linux-kernel - Re: [RT] 2.6.33.3-rt19: WARNING: at fs/namespace.c:648 commit

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Message-ID: <20100504143624.GG4309@uudg.org>
Date:	Tue, 4 May 2010 11:36:24 -0300
From:	"Luis Claudio R. Goncalves" <lclaudio@...g.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	john stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RT] 2.6.33.3-rt19: WARNING: at fs/namespace.c:648
 commit_tree+0xf1/0x10b()

On Wed, May 05, 2010 at 12:27:56AM +1000, Nick Piggin wrote:
| On Tue, May 04, 2010 at 11:04:44AM -0300, Luis Claudio R. Goncalves wrote:
| > John,
| > 
| > As the backtrace seems to be closely related to what has been discussed on
| > the thread "2.6.33.3-rt16: WARNING: at fs/namespace.c:1197", I copied the
| > same people on this message.
| > 
| > As a side note, this time I just see the warning, there is no system freeze
| > involved.
| > 
| > 
| > ------------[ cut here ]------------
| > WARNING: at fs/namespace.c:648 commit_tree+0xf1/0x10b()
| 
| I don't have the -rt tree at hand; can you copy a few lines of code
| around line 648 of fs/namespace.c, please?

Line 648 is the "WARN_ON(mnt->mnt_flags & MNT_MOUNTED);" in this function:


/*
 * the caller must hold vfsmount_lock
 */
static void commit_tree(struct vfsmount *mnt)
{
        struct vfsmount *parent = mnt->mnt_parent;
        struct vfsmount *m;
        LIST_HEAD(head);
        struct mnt_namespace *n = parent->mnt_ns;

        BUG_ON(parent == mnt);

        list_add_tail(&head, &mnt->mnt_list);
        list_for_each_entry(m, &head, mnt_list)
                m->mnt_ns = n;
        list_splice(&head, n->list.prev);

        list_add_tail(&mnt->mnt_hash, mount_hashtable +
                                hash(parent, mnt->mnt_mountpoint));
        list_add_tail(&mnt->mnt_child, &parent->mnt_mounts);
        WARN_ON(mnt->mnt_flags & MNT_MOUNTED);
        mnt->mnt_flags |= MNT_MOUNTED;
        touch_mnt_namespace(n);
}


Luis
-- 
[ Luis Claudio R. Goncalves                    Bass - Gospel - RT ]
[ Fingerprint: 4FDD B8C4 3C59 34BD 8BE9  2696 7203 D980 A448 C8F8 ]

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