linux-kernel - Re: WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected

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Date:   Tue, 24 Apr 2018 08:55:41 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     syzbot <syzbot+e1670f554caa60fb147b@...kaller.appspotmail.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Henrik Rydberg <rydberg@...math.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected

On Mon, Apr 23, 2018 at 10:49:12AM -0700, Dmitry Torokhov wrote:
> On Sun, Apr 22, 2018 at 7:02 PM, syzbot
> <syzbot+e1670f554caa60fb147b@...kaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot hit the following crash on upstream commit
> > 285848b0f4074f04ab606f1e5dca296482033d54 (Sun Apr 22 04:20:48 2018 +0000)
> > Merge tag 'random_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
> > syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=e1670f554caa60fb147b
> 
> Ted,
> 
> input_add_randomness() (that ends up calling crng_reseed() and the new
> numa_crng_init()) is called (and has been called ever since inception)
> from an interrupt context and thus may not sleep. The following commit
> breaks this:

Fixed by: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1672186.html

Will be pushed to Linux shortly.

						- Ted