Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965322AbeAKSEX (ORCPT + 1 other); Thu, 11 Jan 2018 13:04:23 -0500 Received: from mail-io0-f177.google.com ([209.85.223.177]:39476 "EHLO mail-io0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965083AbeAKSEV (ORCPT ); Thu, 11 Jan 2018 13:04:21 -0500 X-Google-Smtp-Source: ACJfBovEtzJe4dvm02Oes25GLI0N34ELUor9aRsckgdred+WQbG89DoHCUGO9GnB0dk73gp8id2wdw== From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Thu, 11 Jan 2018 13:04:18 -0500 (EST) X-X-Sender: vince@macbook-air To: Peter Zijlstra cc: Vince Weaver , Ingo Molnar , linux-kernel@vger.kernel.org, Ingo Molnar , Arnaldo Carvalho de Melo , Thomas Gleixner Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7 In-Reply-To: <20180111170347.GG6176@hirez.programming.kicks-ass.net> Message-ID: References: <20180108173005.lkglqrixb2ota6g2@gmail.com> <20180109102507.GG6176@hirez.programming.kicks-ass.net> <20180109132602.GA2369@hirez.programming.kicks-ass.net> <20180111091353.GW6176@hirez.programming.kicks-ass.net> <20180111153845.GD6176@hirez.programming.kicks-ass.net> <20180111170347.GG6176@hirez.programming.kicks-ass.net> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: on the same core2 machine I got this which didn't crash the machine (but the perf_fuzzer process is stuck) [ 4592.608066] INFO: task systemd-logind:488 blocked for more than 120 seconds. [ 4592.615159] Not tainted 4.15.0-rc7+ #211 [ 4592.619648] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 4592.627512] systemd-logind D 0 488 1 0x80000006 [ 4592.633039] Call Trace: [ 4592.635529] ? __schedule+0x35d/0x507 [ 4592.639239] ? usleep_range+0x51/0x51 [ 4592.642948] ? schedule+0x7b/0x84 [ 4592.646310] ? schedule_timeout+0x21/0xc7 [ 4592.650368] ? ttwu_do_wakeup+0x19/0x10d [ 4592.654339] ? do_wait_for_common+0xfe/0x12f [ 4592.658653] ? wake_up_q+0x40/0x40 [ 4592.662106] ? wait_for_common+0x35/0x3f [ 4592.666075] ? __wait_rcu_gp+0xe9/0xfa [ 4592.669872] ? synchronize_sched+0x3e/0x43 [ 4592.674019] ? call_rcu_bh+0x13/0x13 [ 4592.677641] ? trace_raw_output_rcu_utilization+0x42/0x42 [ 4592.683086] ? evdev_release+0x81/0xcf [evdev] [ 4592.687578] ? __fput+0xdf/0x18f [ 4592.690852] ? task_work_run+0x6b/0x7f [ 4592.694650] ? do_exit+0x4b1/0x994 [ 4592.698103] ? __perf_event_task_sched_out+0x62/0x302 [ 4592.703200] ? do_group_exit+0x3b/0xa9 [ 4592.707000] ? get_signal+0x490/0x50b [ 4592.710714] ? do_signal+0x23/0x5ea [ 4592.714249] ? schedule_hrtimeout_range_clock+0x38/0xcf [ 4592.719521] ? ep_scan_ready_list+0x176/0x195 [ 4592.723926] ? SYSC_epoll_wait+0x2ea/0x39d [ 4592.728074] ? prepare_exit_to_usermode+0xd1/0x102 [ 4592.732913] ? entry_SYSCALL_64_fastpath+0x6e/0x70 [ 4601.468052] INFO: rcu_sched detected stalls on CPUs/tasks: [ 4601.473590] 1-...0: (1 GPs behind) idle=74e/140000000000000/0 softirq=139228/139229 fqs=28744 [ 4601.482338] (detected by 0, t=60007 jiffies, g=67462, c=67461, q=1637) [ 4601.488996] Sending NMI from CPU 0 to CPUs 1: