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Date:      Thu, 15 Jan 1998 21:32:05 -0800 (PST)
From:      sherwink@ix.netcom.com
To:        freebsd-gnats-submit@FreeBSD.ORG
Subject:   kern/5508: SCSI Message sd0: COMMAND FAILED (4 28) @f04e1000 during make buildworld
Message-ID:  <199801160532.VAA27190@hub.freebsd.org>

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>Number:         5508
>Category:       kern
>Synopsis:       SCSI Message sd0: COMMAND FAILED (4 28) @f04e1000 during make buildworld
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 15 21:40:01 PST 1998
>Last-Modified:
>Originator:     Sherwin Kaplan
>Organization:
>Release:        2.2.5 Stable as of 11/29/97
>Environment:
FreeBSD bookend.ix.netcom.com 2.2.5-STABLE FreeBSD 2.2.5-STABLE #0: 
Wed Jan 14 05:07:17 PST 1998     
sherwin@bookend.ix.netcom.com:/usr/src/sys/compile/SHERWIN  i386
>Description:
Approximately one hour into a "make buildworld", I received the 
following messages:

Jan 13 23:49:11 bookend /kernel: assertion "cp" failed: file "../../pci/ncr.c", 
line 6191
Jan 13 23:49:12 bookend /kernel: sd0(ncr0:0:0): COMMAND FAILED (4 28) @f05c8800.
Jan 13 23:49:12 bookend /kernel: assertion "cp" failed: file "../../pci/ncr.c", 
line 6191
Jan 13 23:49:12 bookend /kernel: sd0(ncr0:0:0): COMMAND FAILED (4 28) @f05c8800.

The same messages were also displayed during "make buildworld" using
both 3.0 Current 01/01/98 and 01/08/98, on the same machine, using 
a different slice of the same disk. In the case of the 01/01/98 system,
there were 33 sets of messages, in the case of the 01/08/98 system,
there were 3 sets of messages. 

The messages above are from the make of the 2.2.5-STABLE shown in the 
Environment box, running on the old 2.2.5-STABLE of 11/29/97. I have 
not tried running a make using this 2.2.5-STABLE of 01/14/98 system.

The one time that I actually saw the messages displayed, instead of
seeing them after the fact in /var/log/messages, there was very intense
disk activity.

Hardware is:

Pentium Pro 150
Intel Venus Motherboard
32 MB memory
Symbios 53c825
Quantum Atlas II, 2.2 GB Ultra SCSI

>How-To-Repeat:
Run a "make buildworld", it has happened 3 out of 3 times. The disk
does pass a fsck, and the code generated does seem to work properly.
>Fix:
None Known.

The error appears to indicate a ccb queue full, but I am not clear from
looking at the code of ncr.c, as to why this occurs. Is this a problem
with the code, or is my disk failing to respond? I am also not clear as
to whether the command is retried. The application may retry, the SCSI
code appears not to retry.

I would appreciate any advice.



>Audit-Trail:
>Unformatted:



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