linux-kernel - Re: INFO: task hung in corrupted (2)

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Message-ID: <nycvar.YFH.7.76.2006110856290.13242@cbobk.fhfr.pm>
Date:   Thu, 11 Jun 2020 08:58:06 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Peter Hutterer <peter.hutterer@...-t.net>
cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        syzbot <syzbot+6921abfb75d6fc79c0eb@...kaller.appspotmail.com>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        amir73il@...il.com, Felipe Balbi <balbi@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jan Kara <jack@...e.cz>, kuba@...nel.org,
        linux-fsdevel@...r.kernel.org, mathew.j.martineau@...ux.intel.com,
        matthieu.baerts@...sares.net, mptcp@...ts.01.org,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: INFO: task hung in corrupted (2)

On Thu, 11 Jun 2020, Peter Hutterer wrote:

> based on the line numbers it's the while loop in there which is also the one
> that could be unbounded if the hid collection isn't set up correctly or if
> we have some other corruption happening.

Given the fact this is syzkaller-induced, it's almost certainly a 
completely bogus collection. So we are surely missing sanity check that 
there exists a collection with idx -1.

> Need to page this back in to figure out what could be happening here.

Thanks,

-- 
Jiri Kosina
SUSE Labs