Re: linux-next: Tree for Jan 20 -- Kernel panic - Unable to mount root fs

Paul Moore
2015-01-20T17:39:08Z

On Tuesday, January 20, 2015 05:56:55 PM Sabrina Dubroca wrote:
> Hello,
>
> Today's linux-next doesn't boot on my qemu VM:

...

> I bisected it down to:
>
> 5dc5218840e1 fs: create proper filename objects using getname_kernel()
>
> I reverted then reapplied each part of that patch. It works if I
> leave out the hunk for do_path_lookup:
>
> diff --git a/fs/namei.c b/fs/namei.c
> index eeb3b83661f8..c3d21b79090e 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2001,9 +2001,15 @@ static int filename_lookup(int dfd, struct filename
> *name, static int do_path_lookup(int dfd, const char *name,
> unsigned int flags, struct nameidata *nd)
> {
> - struct filename filename = { .name = name };
> + int retval;
> + struct filename *filename;
>
> - return filename_lookup(dfd, &filename, flags, nd);
> + filename = getname_kernel(name);
> + if (unlikely(IS_ERR(filename)))
> + return PTR_ERR(filename);
> + retval = filename_lookup(dfd, filename, flags, nd);
> + putname(filename);
> + return retval;
> }
>
> I don't know what other info you may need.
> Full dmesg for the failed boot included below.

Thanks for testing this and reporting the problem, especially such a small
bisection. Unfortunately nothing is immediately obvious to me, would you mind
sharing your kernel config so I can try to reproduce and debug the problem?

-Paul

--
paul moore
security @ redhat