From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753017AbcFCV1r (ORCPT ); Fri, 3 Jun 2016 17:27:47 -0400 Received: from mail.kernel.org ([198.145.29.136]:33168 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751818AbcFCV1p (ORCPT ); Fri, 3 Jun 2016 17:27:45 -0400 Date: Fri, 3 Jun 2016 18:27:40 -0300 From: Arnaldo Carvalho de Melo To: Peter Zijlstra Cc: Ingo Molnar , Jiri Olsa , David Ahern , Namhyung Kim , Wang Nan , Andi Kleen , Linux Kernel Mailing List Subject: Re: perf crash with tip/perf/core Message-ID: <20160603212740.GA2963@kernel.org> References: <20160603211515.GC3095@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160603211515.GC3095@kernel.org> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.6.1 (2016-04-27) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Fri, Jun 03, 2016 at 06:15:15PM -0300, Arnaldo Carvalho de Melo escreveu: > Hi Peter, > > I built what is in tip/perf/core to test the topdown patches > from Andi but it is crashing on me, 'perf stat' was ok, but then I tried > 'perf trace' and got the NULL deref below, bet 'perf record' will do the same. Yeah, just tried with 'perf record usleep 1' and got: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] __list_del_entry+0x29/0xc0 PGD 1249ea067 PUD 1249e9067 PMD 0 Oops: 0000 [#1] SMP Modules linked in: hidp rfcomm fuse cmac xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_addrtype br_netfilter tun nf_conntrack_netbios_ns nf_conntrack_broadcast dm_thin_pool dm_persistent_data dm_bio_prison libcrc32c loop ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_broute bridge stp llc ebtable_filter ebtable_nat ebtables ip6table_mangle ip6table_raw ip6table_security ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bnep arc4 iwlmvm mac80211 intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm iwlwifi irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel intel_cstate mei_wdt iTCO_wdt cfg80211 iTCO_vendor_support uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev i2c_i801 snd_hda_codec_realtek pcspkr snd_seq rtsx_pci_ms intel_pch_thermal snd_hda_codec_hdmi snd_hda_codec_generic btusb lpc_ich btrtl mei_me snd_hda_intel memstick media snd_hda_codec joydev snd_seq_device mei btbcm shpchp btintel snd_hda_core bluetooth snd_hwdep snd_pcm nfsd snd_timer thinkpad_acpi snd soundcore rfkill auth_rpcgss tpm_tis tpm wmi intel_rst nfs_acl lockd grace sunrpc binfmt_misc i915 i2c_algo_bit drm_kms_helper rtsx_pci_sdmmc mmc_core drm e1000e crc32c_intel rtsx_pci serio_raw ptp pps_core fjes video CPU: 1 PID: 3572 Comm: perf Not tainted 4.6.0+ #2 Hardware name: LENOVO 20BX001LUS/20BX001LUS, BIOS JBET49WW (1.14 ) 05/21/2015 task: ffff8801fe7e3b00 ti: ffff8801249d8000 task.ti: ffff8801249d8000 RIP: 0010:[] [] __list_del_entry+0x29/0xc0 RSP: 0018:ffff8801249dbdd8 EFLAGS: 00010207 RAX: 0000000000000000 RBX: ffff8800a8dfc000 RCX: dead000000000200 RDX: 0000000000000000 RSI: ffff88023dc9a820 RDI: ffff8800a8dfc468 RBP: ffff8801249dbdd8 R08: ffff8800a8dfc010 R09: ffff8800a8dfc020 R10: ffff880233990fc0 R11: ffff88007fa3c310 R12: ffff88023dc90980 R13: ffff8801fe7e4380 R14: ffff8800a8dfc268 R15: ffff8800a8dfc248 FS: 00007fbac60d1780(0000) GS:ffff88023dc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001249e7000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801249dbdf8 ffffffff811a6691 ffff8800a8dfc000 ffff8800a8dfc220 ffff8801249dbe08 ffffffff811a6c14 ffff8801249dbe50 ffffffff811a6e01 ffff8800a8dfc248 ffff8800a8dfc000 ffff88007fa3c300 0000000000000008 Call Trace: [] _free_event+0x221/0x320 [] put_event+0x14/0x20 [] perf_event_release_kernel+0x1e1/0x260 [] perf_release+0x10/0x20 [] __fput+0xdf/0x1f0 [] ____fput+0xe/0x10 [] task_work_run+0x73/0x90 [] exit_to_usermode_loop+0xc2/0xd0 [] syscall_return_slowpath+0xa1/0xb0 [] entry_SYSCALL_64_fastpath+0xa2/0xa4 Code: 66 90 55 48 8b 07 48 b9 00 01 00 00 00 00 ad de 48 8b 57 08 48 89 e5 48 39 c8 74 29 48 b9 00 02 00 00 00 00 ad de 48 39 ca 74 3a <4c> 8b 02 4c 39 c7 75 52 4c 8b 40 08 4c 39 c7 75 66 48 89 50 08 RIP [] __list_del_entry+0x29/0xc0 RSP CR2: 0000000000000000 ---[ end trace 1257c98b7b352b79 ]---