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 00C23357739 for ; Thu, 8 Oct 2026 17:27:28 +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=1791480449; cv=none; b=RDwXq8ADpORx8N2iQJRV3znttAj+QlqQMHZtUbbp9hhFqjyK6zM4Myt0eB3sKjrwQHI+783ZLM44gCBfidczjzebpyfy+LDdwqGHK+zT506pUHug8mo7khhl6LbIDdtKow/SJtF56GDmfRAE+QSy56QNrgNdNncUypYQ/MtwtBw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791480449; c=relaxed/simple; bh=rV5nNBtN5bk+iNlra4C8UC5FExmaFteZ7Ti0B1EZtdE=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=EadqfJY80gwDw9KHzU9AZvi4ViQexRJq6OgvXMYgJHUroUddLqmDpX+TSk/stuNnBCY2ltno2SOdJ0G/5PhlTgktDmLNuYRq4KXA8giLTQWBCKDirxgInQyZSP5DMSu+9Kdv5QlXy1lUDqjCI4a5aiMoickD/m84FYt5cZ1b9ac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mkN4B9WZ; 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="mkN4B9WZ" Received: by smtp.kernel.org (Postfix) with ESMTPS id 77595C2BD00 for ; Thu, 8 Oct 2026 17:27:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1791480448; bh=rV5nNBtN5bk+iNlra4C8UC5FExmaFteZ7Ti0B1EZtdE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=mkN4B9WZpaBQVZoafeKjlFJtS98Du4HB6kFM+2QQYuoLgcMnMtX3EDiCcB2UhrE7u 0DHZwbjV3Rh3EtnJ83t4HwB/VrEYJOtUeURU7WBP9P49L/liRrKnFINbEd3w5kowuo 0fCkQS4qaPtLTlk0K3vN58mfmB9EAZzhLez0oieU4QcEcCiquoQ+Y1izYBT0qs/fWG yNxlUWdJZvEc61o/yOePN6EnCc0kk4LOx7dfrQYQrnuNfHmjJFPydXQrtVYaAuqxFd vWvCpGoI4oR0KIn2NL02Qhpiqahj+Z5GhtHH1aFt3POcQmAoAIijCar0dsXSSuZuzc PUj00vInxM+iw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 666A5C53BC5; Thu, 8 Oct 2026 17:27:28 +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: Thu, 08 Oct 2026 17:27:27 +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: langosz@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: cc 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 langosz@gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |langosz@gmail.com --- Comment #42 from langosz@gmail.com --- New affected system: ASUS ProArt B850-CREATOR WIFI NEO + Ryzen 7 9700X =E2= =80=94 total freeze from adb legacy USB backend polling, no Android device connected I can confirm this bug on my system. Symptoms are identical to the ones described here: complete freeze (keyboard dead including SysRq, mouse dead,= no SSH response, display frozen), only a hard reset recovers, and zero kernel = logs =E2=80=94 no panic, no soft lockup message, nothing. I had kernel.softlocku= p_panic=3D1, kernel.watchdog_thresh=3D5, and hung_task_panic=3D1 enabled with kdump inst= alled and verified working; the NMI watchdog stayed completely silent and no vmco= re was ever produced, so this is a hard halt below what the kernel can report. System: Motherboard: ASUS ProArt B850-CREATOR WIFI NEO (BIOS 1103, 2026-09-18; also reproduced on BIOS 0239) CPU: AMD Ryzen 7 9700X (Raphael/Mendocino iGPU driving the display) GPU: 2=C3=97 Radeon RX 9060 XT (Navi 44, headless compute via ROCm/llama.cp= p) RAM: 32 GB DDR5-6000 (EXPO enabled) OS: Ubuntu 26.04.1 LTS, kernel 7.0.0-38-generic (also reproduced on 7.0.0-34 and 7.0.0-14) Trigger: a resident adb server from android-tools-adb (platform-tools 34.0.5-debian, legacy NATIVE USB backend that polls /dev/bus/usb every seco= nd). Important: no Android device was connected during any of the freezes =E2=80= =94 the adb server was simply running in the background after I had used adb devices/adb logcat, so polling of the root hubs alone was sufficient. The load condition was sustained CPU/PCIe/memory load from local LLM inference (llama.cpp, HIP/ROCm backend, both 9060 XTs active). Freezes happened randomly over sev= eral days, always while that workload was running. USB topology (matches the xHCI superspeed root hub pattern from comment #59= ): three 1d6b:0003 Linux Foundation 3.0 root hubs (Bus 2/4/6) plus 2.0 hubs; attached devices are an IMC Bluetooth radio, an ASUS AURA LED controller (0b05:19af), a keyboard and a mouse =E2=80=94 nothing unusual. Ruled out on my side: BIOS update 0239 =E2=86=92 1103 (AGESA 1.3.0.1d) did = not help; kernel downgrade to 7.0.0-14 and upgrade to 7.0.0-38 did not help; disabling EXPO (running at JEDEC speed) did not help =E2=80=94 freezes continued, and= I have since re-enabled EXPO with the adb workaround in place and the system remai= ns stable, so memory speed is not a factor; temperatures normal (37=E2=80=9343= =C2=B0C); no MCE/EDAC errors, no PCIe AER errors ever logged. Workaround: setting ADB_LIBUSB=3D1 system-wide (forces the libusb backend) = =E2=80=94 no freezes for days since, with the same inference workload running, adb available, and EXPO re-enabled. --=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.=