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 1449E368290 for ; Tue, 24 Feb 2026 08:52:43 +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=1771923164; cv=none; b=VcsHtNneBu3Zhjieq5LU+MGkP8YYZu7TuKocopR+lX7kS1LFYLGWeoptAr3vBW3NnurqaLCnAqs+40e52bI4LsoVUbkBSm/ArB7WEY+z17TmzeBz5q+cqX1Ms1ZpWYRlA1u+zSq5cB1O0m44UP4eocUAKigxdZGPkaKSgnKSMUc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771923164; c=relaxed/simple; bh=8oxehaWEyVMM201KxKlBnpaI2LbGFkWnoVyn61p0qV8=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=XLxQ+fjN9TpFQK/YbrGW+0FYpUw1dun3TEPEQK6eZkx0M3rGUARUIrzdLzvZrxsrWiDtR5PeYdI/L26a6P8yc1zEw1ASrm9NqMkHUgPHDlPS/277OHCppG/qkDBlSm0WKBIE15q1bbpE+wVok3YKyxqQu+JN1sb/Ucz6/JcnhmA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rG70VY+S; 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="rG70VY+S" Received: by smtp.kernel.org (Postfix) with ESMTPS id B4CDAC19423 for ; Tue, 24 Feb 2026 08:52:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771923163; bh=8oxehaWEyVMM201KxKlBnpaI2LbGFkWnoVyn61p0qV8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=rG70VY+SVV/vVmtwzzPRwBUegsgmajCQ72bHVOrE+btBL7ePFzM7rHxYz7EvqqZY5 3G+2dQ0XAh1Th8ohj6oYRK+HZ4olA5508tI1ZqoBfW6ANXUYVa21xaaJxtrddxvC/Z JJUvGdLNpM4d9jNAxo0f8YNAB7a2dOzSY+J7SKY7BQx6PeikE2ePJKiIV69VfL5DxO jcbKKEoV2DOx51t2otB+TT/k4l96m4bNcdF6CdTLu+AreEAg8r91n0iruV2ExDwiKj MllTxwIOLVwD1Th5j/9zIMnacVepDDi3/w6dxpE6WYnhQ0bQtWzl1WwfNMtrBd0a/y 0/1NoCxbDsQvw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id A6DAFC433E1; Tue, 24 Feb 2026 08:52:43 +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: Tue, 24 Feb 2026 08:52:43 +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 #20 from Micha=C5=82 Pecio (michal.pecio@gmail.com) --- Have you ever seen this "Controller not ready / post-resume error / HC died" sequence without the machine hanging? It would probably be hard not to noti= ce, because the whole bus with all devices becomes unavailable. This is coming from xhci_resume() calling xhci_handshake() and getting -ENO= DEV, which means that the hardware malfunctions (or is misconfigured by PCI laye= r?) and returns 0xffffffff on register read. I patched this code to pretend that it happened and I got the same log messages, but still no crash or freeze. Maybe I need to try it a few more times, but it seems that real users are seeing a hang every time the HC dies while opening /dev/bus/usb/ files, bec= ause otherwise we would get a separate bug about "HC died" and loss of all devic= es when running ADB. Or maybe not, because the bus being suspended means that nobody is actively using its devices, so nobody would notice if they disappear... --=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.=