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 3396B30FF10 for ; Wed, 18 Feb 2026 14:52:29 +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=1771426349; cv=none; b=WUC2ZVyyb2ueGkkH1Oz6A5Jyfxyx0lzIyTfxTZ4Ubo5Lx8hM28GEtTWhhlVxDu/DRgoEfDEr/CO644ka9bRsWEdCMMMqWXswttO5r3C1hxeTtweuG4oAek7B9EZuoqNGgILiGFm79+IUeddUZmo2BL/BlTjNnCMy8a+U9pLn104= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771426349; c=relaxed/simple; bh=c1LV/Bg2X+WTEpggqAbuaiwuLdBz5bn7ENb+BdO/L8Y=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=ORcQV1QMQuxVcCBfjwVskDQmq7x3+xg+VyiRLeBAcpNquE1iHmWU+ZExd+MQwW+Si2wUfieJu4HoLZPp1g5eLgnMmSRCW7K21s1pYaYz4GPDAAnAHlBVJw7HddVfJYZTuK4cad5OE9jqSWmWy3RYDaC2V5ibjVvsd0JK0iBriqU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Rn53/ZVX; 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="Rn53/ZVX" Received: by smtp.kernel.org (Postfix) with ESMTPS id DEE6EC116D0 for ; Wed, 18 Feb 2026 14:52:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771426348; bh=c1LV/Bg2X+WTEpggqAbuaiwuLdBz5bn7ENb+BdO/L8Y=; h=From:To:Subject:Date:From; b=Rn53/ZVX+0AlrIlP2wHIyDf6l7IbSeGBMwAM1V66lJhhcPXd//uDAH4JIDNKzFtop rWDSj2THVX0wpuRAi8YEvXldpgsWMwQn/tXlPMQhwALvMAmMZUhMMm8pUO5/HO1Esh c8MmNH+Tn1DmOuFu0ZeBul3fD7ktArcgima+h5XGBCQM0vo2FdY5ZiZ4OHTXC38EXA 9o5Xf9v4AEilc71MKjsdJbQe6A2Jjw0Dd9PmdcpfG8Rm6GwnGoAjddwtuS3JK731Ub DzFgTuaxhUMJHi0gpxo0rQxDTCbXngTtBqTqHkBTlkQ5eNgO6rV75B6kgnexJdxJHc cjo4QAaZ5t33A== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id CD762C3279F; Wed, 18 Feb 2026 14:52:28 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 221103] New: xhci_hcd: System lockup under CPU load during rapid usbfs polling of SuperSpeed root hubs on AMD Ryzen platforms Date: Wed, 18 Feb 2026 14:52:28 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new 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: paul@unnservice.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: bug_id short_desc product version cf_kernel_version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: 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 Bug ID: 221103 Summary: xhci_hcd: System lockup under CPU load during rapid usbfs polling of SuperSpeed root hubs on AMD Ryzen platforms Product: Drivers Version: 2.5 Kernel Version: 6.12 - 6.19, (and mainline) Hardware: AMD OS: Linux Status: NEW Severity: normal Priority: P3 Component: USB Assignee: drivers_usb@kernel-bugs.kernel.org Reporter: paul@unnservice.com Regression: No Created attachment 309401 --> https://bugzilla.kernel.org/attachment.cgi?id=3D309401&action=3Dedit Test program that polls USB nodes and triggers the system freeze On multiple AMD Ryzen 7000/9000-series systems (X670E/X870 motherboards with recent AGESA firmware) rapidly polling xHCI device nodes via usbfs can caus= e a complete system freeze. Reproduction: 1. Compile/run the attached usb_poll.c 2. Create CPU load (stress-ng --cpu 0 works reliably) 3. On affected machines the system freezes within a few minutes without any= log The trigger on my system is consistently one of the SuperSpeed (USB 3.x 10 Gbps) xHCI root hubs (1d6b:0003). I cannot confirm if other affected users freeze on exactly the same device node, but all reports point to the same c= lass bug polling xHCI. Kernels affected: 6.12 - 6.18 (LTS + mainline) on openSUSE Tumbleweed, Manjaro, Ubuntu, Gento= o, Bazzite, Fedora, etc. I can provide any additional diagnostics needed: - Full lsusb -t -v and lsusb -vvv - lspci -vvv My MB and CPU, others in the ADB bug report have different AMD systems: - Motherboard: Asus ProArt X870-E CREATOR - CPU: AMD Ryzen 9 9950X Originally exposed by ADB=E2=80=99s USB backend (platform-tools =E2=89=A5 3= 6.0.2): https://issuetracker.google.com/issues/472398009 (full discussion with many affected users) Tests: test: Poll all USB devices method: usb_poll.c iterations: 600 result: SYSTEM FREEZE opening Bus 010 Device 001: ID 1d6b:0003 Linux Founda= tion 3.0 root hub test: Skip all root hubs (Device 001 on all busses) method: usb_poll.c iterations: 2400 result: SUCCESS test: Only root hubs method: usb_poll.c iterations: 159 result: SYSTEM FREEZE opening Bus 010 Device 001: ID 1d6b:0003 Linux Founda= tion 3.0 root hub test: All devices except Bus 010 Device 001 method: usb_poll.c iterations: 1900 result: SUCCESS test: Only the specific xHCI root hub method: usb_poll.c iterations: 209 result: SYSTEM FREEZE test: Only the specific xHCI root hub method: while true; do sudo lsusb -v -s 010:001 >/dev/null; sleep 0.1; done iterations: 2400 result: SUCCESS --=20 You may reply to this email to add a comment. 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