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

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Message-ID: <54BFE713.20807@roeck-us.net>
Date:	Wed, 21 Jan 2015 09:51:15 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Al Viro <viro@...IV.linux.org.uk>, Paul Moore <pmoore@...hat.com>
CC:	Sabrina Dubroca <sd@...asysnail.net>,
	Thierry Reding <thierry.reding@...il.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

On 01/21/2015 09:38 AM, Al Viro wrote:
> On Wed, Jan 21, 2015 at 11:16:23AM -0500, Paul Moore wrote:
>> On Wednesday, January 21, 2015 04:54:07 PM Sabrina Dubroca wrote:
>>> 2015-01-21, 16:39:12 +0100, Thierry Reding wrote:
>>>> That doesn't seem to help, at least in my case.
>>>
>>> Same here.
>>
>> Okay, thanks for trying.  Sorry that didn't resolve things.
>>
>>> Well, it's probably not an audit issue.  I tried audit=0 on the
>>> commandline, and I just rebuilt a kernel with CONFIG_AUDIT=n, and it's
>>> still panicing.  This should have fixed any audit-related issue,
>>> right?
>>
>> Most likely.  Back to the code I go ...
>
> FWIW, I really wonder if populate_rootfs() (run ultimately from
> kernel_init(), by way of kernel_init_freeable(), do_basic_setup() and
> do_initcalls()) ends up with some side effects as far as struct filename
> are concerned...
>
> Note that if we _ever_ hit reuse logics there, we are going to get bogus
> matches asoddingplenty - *all* those sys_mkdir(), etc. are going to be
> with filenames in the same reused buffer.  So if anything in there leaks
> from one call to another, we are going to have a mess on hands.
>
> Another place where that can be a problem is devtmpfs - there's a kernel
> thread doing actual mkdir, mknod, etc. in that abomination and if _that_
> ends up accumulating aushit entries, we'll end up with interesting problems.
>
> Folks, could you print the value of audit_dummy_context() in populate_rootfs()
> and in drivers/base/devtmpfs.c:devtmpfsd()?
>
populate_rootfs: audit_dummy_context() returns 1

Guenter

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