linux-kernel - Re: [PATCH] usb: gadget: dummy_hcd: execute hrtimer callback in softirq context

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Message-ID: <CA+fCnZcWvtnTrST3PrORdPwmo0m2rrE+S-hWD74ZU_4RD6mSPA@mail.gmail.com>
Date: Mon, 29 Jul 2024 18:14:30 +0200
From: Andrey Konovalov <andreyknvl@...il.com>
To: Marcello Sylvester Bauer <sylv@...v.io>
Cc: andrey.konovalov@...ux.dev, Alan Stern <stern@...land.harvard.edu>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Aleksandr Nogikh <nogikh@...gle.com>, Marco Elver <elver@...gle.com>, 
	Alexander Potapenko <glider@...gle.com>, kasan-dev@...glegroups.com, 
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	syzbot+2388cdaeb6b10f0c13ac@...kaller.appspotmail.com, 
	syzbot+17ca2339e34a1d863aad@...kaller.appspotmail.com, stable@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: dummy_hcd: execute hrtimer callback in
 softirq context

On Mon, Jul 29, 2024 at 10:26 AM Marcello Sylvester Bauer <sylv@...v.io> wrote:
>
> Hi Andrey,

Hi Marcello,

> Thanks for investigating and finding the cause of this problem. I have
> already submitted an identical patch to change the hrtimer to softirq:
> https://lkml.org/lkml/2024/6/26/969

Ah, I missed that, that's great!

> However, your commit messages contain more useful information about the
> problem at hand. So I'm happy to drop my patch in favor of yours.

That's very considerate, thank you. I'll leave this up to Greg - I
don't mind using either patch.

> Btw, the same problem has also been reported by the intel kernel test
> robot. So we should add additional tags to mark this patch as the fix.
>
>
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Closes:
> https://lore.kernel.org/oe-lkp/202406141323.413a90d2-lkp@intel.com
> Acked-by: Marcello Sylvester Bauer <sylv@...v.io>

Let's also add the syzbot reports mentioned in your patch:

Reported-by: syzbot+c793a7eca38803212c61@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=c793a7eca38803212c61
Reported-by: syzbot+1e6e0b916b211bee1bd6@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=1e6e0b916b211bee1bd6

And I also found one more:

Reported-by: syzbot+edd9fe0d3a65b14588d5@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=edd9fe0d3a65b14588d5

Thank you!