linux-kernel - Re: "fs/namei.c: keep track of nd->root refcount status" causes boot panic

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Message-ID: <20190903135354.GI1131@ZenIV.linux.org.uk>
Date:   Tue, 3 Sep 2019 14:53:54 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Qian Cai <cai@....pw>, linux-fsdevel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: "fs/namei.c: keep track of nd->root refcount status" causes boot
 panic

On Tue, Sep 03, 2019 at 06:50:24AM -0700, Christoph Hellwig wrote:
> On Tue, Sep 03, 2019 at 02:48:32PM +0100, Al Viro wrote:
> > Not sure what would be the best way to do it...  I don't mind breaking
> > the out-of-tree modules, whatever their license is; what I would rather
> > avoid is _quiet_ breaking of such.
> 
> Any out of tree module running against an upstream kernel will need
> a recompile for a new version anyway.  So I would not worry about it
> at all.

There's much nastier situation than "new upstream kernel released,
need to rebuild" - it's bisect in mainline trying to locate something...