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 BCF122C19E for ; Tue, 16 Jul 2024 07:36:49 +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=1721115411; cv=none; b=Y9hU89CF8h+FYsy5s31UQyMV8SZr+FVScsxgRnR9ftQcnyvEK3Y9v8uSQxLGDueioMn9MUs6APhSEAChoSUmWU+jj/IuGjeT+7AOqPhGNV9kDNggC8EPRVdRSDLNj4M2Iz18+xfIhIgXL9hLKTL8TcNEF5ZtlpA/FgeWO/KhOXQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721115411; c=relaxed/simple; bh=AcwgECalwiRlLB4Ju4NRdeNfjCCveD44v/AW/VpfCWI=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=IdraMjWiPZHvcxorhbBstokEO8/RHD6qWdCBJgKlrvpDj0/WZ6i6Oz4eyPaA0qOEYMDGYvqjm3i4wQnLs4g6XOH//olfnPeeQeLZZry2RNTvOljoL0EgPhG0442c7QmQBBJq7zZ12sUCk+BfBAJkyGEFS+5u4cH0OPf9rRLJ0F4= 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=axVKom0m; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=rLsd0uKS; 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="axVKom0m"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="rLsd0uKS" From: Anna-Maria Behnsen DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1721115407; 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=uDxF9sSe/k93/H0Tzst8MDwBRBa53lTAMgOiYTVdhDI=; b=axVKom0mL0uXqVnW/22leBnXYuECaD0xUu0QU12dUQq3nS0jQcI7SBKhFQPKOJTMP016Wv miEdpXSJGjtBJ3hCVwcds8Syu4iSBtxr25AmF+Ft1NLzkRoPNzXO270lsaymm0QHR+Lr+s fF0CBBOIrEjngl6P/7BE5kqIGYSdqnH9pngPPAtzYW8EPwm9FjewY+zjU+SdddgFlzP6OW 1x0hZp0Wj+LXhW+dSRFyM//lyB+msC1SDIZhu5SSI+YRd0J3A7zrviE0kYAN8NmVxzaxHu lHrvd8BF5QNHxjTv0a+9sl+r4yEwvmV6WMeKr/XeJfVi8VS/bqAj/s6im3dF6A== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1721115407; 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=uDxF9sSe/k93/H0Tzst8MDwBRBa53lTAMgOiYTVdhDI=; b=rLsd0uKSrVOqOD5prV9wTYcuO6dHemlRUfx7t4dSL223Je23MD6HcZlQX3lXhnCN4mtpIy 62zjbjv/zaERESBQ== To: paulmck@kernel.org, kernel test robot Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org, Thomas Gleixner , Frederic Weisbecker Subject: Re: [tip:timers/urgent] [timers/migration] 8cdb61838e: WARNING:at_kernel/time/timer_migration.c:#tmigr_connect_child_parent In-Reply-To: <68204aba-dc0a-47dc-902b-76d6553e17de@paulmck-laptop> References: <202407101636.d9d4e8be-oliver.sang@intel.com> <68204aba-dc0a-47dc-902b-76d6553e17de@paulmck-laptop> Date: Tue, 16 Jul 2024 09:36:47 +0200 Message-ID: <87ikx53i0g.fsf@somnus> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Hi Paul, "Paul E. McKenney" writes: > On Wed, Jul 10, 2024 at 04:37:00PM +0800, kernel test robot wrote: >> >> >> Hello, >> >> kernel test robot noticed "WARNING:at_kernel/time/timer_migration.c:#tmigr_connect_child_parent" on: >> >> commit: 8cdb61838ee5c63556773ea2eed24deab6b15257 ("timers/migration: Move hierarchy setup into cpuhotplug prepare callback") >> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git timers/urgent > > For whatever it is worth, I am also seeing this on refscale runs on > recent -next. > > The reproducer is to clone perfbook [1] in your ~/git directory > (as in ~/git/perfboot), then run this from your Linux source tree, > preferably on a system with few CPUs: > > bash ~/git/perfbook/CodeSamples/defer/rcuscale.sh > > The output will have "FAIL" in it, which indicates that the corresponding > guest OS splatted. If it would be useful, I would be happy to produce > a one-liner that runs the guest OS only once and leaves the console > output around. Otherwise, I will continue being lazy. ;-) Thanks for the report. I found the root cause for it and I am working on a fix as the commit which triggers the warning also has another problem... And I already requested to drop the tip timers/urgent patches (at least my patches). So, enjoy being lazy! Thanks, Anna-Maria