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Mon, 29 Jul 2024 09:14:41 -0700 (PDT) MIME-Version: 1.0 References: <20240729022316.92219-1-andrey.konovalov@linux.dev> In-Reply-To: From: Andrey Konovalov Date: Mon, 29 Jul 2024 18:14:30 +0200 Message-ID: Subject: Re: [PATCH] usb: gadget: dummy_hcd: execute hrtimer callback in softirq context To: Marcello Sylvester Bauer Cc: andrey.konovalov@linux.dev, Alan Stern , Greg Kroah-Hartman , Dmitry Vyukov , Aleksandr Nogikh , Marco Elver , Alexander Potapenko , kasan-dev@googlegroups.com, Andrew Morton , linux-mm@kvack.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+2388cdaeb6b10f0c13ac@syzkaller.appspotmail.com, syzbot+17ca2339e34a1d863aad@syzkaller.appspotmail.com, stable@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 1378D100025 X-Stat-Signature: 6ytnnhs7ogui1tng9pn8383jg7nai894 X-HE-Tag: 1722269682-757374 X-HE-Meta: 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 pFg0q2Co 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jul 29, 2024 at 10:26=E2=80=AFAM Marcello Sylvester Bauer 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 > Closes: > https://lore.kernel.org/oe-lkp/202406141323.413a90d2-lkp@intel.com > Acked-by: Marcello Sylvester Bauer 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=3Dc793a7eca38803212c61 Reported-by: syzbot+1e6e0b916b211bee1bd6@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D1e6e0b916b211bee1bd6 And I also found one more: Reported-by: syzbot+edd9fe0d3a65b14588d5@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3Dedd9fe0d3a65b14588d5 Thank you!