Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753692AbbH3SEa (ORCPT ); Sun, 30 Aug 2015 14:04:30 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50546 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753632AbbH3SE2 (ORCPT ); Sun, 30 Aug 2015 14:04:28 -0400 Date: Sun, 30 Aug 2015 19:04:25 +0100 From: "Richard W.M. Jones" To: Josh Boyer Cc: Tejun Heo , Jeff Moyer , msnitzer@redhat.com, Li Zefan , Johannes Weiner , cgroups@vger.kernel.org, "Linux-Kernel@Vger. Kernel. Org" Subject: Re: __blkg_lookup oops with 4.2-rcX Message-ID: <20150830180425.GQ29283@redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-12-10) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5616 Lines: 108 On Sun, Aug 30, 2015 at 08:30:41AM -0400, Josh Boyer wrote: > Hi Tejun, > > Mike and Jeff suggested you be informed of the oops one of our > community members is hitting in Fedora with 4.2-rcX. I thought they > had already sent this upstream to you, but apparently they didn't. > > The latest oops is below. That is with 4.2-rc8. I believe the first > report was against a merge window 4.2 kernel. The full bug report is > here: https://bugzilla.redhat.com/show_bug.cgi?id=1237136 > > I believe Mike and Jeff suspected the cgroup writeback patches. Thanks Josh. Also, I can test potential patches if you CC me on them. Rich. > josh > > lvm vgchange -a n > /run/lvm/lvmetad.socket: connect failed: No such file or directory > WARNING: Failed to connect to lvmetad. Falling back to internal scanning. > [ 36.157672] BUG: unable to handle kernel NULL pointer dereference > at 0000000000000558 > [ 36.157672] IP: [] __blkg_lookup+0x26/0x70 > [ 36.157672] PGD 0 > [ 36.157672] Oops: 0000 [#1] SMP > [ 36.157672] Modules linked in: kvm_amd kvm snd_pcsp snd_pcm > snd_timer snd soundcore serio_raw ata_generic pata_acpi libcrc32c crc8 > crc_itu_t crc_ccitt virtio_pci virtio_mmio virtio_input virtio_balloon > virtio_scsi sym53c8xx scsi_transport_spi megaraid_sas megaraid_mbox > megaraid_mm megaraid ideapad_laptop rfkill sparse_keymap video > virtio_net virtio_gpu ttm drm_kms_helper drm virtio_console virtio_rng > virtio_blk virtio_ring virtio crc32 > [ 36.157672] CPU: 0 PID: 248 Comm: lvm Not tainted > 4.2.0-0.rc8.git0.1.fc23.x86_64 #1 > [ 36.157672] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), > BIOS 1.8.2-20150714_191134- 04/01/2014 > [ 36.157672] task: ffff88001b4e2580 ti: ffff88001ac0c000 task.ti: > ffff88001ac0c000 > [ 36.157672] RIP: 0010:[] [] > __blkg_lookup+0x26/0x70 > [ 36.157672] RSP: 0018:ffff88001ac0fa58 EFLAGS: 00000046 > [ 36.157672] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > [ 36.157672] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff820176a0 > [ 36.157672] RBP: ffff88001ac0fa78 R08: ffff88001ac0c000 R09: ffff88001ce6e800 > [ 36.157672] R10: 0000000000000002 R11: 000000000001eaa5 R12: ffff88001cc57000 > [ 36.157672] R13: ffff88001ccf99c8 R14: ffff88001ccf9f38 R15: ffff88001ccba8d8 > [ 36.157672] FS: 00007f9a21711880(0000) GS:ffff88001f000000(0000) > knlGS:0000000000000000 > [ 36.157672] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 36.157672] CR2: 0000000000000558 CR3: 000000001b41d000 CR4: 00000000000006f0 > [ 36.157672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 36.157672] DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000 > [ 36.157672] Stack: > [ 36.157672] ffffffff82017700 ffffffff820176a0 ffff88001cc57000 > ffff88001ccf99c8 > [ 36.157672] ffff88001ac0faa8 ffffffff8138d14a ffff88001cc570b8 > ffff88001ccf99c8 > [ 36.157672] ffffffff81cb1c20 0000000000000000 ffff88001ac0fab8 > ffffffff8138a108 > [ 36.157672] Call Trace: > [ 36.157672] [] blk_throtl_drain+0x5a/0x110 > [ 36.157672] [] blkcg_drain_queue+0x18/0x20 > [ 36.157672] [] __blk_drain_queue+0xc0/0x170 > [ 36.157672] [] blk_queue_bypass_start+0x61/0x80 > [ 36.157672] [] blkcg_deactivate_policy+0x39/0x100 > [ 36.157672] [] blk_throtl_exit+0x38/0x50 > [ 36.157672] [] blkcg_exit_queue+0x3e/0x50 > [ 36.157672] [] blk_release_queue+0x1e/0xc0 > [ 36.157672] [] kobject_release+0x7a/0x190 > [ 36.157672] [] kobject_put+0x2f/0x60 > [ 36.157672] [] blk_cleanup_queue+0x111/0x140 > [ 36.157672] [] cleanup_mapped_device+0xdc/0x100 > [ 36.157672] [] __dm_destroy+0x161/0x260 > [ 36.157672] [] dm_destroy+0x13/0x20 > [ 36.157672] [] dev_remove+0x10d/0x170 > [ 36.157672] [] ? dev_suspend+0x280/0x280 > [ 36.157672] [] ctl_ioctl+0x232/0x4d0 > [ 36.157672] [] ? SYSC_semtimedop+0x2b0/0xeb0 > [ 36.157672] [] ? __switch_to+0x261/0x4b0 > [ 36.157672] [] dm_ctl_ioctl+0x13/0x20 > [ 36.157672] [] do_vfs_ioctl+0x295/0x470 > [ 36.157672] [] ? sem_security+0x9/0x10 > [ 36.157672] [] SyS_ioctl+0x79/0x90 > [ 36.157672] [] entry_SYSCALL_64_fastpath+0x12/0x71 > [ 36.157672] Code: eb bf 0f 1f 00 66 66 66 66 90 55 48 89 e5 41 55 > 41 54 53 48 83 ec 08 48 8b 87 c8 00 00 00 48 85 c0 74 05 48 39 30 74 > 45 48 89 f3 <48> 63 b6 58 05 00 00 49 89 fd 48 8d bf b8 00 00 00 41 89 > d4 e8 > [ 36.157672] RIP [] __blkg_lookup+0x26/0x70 > [ 36.157672] RSP > [ 36.157672] CR2: 0000000000000558 > [ 36.157672] ---[ end trace a6310b2924d6c01e ]--- -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org -- 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/