On Mon, Jul 29, 2024 at 06:14:30PM +0200, Andrey Konovalov wrote:

On Mon, Jul 29, 2024 at 10:26 AM Marcello Sylvester Bauer [off-list ref] wrote:

quoted

Hi Andrey,

Hi Marcello,

quoted

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!

quoted

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.

quoted

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 <redacted>
Closes:
https://lore.kernel.org/oe-lkp/202406141323.413a90d2-lkp@intel.com (local)
Acked-by: Marcello Sylvester Bauer <redacted>

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

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

And I also found one more:

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

You need to be careful about claiming that this patch will fix those bug 
reports.  At least one of them (the last one above) still fails with the 
patch applied.  See:

https://lore.kernel.org/linux-usb/ade15714-6aa3-4988-8b45-719fc9d74727@rowland.harvard.edu/ (local)

and the following response.

Alan Stern