linux-kernel - Re: N_HDLC line discipline: Race condition

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Message-ID: <20240515094252.5f63fce9@gato.skoll.ca>
Date: Wed, 15 May 2024 09:42:52 -0400
From: Dianne Skoll <dianne@...ll.ca>
To: Jiri Slaby <jirislaby@...nel.org>
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: N_HDLC line discipline: Race condition

On Wed, 15 May 2024 12:33:24 +0200
Jiri Slaby <jirislaby@...nel.org> wrote:

> I can repro even with 4.19:

Huh!  I managed to make it happen on Debian's 4.19.67
kernel.  I had to redirect stdout/stderr to a file because printing to the
terminal slowed down the writes enough to prevent it from happening for me.

I guess it's hardware-dependent because I can't reproduce it on kernel
6.6 on a Raspberry Pi.

> > So I guess it was introduced sometime between 4.19.67 and 5.10.209.
> >  I'll take a look to see if I can do a git bisect.

> Were you able to do so?

Unfortunately not; the older kernels failed to compile on my machine and
since I'm not a kernel developer and don't actually use any software that
relies on N_HDLC, I gave up... sorry.

Regards,

Dianne.