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 D871D2641C6 for ; Mon, 23 Feb 2026 13:05:21 +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=1771851921; cv=none; b=A1UuJEeHkexAvEti4EV51SvDj/SirBqcVCU9LZx5yetQ51CaWTUF49ghB+fit5Vf29t7lPU5QE9MxipfJOLJxQly2WpylRGjumlNHYWzCmWzsK8tYWrtecgm8OwU70Xy7Z32/V7C/9XcnaVkIgttIoDpM1KkGwAyfIiPsTuJGf0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771851921; c=relaxed/simple; bh=0xGZHWjD+YOoo7SQOmJUGZeDTGmrHYdRE5cBGpkcDiQ=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=BjZ49Q7lot9xI9DhzpetTYp8Ugic+gt4cve4Fvk+uni/7v/MvFt7Pz1jbXqCJNUWmAItf2bOms+PoKFfCTLWefNfIgiZJpO/Wn/7VCwrmM+BVYPRRHz2bBDTbb76YEtZMaMKW8a43PFTJ7mq8qhrMvnc34zsmz/62p3cyAf5ZbY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CrEs5jeU; 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="CrEs5jeU" Received: by smtp.kernel.org (Postfix) with ESMTPS id 873F2C116D0 for ; Mon, 23 Feb 2026 13:05:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771851921; bh=0xGZHWjD+YOoo7SQOmJUGZeDTGmrHYdRE5cBGpkcDiQ=; h=From:To:Subject:Date:In-Reply-To:References:From; b=CrEs5jeUZQp1oi3it+gW05L4LL6cqnIUz6AWGKgqhocMUqJrs5ryEtCph4WKCN+YE vrlbahfAoQgAGAdHcy2xJFhLp/EIp4n4WN1msJ+ez4JaFpWfPbsSJEUPcSXDcHwaUV oMvVwurX2An0CelztEGveB0HauUFvdS7kLxeiTRv77GNL2ueSNXHXcMmVQ7tzBZaEI CJn6k3Jtzt9bp+lYIO6qrnlsapU5fGQfnSwxmPKv4eF7umjJambXNhNsFQG+6pxZE3 tMh0f6V8TeIgNCU740hHlQ7qdneeYi6Mc5aCkbsL9T9tXB6v/6IAuDOIXIjcp/3cdv h5wSDLyrIxdGQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 79319C3279F; Mon, 23 Feb 2026 13:05:21 +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, 23 Feb 2026 13:05:21 +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 #16 from Micha=C5=82 Pecio (michal.pecio@gmail.com) --- Would this fix it as well? echo 'on' > /sys/bus/pci/devices//power/control It seems that this must be set to 'auto' to trigger those suspend-resume cy= cles of the host controller, and it is quite possible that the problem is caused= by suspending the HC, not any USB device. That being said, I toggled it to 'auto' on a few HCs currently plugged into= my test system (was 'on' for all of them) and your test program (with failing ioctl() included) still runs just fine. It's at 3000 iterations now. --=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.=