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 CE2943AB287 for ; Mon, 31 Aug 2026 02:56:32 +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=1788144992; cv=none; b=KjNxeorJSUfV0dmwSaznshZbCPcgEP9JQ3NE77Pai+nghRX5YnU6U81/5AYZgC/jxxSVG1DwNVJOpv4P4KxqZid8PfkJKdolJyOxqAiVkxVG7si8CGJCxpwOi8HwjO0/TPTSph0XlXr2Kv1fd3LAHaaoQfVzEKjMHzLq/6JrLl8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788144992; c=relaxed/simple; bh=J8cRcyRosPoYBpYJg4rA+q0U/sBrmTAsRvFKa1ugPcE=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=Lnbjip4SUuV/qC1UzPH3azJMyWUtgxeznT2b0Ipz/rSQc57+6xuxWfW+6AxiM1LW73ogEmC4L+ZHmv61kQgnP5hFQKADr8RE2uXKF0Kr2dKZMtCR8HVIXd78Uq4RHDt8SHfshD6NRJjBUMzKsuCCo6eTRRzb2CtihAaMSnf8Yp0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mI/oGI9K; 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="mI/oGI9K" Received: by smtp.kernel.org (Postfix) with ESMTPS id 5C051C2BCFA for ; Mon, 31 Aug 2026 02:56:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1788144992; bh=J8cRcyRosPoYBpYJg4rA+q0U/sBrmTAsRvFKa1ugPcE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=mI/oGI9KidrOoY7xzaEEzYOnOVMiTluUyi1yBw93iMLbT1wNUhTgSBVlVXO69VK4a 6SOcR02wyKfoQ47b9woT0zSCpJp/ddgMojYtsECICLxQ22VdO0JSLzsARAS3GoNyaW O/Rpigi3db+iGx1JEQMUEBZhEcw+jSIUvQGMVkeeIiFemSZQvj5t4j+YMZE9Bi/A7b cZSsiSUbN0iWD+MvPHhmNZN290r4LwxvobWF+zozovUWeOPpDyMqHDJ2qFRHFC0Qtk tvagtHPXzt7x41qTo7mNEUdJrwID/+Ppg/KHDPraWURpjjHxCUakduMVeoI1FVCnp8 YxfgMOvYnpDsw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 4ABA2C53BC9; Mon, 31 Aug 2026 02:56:32 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 221103] xhci_hcd: System lockup under CPU load during usbfs polling of USB devices on AMD platforms Date: Mon, 31 Aug 2026 02:56:31 +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: michal.pecio@gmail.com 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=3D221103 --- Comment #34 from Micha=C5=82 Pecio (michal.pecio@gmail.com) --- Makes sense, I only suggested the alternative placement to confirm that this line is really the trigger and not merely a timing accident. Crazy idea - does anything change if you replace xhci_read_64() with readq() and drop the 'xhci' argument? Probably not, but that would be a very cheap = fix. If not, it looks like the xHCI FW just isn't ready for action and it somehow manages to bring down the whole CPU. --=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.=