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[83.28.84.81]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e3ece5e4asm32900670f8f.59.2026.10.29.03.44.25 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 29 Oct 2026 03:44:26 -0700 (PDT) Date: Thu, 29 Oct 2026 11:44:22 +0100 From: Michal Pecio To: Greg Kroah-Hartman Cc: IgorpetinDev , Alan Stern , Tejun Heo , Oliver Neukum , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, syzbot+a5b220cacb0618384d5a@syzkaller.appspotmail.com Subject: Re: [PATCH v3] usb: core: hcd: flush giveback work on stop Message-ID: <20261029114422.2ba64d53.michal.pecio@gmail.com> In-Reply-To: <2026102924-flashily-myspace-60a8@gregkh> References: <20261023174015.54793-1-igorpetindev@gmail.com> <20261024155614.2732-1-igorpetindev@gmail.com> <20261025000643.425c57ca.michal.pecio@gmail.com> <2026102924-flashily-myspace-60a8@gregkh> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 29 Oct 2026 10:42:35 +0100, Greg Kroah-Hartman wrote: > On Sun, Oct 25, 2026 at 10:54:57AM +0300, IgorpetinDev wrote: > > Hi Michal, > > > > > No such domain? > > > Looks like you trusted an LLM ;) > > > > good catch, that was just a clumsy typo on my part: I accidentally typed > > appspotmail.com instead of appspot.com in the closes tag, anyway - the syzbot ID > > itself is valid. If Greg or Alan prefer a v4 to fix the URL typo, I'll > > gladly resend it, or it can be fixed up when applying. > > Please fix up and send a new version. > > thanks, > > greg k-h Hi Greg, This race had been reported by syzbot previously and a patch has been hanging on linux-usb since August. https://lore.kernel.org/linux-usb/20260823125831.6ea35650.michal.pecio@gmail.com/ There is only a bit of controversy over flushing vs cancelling the work. I think that cancelling (and leaking stray completions as opposed to letting them run, likely UAF things and maybe corrupt memory) is the right choice, as a courtesy to anyone who might create such bugs and need to deal with them. Regards, Michal