Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756122Ab3ETQPC (ORCPT ); Mon, 20 May 2013 12:15:02 -0400 Received: from mail-qc0-f176.google.com ([209.85.216.176]:41695 "EHLO mail-qc0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755340Ab3ETQO5 (ORCPT ); Mon, 20 May 2013 12:14:57 -0400 Date: Mon, 20 May 2013 12:19:17 -0400 (EDT) From: Vince Weaver To: linux-kernel@vger.kernel.org cc: Peter Zijlstra , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , trinity@vger.kernel.org Subject: WARN_ONCE in arch/x86/kernel/hw_breakpoint.c Message-ID: User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) 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 Content-Length: 3108 Lines: 43 Hello on 3.10-rc1 with the trinity fuzzer patched to exercise the perf_event_open() syscall I am triggering this WARN_ONCE: [ 75.864822] ------------[ cut here ]------------ [ 75.864830] WARNING: at arch/x86/kernel/hw_breakpoint.c:121 arch_install_hw_breakpoint+0x5b/0xcb() [ 75.864832] Can't find any breakpoint slot [ 75.864833] Modules linked in: dn_rtmsg can_raw nfnetlink can_bcm can xfrm_user xfrm_algo nfc rfkill ax25 scsi_transport_iscsi atm ipt_ULOG x_tables ipx p8023 p8022 irda crc_ccitt appletalk psnap llc nfsd auth_rpcgss oid_registry nfs_acl nfs lockd dns_resolver fscache sunrpc loop fuse snd_hda_codec_hdmi snd_hda_codec_realtek coretemp kvm_intel kvm evdev nouveau mxm_wmi ttm drm_kms_helper video wmi drm i2c_algo_bit microcode snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq snd_seq_device snd_timer snd acpi_cpufreq mperf processor thermal_sys psmouse serio_raw pcspkr button soundcore shpchp i2c_nforce2 i2c_core ext4 crc16 jbd2 mbcache sg sd_mod crc_t10dif ata_generic ahci libahci ehci_pci ohci_hcd ehci_hcd libata r8169 mii scsi_mod usbcore usb_common [ 75.864890] CPU: 0 PID: 3136 Comm: trinity-child0 Not tainted 3.10.0-rc1 #1 [ 75.864892] Hardware name: AOpen DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015 10/19/2012 [ 75.864894] 0000000000000000 ffffffff8102e205 ffff880119b01c98 ffff880119abac00 [ 75.864897] ffff880119b01ce8 ffff88011fc15b28 0000000ed19e90a3 ffffffff8102e2b0 [ 75.864900] ffffffff814db382 0000000200000018 ffff880119b01cf8 ffff880119b01cb8 [ 75.864903] Call Trace: [ 75.864907] [] ? warn_slowpath_common+0x5b/0x70 [ 75.864910] [] ? warn_slowpath_fmt+0x47/0x49 [ 75.864913] [] ? sched_clock_local+0xc/0x6d [ 75.864916] [] ? arch_install_hw_breakpoint+0x5b/0xcb [ 75.864919] [] ? event_sched_in+0x68/0x11c [ 75.864921] [] ? group_sched_in+0x46/0x120 [ 75.864923] [] ? ctx_sched_in+0x123/0x141 [ 75.864926] [] ? __perf_install_in_context+0xcb/0xea [ 75.864929] [] ? perf_swevent_add+0xb8/0xb8 [ 75.864932] [] ? remote_function+0x13/0x3b [ 75.864934] [] ? smp_call_function_single+0x76/0xf1 [ 75.864937] [] ? task_function_call+0x42/0x4c [ 75.864939] [] ? perf_event_sched_in+0x69/0x69 [ 75.864942] [] ? perf_install_in_context+0x5b/0x97 [ 75.864945] [] ? SYSC_perf_event_open+0x65f/0x7d4 [ 75.864949] [] ? system_call_fastpath+0x16/0x1b [ 75.864951] ---[ end trace 250def16d8853b8c ]--- Is this condition really drastic enough to deserve a WARNing? Vince Weaver vincent.weaver@maine.edu http://www.eece.maine.edu/~vweaver/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/