From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 16679130E57 for ; Thu, 4 Apr 2024 23:39:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712273997; cv=none; b=jqNOypWjQsErVWWiAV9ptnLEZi7rVSrVGNHS369Df88TIc0cxTGrHNdHAVPur9RRJVza/xZoLLg7Tq9EKODcpioXTBnkC+6WTsIdAUmzmbXwP+CJiHCxkXl3c/uRkhmgP3vy9v5kbgMi5Qb3cuhPFADji4oooZ70SLoz3I1oDK4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712273997; c=relaxed/simple; bh=6HKfD/8wmlZgXYXrjxJELPl80JlkIWJruUR23ZSPDdI=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=WMy1k2BrNLqL3G1oG1MvZtmO01xP4n+8/N2HhrUhqh2bzt5Lsu08Wj49ngeWBZdEvxk7d0K7WfX3S3E2m6aG8iC8EogUpEVUCFa1yTJtWxzthL2AqSPcQu3BIzqYLWIKPAoM6hjtK1Uu9HWRuQeyqzEK4kbwsDA+bLURoc5Wf1Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=RgvtSSc4; arc=none smtp.client-ip=198.175.65.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="RgvtSSc4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1712273996; x=1743809996; h=date:from:to:subject:message-id:references:mime-version: in-reply-to; bh=6HKfD/8wmlZgXYXrjxJELPl80JlkIWJruUR23ZSPDdI=; b=RgvtSSc4AH20TWads1rZRBBpiPjug+VDbCgVPyTPjmporsNKClg+QPVx HkV/LHy7e/M9l+AJ5OP1i4oBD9hJPjxIZLMfRnO2yR9dB73DEoI46LhPE 41N5KOVcjtcvZdrg4mwavBlUdTCfg1CKmnSh772goKb6ntrgx398ewHGP j60p3WRoHjLchcEYIX3kLIgVIjJHP+VLQ/22bZmTlXAnAzfGuokfYqfzD STbvbYNmbHhwK7ph5WgAHdkiA3rBaKb0fzB5qraVyu1HQ7K5DQxE/xvJf 1FSk8jZPk6DhhoqNec2L5CGR8NeLEDRGMRw0A/2WernDXszViO/DxBpBd g==; X-CSE-ConnectionGUID: YSwh2PTMQS6L/nL7I3ukeg== X-CSE-MsgGUID: 3jxbTN64R3+gp2y0nb81AA== X-IronPort-AV: E=McAfee;i="6600,9927,11034"; a="7695095" X-IronPort-AV: E=Sophos;i="6.07,180,1708416000"; d="scan'208";a="7695095" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Apr 2024 16:39:55 -0700 X-CSE-ConnectionGUID: am/1XBW/SAuPaS37RMPlYg== X-CSE-MsgGUID: 0IaJQNE3SrSq6TfqMkDnkg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,180,1708416000"; d="scan'208";a="23616329" Received: from agluck-desk3.sc.intel.com (HELO agluck-desk3) ([172.25.222.105]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Apr 2024 16:39:55 -0700 Date: Thu, 4 Apr 2024 16:39:53 -0700 From: Tony Luck To: Borislav Petkov , Yazen Ghannam , Miaohe Lin , Naoya Horiguchi , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: Machine check recovery broken in v6.9-rc1 Message-ID: References: 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-Disposition: inline In-Reply-To: On Thu, Apr 04, 2024 at 03:05:33PM -0700, Tony Luck wrote: > v6.8 works. v6.9-rc1 fails with: > > kernel BUG at include/linux/swapops.h:119 > > 117 static inline unsigned long swp_offset_pfn(swp_entry_t entry) > 118 { > 119 VM_BUG_ON(!is_pfn_swap_entry(entry)); > 120 return swp_offset(entry) & SWP_PFN_MASK; > 121 } > > > I've messed up the bisection three times now and ended up > pointing at some innocent looking commit. So I wonder if > anyone else has noticed and tried debugging. I think I know why I messed up the bisection. I thought the failure happens every time. But it seems that it only happens most of the time. I must have accidentally marked a build as "good" because I got "lucky" and my test passed. Back to the bisect grindstone :-( -Tony