linux-kernel - Re: linux-next: Tree for Jan 20 -- Kernel panic

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Message-ID: <20150121110539.GA8924@kria>
Date:	Wed, 21 Jan 2015 12:05:39 +0100
From:	Sabrina Dubroca <sd@...asysnail.net>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Guenter Roeck <linux@...ck-us.net>, Paul Moore <pmoore@...hat.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-audit@...hat.com,
	Richard Guy Briggs <rgb@...hat.com>
Subject: Re: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount
 root fs

2015-01-21, 04:36:38 +0000, Al Viro wrote:
> On Tue, Jan 20, 2015 at 08:01:26PM -0800, Guenter Roeck wrote:
> > With this patch:
> > 
> > sys_mkdir .:40775 returned -17
> > sys_mkdir usr:40775 returned 0
> > sys_mkdir usr/lib:40775 returned 0
> > sys_mkdir usr/share:40755 returned 0
> > sys_mkdir usr/share/udhcpc:40755 returned 0
> > sys_mkdir usr/bin:40775 returned 0
> > sys_mkdir usr/sbin:40775 returned 0
> > sys_mkdir mnt:40775 returned 0
> > sys_mkdir proc:40775 returned 0
> > sys_mkdir root:40775 returned 0
> > sys_mkdir lib:40775 returned 0
> > sys_mkdir lib/modules:40775 returned 0
> > ...
> > 
> > and the problem is fixed.

This patch also works for me.


> ... except that it simply confirms that something's fishy with getname_kernel()
> of ->name of struct filename returned by getname().  IOW, I still do not
> understand the mechanism of breakage there.

I'm not so sure about that.  I tried to copy name to a new string in
do_path_lookup and that didn't help.

Now, I've removed the

        putname(filename);

line from do_path_lookup and I don't get the panic.


And BTW, I added Guenter's debugging to init/initramfs.c and got:
sys_mkdir dev:40755 returned 0
sys_mkdir root:40700 returned 0

even if it ends up panic'ing.

-- 
Sabrina
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