Subject: File Corruption
To: None <netbsd-bugs@NetBSD.ORG>
From: Ed Gould <>
List: netbsd-bugs
Date: 07/17/1998 17:39:32
Has anyone seen the following symptoms?  It has been suggested to me that the 
ncr driver is weak, and that it may be the cause of this problem.


	DEC Venturis GL 6200 (Pentium Pro, 200MHz)
	144 MB RAM
	NetBSD 1.3.1
	ncr0: Diamond Fireport 40 (53C875J)
	    sd0: Quantum Fireball TM2110S (slow narrow)
	    sd1: IBM DCAS-32160W (ultra wide)
	    sd2: Micropolis 3391SS (ultra wide)
	aha0: Adaptec 1542
	    st0: tape
	    cd0 - cd6: CDROM changer
	(some other hopefully irrelevant stuff)

Problem:  When I do

	cd old
	tar cf - . | (cd ../old; tar xpf -)

with both the "old" and "new" directories in a FFS partition of sd2, some of 
the files in "new" get corrupted.  In the two files I examined, the corruption 
was either 8KB or 16KB, contiguous, starting on an 8K boundary.  The 
filesystem blocksize is 8KB.

Has this appeared before?  Any thoughts?  (Don't just say "run 1.3.2."  I was 
cloning my source tree to upgrade it to 1.3.2 when I saw the problem.)