ST32430N 0510" type 0 fixed SCSI 2
kernel: sd1(ahc0:1:0): Direct-Access 2049MB (4197405 512 byte sectors)
kernel: (ahc0:2:0): "SEAGATE ST32430N 0510" type 0 fixed SCSI 2
kernel: sd2(ahc0:2:0): Direct-Access 2049MB (4197405 512 byte sectors)
kernel: (ahc0:3:0): "SEAGATE ST32430N 0510" type 0 fixed SCSI 2
kernel: sd3(ahc0:3:0): Direct-Access 2049MB (4197405 512 byte sectors)
kernel: (ahc0:4:0): "QUANTUM XP34300 F81H" type 0 fixed SCSI 2
kernel: sd4(ahc0:4:0): Direct-Access 4101MB (8399520 512 byte sectors)

The messages we get before reboots are:

kernel: sd4(ahc0:4:0): timed out while idle, LASTPHASE == 0x1, SCSISIGI == 0x0
kernel: SEQADDR == 0x8
kernel: panic: ahc0: Timed-out command times out again
kernel: 
kernel: syncing disks... 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 giving up
kernel: Automatic reboot in 15 seconds - press a key on the console to abort
kernel: Rebooting...

That disk is part of a large CCD device:
ccd0            32      0       /dev/sd1s1 /dev/sd2s1 /dev/sd3s1 /dev/sd4s1

I copied the old kernel configuration file from 2.1.5 to 2.1.7 and
built and installed it without complaints.  I couldn't find anything
in the 2.1.7 LINT file to suggest that the format of the SCSI device
specification has significantly changed between 2.1.5 and 2.1.7.  We
haven't seen this behaviour on any of our other 5 servers which I
upgraded at the same time and in the same manner (the others don't
have ccd or the Quantum drive).

What did I do wrong and (more importantly) what do I do to fix it?

Thanks,

Nat
(I'm not a list subscriber, just someone who is following the kernel's
instructions and is panicking, so please CC: gnat@frii.com on your
replies)