From owner-aic7xxx  Sat Apr 17 10: 5:24 1999
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To: linux-scsi@vger.rutgers.edu, AIC7xxx@FreeBSD.ORG
Subject: Kernel freeze
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From: Stephan Loescher <loescher@leo.org>
Date:	17 Apr 1999 17:01:17 +0000
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Hi!

I have the following problem with kernel 2.2.6:
When I copy a lot of large files from my harddisk (IBM DCAS-34330W) to
my magneto-optical (MO) drive, then after some time (5 seconds to
several minutes) the Linux kernel stops. The system is freezed and the
SCSI-bus led, the MO-led and the harddisk-led is lighting. I canīt log
into my system. Mouse and keyboard are "dead".
The source- and target-filesystems are ext2.

I have tried 2.2-kernels since 2.2.2 with and without all AC-patches.
I have also tried the 5.1.14-aic7xxx-driver.
Also disabling all aic7xxx-features does not help.
I tried these options:
aic7xxx=verbose, aic7xxx=pci_parity, aic7xxx=verbose:0x1ffff
and disabled TAGGED_QUEUEING at all.

I can copy files between all my harddisks without any error.

I can reproduce this behaviour.

With kernel 2.0.33 there are no problems!

My system:
Pentium-200
SCSI-HA: Adaptec 3490U
MO: Olympus Deltis-320 at ID0 on channel A (scsi0)
Harddisks:
Seagte ST32430N, IBM DCAS-34330, IBM DCAS-34330W on channel B (scsi1)
Others: SONY CDROM CDU-76S, TANDBERG NS20 Pro on channel B (scsi1) and
HP ScanJet on channel A (scsi0)

What was changed in the SCSI-code in the kernel since 2.0.33?
Or is the bug located in the aic7xxx-code?
Could it be a problem with the two SCSI-channels on the 3940U?
Is it perhaps a PCI-problem with the PCI-PCI-bridge on the 3940U?
Or is the bug located somwhere else? (ext2, buffer-cache,
memory-management, ...)

What can I do to help finding the bug?
(linux/Documentation/BUG-HUNTING seems impossible to me, because there
are so much versions between 2.0.33 and 2.2.x.)

Stephan.

-- 
loescher@leo.org
http://www.leo.org/~loescher/
Try the LEO-archive: http://www.leo.org/archiv/archiv_e.html


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