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=-1.0 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 1FBD8C46464 for ; Fri, 10 Aug 2018 22:47:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A4560223E3 for ; Fri, 10 Aug 2018 22:47:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A4560223E3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org 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 S1727290AbeHKBTf (ORCPT ); Fri, 10 Aug 2018 21:19:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:37230 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726774AbeHKBTf (ORCPT ); Fri, 10 Aug 2018 21:19:35 -0400 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AAC73223C6; Fri, 10 Aug 2018 22:47:42 +0000 (UTC) Date: Fri, 10 Aug 2018 18:47:40 -0400 From: Steven Rostedt To: LKML Cc: Peter Zijlstra , "Paul E. McKenney" , Joel Fernandes , Ingo Molnar Subject: Warning splat on x86_32 during perf stress Message-ID: <20180810184740.5f8ca46d@gandalf.local.home> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I sometimes trigger this splat in my tests (which cause them to fail), but it's not always hit. Note, this is on x86_32 arch. ------------[ cut here ]------------ IRQs not enabled as expected WARNING: CPU: 0 PID: 0 at /work/build/trace/nobackup/linux-test.git/kernel/time/tick-sched.c:982 tick_nohz_idle_enter+0x44/0x8c Modules linked in: ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipv6 crc_ccitt r8169 ppdev parport_pc parport CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc6-test+ #3 Hardware name: MSI MS-7823/CSM-H87M-G43 (MS-7823), BIOS V1.6 02/22/2014 EIP: tick_nohz_idle_enter+0x44/0x8c Code: e8 05 00 00 00 75 26 83 b8 bc 05 00 00 00 75 1d 80 3d 81 f7 3c c1 00 75 14 68 d6 82 11 c1 c6 05 81 f7 3c c1 01 e8 63 fb f8 ff <0f> 0b 58 fa bb 60 76 65 c1 e8 0d 04 04 00 64 03 1d 28 c1 50 c1 8b EAX: 0000001c EBX: c14803a0 ECX: 00000006 EDX: 00000007 perf: interrupt took too long (12533 > 12527), lowering kernel.perf_event_max_sample_rate to 15000 ESI: c12b8d00 EDI: 01470000 EBP: c12a5f30 ESP: c12a5f28 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010292 CR0: 80050033 CR2: 080a45b0 CR3: 3075b600 CR4: 001406f0 Call Trace: do_idle+0x33/0x1f9 cpu_startup_entry+0x61/0x63 rest_init+0xb2/0xb4 start_kernel+0x3fa/0x410 i386_start_kernel+0x9a/0x9e startup_32_smp+0x164/0x168 irq event stamp: 8712154 hardirqs last enabled at (8712153): [] trace_hardirqs_on_thunk+0xc/0x10 hardirqs last disabled at (8712154): [] trace_hardirqs_off_thunk+0xc/0x10 softirqs last enabled at (8712148): [] __do_softirq+0x258/0x2b8 softirqs last disabled at (8712107): [] call_on_stack+0x45/0x4b ---[ end trace 7bebbaceab0fedbc ]--- This is where I think my patch: http://lkml.kernel.org/r/20180806214107.110626d0@gandalf.local.home would help. As I don't know if IRQs were really enabled, or if lockdep was broken. -- Steve