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[Launchpad Bug Tracker <1821259@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-48.51

---------------
linux (4.15.0-48.51) bionic; urgency=medium

  * linux: 4.15.0-48.51 -proposed tracker (LP: #1822820)

  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts
    - [Packaging] resync retpoline extraction

  * 3b080b2564287be91605bfd1d5ee985696e61d3c in ubuntu_btrfs_kernel_fixes
    triggers system hang on i386 (LP: #1812845)
    - btrfs: raid56: properly unmap parity page in finish_parity_scrub()

  * [P9][LTCTest][Opal][FW910] cpupower monitor shows multiple stop Idle_Stats
    (LP: #1719545)
    - cpupower : Fix header name to read idle state name

  * [amdgpu] screen corruption when using touchpad (LP: #1818617)
    - drm/amdgpu/gmc: steal the appropriate amount of vram for fw hand-over (v3)
    - drm/amdgpu: Free VGA stolen memory as soon as possible.

  * [SRU][B/C/OEM]IOMMU: add kernel dma protection (LP: #1820153)
    - ACPICA: AML parser: attempt to continue loading table after error
    - ACPI / property: Allow multiple property compatible _DSD entries
    - PCI / ACPI: Identify untrusted PCI devices
    - iommu/vt-d: Force IOMMU on for platform opt in hint
    - iommu/vt-d: Do not enable ATS for untrusted devices
    - thunderbolt: Export IOMMU based DMA protection support to userspace
    - iommu/vt-d: Disable ATS support on untrusted devices

  * Add basic support to NVLink2 passthrough (LP: #1819989)
    - powerpc/powernv/npu: Do not try invalidating 32bit table when 64bit table is
      enabled
    - powerpc/powernv: call OPAL_QUIESCE before OPAL_SIGNAL_SYSTEM_RESET
    - powerpc/powernv: Export opal_check_token symbol
    - powerpc/powernv: Make possible for user to force a full ipl cec reboot
    - powerpc/powernv/idoa: Remove unnecessary pcidev from pci_dn
    - powerpc/powernv: Move npu struct from pnv_phb to pci_controller
    - powerpc/powernv/npu: Move OPAL calls away from context manipulation
    - powerpc/pseries/iommu: Use memory@ nodes in max RAM address calculation
    - powerpc/pseries/npu: Enable platform support
    - powerpc/pseries: Remove IOMMU API support for non-LPAR systems
    - powerpc/powernv/npu: Check mmio_atsd array bounds when populating
    - powerpc/powernv/npu: Fault user page into the hypervisor's pagetable

  * Huawei Hi1822 NIC has poor performance (LP: #1820187)
    - net-next: hinic: fix a problem in free_tx_poll()
    - hinic: remove ndo_poll_controller
    - net-next/hinic: add checksum offload and TSO support
    - hinic: Fix l4_type parameter in hinic_task_set_tunnel_l4
    - net-next/hinic:replace multiply and division operators
    - net-next/hinic:add rx checksum offload for HiNIC
    - net-next/hinic:fix a bug in set mac address
    - net-next/hinic: fix a bug in rx data flow
    - net: hinic: fix null pointer dereference on pointer hwdev
    - hinic: optmize rx refill buffer mechanism
    - net-next/hinic:add shutdown callback
    - net-next/hinic: replace disable_irq_nosync/enable_irq

  * [CONFIG] please enable highdpi font FONT_TER16x32 (LP: #1819881)
    - Fonts: New Terminus large console font
    - [Config]: enable highdpi Terminus 16x32 font support

  * [19.04 FEAT] qeth: Enhanced link speed - kernel part (LP: #1814892)
    - s390/qeth: report 25Gbit link speed

  * CVE-2017-5754
    - x86/nmi: Fix NMI uaccess race against CR3 switching
    - x86/mm: Fix documentation of module mapping range with 4-level paging
    - x86/pti: Enable global pages for shared areas
    - x86/pti: Never implicitly clear _PAGE_GLOBAL for kernel image
    - x86/pti: Leave kernel text global for !PCID
    - x86/pti: Fix boot problems from Global-bit setting
    - x86/pti: Fix boot warning from Global-bit setting
    - x86/pti: Reduce amount of kernel text allowed to be Global
    - x86/pti: Disallow global kernel text with RANDSTRUCT
    - x86/entry/32: Add explicit 'l' instruction suffix
    - x86/asm-offsets: Move TSS_sp0 and TSS_sp1 to asm-offsets.c
    - x86/entry/32: Rename TSS_sysenter_sp0 to TSS_entry2task_stack
    - x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler
    - x86/entry/32: Put ESPFIX code into a macro
    - x86/entry/32: Unshare NMI return path
    - x86/entry/32: Split off return-to-kernel path
    - x86/entry/32: Enter the kernel via trampoline stack
    - x86/entry/32: Leave the kernel via trampoline stack
    - x86/entry/32: Introduce SAVE_ALL_NMI and RESTORE_ALL_NMI
    - x86/entry/32: Handle Entry from Kernel-Mode on Entry-Stack
    - x86/entry/32: Simplify debug entry point
    - x86/entry/32: Add PTI cr3 switch to non-NMI entry/exit points
    - x86/entry/32: Add PTI CR3 switches to NMI handler code
    - x86/entry: Rename update_sp0 to update_task_stack
    - x86/pgtable: Rename pti_set_user_pgd() to pti_set_user_pgtbl()
    - x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled
    - x86/pgtable/32: Allocate 8k page-tables when PTI is enabled
    - x86/pgtable: Move pgdp kernel/user conversion functions to pgtable.h
    - x86/pgtable: Move pti_set_user_pgtbl() to pgtable.h
    - x86/pgtable: Move two more functions from pgtable_64.h to pgtable.h
    - x86/mm/pae: Populate valid user PGD entries
    - x86/mm/pae: Populate the user page-table with user pgd's
    - x86/mm/pti: Add an overflow check to pti_clone_pmds()
    - x86/mm/pti: Define X86_CR3_PTI_PCID_USER_BIT on x86_32
    - x86/mm/pti: Clone CPU_ENTRY_AREA on PMD level on x86_32
    - x86/mm/pti: Make pti_clone_kernel_text() compile on 32 bit
    - x86/mm/pti: Keep permissions when cloning kernel text in
      pti_clone_kernel_text()
    - x86/mm/pti: Introduce pti_finalize()
    - x86/mm/pti: Clone entry-text again in pti_finalize()
    - x86/mm/dump_pagetables: Define INIT_PGD
    - x86/pgtable/pae: Use separate kernel PMDs for user page-table
    - x86/ldt: Reserve address-space range on 32 bit for the LDT
    - x86/ldt: Define LDT_END_ADDR
    - x86/ldt: Split out sanity check in map_ldt_struct()
    - x86/ldt: Enable LDT user-mapping for PAE
    - x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32
    - [Config] Update PAGE_TABLE_ISOLATION annotations
    - x86/mm/pti: Add Warning when booting on a PCID capable CPU
    - x86/entry/32: Add debug code to check entry/exit CR3
    - x86/pti: Check the return value of pti_user_pagetable_walk_p4d()
    - x86/pti: Check the return value of pti_user_pagetable_walk_pmd()
    - perf/core: Make sure the ring-buffer is mapped in all page-tables
    - x86/entry/32: Check for VM86 mode in slow-path check
    - x86/mm: Remove in_nmi() warning from vmalloc_fault()
    - x86/kexec: Allocate 8k PGDs for PTI
    - x86/mm/pti: Clear Global bit more aggressively
    - mm: Allow non-direct-map arguments to free_reserved_area()
    - x86/mm/init: Pass unconverted symbol addresses to free_init_pages()
    - x86/mm/init: Add helper for freeing kernel image pages
    - x86/mm/init: Remove freed kernel image areas from alias mapping
    - x86/mm/pti: Fix 32 bit PCID check
    - x86/mm/pti: Don't clear permissions in pti_clone_pmd()
    - x86/mm/pti: Clone kernel-image on PTE level for 32 bit
    - x86/relocs: Add __end_rodata_aligned to S_REL
    - x86/mm/pti: Move user W+X check into pti_finalize()
    - x86/efi: Load fixmap GDT in efi_call_phys_epilog()
    - x86/efi: Load fixmap GDT in efi_call_phys_epilog() before setting %cr3
    - x86/mm/doc: Clean up the x86-64 virtual memory layout descriptions
    - x86/mm/doc: Enhance the x86-64 virtual memory layout descriptions
    - x86/entry/32: Clear the CS high bits
    - x86/mm: Move LDT remap out of KASLR region on 5-level paging
    - x86/ldt: Unmap PTEs for the slot before freeing LDT pages
    - x86/ldt: Remove unused variable in map_ldt_struct()
    - x86/mm: Fix guard hole handling
    - x86/dump_pagetables: Fix LDT remap address marker

  * Avoid potential memory corruption on HiSilicon SoCs (LP: #1819546)
    - iommu/arm-smmu-v3: Avoid memory corruption from Hisilicon MSI payloads

  * Ubuntu18.04.01: [Power9] power8 Compat guest(RHEL7.6) crashes during guest
    boot with > 256G of memory (kernel/kvm) (LP: #1818645)
    - ]PATCH] KVM: PPC: Book3S HV: Don't truncate HPTE index in xlate function

  * Fix for dual Intel NVMes (LP: #1821961)
    - SAUCE: nvme: Merge two quirk entries into one for Intel 760p/Pro 7600p

  * CVE-2017-5715
    - tools headers: Synchronize prctl.h ABI header
    - x86/spectre: Add missing family 6 check to microcode check
    - x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation
    - x86/speculation: Apply IBPB more strictly to avoid cross-process data leak
    - x86/speculation: Propagate information about RSB filling mitigation to sysfs
    - x86/speculation: Add RETPOLINE_AMD support to the inline asm CALL_NOSPEC
      variant
    - x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support
    - x86/retpoline: Remove minimal retpoline support
    - x86/speculation: Update the TIF_SSBD comment
    - x86/speculation: Clean up spectre_v2_parse_cmdline()
    - x86/speculation: Remove unnecessary ret variable in cpu_show_common()
    - x86/speculation: Move STIPB/IBPB string conditionals out of
      cpu_show_common()
    - x86/speculation: Disable STIBP when enhanced IBRS is in use
    - x86/speculation: Rename SSBD update functions
    - x86/speculation: Reorganize speculation control MSRs update
    - sched/smt: Make sched_smt_present track topology
    - x86/Kconfig: Select SCHED_SMT if SMP enabled
    - sched/smt: Expose sched_smt_present static key
    - x86/speculation: Rework SMT state change
    - x86/l1tf: Show actual SMT state
    - x86/speculation: Reorder the spec_v2 code
    - x86/speculation: Mark string arrays const correctly
    - x86/speculataion: Mark command line parser data __initdata
    - x86/speculation: Unify conditional spectre v2 print functions
    - x86/speculation: Add command line control for indirect branch speculation
    - x86/speculation: Prepare for per task indirect branch speculation control
    - x86/process: Consolidate and simplify switch_to_xtra() code
    - x86/speculation: Avoid __switch_to_xtra() calls
    - x86/speculation: Prepare for conditional IBPB in switch_mm()
    - ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS
    - x86/speculation: Split out TIF update
    - x86/speculation: Prevent stale SPEC_CTRL msr content
    - x86/speculation: Prepare arch_smt_update() for PRCTL mode
    - x86/speculation: Add prctl() control for indirect branch speculation
    - x86/speculation: Enable prctl mode for spectre_v2_user
    - x86/speculation: Add seccomp Spectre v2 user space protection mode
    - x86/speculation: Provide IBPB always command line options
    - kvm: svm: Ensure an IBPB on all affected CPUs when freeing a vmcb
    - x86/speculation: Change misspelled STIPB to STIBP
    - x86/speculation: Add support for STIBP always-on preferred mode
    - x86, modpost: Replace last remnants of RETPOLINE with CONFIG_RETPOLINE
    - s390: remove closung punctuation from spectre messages
    - x86/speculation: Simplify the CPU bug detection logic

  * CVE-2018-3639
    - x86/bugs: Add AMD's variant of SSB_NO
    - x86/bugs: Add AMD's SPEC_CTRL MSR usage
    - x86/bugs: Switch the selection of mitigation from CPU vendor to CPU features
    - x86/bugs: Update when to check for the LS_CFG SSBD mitigation
    - x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR
    - KVM: x86: SVM: Call x86_spec_ctrl_set_guest/host() with interrupts disabled

  * [Ubuntu] vfio-ap: add subsystem to matrix device to avoid libudev failures
    (LP: #1818854)
    - s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem

  * Kernel regularly logs: Bluetooth: hci0: last event is not cmd complete
    (0x0f) (LP: #1748565)
    - Bluetooth: Fix unnecessary error message for HCI request completion

  * HiSilicon HNS ethernet broken in 4.15.0-45 (LP: #1818294)
    - net: hns: Fix WARNING when hns modules installed

  * rtl8723be wifi does not work under linux-modules-extra-4.15.0-33-generic
    (LP: #1788997)
    - SAUCE: Revert "rtlwifi: cleanup 8723be ant_sel definition"

  * Crash from :i915 module with 4.15.0-46-generic using multi-display
    (LP: #1819486)
    - SAUCE: Revert "drm/i915: Fix hotplug irq ack on i965/g4x"

  * kernel linux-image-4.15.0-44 not booting on Hyperv Server 2008R2
    (LP: #1814069)
    - hv/netvsc: fix handling of fallback to single queue mode
    - hv/netvsc: Fix NULL dereference at single queue mode fallback

  * Lenovo ideapad 330-15ICH Wifi rfkill hard blocked (LP: #1811815)
    - platform/x86: ideapad: Add ideapad 330-15ICH to no_hw_rfkill

  * Qualcomm Atheros QCA9377 wireless does not work (LP: #1818204)
    - platform/x86: ideapad-laptop: Add Ideapad 530S-14ARR to no_hw_rfkill list

  * fscache: jobs might hang when fscache disk is full (LP: #1821395)
    - fscache: fix race between enablement and dropping of object

  * hns3: fix oops in hns3_clean_rx_ring() (LP: #1821064)
    - net: hns3: add dma_rmb() for rx description

  * Hard lockup in 2 CPUs due to deadlock in cpu_stoppers (LP: #1821259)
    - stop_machine: Disable preemption after queueing stopper threads
    - stop_machine: Atomically queue and wake stopper threads

  * tcm_loop.ko: move from modules-extra into main modules package
    (LP: #1817786)
    - [Packaging] move tcm_loop.lo to main linux-modules package

  * tcmu user space crash results in kernel module hang. (LP: #1819504)
    - scsi: tcmu: delete unused __wait
    - scsi: tcmu: track nl commands
    - scsi: tcmu: simplify nl interface
    - scsi: tcmu: add module wide block/reset_netlink support

  * Intel XL710 - i40e driver does not work with kernel 4.15 (Ubuntu 18.04)
    (LP: #1779756)
    - i40e: Fix for Tx timeouts when interface is brought up if DCB is enabled
    - i40e: prevent overlapping tx_timeout recover

  * some codecs stop working after S3 (LP: #1820930)
    - ALSA: hda - Enforces runtime_resume after S3 and S4 for each codec

  * i40e xps management broken when > 64 queues/cpus (LP: #1820948)
    - i40e: Do not allow use more TC queue pairs than MSI-X vectors exist
    - i40e: Fix the number of queues available to be mapped for use

  * 4.15 s390x kernel BUG at /build/linux-
    Gycr4Z/linux-4.15.0/drivers/block/virtio_blk.c:565! (LP: #1788432)
    - virtio/s390: avoid race on vcdev->config
    - virtio/s390: fix race in ccw_io_helper()

  * [SRU][B/B-OEM/C/D] Fix AMD IOMMU NULL dereference (LP: #1820990)
    - iommu/amd: Fix NULL dereference bug in match_hid_uid

  * New Intel Wireless-AC 9260 [8086:2526] card not correctly probed in Ubuntu
    system (LP: #1821271)
    - iwlwifi: add new card for 9260 series

  * Add support for MAC address pass through on RTL8153-BD (LP: #1821276)
    - r8152: Add support for MAC address pass through on RTL8153-BD
    - r8152: Fix an error on RTL8153-BD MAC Address Passthrough support

 -- Andrea Righi <andrea.righi@xxxxxxxxxxxxx>  Tue, 02 Apr 2019 18:31:55
+0200

** Changed in: linux (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-5715

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-5754

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-3639

-- 
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https://bugs.launchpad.net/bugs/1821259

Title:
  Hard lockup in 2 CPUs due to deadlock in cpu_stoppers

Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * This problem hard locks up 2 CPUs in a deadlock, and this
     soft locks up other CPUs as an effect; the system becomes
     unusable.

   * This is relatively rare / difficult to hit because it's a
     corner case in scheduling/load balancing that needs timing
     with CPU stopper code. And it needs SMP plus _NUMA_ system.
     (but it can be hit with synthetic test case attached in LP.)

   * Since SMP plus NUMA usually equals _servers_ it looks like
     a good idea to prevent this bug / hard lockups / rebooting.

   * The fix resolves the potential deadlock by removing one of
     the calls required to deadlock from under the locked code.

  [Test Case]

   * There's a synthetic test case to reproduce this problem
     (although without the stack traces - just a system hang)
     attached to this LP bug.

   * It uses kprobes/mdelay/cpu stopper calls to force the code
     to execute and force the timing/locking condition to occur.

   * $ sudo insmod kmod-stopper.ko

     Some dmesg logging occurs, and systems either hangs or not.
     See examples in comments.
     
  [Regression Potential] 

   * These are patches to the cpu stop_machine.c code, and they
     change a bit how it works;  however, there are no upstream
     fixes for these patches anymore and they are still the top
     of the 'git log --oneline -- kernel/stop_machine.c' output.

   * These patches have been verified with the synthetic test case
     and 'stress-ng --class scheduler --sequential 0' (no regressions)
     on guest with 2 CPUs and one physical system with 24 CPUs.

  [Other Info]
   
   * The patches are required on Xenial and later.
   * There are 4 patches for Xenial, and 2 patches pending for Bionic.
   * All patches are applied from Cosmic onwards.

  [Original Description]

  These 2 hard lockups happened all of a sudden in the logs, and many
  soft lockups occur after them as a fallout.

      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.477086] NMI watchdog: Watchdog detected hard LOCKUP on cpu 10
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.483800] Modules linked in: <...>
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484066] CPU: 10 PID: 58 Comm: migration/10 Not tainted 4.4.0-116-generic #140~14.04.1-Ubuntu
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484068] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 02/17/2017
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484070] task: ffff883ff2a76200 ti: ffff883ff2110000 task.ti: ffff883ff2110000
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484071] RIP: 0010:[<ffffffff810c8cb0>]  [<ffffffff810c8cb0>] native_queued_spin_lock_slowpath+0x160/0x170
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484079] RSP: 0000:ffff883ff2113c58  EFLAGS: 00000002
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484080] RAX: 0000000000000101 RBX: 0000000000000086 RCX: 0000000000000001
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484081] RDX: 0000000000000101 RSI: 0000000000000001 RDI: ffff881fff991ba8
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484083] RBP: ffff883ff2113c58 R08: 0000000000000101 R09: ffff883ff082e200
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484084] R10: 0000000000002e04 R11: 0000000000002e04 R12: ffff881fff997c60
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484085] R13: ffff881fff991ba8 R14: 0000000000000000 R15: ffff881fff997300
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484087] FS:  0000000000000000(0000) GS:ffff883fff000000(0000) knlGS:0000000000000000
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484088] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484090] CR2: 00007f7caaa23020 CR3: 0000001f46740000 CR4: 0000000000160670
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484091] Stack:
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484092]  ffff883ff2113c68 ffffffff811870eb ffff883ff2113c80 ffffffff81819907
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484094]  ffff881fff991ba0 ffff883ff2113cb0 ffffffff8111c600 ffff881fff997300
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484096]  ffff881fff997c90 ffff881ff03dd400 0000000000000000 ffff883ff2113cc0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484098] Call Trace:
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484105]  [<ffffffff811870eb>] queued_spin_lock_slowpath+0xb/0xf
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484109]  [<ffffffff81819907>] _raw_spin_lock_irqsave+0x37/0x40
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484113]  [<ffffffff8111c600>] cpu_stop_queue_work+0x30/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484116]  [<ffffffff8111ccd0>] stop_one_cpu_nowait+0x30/0x40
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484119]  [<ffffffff810bbb5b>] load_balance+0x71b/0x940
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484122]  [<ffffffff810bbff5>] pick_next_task_fair+0x275/0x4b0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484126]  [<ffffffff81816166>] __schedule+0x6c6/0x7f0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484132]  [<ffffffff810a2560>] ? sort_range+0x30/0x30
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484134]  [<ffffffff818162c5>] schedule+0x35/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484136]  [<ffffffff810a262d>] smpboot_thread_fn+0xcd/0x180
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484139]  [<ffffffff8109f138>] kthread+0xd8/0xf0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484141]  [<ffffffff8109f060>] ? kthread_park+0x60/0x60
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484143]  [<ffffffff81819ff5>] ret_from_fork+0x55/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603802.484144]  [<ffffffff8109f060>] ? kthread_park+0x60/0x60

      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.644471] NMI watchdog: Watchdog detected hard LOCKUP on cpu 6
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651086] Modules linked in: <...>
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651342] CPU: 6 PID: 204932 Comm: ceph-osd Not tainted 4.4.0-116-generic #140~14.04.1-Ubuntu
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651344] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 02/17/2017
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651345] task: ffff881ff03dd400 ti: ffff883cda77c000 task.ti: ffff883cda77c000
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651347] RIP: 0010:[<ffffffff810aacb6>]  [<ffffffff810aacb6>] try_to_wake_up+0x86/0x3f0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651353] RSP: 0000:ffff883cda77fa78  EFLAGS: 00000002
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651354] RAX: 0000000000000001 RBX: ffff883ff2a76200 RCX: 0000000000000000
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651355] RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff883ff2a768d4
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651356] RBP: ffff883cda77fab8 R08: 000000000000000a R09: ffff881ff03dd400
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651357] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000017300
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651359] R13: ffff883ff2a768d4 R14: 0000000000000046 R15: 0000000000000000
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651360] FS:  00007ff8ecbc9700(0000) GS:ffff881fff980000(0000) knlGS:0000000000000000
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651362] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651363] CR2: 0000000014583550 CR3: 0000003d4ac96000 CR4: 0000000000160670
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651364] Stack:
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651365]  0000000000000202 ffff883cda77fa98 0000000000000003 0000000000000006
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651368]  000000000000000a ffff883cda77fb70 ffff883fff011ba0 ffff881fff991ba0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651370]  ffff883cda77fac8 ffffffff810ab035 ffff883cda77fbc8 ffffffff8111cc22
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651372] Call Trace:
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651375]  [<ffffffff810ab035>] wake_up_process+0x15/0x20
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651379]  [<ffffffff8111cc22>] stop_two_cpus+0x1b2/0x230
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651382]  [<ffffffff8111c650>] ? cpu_stop_queue_work+0x80/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651384]  [<ffffffff810b5d15>] ? dequeue_entity+0x455/0x8a0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651386]  [<ffffffff8111c650>] ? cpu_stop_queue_work+0x80/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651388]  [<ffffffff810aaa70>] ? __migrate_swap_task.part.83+0x80/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651390]  [<ffffffff810ab18e>] migrate_swap+0xae/0x130
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651392]  [<ffffffff810b4e44>] task_numa_migrate+0x504/0x930
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651394]  [<ffffffff810b52e9>] numa_migrate_preferred+0x79/0x80
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651396]  [<ffffffff810b9373>] task_numa_fault+0x923/0xcd0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651400]  [<ffffffff8175e407>] ? tcp_recvmsg+0x6b7/0xbd0
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651404]  [<ffffffff811da9be>] ? mpol_misplaced+0x14e/0x190
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651408]  [<ffffffff811b7836>] handle_pte_fault+0x5a6/0x1440
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651411]  [<ffffffff816f6693>] ? sock_recvmsg+0x43/0x50
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651413]  [<ffffffff811b9540>] handle_mm_fault+0x250/0x540
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651417]  [<ffffffff81069e1a>] __do_page_fault+0x19a/0x430
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651419]  [<ffffffff8106a0d2>] do_page_fault+0x22/0x30
      Nov 23 15:48:33 SYSTEM_NAME kernel: [4603805.651423]  [<ffffffff8181c5a8>] page_fault+0x28/0x30

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