linux-kernel - Re: tty: sleeping function in invalid in context do_con_write and deadlock in gsm_control

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Message-ID: <20160905133436.7ba839ac@lxorguk.ukuu.org.uk>
Date:   Mon, 5 Sep 2016 13:34:36 +0100
From:   One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: tty: sleeping function in invalid in context do_con_write and
 deadlock in gsm_control_retransmit

On Sat, 3 Sep 2016 13:07:27 +0200
Dmitry Vyukov <dvyukov@...gle.com> wrote:

> Hello,
> 
> While running syzkaller fuzzer on
> 0f98f121e1670eaa2a2fbb675e07d6ba7f0e146f of linux-next, I've for the
> following splash. Note there are 2 separate bugs (but maybe related):
> 

There are a couple of known cases where strange ldiscs plus console
breaks because the console locking is still completely fubar. The gsm one
is known.

Alan