From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4ECF837D104 for ; Sat, 29 Aug 2026 18:14:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788027248; cv=none; b=cQrJuM6kg3BvX8g6315mucdu1QVdHt9bhxZUTFxspSnU+6LAGaSkL/+67yjSo5x1gN8LWjcTK1XmTezWg3mvwBPRhG95t+4X2x4JEebtWbU57wfFziC3wr+EfflrizOzonCMkaMonJ3qlAdGfIV4WNdQp6vtxJkyE3mYxaRNEtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788027248; c=relaxed/simple; bh=loFjECy4sphZfcRBvGK5Oh4/7DGdoxqLo0BnnFQ2fLQ=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type; b=qPfUu1DNrXZPrbtWUNdMMvFivIt0x31C6EbQeJ/CSFgpTsiaM8Juo84YWb8pG3Rak/U4YrTjPluEClKPZwC8/NRWp2sjlM2wKZ3z99t6z4eJDbfFAiNVJuVkA/UyhLX7E264kKn4Q7YLh+y1QmJg+NvQLYpdV/EgSg22vnbFIes= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=r8PF9RPc; arc=none smtp.client-ip=209.85.128.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="r8PF9RPc" Received: by mail-wm1-f41.google.com with SMTP id 5b1f17b1804b1-49557167508so20943235e9.1 for ; Sat, 29 Aug 2026 11:14:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1788027245; x=1788632045; darn=vger.kernel.org; h=content-transfer-encoding:content-type:mime-version:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=Tv8q5pED/14xlo0onHc2IPHxvUthiwGg/n7Y4Pm42xA=; b=r8PF9RPcYXzd1+Rt5kzhGR/FD72p8IWXnv6yDY2FmVgp0rhI6ifszcwsQKYlnQqN03 sgekx8NZD0s7p+5wficy2Py/GQR/Ih4ngUcq/l3OK9wI//ebKOl9Z3jRn/60KBuMXaPE +mwye2W89EjOlS9CAUz5lWsuBiU4HiDhg0giJamYML0QiyLsivc7yx38DHjTHQuqMaO7 1ZY6GgYNtTaU4dg51mrZPO8fODfTMn9Oo+G9md7dSNCdq58y3eP3yxZPIkKXsd1Gw3Mv FSZWQJ3SP4zgPwv6nb9+mclViwN5snRrQIlu4sNVmz4LbyLznFiU5eBonFvLGI1XXVy4 HCcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788027245; x=1788632045; h=content-transfer-encoding:content-type:mime-version:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to:content-type; bh=Tv8q5pED/14xlo0onHc2IPHxvUthiwGg/n7Y4Pm42xA=; b=etQeaObfKu3pUFnUbSI1bO1hxuov7DMTFU2qjO2necPtPkHF17XiTa1E53ZsHaT7cW uihCwtVpU/c+2atIs9xhiZU1k7gpMJkCWeuJ3tH5IT5qpH3w6JMMIz+6mO6+7AusdkN9 bCwjRIdmF5eQS7eUW1RclX3FWFXEMofhLdNgPJV6+8FU9yMIxKkki/JnpKtlvqQ0MQOt sqhWH0fWsoPOrwzh7Yfonj1eGYoiJgjTnvNaIBp1CEf7VQfCFK+OTX0LM3tf1c0OOxdC ZCLmeHR6WbCaGTVRofBshpc831XhcnH98fDuTxR6S4GrOXoN19TYxelIGVzotlKGjhK+ zRAQ== X-Gm-Message-State: AFuF++n6UXJXXgxodf2bd5BGvMWdBrl2+0bCj068cALz11ws3vWHmpI0 NtALQ604fAv12MdJsc+TGeF3jooRqRUm2rSBQALhEvs2FiDi4VUiveW/ X-Gm-Gg: AR+sD13D1+iEWkKWqi1Rxc2sJx/9CS7fHCONe1kbbDznjyb6u8wxSa+xNObI+xPwmQT BOrMeFVm/vshSize2U4XdE6bbHJhkjtfclWcCKN11hWQPqs4wXbTemPMkn2jDTwgyL0uLlvBzmR 6Q6x7Tf8k8BbNvndR67dkGivhLC5tlbd+8fl7POTkuqIyqwgY87rIOhYHH4jtOiC4j+JH6BQvF/ r6i6QtP/CumLYGqoo14+R20AJXlIMNZi5PH2ASYVM28G4yAZw3EOmXA0rvrXlhztND+o675Xp3c BnA8IaKNuD98jtLZU5SglG0v1yyI3na/+mRm0vo+HzBdpg466u7Ax/+FFunhldXq+u3iU48v25U a3JPUlErS3XAj9Eb1qMehjReKdaX6GJJq6gh+EbpLvXDd2yf/9whr69k1A5x4EF/5Ts7KyAKDX7 D1/TfROTcZZWrEfAEhbVgNGirklgcftaYmUhongS/EguhR22+pbM4FJkbFDaJB01QBlsg= X-Received: by 2002:a05:600c:19ca:b0:495:52a5:8829 with SMTP id 5b1f17b1804b1-49b91c47b3dmr210405515e9.11.1788027245295; Sat, 29 Aug 2026 11:14:05 -0700 (PDT) Received: from foxbook (bfk5.neoplus.adsl.tpnet.pl. [83.28.48.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49b95013ce4sm128793645e9.14.2026.08.29.11.14.04 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Sat, 29 Aug 2026 11:14:04 -0700 (PDT) Date: Sat, 29 Aug 2026 20:14:01 +0200 From: Michal Pecio To: Anna-Maria Behnsen , Frederic Weisbecker , Ingo Molnar , Thomas Gleixner Cc: linux-kernel@vger.kernel.org Subject: [BUG] NOHZ tick-stop error: local softirq work is pending Message-ID: <20260829201401.2b107cd1.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi, I'm getting these warnings on current mainline. Quite reliable trigger is I/O load (like md5sum /dev/sda) on an otherwise idle system: [ 86.082138] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 117.959975] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 121.054544] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 121.988208] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 143.932445] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 156.083120] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 156.685222] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 156.789911] NOHZ tick-stop error: local softirq work is pending, handler #40!!! [ 158.986070] NOHZ tick-stop error: local softirq work is pending, handler #40!!! I see it consistently across several reboots. I also did two v7.2 boots with the same workload and these ran cleanly 10 minutes each, so it looks like a merge window regression. The system is ordinary x86-64 with CONFIG_PREEMPT. grep HZ .config: CONFIG_NO_HZ_COMMON=y # CONFIG_HZ_PERIODIC is not set CONFIG_NO_HZ_IDLE=y # CONFIG_NO_HZ_FULL is not set # CONFIG_NO_HZ is not set # CONFIG_HZ_100 is not set # CONFIG_HZ_250 is not set # CONFIG_HZ_300 is not set CONFIG_HZ_1000=y CONFIG_HZ=1000 It seems bisectable, but maybe somebody has better ideas? Regards, Michal