From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ivanoab7.miniserver.com ([37.128.132.42] helo=www.kot-begemot.co.uk) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1lEsb1-0006Cg-4L for linux-um@lists.infradead.org; Wed, 24 Feb 2021 11:44:48 +0000 Subject: Re: linux uml segfault References: <3448a70e7a39b9c3202aeefa7858ace265b8a978.camel@debian.org> <6d37b5aa-36f2-1fce-b70b-8faa0ff882e0@kot-begemot.co.uk> <529cd4e2f39efffb18125dffab3058aeec3351ce.camel@debian.org> From: Anton Ivanov Message-ID: <573e256a-990b-ddf6-7965-367bb8b21229@kot-begemot.co.uk> Date: Wed, 24 Feb 2021 11:44:39 +0000 MIME-Version: 1.0 In-Reply-To: <529cd4e2f39efffb18125dffab3058aeec3351ce.camel@debian.org> Content-Language: en-US List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: rrs@debian.org, Christopher Obbard , "linux-um@lists.infradead.org" Cc: 983379@bugs.debian.org On 23/02/2021 17:26, Ritesh Raj Sarraf wrote: > Added the debian bug report in CC. > > On Tue, 2021-02-23 at 17:19 +0000, Anton Ivanov wrote: >>> The current Debian user-mode-linux package in unstable is based on >>> the 5.10.5 stable source which includes the mentioned patch, but is >>> still causing an error for some users. >> >> After updating the tree to 5.10.5 and applying all Debian patches >> from the package, I cannot reproduce the bug. >> >> I am running it on 5.10, 5.2 and 4.19 hosts with the same parameters >> without issues. Hosts are all up to date Debian 10.8 and so is the >> UML userspace. >> > > Did you mean 5.10, 5.2 and 4.19 (UML) guests ? > > We've seen this happen on Debian Testing and Unstable Host (of which > the former would soon be the next stable i.e. Debian Bullseye). > > In our tests, when running the same linux uml binary (5.10) on a Debian > Stable Host, it is working fine. I cannot reproduce it on a physical Bullseye host using the Debian user-mode-linux package compiled from source. Environment - Bullseye minimal install and build deps. 6 cores/12 threads Ryzen I cannot reproduce it using the upstream source and the patches from the user-mode-linux package Environment - same as above. I cannot reproduce it using the upstream source + patches and compiling on Buster using the following: 1. Bullseye physical host, minimal install, same hardware 2. Bullseye VM, minimal install, running with 4 vCPUs on the same host 3. Bullseye LXC container running on a Debian Buster host, minimal install, same hardware In all cases it boots cleanly and there are no segfaults. So, frankly, no idea what is causing it to crash - I have run most combinations of 5.10 on a 5.10, all work fine here. -- Anton R. Ivanov https://www.kot-begemot.co.uk/ _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um