Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754377AbaAIPrq (ORCPT ); Thu, 9 Jan 2014 10:47:46 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48870 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754106AbaAIPri (ORCPT ); Thu, 9 Jan 2014 10:47:38 -0500 Date: Thu, 9 Jan 2014 10:47:07 -0500 From: Dave Jones To: Linux Kernel Cc: peterz@infradead.org Subject: task_ctx_sched_out WARN_ON triggered. Message-ID: <20140109154707.GB3714@redhat.com> Mail-Followup-To: Dave Jones , Linux Kernel , peterz@infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is my fuzz tester, but this looks to be part of normal operation, not actually fuzzing a syscall. This looks to be the bit that sets the task_comm name in the child process to 'trinity-cN'. Which appears to have succeeded judging by the Comm:, but the follow-on perf stuff seems to be screwed up. WARNING: CPU: 1 PID: 13500 at kernel/events/core.c:2379 task_ctx_sched_out+0x6b/0x80() Modules linked in: 8021q garp stp snd_seq_dummy tun fuse rfcomm hidp sctp bnep can_raw scsi_transport_iscsi nfc caif_socket caif af_802154 phonet af_rxrpc bluetooth can_bcm can llc2 pppoe pppox ppp_generic slhc nfnetlink irda ipt_ULOG crc_ccitt rds af_key rose x25 atm netrom appletalk ipx p8023 psnap p8022 llc ax25 cfg80211 rfkill coretemp hwmon x86_pkg_temp_thermal kvm_intel kvm xfs snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep libcrc32c snd_seq e1000e snd_seq_device crct10dif_pclmul crc32c_intel ghash_clmulni_intel snd_pcm ptp snd_page_alloc shpchp snd_timer snd microcode serio_raw soundcore usb_debug pcspkr pps_core CPU: 1 PID: 13500 Comm: trinity-c5 Not tainted 3.13.0-rc7+ #14 ffffffff81a240ac ffff88002e0c7df8 ffffffff816de2ee 0000000000000000 ffff88002e0c7e30 ffffffff81052ddd ffff88024d0975f8 ffff880214d7bb10 0000000000000282 ffff88015b3b24c0 ffff880214d7bb10 ffff88002e0c7e40 Call Trace: [] dump_stack+0x4e/0x7a [] warn_slowpath_common+0x7d/0xa0 [] warn_slowpath_null+0x1a/0x20 [] task_ctx_sched_out+0x6b/0x80 [] perf_event_comm+0x108/0x260 [] ? perf_event_fork+0x20/0x20 [] ? set_task_comm+0x25/0xc0 [] set_task_comm+0x4f/0xc0 [] SyS_prctl+0x229/0x3d0 [] tracesys+0xdd/0xe2 ---[ end trace d6e98e080907af47 ]--- 2379 if (WARN_ON_ONCE(ctx != cpuctx->task_ctx)) 2380 return; -- 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/