From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C178AEEAA for ; Sun, 29 Jun 2025 14:19:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751206794; cv=none; b=gTCYCm8BzmUOReZD4vqlCsPkDGi0YzT3pXPmmn67ko7eQ/hZZweRKVGNmMuigQOosVuo7JFYFIhmxTsHM6sfdsanZ9QIcY7i/MhhRQWBWTHS2K/RjfjTuwmEMFcavIJB9g1e1hDbQsmlc58USL1MHrj0+rcekX+nd23qGIPjeY4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751206794; c=relaxed/simple; bh=GzWZFW7yR2ucKSln5tpQ7PmR1veWd7qpGSUlMJZ88pI=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=bJdRnukxBCuU4nK4ZlfuOsz61Y86OOziG+43t4BsTJ7lAyTURqmFjwZPIZMkKk0TuQol0bnkC4Rgn7tjzlSa6IDPA+OJ/bb6lVpxPaHmt/BGsQhKvDrsMb8R6+vFx5nGLvhtjlTsvbC8Bq3S5/gRwXn4MwGUENS181ChrF+Fbow= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dCgG09Q8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dCgG09Q8" Received: by smtp.kernel.org (Postfix) with ESMTPS id 5B1C0C4CEF0 for ; Sun, 29 Jun 2025 14:19:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751206794; bh=GzWZFW7yR2ucKSln5tpQ7PmR1veWd7qpGSUlMJZ88pI=; h=From:To:Subject:Date:In-Reply-To:References:From; b=dCgG09Q8ZGSMHUvmXrCV2zpwp9jsY0pVFGbrGlWup+stGoEzyJv3bOq4IniOZ4QBB MlzOmyJ5wfWoZiU3p655Bxf6UCe20vfTFlguRu6X094f/YqPGvR7+Y6zmfO6Df/2Wz Pclioz1s9cv7LZFQwg1bJb2iE6x6h6impMcP3FnUVSOE9F/S1xDXLA/0x3+8w38ByD FKCsa+R59carbfyKjk3xguNODII/HN/s4BvJeCusJTmPhMQ0dn9Y3TKKn8OCEXDJiU cO4R4EGD9YmI0+ZYjwqYDWbuF/nQemrS+0B1y5rVSUjHH8fOeT/VsIdxqdDjVx3FY4 2QoeYWPnrf1vQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 4845EC433E1; Sun, 29 Jun 2025 14:19:54 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 220272] Latent race condition in USB code unveiled with optimized memset_64.S Date: Sun, 29 Jun 2025 14:19:54 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: stern@rowland.harvard.edu X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D220272 --- Comment #15 from Alan Stern (stern@rowland.harvard.edu) --- At the moment there's no way to know where the real problem lies. It could= be something wrong with your new memset code; it could be something wrong in t= he USB drivers; it even could be something wrong with the mouse itself. The only way to find out more is to record what happens when the mouse fail= s to work. But doing that requires you either to issue commands before the prob= lem starts (that is, while the system is booting -- which can't be done) or els= e to use special (and expensive!) hardware to monitor the signals on the USB cab= le. If you can come up with a way to cause a failure that involves plugging in = the mouse cable after the system is running, then we would have some hope. But otherwise I'm afraid there's not much to try, other than guessing at possib= le solutions. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=