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Tue, 25 Aug 2026 03:06:35 -0700 (PDT) Date: Tue, 25 Aug 2026 15:36:32 +0530 From: Lovekesh Solanki To: Mathieu Fluhr Cc: Michal Pecio , Thorsten Leemhuis , Mathias Nyman , linux-usb@vger.kernel.org, regressions@lists.linux.dev, stable@vger.kernel.org, linux-kernel@vger.kernel.org, Mario Limonciello , Forest , Slavik Dev Subject: Re: [REGRESSION] 6.12.36+: usb: hub: post-resume delayed work triggers > uncorrected MCE / data fabric sync flood on Threadripper 7970X > (bisected to aec11e5f9c45) Message-ID: References: <07435e6b-ee30-4c85-8c8b-0ce3a4ead1d9@leemhuis.info> <20260823174059.46fec036.michal.pecio@gmail.com> 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 Mon, Aug 24, 2026 at 09:37:55PM +0200, Mathieu Fluhr wrote: > Yes. As mentioned, I first thought that the emulator itself triggered that by > doing something that the CPU did not like.To be honest, I barely play with old > Android versions anymore, but seeing that I could reproduce it even with > Android 13 or 14 made me suspicious. > > I _guess_ Google implemented a workaround inside adb for version Android > 15 since using this version, it remains stable for more than 2 hours. > > But, in the end, the situation is that from a simple user account having access > to some usb plugged in devices (I usually add my user account to the plugdev > group and use some known udev rules to access my Android tests devices), > you have a way to crash the complete system. > > > Opinions seem to vary on whether CPU load must be present or absent. > > On my side (and I am here only speaking about my TR. I don't know about > other Ryzen CPUs), I can't reproduce it under load, and one condition to > reproduce it is my CPU going in C2 state. > -> I did a 2:30 hour test using several youtube videos playing at the same > time on my desktop, also stressing the emulator with some 3D Mark runs > (as mentioned, I first suspected the nvidia driver to be faulty). As long as my > computer was busy everything went fine. But then I let it stand still for a few > minutes, and it just crashed. > > If you need me to do some further tests or experiments, let me know. I will > be more than happy to play the guinea pig here. Was this result after applying the small patch I sent above? Regards, Lovekesh