From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7101CC6778A for ; Tue, 24 Jul 2018 06:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D398120852 for ; Tue, 24 Jul 2018 06:11:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D398120852 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.ee Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388313AbeGXHQX (ORCPT ); Tue, 24 Jul 2018 03:16:23 -0400 Received: from smtp2.it.da.ut.ee ([193.40.5.67]:57462 "EHLO smtp2.it.da.ut.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388146AbeGXHQX (ORCPT ); Tue, 24 Jul 2018 03:16:23 -0400 Received: from math.ut.ee (unknown [IPv6:2001:bb8:2002:2400:5054:ff:fe3b:8db9]) by smtp2.it.da.ut.ee (Postfix) with ESMTP id A0B7B9005D; Tue, 24 Jul 2018 09:11:31 +0300 (EEST) Received: by math.ut.ee (Postfix, from userid 1014) id 84504220910; Tue, 24 Jul 2018 09:11:29 +0300 (EEST) Received: from localhost (localhost [127.0.0.1]) by math.ut.ee (Postfix) with ESMTP id 8C1C9220665; Tue, 24 Jul 2018 09:11:29 +0300 (EEST) Date: Tue, 24 Jul 2018 09:11:29 +0300 (EEST) From: Meelis Roos To: Daniel Borkmann cc: Arnd Bergmann , Linux Kernel list , Networking Subject: Re: bisected: 4.18-rc* regression: x86-32 troubles (with timers?) In-Reply-To: <4a48811d-4094-ee4c-33ca-2cf0446a6313@iogearbox.net> Message-ID: References: <32227088-7754-c160-8046-e860f42ca91c@iogearbox.net> <4a48811d-4094-ee4c-33ca-2cf0446a6313@iogearbox.net> User-Agent: Alpine 2.21 (LRH 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > >> I would be curious as well about that whether revert would make it > >> work. What's the value of sysctl net.core.bpf_jit_enable ? Does it > >> change anything if you set it to 0 (only interpreter) or 1 (JIT > >> enabled). Seems a bit strange to me that bisect ended at this commit > >> given the issue you have. The JIT itself was also new in this window > >> fwiw. In any case some more debug info would be great to have. > > > > net.core.bpf_jit_enable is 1. > > > > Since it breaks bootup, I can not easily change the value at runtime (it > > would be postfactum). Do you mean changing the > > CONFIG_BPF_JIT_ALWAYS_ON=y option? > > Yeah if you chance it to N, and don't have any fixed /etc/sysctl.conf > setting, then you'll boot up with interpreter first (net.core.bpf_jit_enable > as 0). Curious whether that works just fine for you. Disabled CONFIG_BPF_JIT_ALWAYS_ON on v4.18-rc5 and it works, tested on 2 bootups. -- Meelis Roos (mroos@linux.ee)