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From: =?ISO-8859-1?Q?Sven_K=F6hler?= <skoehler@upb.de>
Subject: Re: [BUG] null-pointer deref (perhaps reiserfs3)
Date: Mon, 06 Dec 2004 17:35:11 +0100
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> on a machine that i can only reach via SSH at the moment, i got a 
> null-pointer dereference (see below). The machine runs kernel 2.6.9 
> without any additional patches.
> 
> It happened, while i was doing a "make install". A command within the 
> "installkernel"-script segfaulted. It seems that only the filesystem 
> mounted to /boot is affected. Any access to that FS blocks.

Here's how to reproduce it:

dd if=/dev/zero of=image bs=1M count=40
mkreiserfs -f image
mount -o loop image /mnt/test
cp -r /etc/ /mnt/test

The kernel will Oops, and cp will segfault.

After that, umount -r /mnt/test will fail or block.
The computer will not reboot or halt.