linux-kernel - Re: [BISECT BUG] NFS v4 root not working after 6d972518b821 ("NFS: Add fs

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Date:   Fri, 17 Jan 2020 15:40:55 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-nfs@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Scott Mayhew <smayhew@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [BISECT BUG] NFS v4 root not working after 6d972518b821 ("NFS:
 Add fs_context support.")

On Fri, Jan 17, 2020 at 02:20:03PM +0000, David Howells wrote:
> You seem to be running afoul of the check here:
> 
> 	case Opt_minorversion:
> 		if (result.uint_32 > NFS4_MAX_MINOR_VERSION)
> 			goto out_of_bounds;
> 		ctx->minorversion = result.uint_32;
> 		break;
> 
> which would seem to indicate that the mount process is supplying
> minorversion=X as an option.  Can you modify your kernel to print param->key
> and param->string at the top of nfs_fs_context_parse_param()?  Adding
> something like:
> 
> 	pr_notice("NFSOP '%s=%s'\n", param->key, param->string);
> 
> will likely suffice unless you're directly driving the new mount API - in
> which case param->string might be things other than a string, but that's
> unlikely.  It might also be NULL, but printk should handle that.

The output:

NFS-Mount: 192.168.1.10:/srv/nfs/odroidhc1
Waiting 10 seconds for device /dev/nfs ...
[   14.652366] random: crng init done
Mount cmd:
mount.nfs4 -o vers=4,nolock 192.168.1.10:/srv/nfs/odroidhc1 /new_root
[   22.938314] NFSOP 'source=192.168.1.10:/srv/nfs/odroidhc1'
[   22.942638] NFSOP 'nolock=(null)'
[   22.945772] NFSOP 'vers=4.2'
[   22.948660] NFSOP 'addr=192.168.1.10'
[   22.952350] NFSOP 'clientaddr=192.168.1.12'
[   22.956831] NFS4: Couldn't follow remote path
[   22.971001] NFSOP 'source=192.168.1.10:/srv/nfs/odroidhc1'
[   22.975217] NFSOP 'nolock=(null)'
[   22.978444] NFSOP 'vers=4'
[   22.981265] NFSOP 'minorversion=1'
[   22.984513] NFS: Value for 'minorversion' out of range
mount.nfs4: Numerical result out of range
:: running cleanup hook [udev]
ERROR: Failed to mount the real root device.
Bailing out, you are on your own. Good luck.

sh: can't access tty; job control turned off

Best regards,
Krzysztof