linux-kernel - Re: WARNING in port

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Date:   Tue, 24 Jul 2018 16:14:14 +0900
From:   DaeRyong Jeong <threeearcat@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Colin King <colin.king@...onical.com>, perex@...ex.cz,
        alsa-devel@...a-project.org, Kyungtae Kim <kt0755@...il.com>,
        Byoungyoung Lee <lifeasageek@...il.com>,
        syzkaller@...glegroups.com, bammanag@...due.edu,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: WARNING in port_delete

I agree with that having a C reproducer would be much better.
Now I'm working on it.
I will immediately let you know once I get the C reproducer.


Thank you.

Best regards,
DaeRyong Jeong
On 24 Jul 2018, 4:00 PM +0900, Takashi Iwai <tiwai@...e.de>, wrote:
> On Tue, 24 Jul 2018 05:59:56 +0200,
> DaeRyong Jeong wrote:
> >
> > I just realized that the crash has been spotted by Syzkaller a few days before.
> > (https://syzkaller.appspot.com/bug?id=3490860a465e6b39227c6906f0ef2d40ad4d5bb1)
> >
> > I'm CC'ing Syzkaller's mailing list.
>
> It's very likely a false-positive sanity check, and if so, nothing
> serious at all. We may simply remove two snd_BUG_ON() lines.
>
> But I'd love to have a C reproducer to confirm my understanding is
> correct...
>
>
> thanks,
>
> Takashi
>
> ---
> --- a/sound/core/seq/seq_ports.c
> +++ b/sound/core/seq/seq_ports.c
> @@ -272,9 +272,6 @@ static int port_delete(struct snd_seq_client *client,
> if (port->private_free)
> port->private_free(port->private_data);
>
> - snd_BUG_ON(port->c_src.count != 0);
> - snd_BUG_ON(port->c_dest.count != 0);
> -
> kfree(port);
> return 0;
> }

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