From owner-freebsd-bugs  Thu Feb  7 14:20: 9 2002
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From: Michael Vasilenko <acid@dg.net.ua>
Subject: Re: kern/34613: kernel panic in ufsdirhash_lookup 
Reply-To: Michael Vasilenko <acid@dg.net.ua>
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The following reply was made to PR kern/34613; it has been noted by GNATS.

From: Michael Vasilenko <acid@dg.net.ua>
To: David Malone <dwmalone@maths.tcd.ie>
Cc: <FreeBSD-gnats-submit@freebsd.org>
Subject: Re: kern/34613: kernel panic in ufsdirhash_lookup 
Date: Fri, 8 Feb 2002 00:18:55 +0200 (EET)

 On Mon, 4 Feb 2002, David Malone wrote:
 
 DM> > DM> If it does look like random bit flips then we'll have to figure out
 DM> > DM> if it is a software or hardware problem.
 DM>
 DM> > 000042cc  72 2e 70 6e 67 00 00 00  21 60 1b 00 1c 00 08 11  |r.png...!`......|
 DM> > 000042dc  75 6e 69 76 2d 64 61 79  2e 70 6e 67 2e 6d 65 74  |univ-day.png.met|
 DM> > 000042ec  61 00 35 cc 22 60 1b 00  1c 00 08 12 75 6e 69 76  |a.5."`......univ|
 DM> > 000042fc  2d 77 65 65 6b 2e 70 6e  67 2e 6d 65 74 61 00 cc  |-week.png.meta..|
 DM> > 0000430c  23 60 1b 00 1c 00 08 13  75 6e 69 76 2d 6d 6f 6e  |#`......univ-mon|
 DM> > 0000431c  74 68 2e 70 6e 67 2e 6d  65 74 61 00 24 60 1b 00  |th.png.meta.$`..|
 DM>
 DM> Definitely a bitfilp. See the line which starts 0000430c, there are
 DM> 4 bytes for the inode number, 2 bytes for the record length, 1 for
 DM> the file type and 1 for the name length and then the name dirhash
 DM> was looking for. We're almost certainly looking at a case of dirhash
 DM> writing the correct offset in and then something corrupting it by
 DM> flipping a bit.
 
 Thank you, it's really was hardware problem (bad memory chip), you may
 close my second case too.
 
 -- 
 Michael Vasilenko
 

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