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Wed, 26 Aug 2026 05:35:37 -0700 (PDT) Date: Wed, 26 Aug 2026 18:05:34 +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: stable@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 Tue, Aug 25, 2026 at 11:43:22PM +0200, Mathieu Fluhr wrote: > The patch you sent makes the issue go away. I am now running the exact same > scenario for 2 hours, without any crash. That's good, thanks for confirming. > However, I am not sure if this can qualify for a proper fix, since I > do not have any > external hub connected to my motherboard: All my USB devices are directly > plugged into root hubs (and at the moment, there is only a keyboard and a > mouse). Yeah that's the point it only skips the 200ms hold for root hubs. The external hubs still get their fair hold since a parent exists for them. So external hubs are completely unaffected by this patch. On 'proper fix', I think it is, even if we keep this bug seperate for a moment, it makes sense to not give root hubs hold they don't need. I'd love to hear more thoughts on the patch. Regards, Lovekesh