From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Rak Subject: Re: Repeatable IPv6 crash in 3.19.0-1 Date: Fri, 27 Feb 2015 21:11:16 -0500 Message-ID: <54F123C4.2030907@vultr.com> References: <54F0E38C.5060203@vultr.com> <1425084533.5130.54.camel@edumazet-glaptop2.roam.corp.google.com> <1425086169.5130.57.camel@edumazet-glaptop2.roam.corp.google.com> <54F11FC8.7010100@vultr.com> <1425088894.5130.60.camel@edumazet-glaptop2.roam.corp.google.com> <1425089025.5130.61.camel@edumazet-glaptop2.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Eric Dumazet Return-path: Received: from mail.choopa.net ([216.155.136.52]:60115 "EHLO mail.choopa.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750831AbbB1CLQ (ORCPT ); Fri, 27 Feb 2015 21:11:16 -0500 In-Reply-To: <1425089025.5130.61.camel@edumazet-glaptop2.roam.corp.google.com> Sender: netdev-owner@vger.kernel.org List-ID: On 2/27/2015 9:03 PM, Eric Dumazet wrote: > On Fri, 2015-02-27 at 18:01 -0800, Eric Dumazet wrote: >> On Fri, 2015-02-27 at 20:54 -0500, Brian Rak wrote: >> >>> Wow, that was *much* faster then I was expecting, thanks a bunch! >>> >>> I can confirm that resolves the issue.. I've tested this and it fixes >>> the issue perfectly. I've been able to put a whole bunch of IPv6 >>> traffic through the interface now, whereas before even a minor amount of >>> traffic would crash the host. >>> >>> Thanks again! >> >> Interesting... >> >> Had a prior version of linux kernel been fine ? > > Or maybe you recently switched on this config option ? > > CONFIG_DEBUG_PAGEALLOC=y > > > We've only recently started using this veth/macvtap combo, so it's possible this has been around for awhile and we just hadn't noticed. I don't have any info on older kernels currently. I *think* I've seen crashes on 3.17.1, but I didn't save any stack traces, so I can't be sure. CONFIG_DEBUG_PAGEALLOC is not set, and never has been.