Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934426AbaFUJhu (ORCPT ); Sat, 21 Jun 2014 05:37:50 -0400 Received: from mail-ig0-f171.google.com ([209.85.213.171]:37035 "EHLO mail-ig0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754922AbaFUJhs (ORCPT ); Sat, 21 Jun 2014 05:37:48 -0400 MIME-Version: 1.0 Date: Sat, 21 Jun 2014 11:37:47 +0200 Message-ID: Subject: BUG when trying to use deadline iosched in 3.16-rc1 From: Damien Wyart To: Jens Axboe , Fabian Frederick Cc: "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, While testing 3.16-rc1, I got this error: Jun 21 11:19:03 brouette kernel: kernel tried to execute NX-protected page - exploit attempt? (uid: 0) Jun 21 11:19:03 brouette kernel: BUG: unable to handle kernel paging request at ffffffff8171a1f8 Jun 21 11:19:03 brouette kernel: IP: [] elv_register+0x0/0x197 Jun 21 11:19:03 brouette kernel: PGD 163d067 PUD 163e063 PMD 1b887f063 PTE 800000000171a163 Jun 21 11:19:03 brouette kernel: Oops: 0011 [#1] PREEMPT SMP Jun 21 11:19:03 brouette kernel: Modules linked in: deadline_iosched(+) binfmt_misc hid_roccat_konepure hid_roccat hid_roccat_common hid_generic snd_usb_audio snd_usbmidi_lib usbhid snd_hwdep snd_hda_codec_realtek snd_hda_codec_generic nouveau wmi snd_ca0106 video snd_ac97_codec i2c_algo_bit ttm snd_seq_dummy ac97_bus snd_seq_midi drm_kms_helper snd_seq_oss drm snd_seq_midi_event i2c_core snd_seq pcspkr sr_mod backlight snd_hda_intel snd_rawmidi snd_hda_controller cdrom snd_hda_codec snd_seq_device snd_pcm_oss snd_mixer_oss uhci_hcd ehci_pci snd_pcm ehci_hcd nvidiafb snd_timer usbcore vgastate usb_common evdev acpi_cpufreq loop fuse autofs4 Jun 21 11:19:03 brouette kernel: CPU: 1 PID: 2410 Comm: modprobe Tainted: P O 3.16.0-rc1 #1 Jun 21 11:19:03 brouette kernel: Hardware name: System manufacturer System Product Name/P6T SE, BIOS 0808 03/08/2010 Jun 21 11:19:03 brouette kernel: task: ffff8801b7c25b00 ti: ffff8801b4224000 task.ti: ffff8801b4224000 Jun 21 11:19:03 brouette kernel: RIP: 0010:[] [] elv_register+0x0/0x197 Jun 21 11:19:03 brouette kernel: RSP: 0018:ffff8801b4227d60 EFLAGS: 00010246 Jun 21 11:19:03 brouette kernel: RAX: ffff8801b55a2101 RBX: ffffffff81641040 RCX: 0000000003be0001 Jun 21 11:19:03 brouette kernel: RDX: 0000000003bde001 RSI: ffffffff815a9f0d RDI: ffffffffa103b880 Jun 21 11:19:03 brouette kernel: RBP: ffff8801b4227d68 R08: 00000000000148e0 R09: 000000000000ffff Jun 21 11:19:03 brouette kernel: R10: 0000000000000012 R11: 0000000000011c00 R12: ffff8801b55a2980 Jun 21 11:19:03 brouette kernel: R13: 0000000000000000 R14: ffffffffa103d000 R15: ffffffffa103ba40 Jun 21 11:19:03 brouette kernel: FS: 00007f50c9669700(0000) GS:ffff8801bfc20000(0000) knlGS:0000000000000000 Jun 21 11:19:03 brouette kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Jun 21 11:19:03 brouette kernel: CR2: ffffffff8171a1f8 CR3: 00000001b7b1c000 CR4: 00000000000007e0 Jun 21 11:19:03 brouette kernel: Stack: Jun 21 11:19:03 brouette kernel: ffffffffa103d010 ffff8801b4227dd8 ffffffff810002c4 0000000000000001 Jun 21 11:19:03 brouette kernel: 0000000000000001 ffffffffa103ba40 ffff8801b4227db8 ffffffff810ed74a Jun 21 11:19:03 brouette kernel: ffff8801b4227ef8 ffffffffa103ba58 ffffffffa103ba90 ffff8801b4227ef8 Jun 21 11:19:03 brouette kernel: Call Trace: Jun 21 11:19:03 brouette kernel: [] ? deadline_init+0x10/0x12 [deadline_iosched] Jun 21 11:19:03 brouette kernel: [] do_one_initcall+0x84/0x1c0 Jun 21 11:19:03 brouette kernel: [] ? __vunmap+0x9a/0x100 Jun 21 11:19:03 brouette kernel: [] load_module+0x19bc/0x2160 Jun 21 11:19:03 brouette kernel: [] ? symbol_put_addr+0x40/0x40 Jun 21 11:19:03 brouette kernel: [] SyS_finit_module+0x76/0x80 Jun 21 11:19:03 brouette kernel: [] system_call_fastpath+0x16/0x1b Jun 21 11:19:03 brouette kernel: Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Jun 21 11:19:03 brouette kernel: RIP [] elv_register+0x0/0x197 Jun 21 11:19:03 brouette kernel: RSP Jun 21 11:19:03 brouette kernel: CR2: ffffffff8171a1f8 Jun 21 11:19:03 brouette kernel: ---[ end trace 5bbf40f5ac5f66e3 ]--- Jun 21 11:19:03 brouette kernel: elevator: type deadline not found Jun 21 11:19:03 brouette kernel: elevator: switch to deadline My startup scripts do this: echo "noop" > /sys/block/sda/queue/scheduler echo "deadline" > /sys/block/sdb/queue/scheduler echo "noop" > /sys/block/sdc/queue/scheduler echo "deadline" > /sys/block/sdd/queue/scheduler And the relevant part of my .config: CONFIG_IOSCHED_NOOP=y CONFIG_IOSCHED_DEADLINE=m CONFIG_IOSCHED_CFQ=y CONFIG_CFQ_GROUP_IOSCHED=y CONFIG_DEFAULT_IOSCHED="cfq" Maybe related to b5097e956a ? No problem with 3.15. Thanks, -- Damien Wyart -- 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/