Date: Wed, 08 Dec 1999 21:12:50 -0800 From: Ben Speirs <igiveup@ix.netcom.com> To: The Hermit Hacker <scrappy@hub.org> Cc: freebsd-scsi@freebsd.org, freebsd-stable@freebsd.org Subject: Re: SCSI problem ... OS or just bus? Message-ID: <384F3A52.23868C19@ix.netcom.com> References: <Pine.BSF.4.21.9912082301270.500-100000@thelab.hub.org>
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The Hermit Hacker wrote:
>
> I recently did two upgrades in the course of a few days...upgraded my
> 3.3-STABLE to a more recent version, and added hard drives onto the
> system...now I'm getting SCSI problems that make no sense :(
>
> The machine just hung once more, which its doing every few hours...I can
> get down to the debugger, but a 'trace' doesn't appear to show anyting, so
> I panic...
>
> ==========
> (da4:ahc0:0:8:0): Other SCB Timeout
> (da4:ahc0:0:8:0): SCB 0xeb - timed out in dataout phase, SEQADDR == 0x10f
> (da4:ahc0:0:8:0): Other SCB Timeout
> (da2:ahc0:0:5:0): SCB 0x24 - timed out in dataout phase, SEQADDR == 0x10f
> (da2:ahc0:0:5:0): BDR message in message buffer
> (da2:ahc0:0:5:0): SCB 0x92 - timed out in dataout phase, SEQADDR == 0x10f
> (da2:ahc0:0:5:0): no longer in timeout, status = 34b
> ahc0: Issued Channel A Bus Reset. 98 SCBs aborted
Just another data point - A similar thing happened to me. I rebuilt the
kernel and world back in September and my previously happy SCSI system
started issuing the same type of messages. I saved the output of the
system log. Portions of it are listed below:
Copyright (c) 1992-1999 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights
reserved.
FreeBSD 3.3-STABLE #3: Fri Sep 24 21:00:39 PDT 1999
root@sloth:/usr/src/sys/compile/SLOTH
[...trim...]
ahc0: <Adaptec 2940 Ultra SCSI adapter> rev 0x00 int a irq 9 on pci0.9.0
ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs
[...trim...]
Waiting 8 seconds for SCSI devices to settle
changing root device to da0s3a
da0 at ahc0 bus 0 target 15 lun 0
da0: <FUJITSU M2954Q-512 0142> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing
Enabled
da0: 4149MB (8498506 512 byte sectors: 255H 63S/T 529C)
cd0 at ahc0 bus 0 target 0 lun 0
cd0: <TOSHIBA CD-ROM XM-5701TA 3136> Removable CD-ROM SCSI-2 device
cd0: 10.000MB/s transfers (10.000MHz, offset 8)
cd0: Attempt to query device size failed: NOT READY, Medium not present
cd1 at ahc0 bus 0 target 1 lun 0
cd1: <NEC CD-ROM DRIVE:500 2.5> Removable CD-ROM SCSI-2 device
cd1: 3.300MB/s transfers
cd1: Attempt to query device size failed: NOT READY, Medium not present
Unexpected busfree. LASTPHASE == 0x1
SEQADDR == 0x153
ahc0:A:0: no active SCB for reconnecting target - issuing BUS DEVICE
RESET
SAVED_TCL == 0x0, ARG_1 == 0xff, SEQ_FLAGS == 0x0
(cd0:ahc0:0:0:0): SCB 0x16 - timed out in datain phase, SEQADDR == 0x153
(cd0:ahc0:0:0:0): Other SCB Timeout
(da0:ahc0:0:15:0): SCB 0x3 - timed out in datain phase, SEQADDR == 0x153
(da0:ahc0:0:15:0): BDR message in message buffer
(da0:ahc0:0:15:0): SCB 0x3 - timed out in datain phase, SEQADDR == 0x153
(da0:ahc0:0:15:0): no longer in timeout, status = 34b
ahc0: Issued Channel A Bus Reset. 2 SCBs aborted
fd0c: hard error reading fsbn 0 (No status)
The problem occurred while accessing the da0 device and cd0 device at
the same time. I could reproduce it at will, and almost instantly by
copying a file from the CD-ROM to the hard drive. I could not reproduce
the error with the older, slower NEC cd1 CD-ROM device. I rechecked all
my termination and unplugged one device after another without any
success. My guess was that the cd0 drive had gone goofy on me. The
only thing I have not tried is replacing the cables. Since I had the
other CD available my fix was to yank out the suspect device. It has
been near the bottom of my 'things to do' list.
Maybe we both got bit by the same "fix" that uncovered hidden hardware
problems. Maybe not, it looks like you have problems with only Wide
channel devices.
--
-Ben Speirs
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