Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755052AbaFUJvI (ORCPT ); Sat, 21 Jun 2014 05:51:08 -0400 Received: from mailrelay001.isp.belgacom.be ([195.238.6.51]:39594 "EHLO mailrelay001.isp.belgacom.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754753AbaFUJvG (ORCPT ); Sat, 21 Jun 2014 05:51:06 -0400 X-Belgacom-Dynamic: yes X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AswQAFBVpVNXQwKa/2dsb2JhbABYgw2DSKgFAQEBAQEBBQGZJgICAYEIF3WEAwEBBAE6HCMFCwgDRiEYHgYTiC4DCQwBwlcNhksXhWKGcYIjB4RDAQOYS4F4AY1YhgKDRDs Date: Sat, 21 Jun 2014 11:51:19 +0200 From: Fabian Frederick To: Damien Wyart Cc: Jens Axboe , "linux-kernel@vger.kernel.org" Subject: Re: BUG when trying to use deadline iosched in 3.16-rc1 Message-Id: <20140621115119.8d303c1ada5685c8eb9a1c27@skynet.be> In-Reply-To: References: X-Mailer: Sylpheed 3.3.0 (GTK+ 2.24.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 21 Jun 2014 11:37:47 +0200 Damien Wyart wrote: > 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. It seems you're right. I didn't know that parameter could be updated dynamically. In that case, adding __init to elv_register was a bad idea because it's no more reliable. Could you revert that patch Jens ? Thanks, Fabian > > 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/