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Date: Tue, 14 Nov 2023 21:53:41 +0000
From: Al Viro <viro@zeniv.linux.org.uk>
To: Stephen Smalley <stephen.smalley.work@gmail.com>
Cc: Paul Moore <paul@paul-moore.com>,
	Christian Brauner <brauner@kernel.org>, selinux@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH][RFC] selinuxfs: saner handling of policy reloads
Message-ID: <20231114215341.GU1957730@ZenIV>
References: <20231016220835.GH800259@ZenIV>
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Sender: Al Viro <viro@ftp.linux.org.uk>

On Tue, Nov 14, 2023 at 03:57:35PM -0500, Stephen Smalley wrote:
> On Mon, Nov 13, 2023 at 11:19 AM Paul Moore <paul@paul-moore.com> wrote:
> >
> > On Mon, Oct 16, 2023 at 6:08 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
> > >
> > > [
> > > That thing sits in viro/vfs.git#work.selinuxfs; I have
> > > lock_rename()-related followups in another branch, so a pull would be more
> > > convenient for me than cherry-pick.  NOTE: testing and comments would
> > > be very welcome - as it is, the patch is pretty much untested beyond
> > > "it builds".
> > > ]
> >
> > Hi Al,
> >
> > I will admit to glossing over the comment above when I merged this
> > into the selinux/dev branch last night.  As it's been a few weeks, I'm
> > not sure if the comment above still applies, but if it does let me
> > know and I can yank/revert the patch in favor of a larger pull.  Let
> > me know what you'd like to do.
> 
> Seeing this during testsuite runs:

Interesting...  i_nlink decrement hitting an inode already with zero
nlink...

<pokes around>

Could you add
        inc_nlink(sb->s_root->d_inode);
in sel_make_swapover_dir() right before
        inode_unlock(sb->s_root->d_inode);

and check if that fixes the problem?