linux-kernel - Re: INFO: task hung in fsnotify_mark_destroy

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Date:   Tue, 24 Apr 2018 10:30:49 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     Jan Kara <jack@...e.cz>
Cc:     syzbot <syzbot+e38306788a2e7102a3b6@...kaller.appspotmail.com>,
        amir73il@...il.com, Dan Carpenter <dan.carpenter@...cle.com>,
        dwindsor@...il.com, elena.reshetova@...el.com,
        LKML <linux-kernel@...r.kernel.org>, mszeredi@...hat.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: INFO: task hung in fsnotify_mark_destroy_workfn

On Wed, Apr 18, 2018 at 11:36 AM, Jan Kara <jack@...e.cz> wrote:
> OK, so we are waiting for the grace period on fsnotify_mark_srcu. Seems
> like someone is holding fsnotify_mark_srcu too long or srcu period cannot
> finish for some other reason. However the reproducer basically contains
> only one binder ioctl and I have no idea how that's connected with fsnotify
> in any way.

Yeah, binder isn't involved with fsnotify at all.

> So either the reproducer is wrong, or binder is corrupting
> memory and fsnotify is just a victim, or something like that...

>From the dumped stacks I don't see how binder is involved in that task
getting hung up, so either it's not related to binder after all, or it
is indeed some form of corruption, but then I wouldn't expect it to
reproduce in the same way every time (or otherwise expect KASAN to
catch it). I'll try to see if I can repro it locally.

Martijn


>
>                                                                 Honza
> --
> Jan Kara <jack@...e.com>
> SUSE Labs, CR