From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 C0281148838 for ; Sat, 19 Jul 2025 21:17:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752959848; cv=none; b=k542O5kWwFrZXQ+GXh6UxCuJMVBVaYl/B3LAUv7IgytH3V7MA8Xl0lN2QEp9vLxKLieWxpXUGlgNPP5LJHeEl3krIplFflRIZA7w/x9uqNHIYMMBColZjUbE2qFHmn+dAtMB6pTGcUo59X8BJmVTCCSy+m5YNd5dj8tqZnp6ULE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752959848; c=relaxed/simple; bh=J9eoBaDQVC0xDb6mwaI4YMmNU6lqSGRDVuceK9AR/Ok=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=djPafJuMZa9S28aWki6gsd7IZP592fTycRRg0kaElmFro5dlDpxFOiVSReO59LlQxeheEOfMvuxj7utdC85nhnmzkamDAhVUWNJfotAFI7fDEOFka5oPM/KQxY5Pl2963XXn1rA1d/CYrE/H5CAj1OUTxSneiLJ4do7nCepWLoY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=UCMEkicg; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=taVGBjyM; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="UCMEkicg"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="taVGBjyM" From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1752959844; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=oFcvEnugLvV2961ov3yXEloBN8oXe/mIU9Hb11/Ub8s=; b=UCMEkicgRAaJYnzgEfRr/kshTFiJNmDSuqaiklmZ3YCWBUMQ8glH9uJAleXe4tzVD1/sUV sPJGhF+0BDF56tO31AFN12dEvDsDROEhUaW9Lpe4wdPIArYXgjU2Gp7FlA3MudDaXshyHO ZsrH8W5OXPUV6w8cSzuQDioCiiFFrrsxhMc6E40TrQecE4xYEufdKCEUeHLgGTxRYY3nvz TbOH7e2EPY8U31RGWFiYifOgt/CglO8QXKLYTjVcxmKbHFNBohvkO/ehNA/ZbGHsvQz2AZ e15Vb8k3iVGtF9sXlR8t9j2OMvCIrKhnu4iuMQ1uBe0y10UUctLSDtXxDOI+OQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1752959844; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=oFcvEnugLvV2961ov3yXEloBN8oXe/mIU9Hb11/Ub8s=; b=taVGBjyMHxwLgnAyTHFS5ZDZ4iRVx0QOFSdXB93CS7SyJJdzzzf79T++weQ7MiZAOyhuST r6m49xRxciYi8vAQ== To: Phil Auld Cc: Jan Kiszka , Henning Schild , Peter Zijlstra , x86@kernel.org, linux-kernel@vger.kernel.org, Ingo Molnar , Borislav Petkov , Guenter Roeck , xenomai@xenomai.org, guocai.he.cn@windriver.com, pauld@redhat.com Subject: Re: sched: Unexpected reschedule of offline CPU#2! In-Reply-To: <20250709134401.GA675435@lorien.usersys.redhat.com> References: <20190729101349.GX31381@hirez.programming.kicks-ass.net> <20190729104745.GA31398@hirez.programming.kicks-ass.net> <20190729205059.GA1127@roeck-us.net> <20190816193208.GA29478@roeck-us.net> <20210727100018.19d61165@md1za8fc.ad001.siemens.net> <745f219e-1593-4fbd-fa7f-1719ef6f444d@siemens.com> <8734mg92pt.ffs@tglx> <20250709134401.GA675435@lorien.usersys.redhat.com> Date: Sat, 19 Jul 2025 23:17:23 +0200 Message-ID: <87frervq1o.ffs@tglx> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Wed, Jul 09 2025 at 09:44, Phil Auld wrote: > Hi Thomas, > > On Tue, Sep 03, 2024 at 05:27:58PM +0200 Thomas Gleixner wrote: >> On Tue, Jul 27 2021 at 10:46, Jan Kiszka wrote: >> >> Picking up this dead thread again. > > Necro-ing this again... > > I keep getting occasional reports of this case. Unfortunately > though, I've never been able to reproduce it myself. > > Did the below patch ever go anywhere? Nope. Guocai said it does not work and I have no reproducer either to actually look at it deeper and there was further debug data provided. > It seems to be stable in my testing with the addition of > an "extern" in asm/cpu.h to get it to build. I don't see why it wouldn't be stable, but as it does not seem to solve the issue merging it as is does not make sense. Thanks, tglx