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Fri, 20 Feb 2026 05:17:47 -0500 (EST) Date: Fri, 20 Feb 2026 11:17:45 +0100 From: Greg KH To: bugzilla-daemon@kernel.org Cc: linux-usb@vger.kernel.org Subject: Re: [Bug 221103] xhci_hcd: System lockup under CPU load during usbfs polling of USB devices on AMD platforms Message-ID: <2026022044-discolor-blazing-4e4b@gregkh> References: Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Fri, Feb 20, 2026 at 10:07:57AM +0000, bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=221103 > > --- Comment #9 from Paul Alesius (paul@unnservice.com) --- > > Or perhaps simply this would crash it? > > while sleep .1 ; do true > Yes it froze the system on iteration 3000 > > A C program without ioctl also froze it on iteration 887. Doing ioctl seems to > trigger it much faster at iteration ~200. > > I ordered a USB-to-ethernet adapter in the meantime to try to get more > diagnostics through netconsole, instead of serial cable, will that work? If the USB stack is locking up, dumping USB data out when that happens would obviously not be possible :) There is a special USB debug cable that will work instead, search around on the web for one if you are curious about using it. good luck! greg k-h