From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Vladimir V. Saveliev" <vs@namesys.com>
Subject: Re: another warning
Date: Thu, 18 Aug 2005 14:05:48 +0400
Message-ID: <43045D7C.6070907@namesys.com>
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To: Danny <dannydaemonic@gmail.com>
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Hello

Danny wrote:
> A couple days ago I got another warning.  This one sounds more
> serious, and I'm not low on free space anymore.
> 
> Aug 16 20:21:18 [kernel] reiser4[mount(16045)]: _init_read_super
> (fs/reiser4/init_super.c:180)[nikita-2608]:
> Aug 16 20:21:18 [kernel] WARNING: loop0: wrong master super block magic.
> 
> Bad magic number?  Does that mean something important was overwritten?
> 

This looks like it tried to mount loop0 device as reiser4 and the device was not formatted as reiser4.