linux-kernel - Re: possible deadlock in media_devnode

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Message-ID: <20200605042029.GL2667@sol.localdomain>
Date:   Thu, 4 Jun 2020 21:20:29 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     syzbot <syzbot+e3c234427cd464510547@...kaller.appspotmail.com>,
        brendanhiggins@...gle.com, gregkh@...uxfoundation.org,
        heikki.krogerus@...ux.intel.com, laurent.pinchart@...asonboard.com,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        mchehab@...nel.org, rafael.j.wysocki@...el.com,
        sakari.ailus@...ux.intel.com, syzkaller-bugs@...glegroups.com
Subject: Re: possible deadlock in media_devnode_release

On Sat, May 23, 2020 at 10:38:50AM -0700, Randy Dunlap wrote:
> On 5/23/20 10:04 AM, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following crash on:
> > 
> > HEAD commit:    c11d28ab Add linux-next specific files for 20200522
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17330172100000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3f6dbdea4159fb66
> > dashboard link: https://syzkaller.appspot.com/bug?extid=e3c234427cd464510547
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=122eacba100000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12fffa9a100000
> > 
> > The bug was bisected to:
> > 
> > commit 4ef12f7198023c09ad6d25b652bd8748c965c7fa
> > Author: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > Date:   Wed May 13 15:18:40 2020 +0000
> > 
> >     kobject: Make sure the parent does not get released before its children
> 
> Hi,
> 
> Greg just sent a revert for this patch:
> https://lore.kernel.org/lkml/20200523152922.GA224858@kroah.com/
> 
> so all 3 of these reports should be cleared up soon.

Commit was reverted, so invalidating this bug report:

#syz invalid