From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793997339; b=ny1XWYI2N0Ll9hdE5Yze3uF18PO/OD3nWBsX2zls1JFD7yKpgnSlcb63gQkAfmYT5xLd LDErUqAFweGH6vof8nD63cFFzJTLXJrxJMabjCR812I0uiB1pTNbNbkPrrHPwKgd5KnFT OTscdxNr2Otk/0OfiI4SiE64gkcQrMaTOllX5hxt6GlHgIydfa3+RroEaS0oi7bIInCH6 EkzR50EOQhinQTIo2Z4D/kUJ24Bn6/X3DIpVXTvRG84qQJ3EkwhNU0C5cy+bsdMSbgfrT JK8E/tgaiSLUtcqtrUkFutyu7CQ6Cq89tzDJ1loq/WGZSz/FtoumEc0LS2pJJxZuPEw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793997339; h=Received:DKIM-Signature:From:To:Cc:Subject:In-Reply-To:References: Date:Message-ID:MIME-Version:Content-Type; bh=Ej5ViQLjc0HeyXNxFhpTSJoKBBRXm9gCVJ/qysZMi6g=; b=t56uDtZSrRQbYpkPAk4cdntWNsU64oySOIFRX0YJK/eoetU51SVSX51ojoht1bpbNUzB 77Jq0OcRN7QtDkylOujIdCc+OvTE9tRHym78JV6UYSmxmaRZYlcNcf9Q/p1c1qmT7wwpm 1UNgW9cU9bGNhimg7cos3O1NptbhOzaDs9OBTJIZ+VG/jnsmL9Q99oZwdhFWNTExvKoIR w5BaHPMfKv58GpP98314djrIQMy/476SZy373PP5zOc3RUKLy2OI19XXQDgsYRMy36h8a nd9CYLe++Rb9ReYRNN3FAA9rpDMjvvZ0TtGQCrYnlZ0JWsfxCW5xqpT25Md/aGPxT4A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=XCGr5zRS; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C4DB606A326; Fri, 6 Nov 2026 20:35:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=XCGr5zRS Received: by smtp.kernel.org (Postfix) with ESMTPSA id 485ED1F008A3; Fri, 6 Nov 2026 20:35:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793997338; bh=Ej5ViQLjc0HeyXNxFhpTSJoKBBRXm9gCVJ/qysZMi6g=; h=From:To:Cc:Subject:In-Reply-To:References:Date; b=XCGr5zRSLpT6x5RIcnePNDxij6ETnBJeYK/oKzyoyoA6I5yfAlhzaksmTFVEKKptW ve30u0xR4IRFK2bdk3o/2sdFlmG2x6KbYqXAdXYplMyP5GUzBxoyZj5s+8tJVn0vwQ 4KN8XLqBlAl/4ECcD27tA+aw3ftlBFMpZso78CFsj5q7UnLeRA8J++gLZwCnZwnv0F H4md1xkptFmaCYeExQ/nF1eJeLrVTyge2uWsdzycyZwUNTi9N5/l2e7EAE2T8Sp1kj CK8DADkOEe9wgckwLhtLrHfiLH4egCd5kJ28Z1iAxpNhkkU8F00sHk+MhgG3KD5RhD MEABmrJ6lAERg== From: Thomas Gleixner To: Mani Tofigh , Mani Tofigh via B4 Relay , John Stultz Cc: Stephen Boyd , Miroslav Lichvar , Srikanth Aithal , Borislav Petkov , K Prateek Nayak , linux-kernel@vger.kernel.org, tz2294@columbia.edu, stable@vger.kernel.org Subject: Re: [PATCH] clocksource: Use the clocksource under test for the skew check timeout In-Reply-To: References: <20261102-clocksource-skew-timeout-v1-1-4ff412918591@columbia.edu> <878q39y8da.ffs@fw13> Date: Fri, 06 Nov 2026 21:35:36 +0100 Message-ID: <87zevlwvdz.ffs@fw13> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain On Thu, Nov 05 2026 at 15:22, Mani Tofigh wrote: > On 11/3/26 3:20 PM, Thomas Gleixner wrote: >> So your reproducer does: >> >> while true; do echo 0 >/sys/devices/system/cpu/cpu1/online; echo 1 >/sys/devices/system/cpu/cpu1/online; done >> >> right? >> > Yes, but on a kernel booted with clocksource=jiffies. I did so too and it did not happen within a couple of hours :( >> Can you and Srikanth please run that on top to validate that we don't >> end up with that? > I ran my patch with your delta in the same guest and it holds up well. > No hang and no "stalled" warning (even though the remote read timed out > a lot during the loop). > > Do you want the delta in v2? I can carry it as a separate patch from you > or fold it into mine, whatever you prefer. Just fold it in. It makes sense in that context. Thanks, tglx