From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f197.google.com (mail-io0-f197.google.com [209.85.223.197]) by kanga.kvack.org (Postfix) with ESMTP id 8D5D86B0038 for ; Wed, 30 Nov 2016 13:21:52 -0500 (EST) Received: by mail-io0-f197.google.com with SMTP id r94so28385915ioe.7 for ; Wed, 30 Nov 2016 10:21:52 -0800 (PST) Received: from mail1.merlins.org (magic.merlins.org. [209.81.13.136]) by mx.google.com with ESMTPS id 65si48457909ioc.133.2016.11.30.10.21.51 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 30 Nov 2016 10:21:52 -0800 (PST) Date: Wed, 30 Nov 2016 10:21:44 -0800 From: Marc MERLIN Message-ID: <20161130182144.xhnmgpsyyv423pqw@merlins.org> References: <20161123063410.GB2864@dhcp22.suse.cz> <20161128072315.GC14788@dhcp22.suse.cz> <20161129155537.f6qgnfmnoljwnx6j@merlins.org> <20161129160751.GC9796@dhcp22.suse.cz> <20161129163406.treuewaqgt4fy4kh@merlins.org> <20161129174019.fywddwo5h4pyix7r@merlins.org> <20161130174713.lhvqgophhiupzwrm@merlins.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Subject: Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds Cc: Kent Overstreet , Tejun Heo , Jens Axboe , Michal Hocko , Vlastimil Babka , linux-mm , LKML , Joonsoo Kim , Greg Kroah-Hartman On Wed, Nov 30, 2016 at 10:14:50AM -0800, Linus Torvalds wrote: > Anyway, none of this seems new per se. I'm adding Kent and Jens to the > cc (Tejun already was), in the hope that maybe they have some idea how > to control the nasty worst-case behavior wrt workqueue lockup (it's > not really a "lockup", it looks like it's just hundreds of workqueues > all waiting for IO to complete and much too deep IO queues). I'll take your word for it, all I got in the end was Kernel panic - not syncing: Hard LOCKUP and the system stone dead when I woke up hours later. > And I think your NMI watchdog then turns the "system is no longer > responsive" into an actual kernel panic. Ah, I see. Thanks for the reply, and sorry for bringing in that separate thread from the btrfs mailing list, which effectively was a suggestion similar to what you're saying here too. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org