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Timeout when all partitions are readonly

daemon@ATHENA.MIT.EDU (Keith Owens)
Sat Nov 1 22:33:55 1997

From: Keith Owens <kaos@ocs.com.au>
To: linux-scsi@vger.rutgers.edu
Date: 	Sun, 02 Nov 1997 14:31:19 +1100

To speed up some kernel testing, all partitions on sdb were mounted
readonly in fstab, to speed up fsck after hang.  This showed up a
strange timeout on the readonly disk.  Doing cd to one particular
directory on sdb3 or cd to another sdb3 directory followed by ls would
always result in the following

scsi : aborting command due to timeout : pid 2379, scsi0, channel 0, id 2, lun 0 Read (10) 00 00 24 25 f8 00 00 04 00 
ncr53c8xx_abort: pid=2379 serial_number=2399 serial_number_at_timeout=2399

I'm pretty sure this is a software bug, even though it looks like
hardware.  badblocks (read only) says that the entire disk is clean.
e2fsck -f /dev/sdb3 is clean.  The error only appears once per boot,
thereafter all operations on sdb are clean.  If any sdb partition is
mounted readwrite in fstab then the problem does not occur at all, it
does not even have to be sdb3 that is mounted readwrite.

Currently on 2.1.59-VGER-vanilla-CVS971020 with a local patch to modify
the order of scanning for SCSI controllers (NCR before Adaptec).  The
problem can be duplicated on stock 2.1.42 (no local patches).  I cannot
reproduce the problem on stock 2.0.31.  All SMP.

dmesg, df, mount, .config in attached file, tgz to save space.

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`
end



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