← Back to team overview

kernel-packages team mailing list archive

[Bug 1564950] Re: Kernel panic when using CEPHFS (Hammer) /w kernel vivid-lts on Ubuntu 14.04

 

This bug was fixed in the package linux-lts-utopic -
3.16.0-71.91~14.04.1

---------------
linux-lts-utopic (3.16.0-71.91~14.04.1) trusty; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1571796

  [ Kamal Mostafa ]

  * [debian] BugLink: close LP: bugs only for Launchpad urls

  [ Upstream Kernel Changes ]

  * Revert "jffs2: Fix lock acquisition order bug in jffs2_write_begin"
    - LP: #1563345
  * iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG
    - LP: #1563345
  * drm/i915/dsi: defend gpio table against out of bounds access
    - LP: #1563345
  * drm/i915/dsi: don't pass arbitrary data to sideband
    - LP: #1563345
  * powerpc: Fix dedotify for binutils >= 2.26
    - LP: #1563345
  * drm/i915: fix error path in intel_setup_gmbus()
    - LP: #1563345
  * cifs: fix erroneous return value
    - LP: #1563345
  * s390/dasd: prevent incorrect length error under z/VM after PAV changes
    - LP: #1563345
  * s390/dasd: fix refcount for PAV reassignment
    - LP: #1563345
  * scsi: fix soft lockup in scsi_remove_target() on module removal
    - LP: #1563345
  * ext4: fix potential integer overflow
    - LP: #1563345
  * ext4: don't read blocks from disk after extents being swapped
    - LP: #1563345
  * bio: return EINTR if copying to user space got interrupted
    - LP: #1563345
  * ALSA: seq: Drop superfluous error/debug messages after malloc failures
    - LP: #1563345
  * ALSA: seq: Fix leak of pool buffer at concurrent writes
    - LP: #1563345
  * dmaengine: dw: disable BLOCK IRQs for non-cyclic xfer
    - LP: #1563345
  * tracepoints: Do not trace when cpu is offline
    - LP: #1563345
  * tracing: Fix freak link error caused by branch tracer
    - LP: #1563345
  * ALSA: seq: Fix double port list deletion
    - LP: #1563345
  * drm/radeon: use post-decrement in error handling
    - LP: #1563345
  * drm/qxl: use kmalloc_array to alloc reloc_info in
    qxl_process_single_command
    - LP: #1563345
  * ext4: fix bh->b_state corruption
    - LP: #1563345
  * ext4: fix crashes in dioread_nolock mode
    - LP: #1563345
  * kernel/resource.c: fix muxed resource handling in __request_region()
    - LP: #1563345
  * x86/entry/compat: Add missing CLAC to entry_INT80_32
    - LP: #1563345
  * crypto: {blk,giv}cipher: Set has_setkey
    - LP: #1563345
  * nfs: fix nfs_size_to_loff_t
    - LP: #1563345
  * xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY
    - LP: #1563345
  * xen/pciback: Save the number of MSI-X entries to be copied later.
    - LP: #1563345
  * xen/pcifront: Fix mysterious crashes when NUMA locality information was
    extracted.
    - LP: #1563345
  * usb: dwc3: Fix assignment of EP transfer resources
    - LP: #1563345
  * NFSv4: Fix a dentry leak on alias use
    - LP: #1563345
  * USB: option: add support for SIM7100E
    - LP: #1563345
  * USB: cp210x: add IDs for GE B650V3 and B850V3 boards
    - LP: #1563345
  * USB: option: add "4G LTE usb-modem U901"
    - LP: #1563345
  * hwmon: (ads1015) Handle negative conversion values correctly
    - LP: #1563345
  * drivers: android: correct the size of struct binder_uintptr_t for
    BC_DEAD_BINDER_DONE
    - LP: #1563345
  * can: ems_usb: Fix possible tx overflow
    - LP: #1563345
  * sunrpc/cache: fix off-by-one in qword_get()
    - LP: #1563345
  * KVM: async_pf: do not warn on page allocation failures
    - LP: #1563345
  * tracing: Fix showing function event in available_events
    - LP: #1563345
  * libceph: don't bail early from try_read() when skipping a message
    - LP: #1563345
  * ALSA: hda - Fixing background noise on Dell Inspiron 3162
    - LP: #1549620, #1563345
  * KVM: x86: MMU: fix ubsan index-out-of-range warning
    - LP: #1563345
  * ALSA: hda - Fix headset support and noise on HP EliteBook 755 G2
    - LP: #1563345
  * hpfs: don't truncate the file when delete fails
    - LP: #1563345
  * do_last(): don't let a bogus return value from ->open() et.al. to
    confuse us
    - LP: #1563345
  * ARM: dts: kirkwood: use unique machine name for ds112
    - LP: #1563345
  * bonding: Fix ARP monitor validation
    - LP: #1563345
  * af_unix: Don't set err in unix_stream_read_generic unless there was an
    error
    - LP: #1563345
  * af_unix: Guard against other == sk in unix_dgram_sendmsg
    - LP: #1563345
  * net: phy: bcm7xxx: Fix shadow mode 2 disabling
    - LP: #1563345
  * net/mlx4_en: Count HW buffer overrun only once
    - LP: #1563345
  * net/mlx4_en: Choose time-stamping shift value according to HW frequency
    - LP: #1563345
  * net/mlx4_en: Avoid changing dev->features directly in run-time
    - LP: #1563345
  * unix_diag: fix incorrect sign extension in unix_lookup_by_ino
    - LP: #1563345
  * af_iucv: Validate socket address length in iucv_sock_bind()
    - LP: #1563345
  * net: dp83640: Fix tx timestamp overflow handling.
    - LP: #1563345
  * tcp: fix NULL deref in tcp_v4_send_ack()
    - LP: #1563345
  * ipv6/udp: use sticky pktinfo egress ifindex on connect()
    - LP: #1563345
  * net/ipv6: add sysctl option accept_ra_min_hop_limit
    - LP: #1563345
  * net:Add sysctl_max_skb_frags
    - LP: #1563345
  * tg3: Fix for tg3 transmit queue 0 timed out when too many gso_segs
    - LP: #1563345
  * ipv4: fix memory leaks in ip_cmsg_send() callers
    - LP: #1563345
  * qmi_wwan: add "4G LTE usb-modem U901"
    - LP: #1563345
  * pppoe: fix reference counting in PPPoE proxy
    - LP: #1563345
  * route: check and remove route cache when we get route
    - LP: #1563345
  * rtnl: RTM_GETNETCONF: fix wrong return value
    - LP: #1563345
  * sctp: Fix port hash table size computation
    - LP: #1563345
  * target: Fix LUN_RESET active TMR descriptor handling
    - LP: #1563345
  * target: Fix LUN_RESET active I/O handling for ACK_KREF
    - LP: #1563345
  * target: Fix TAS handling for multi-session se_node_acls
    - LP: #1563345
  * target: Fix remote-port TMR ABORT + se_cmd fabric stop
    - LP: #1563345
  * target: Fix race with SCF_SEND_DELAYED_TAS handling
    - LP: #1563345
  * libata: fix HDIO_GET_32BIT ioctl
    - LP: #1563345
  * [media] adv7604: fix tx 5v detect regression
    - LP: #1563345
  * usb: chipidea: otg: change workqueue ci_otg as freezable
    - LP: #1563345
  * jffs2: Fix page lock / f->sem deadlock
    - LP: #1563345
  * Fix directory hardlinks from deleted directories
    - LP: #1563345
  * iommu/amd: Fix boot warning when device 00:00.0 is not iommu covered
    - LP: #1563345
  * libata: Align ata_device's id on a cacheline
    - LP: #1563345
  * vfio: fix ioctl error handling
    - LP: #1563345
  * ALSA: ctl: Fix ioctls for X32 ABI
    - LP: #1563345
  * ALSA: rawmidi: Fix ioctls X32 ABI
    - LP: #1563345
  * ALSA: timer: Fix broken compat timer user status ioctl
    - LP: #1563345
  * ALSA: timer: Fix ioctls for X32 ABI
    - LP: #1563345
  * cifs: fix out-of-bounds access in lease parsing
    - LP: #1563345
  * CIFS: Fix SMB2+ interim response processing for read requests
    - LP: #1563345
  * Fix cifs_uniqueid_to_ino_t() function for s390x
    - LP: #1563345
  * arm/arm64: KVM: Fix ioctl error handling
    - LP: #1563345
  * ALSA: hdspm: Fix wrong boolean ctl value accesses
    - LP: #1563345
  * ALSA: hdspm: Fix zero-division
    - LP: #1563345
  * ALSA: hdsp: Fix wrong boolean ctl value accesses
    - LP: #1563345
  * USB: qcserial: add Dell Wireless 5809e Gobi 4G HSPA+ (rev3)
    - LP: #1563345
  * USB: cp210x: Add ID for Parrot NMEA GPS Flight Recorder
    - LP: #1563345
  * USB: serial: option: add support for Telit LE922 PID 0x1045
    - LP: #1563345
  * USB: serial: option: add support for Quectel UC20
    - LP: #1563345
  * ALSA: seq: oss: Don't drain at closing a client
    - LP: #1563345
  * drm/ast: Fix incorrect register check for DRAM width
    - LP: #1563345
  * USB: qcserial: add Sierra Wireless EM74xx device ID
    - LP: #1563345
  * drm/radeon/pm: update current crtc info after setting the powerstate
    - LP: #1563345
  * PM / sleep / x86: Fix crash on graph trace through x86 suspend
    - LP: #1563345
  * ALSA: hda - Fix mic issues on Acer Aspire E1-472
    - LP: #1563345
  * MIPS: traps: Fix SIGFPE information leak from `do_ov' and
    `do_trap_or_bp'
    - LP: #1563345
  * ubi: Fix out of bounds write in volume update code
    - LP: #1563345
  * gpio: rcar: Add Runtime PM handling for interrupts
    - LP: #1563345
  * IB/core: Use GRH when the path hop-limit > 0
    - LP: #1563345
  * wext: fix message delay/ordering
    - LP: #1563345
  * cfg80211/wext: fix message ordering
    - LP: #1563345
  * mac80211: fix use of uninitialised values in RX aggregation
    - LP: #1563345
  * mac80211: minstrel_ht: set default tx aggregation timeout to 0
    - LP: #1563345
  * can: gs_usb: fixed disconnect bug by removing erroneous use of kfree()
    - LP: #1563345
  * ASoC: wm8958: Fix enum ctl accesses in a wrong type
    - LP: #1563345
  * ASoC: wm8994: Fix enum ctl accesses in a wrong type
    - LP: #1563345
  * ASoC: wm_adsp: Fix enum ctl accesses in a wrong type
    - LP: #1563345
  * target: Drop incorrect ABORT_TASK put for completed commands
    - LP: #1563345
  * KVM: PPC: Book3S HV: Sanitize special-purpose register values on guest
    exit
    - LP: #1563345
  * KVM: VMX: disable PEBS before a guest entry
    - LP: #1563345
  * tcp: convert cached rtt from usec to jiffies when feeding initial rto
    - LP: #1563345
  * net/mlx4_core: Allow resetting VF admin mac to zero
    - LP: #1563345
  * mld, igmp: Fix reserved tailroom calculation
    - LP: #1563345
  * ipv6: re-enable fragment header matching in ipv6_find_hdr
    - LP: #1563345
  * net: moxa: fix an error code
    - LP: #1563345
  * cdc_ncm: do not call usbnet_link_change from cdc_ncm_bind
    - LP: #1563345
  * ext4: iterate over buffer heads correctly in move_extent_per_page()
    - LP: #1563345
  * Input: aiptek - fix crash on detecting device without endpoints
    - LP: #1563345
  * AIO: properly check iovec sizes
    - LP: #1563345
  * bcache: add mutex lock for bch_is_open
    - LP: #1563345
  * KVM: x86: move steal time initialization to vcpu entry time
    - LP: #1563345
  * lib/ucs2_string: Add ucs2 -> utf8 helper functions
    - LP: #1563345
  * efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version
    - LP: #1563345
  * efi: Do variable name validation tests in utf8
    - LP: #1563345
  * efi: Make our variable validation list include the guid
    - LP: #1563345
  * efi: Make efivarfs entries immutable by default
    - LP: #1563345
  * efi: Add pstore variables to the deletion whitelist
    - LP: #1563345
  * lib/ucs2_string: Correct ucs2 -> utf8 conversion
    - LP: #1563345
  * tracing: Fix check for cpu online when event is disabled
    - LP: #1563345
  * Linux 3.16.7-ckt26
    - LP: #1563345
  * ceph: fix request time stamp encoding
    - LP: #1564950
  * ipv4: Don't do expensive useless work during inetdev destroy.
    - LP: #1570872
  * Input: powermate - fix oops with malicious USB descriptors
    - LP: #1570872
  * USB: iowarrior: fix oops with malicious USB descriptors
    - LP: #1570872
  * ALSA: usb-audio: Fix NULL dereference in create_fixed_stream_quirk()
    - LP: #1570872
  * ALSA: usb-audio: Add sanity checks for endpoint accesses
    - LP: #1570872
  * include/linux/poison.h: fix LIST_POISON{1,2} offset
    - LP: #1570872
  * cpu: Defer smpboot kthread unparking until CPU known to scheduler
    - LP: #1570872
  * ipr: Fix out-of-bounds null overwrite
    - LP: #1570872
  * ipr: Fix regression when loading firmware
    - LP: #1570872
  * Input: ati_remote2 - fix crashes on detecting device with invalid
    descriptor
    - LP: #1570872
  * USB: cdc-acm: more sanity checking
    - LP: #1570872
  * cpu: Provide smpboot_thread_init() on !CONFIG_SMP kernels as well
    - LP: #1570872
  * x86/iopl/64: Properly context-switch IOPL on Xen PV
    - LP: #1570872
  * staging: comedi: ni_tiocmd: change mistaken use of start_src for
    start_arg
    - LP: #1570872
  * drm/radeon: hold reference to fences in radeon_sa_bo_new (3.17 and
    older)
    - LP: #1570872
  * Drivers: hv: vmbus: prevent cpu offlining on newer hypervisors
    - LP: #1570872
  * Linux 3.16.7-ckt27
    - LP: #1570872

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Mon, 18 Apr 2016 11:51:24 -0700

** Changed in: linux-lts-vivid (Ubuntu Trusty)
       Status: New => Fix Released

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-lts-utopic in Ubuntu.
https://bugs.launchpad.net/bugs/1564950

Title:
  Kernel panic when using CEPHFS (Hammer) /w kernel vivid-lts on Ubuntu
  14.04

Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-utopic package in Ubuntu:
  New
Status in linux-lts-vivid package in Ubuntu:
  New
Status in linux-lts-utopic source package in Trusty:
  Fix Released
Status in linux-lts-vivid source package in Trusty:
  Fix Released
Status in linux source package in Vivid:
  Fix Released

Bug description:
  Reported by Dennis Kramer at http://tracker.ceph.com/issues/15302

  ----------

  Nowadays i'm getting a kernel panic when i use the vivid-lts (3.19.x)
  kernel on ubuntu 14.04 after I try to mount cephfs. Log indicates:

  kernel BUG at /build/linux-lts-vivid-ZTSmDy/linux-lts-vivid-3.19.0/fs/ceph/mds_client.c:1928[ 27.305173] kernel BUG at /build/linux-lts-vivid-ZTSmDy/linux-lts-vivid-3.19.0/fs/ceph/mds_client.c:1928!
  [ 27.307226] invalid opcode: 0000 [#1] SMP 
  [ 27.307599] Modules linked in: ceph libceph libcrc32c fscache ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt ppdev parport_pc 8250_fintek pvpanic serio_raw joydev parport i2c_piix4 mac_hid hid_generic usbhid hid syscopyarea sysfillrect sysimgblt ttm drm_kms_helper psmouse drm pata_acpi floppy
  [ 27.307599] CPU: 0 PID: 118 Comm: kworker/0:2 Not tainted 3.19.0-56-generic #62~14.04.1-Ubuntu
  [ 27.307599] Hardware name: OpenStack Foundation OpenStack Nova, BIOS 1.7.5-20150310_111955-batsu 04/01/2014
  [ 27.307599] Workqueue: ceph-msgr con_work [libceph]
  [ 27.307599] task: ffff88007ca0ce80 ti: ffff88003657c000 task.ti: ffff88003657c000
  [ 27.307599] RIP: 0010:[<ffffffffc02e3ed0>] [<ffffffffc02e3ed0>] __prepare_send_request+0x7d0/0x800 [ceph]
  [ 27.307599] RSP: 0018:ffff88003657fb48 EFLAGS: 00010283
  [ 27.307599] RAX: ffff880077e1bb02 RBX: ffff8800364af000 RCX: 0000000000000000
  [ 27.307599] RDX: 0000000038a516d3 RSI: 0000000000000000 RDI: ffff880077e1baf2
  [ 27.307599] RBP: ffff88003657fbe8 R08: 0000000000000000 R09: 0000000000000000
  [ 27.307599] R10: ffffffffc0275fe6 R11: 0000000000000000 R12: ffff88007873c700
  [ 27.307599] R13: ffff880078458000 R14: 0000000000000000 R15: ffff880077e1ba80
  [ 27.307599] FS: 0000000000000000(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
  [ 27.307599] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [ 27.307599] CR2: 00007ff6e2973000 CR3: 0000000036387000 CR4: 00000000000006f0
  [ 27.307599] Stack:
  [ 27.307599] ffff88003657fb8c ffffffffc02e1109 0100000000000015 0000000000000001
  [ 27.307599] ffff8800362e0118 ffff880077e1bafa ffff88003657fbe8 0000000000000000
  [ 27.307599] 0000000000000000 ffff8800362e0118 0000000000000000 0000000000000001
  [ 27.307599] Call Trace:
  [ 27.307599] [<ffffffffc02e1109>] ? __choose_mds+0x119/0x470 [ceph]
  [ 27.307599] [<ffffffffc02e4130>] __do_request+0x230/0x310 [ceph]
  [ 27.307599] [<ffffffffc02e4288>] __wake_requests+0x78/0xb0 [ceph]
  [ 27.307599] [<ffffffffc02e7430>] dispatch+0x550/0xad0 [ceph]
  [ 27.307599] [<ffffffffc027abbb>] try_read+0x4cb/0x10f0 [libceph]
  [ 27.307599] [<ffffffff810ab41e>] ? dequeue_task_fair+0x44e/0x660
  [ 27.307599] [<ffffffff810ac171>] ? put_prev_entity+0x31/0x3f0
  [ 27.307599] [<ffffffff810a41c8>] ? sched_clock_cpu+0x98/0xc0
  [ 27.307599] [<ffffffffc027b899>] con_work+0xb9/0x620 [libceph]
  [ 27.307599] [<ffffffff8108dc8f>] process_one_work+0x14f/0x400
  [ 27.307599] [<ffffffff8108e428>] worker_thread+0x118/0x510
  [ 27.307599] [<ffffffff8108e310>] ? rescuer_thread+0x3d0/0x3d0
  [ 27.307599] [<ffffffff81093902>] kthread+0xd2/0xf0
  [ 27.307599] [<ffffffff81093830>] ? kthread_create_on_node+0x1c0/0x1c0
  [ 27.307599] [<ffffffff817b8b98>] ret_from_fork+0x58/0x90
  [ 27.307599] [<ffffffff81093830>] ? kthread_create_on_node+0x1c0/0x1c0
  [ 27.307599] Code: e9 27 f9 ff ff 44 89 a3 70 02 00 00 48 89 de 4c 89 ef 44 89 65 88 e8 a0 c3 ff ff 8b 45 88 e9 09 f9 ff ff 4c 63 e0 e9 d9 f9 ff ff <0f> 0b 49 8b 8f 98 fc ff ff 4d 8b 87 a0 fc ff ff 4c 89 fa 48 c7 
  [ 27.307599] RIP [<ffffffffc02e3ed0>] __prepare_send_request+0x7d0/0x800 [ceph]
  [ 27.307599] RSP <ffff88003657fb48>
  [ 27.379039] ---[ end trace 1928182fad693b4d ]---
  [ 27.379983] BUG: unable to handle kernel paging request at ffffffffffffffd8
  [ 27.381275] IP: [<ffffffff81094000>] kthread_data+0x10/0x20
  [ 27.382382] PGD 1c19067 PUD 1c1b067 PMD 0 
  [ 27.383004] Oops: 0000 [#2] SMP 
  [ 27.383004] Modules linked in: ceph libceph libcrc32c fscache ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_crypt ppdev parport_pc 8250_fintek pvpanic serio_raw joydev parport i2c_piix4 mac_hid hid_generic usbhid hid syscopyarea sysfillrect sysimgblt ttm drm_kms_helper psmouse drm pata_acpi floppy
  [ 27.383004] CPU: 0 PID: 118 Comm: kworker/0:2 Tainted: G D 3.19.0-56-generic #62~14.04.1-Ubuntu
  [ 27.383004] Hardware name: OpenStack Foundation OpenStack Nova, BIOS 1.7.5-20150310_111955-batsu 04/01/2014
  [ 27.383004] task: ffff88007ca0ce80 ti: ffff88003657c000 task.ti: ffff88003657c000
  [ 27.383004] RIP: 0010:[<ffffffff81094000>] [<ffffffff81094000>] kthread_data+0x10/0x20
  [ 27.383004] RSP: 0018:ffff88003657f7c8 EFLAGS: 00010096
  [ 27.383004] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000000d
  [ 27.383004] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88007ca0ce80
  [ 27.383004] RBP: ffff88003657f7c8 R08: 0000000000000000 R09: 0000000000000246
  [ 27.383004] R10: ffffffff810721a4 R11: ffffea0001dfba00 R12: ffff88007ca0d3a0
  [ 27.383004] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88007ca0ce80
  [ 27.383004] FS: 0000000000000000(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
  [ 27.383004] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  [ 27.383004] CR2: 0000000000000028 CR3: 0000000036387000 CR4: 00000000000006f0
  [ 27.383004] Stack:
  [ 27.383004] ffff88003657f7e8 ffffffff8108ed05 ffff88003657f7e8 ffff88007fc13e80
  [ 27.383004] ffff88003657f858 ffffffff817b45fb ffff88007ca0ce80 0000000000013e80
  [ 27.383004] ffff88003657ffd8 0000000000013e80 0000000000000004 ffff88007ca0ce80
  [ 27.383004] Call Trace:
  [ 27.383004] [<ffffffff8108ed05>] wq_worker_sleeping+0x15/0xa0
  [ 27.383004] [<ffffffff817b45fb>] __schedule+0x5bb/0x820
  [ 27.383004] [<ffffffff817b4889>] schedule+0x29/0x70
  [ 27.383004] [<ffffffff810777ff>] do_exit+0x69f/0xb00
  [ 27.383004] [<ffffffff810187f8>] oops_end+0xa8/0x120
  [ 27.383004] [<ffffffff81018deb>] die+0x4b/0x70
  [ 27.383004] [<ffffffff810153a0>] do_trap+0xb0/0x150
  [ 27.383004] [<ffffffff81015a37>] do_error_trap+0x97/0x150
  [ 27.383004] [<ffffffffc02e3ed0>] ? __prepare_send_request+0x7d0/0x800 [ceph]
  [ 27.383004] [<ffffffff810160c0>] do_invalid_op+0x20/0x30
  [ 27.383004] [<ffffffff817ba7be>] invalid_op+0x1e/0x30
  [ 27.383004] [<ffffffffc0275fe6>] ? ceph_kvmalloc+0x26/0x50 [libceph]
  [ 27.383004] [<ffffffffc02e3ed0>] ? __prepare_send_request+0x7d0/0x800 [ceph]
  [ 27.383004] [<ffffffffc02e3a44>] ? __prepare_send_request+0x344/0x800 [ceph]
  [ 27.383004] [<ffffffffc02e1109>] ? __choose_mds+0x119/0x470 [ceph]
  [ 27.383004] [<ffffffffc02e4130>] __do_request+0x230/0x310 [ceph]
  [ 27.383004] [<ffffffffc02e4288>] __wake_requests+0x78/0xb0 [ceph]
  [ 27.383004] [<ffffffffc02e7430>] dispatch+0x550/0xad0 [ceph]
  [ 27.383004] [<ffffffffc027abbb>] try_read+0x4cb/0x10f0 [libceph]
  [ 27.383004] [<ffffffff810ab41e>] ? dequeue_task_fair+0x44e/0x660
  [ 27.383004] [<ffffffff810ac171>] ? put_prev_entity+0x31/0x3f0
  [ 27.383004] [<ffffffff810a41c8>] ? sched_clock_cpu+0x98/0xc0
  [ 27.383004] [<ffffffffc027b899>] con_work+0xb9/0x620 [libceph]
  [ 27.383004] [<ffffffff8108dc8f>] process_one_work+0x14f/0x400
  [ 27.383004] [<ffffffff8108e428>] worker_thread+0x118/0x510
  [ 27.383004] [<ffffffff8108e310>] ? rescuer_thread+0x3d0/0x3d0
  [ 27.383004] [<ffffffff81093902>] kthread+0xd2/0xf0
  [ 27.383004] [<ffffffff81093830>] ? kthread_create_on_node+0x1c0/0x1c0
  [ 27.383004] [<ffffffff817b8b98>] ret_from_fork+0x58/0x90
  [ 27.383004] [<ffffffff81093830>] ? kthread_create_on_node+0x1c0/0x1c0
  [ 27.383004] Code: 00 48 89 e5 5d 48 8b 40 c8 48 c1 e8 02 83 e0 01 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 87 c8 04 00 00 55 48 89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 
  [ 27.383004] RIP [<ffffffff81094000>] kthread_data+0x10/0x20
  [ 27.383004] RSP <ffff88003657f7c8>
  [ 27.383004] CR2: ffffffffffffffd8
  [ 27.383004] ---[ end trace 1928182fad693b4e ]---
  [ 27.383004] Fixing recursive fault but reboot is needed!

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1564950/+subscriptions


References