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 BC1CB3D090A for ; Mon, 20 Apr 2026 22:19:22 +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=1776723562; cv=none; b=A/vU+Tx0NEDuH3pxRSInR4ClrNiHXYygUbV+LdFSXECQ2HEePRZXP9oqEoY9B37Y9U6fTD3Feabt4czRu4lQoVKpaQs/yz7gu84nJmJX1iGeSqLwuIUuZH5zgn8RLfP3WTG/WhzJC1iivXtlcZbTJfkFRQF3Uf7jsKMla1H4vqI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776723562; c=relaxed/simple; bh=6F5uJhoHkgfD+UZiB2RroLXt1N+F5jRaeg5acAZ2M28=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=NPXPNEU8F1kHkdKDHt+CXYQhA/zLsyN1hTGPza5sm9n5W618CyXtIXqMd7UTqHZYQT66Qd5ylmpL6yyeFkEW3WCpv/+YBv1I3Df5xx5OT8g+JxvB7H1Kfqu77SR0pNuI8xrJml0BFbZzRF5pRrVP5hsSxd6Iu9IEHEbH4YC73kg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CmUu6sFW; 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="CmUu6sFW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 856BEC19425; Mon, 20 Apr 2026 22:19:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776723562; bh=6F5uJhoHkgfD+UZiB2RroLXt1N+F5jRaeg5acAZ2M28=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=CmUu6sFWlskWDNBP0GEEOsJX1ef4T0Ihv7TV6rDfH44mBE4GYkhe1XI+VrsqFZfXj c4qP/UWXwrv7fKKWnMGzQ2b2V92U2xoqjtz5Qu9ZcuwmagzNgtMyJ/ouLpD8tfvwa1 +XoFUHE6nTccmtoiQfyX7X+K/1JFikFrafp/bDXknB/j7L0RVtO7jM0bga2JeZp3Im C4UeKqhZNYWBcCwQf5/T9r38Uv0l6EqUCRbvveqd9hFfhi8kxAq/sBhH6pwfMKxhzK kGlSd5IHVxuK/0lUmIivnn1urDdAnAJK9bRlpZ5On90BSDWrsobzIAzaTeJmVoG0T3 rmpP6BKKS6dnA== From: Thomas Gleixner To: "Verma, Vishal L" , "peterz@infradead.org" Cc: "kvm@vger.kernel.org" , "Edgecombe, Rick P" , "Wu, Binbin" , "x86@kernel.org" Subject: Re: CPU Lockups in KVM with deferred hrtimer rearming In-Reply-To: References: <70cd3e97fbb796e2eb2ff8cd4b7614ada05a5f24.camel@intel.com> <87mryxekxy.ffs@tglx> Date: Tue, 21 Apr 2026 00:19:18 +0200 Message-ID: <87se8pcm1l.ffs@tglx> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Mon, Apr 20 2026 at 20:57, Verma, Vishal L wrote: > On Mon, 2026-04-20 at 17:00 +0200, Thomas Gleixner wrote: >>=20 >> This code should never be reached with a rearm pending. Something else >> went wrong earlier. So while the patch "works" it papers over the >> underlying problem. >>=20 >> Can you please do the following: >>=20 >> =C2=A0=C2=A0=C2=A0 1) Apply the patch below >>=20 >> =C2=A0=C2=A0=C2=A0 2) Enable function tracing and the hrtimer* trace eve= nts >>=20 >> =C2=A0=C2=A0=C2=A0 3) Enable tracing if it has been disabled already >>=20 >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 echo 1 >/sys/kernel/tracing/tracing= _on >>=20 >> =C2=A0=C2=A0=C2=A0 4) Run the tests and wait for /sys/kernel/tracing/tra= cing_on to >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 become 0, which means the problem t= riggered. >>=20 >> =C2=A0=C2=A0=C2=A0 5) Retrieve the trace from /sys/kernel/tracing/trace = and provide it >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 somewhere to download from or send = it to me compressed offlist. > > Hi Thomas, > > I've uploaded the trace here (~75MB compressed): > https://drive.proton.me/urls/B9PY61XQ0C#07XwTVhE46eB > > As for: > > 1f5ffc672165 ("Fix mismerge of the arm64 / timer-core interrupt handling = changes") > > I already had that commit in the branch that was tested and it didn't > fix it. Thanks for the update. Can you try to provide the information I asked for above? Thanks, tglx