netdev - Re: WARNING: refcount bug in should

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Message-Id: <201804211926.EED90245.OOJHFVMLSQOtFF@I-love.SAKURA.ne.jp>
Date:   Sat, 21 Apr 2018 19:26:52 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     ebiederm@...ssion.com, dvyukov@...gle.com
Cc:     syzbot+84371b6062cb639d797e@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, viro@...IV.linux.org.uk,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org
Subject: Re: WARNING: refcount bug in should_fail

Eric W. Biederman wrote:
> Al Viro <viro@...IV.linux.org.uk> writes:
> 
> > On Mon, Apr 02, 2018 at 10:59:34PM +0100, Al Viro wrote:
> >
> >> FWIW, I'm going through the ->kill_sb() instances, fixing that sort
> >> of bugs (most of them preexisting, but I should've checked instead
> >> of assuming that everything's fine).  Will push out later tonight.
> >
> > OK, see vfs.git#for-linus.  Caught: 4 old bugs (allocation failure
> > in fill_super oopses ->kill_sb() in hypfs, jffs2 and orangefs resp.
> > and double-dput in late failure exit in rpc_fill_super())
> > and 5 regressions from register_shrinker() failure recovery.
> 
> One issue with your vfs.git#for-linus branch.
> 
> It is missing Fixes tags and  Cc: stable on those patches.
> As the bug came in v4.15 those tags would really help the stable
> maintainers get the recent regression fixes applied.

OK. The patch was sent to linux.git as commit 8e04944f0ea8b838.

#syz fix: mm,vmscan: Allow preallocating memory for register_shrinker().