Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752953AbeADU3M (ORCPT + 1 other); Thu, 4 Jan 2018 15:29:12 -0500 Received: from mail-io0-f180.google.com ([209.85.223.180]:34324 "EHLO mail-io0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752544AbeADU3J (ORCPT ); Thu, 4 Jan 2018 15:29:09 -0500 X-Google-Smtp-Source: ACJfBottcimUIjRTDgPBCM9u8WR9hq+ijmC0CJwYgsMGmKpfRRwcQnrzOU9TpTlZic0KalWs5Xhi8w5SQjfl0ZmvWqs= MIME-Version: 1.0 In-Reply-To: References: <20180103195056.837404126@linuxfoundation.org> <20180104195055.GA29809@kroah.com> From: Linus Torvalds Date: Thu, 4 Jan 2018 12:29:08 -0800 X-Google-Sender-Auth: bjbCJbRvd1HHw-sCCbap0mW8vC0 Message-ID: Subject: Re: [PATCH 4.4 00/37] 4.4.110-stable review To: Thomas Voegtle , Andy Lutomirski Cc: Greg Kroah-Hartman , Linux Kernel Mailing List , Andrew Morton , Guenter Roeck , Shuah Khan , patches@kernelci.org, Ben Hutchings , lkft-triage@lists.linaro.org, stable Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Thu, Jan 4, 2018 at 12:16 PM, Thomas Voegtle wrote: > > Attached a screenshot. > Is that useful? Are there some debug options I can add? Not much of an oops, because the SIGSEGV happens in user space. The only reason you get any kernel stack printout at all is because 'init' dying will make the kernel print that out. The segfault address for init looks like the fixmap area to me (first byte in the last page of the fixmap?). "Error 5" means that it's a user-space read that got a protection fault. So it's not a LDT of GDT update or anything like that, it's a normal access from user space (or a qemu emulation bug, but that sounds unlikely). Is that the vsyscall page? Adding Luto to the participants. I think he noticed one of the vsyscall patches missing earlier in the 4.9 series. Maybe the 4.4 series had something similar.. Linus