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[Thomas Lamprecht <t.lamprecht@xxxxxxxxxxx>]

Follow up, I tried it with a Ubuntu Server and Alpine Linux without any
gui and it frozed also, same backtrace.

Sorry I could swear Alpine Linux did not froze when I first tested it in
a nested VM.

** Attachment added: "backtrace-qemu-migration-hang.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1540532/+attachment/4581648/+files/backtrace-qemu-migration-hang.log

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https://bugs.launchpad.net/bugs/1540532

Title:
  Wily update to v4.2.8-ckt3 stable release

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Wily:
  Fix Released

Bug description:
  SRU Justification

      Impact:
         The upstream process for stable tree updates is quite similar
         in scope to the Ubuntu SRU process, e.g., each patch has to
         demonstrably fix a bug, and each patch is vetted by upstream
         by originating either directly from a mainline/stable Linux tree or
         a minimally backported form of that patch. The v4.2.8-ckt3 upstream stable
         patch set is now available. It should be included in the Ubuntu
         kernel as well.

         git://kernel.ubuntu.com/ubuntu/linux.git

      TEST CASE: TBD

         The following patches from the v4.2.8-ckt3 stable release shall
  be applied:

  Linux 4.2.8-ckt3
  ipv6: update skb->csum when CE mark is propagated
  vxlan: fix test which detect duplicate vxlan iface
  batman-adv: Drop immediate batadv_hard_iface free function
  net: bpf: reject invalid shifts
  phonet: properly unshare skbs in phonet_rcv()
  net: preserve IP control block during GSO segmentation
  udp: disallow UFO for sockets with SO_NO_CHECK option
  sched,cls_flower: set key address type when present
  tcp_yeah: don't set ssthresh below 2
  bridge: Only call /sbin/bridge-stp for the initial network namespace
  unix: properly account for FDs passed over unix sockets
  af_unix: Fix splice-bind deadlock
  connector: bump skb->users before callback invocation
  sctp: sctp should release assoc when sctp_make_abort_user return NULL in sctp_close
  net: cdc_ncm: avoid changing RX/TX buffers on MTU changes
  veth: don’t modify ip_summed; doing so treats packets with bad checksums as good.
  NFS: Ensure we revalidate attributes before using execute_ok()
  NFSv4: Don't perform cached access checks before we've OPENed the file
  net/mlx4: Remove unused macro
  IB/mlx4: Initialize hop_limit when creating address handle
  mmc: debugfs: correct wrong voltage value
  team: Replace rcu_read_lock with a mutex in team_vlan_rx_kill_vid
  ARM: dts: armadillo800eva Correct extal1 frequency to 24 MHz
  printk: help pr_debug and pr_devel to optimize out arguments
  batman-adv: Drop immediate orig_node free function
  batman-adv: Drop immediate neigh_ifinfo free function
  batman-adv: Drop immediate batadv_neigh_node free function
  batman-adv: Drop immediate batadv_orig_ifinfo free function
  batman-adv: Avoid recursive call_rcu for batadv_nc_node
  batman-adv: Avoid recursive call_rcu for batadv_bla_claim
  bridge: fix lockdep addr_list_lock false positive splat
  btrfs: initialize the seq counter in struct btrfs_device
  Btrfs: clean up an error code in btrfs_init_space_info()
  include/linux/memblock.h: fix ordering of 'flags' argument in comments
  vmstat: make vmstat_updater deferrable again and shut down on idle
  net: tcp_memcontrol: properly detect ancestor socket pressure
  mmc: sd: limit SD card power limit according to cards capabilities
  kbuild: Demote 'sign-compare' warning to W=2
  bonding: Prevent IPv6 link local address on enslaved devices
  ipv6: tcp: add rcu locking in tcp_v6_send_synack()
  net: sctp: prevent writes to cookie_hmac_alg from accessing invalid memory
  um: Fix build error and kconfig for i386
  m68k/atari, m68k/sun3: Fix SCSI platform device registration when driver is modular
  phy: micrel: Fix finding PHY properties in MAC node for KSZ9031.
  target: Fix a memory leak in target_dev_lba_map_store()
  firmware: actually return NULL on failed request_firmware_nowait()
  power: test_power: correctly handle empty writes
  perf/x86: fix PEBS issues on Intel Atom/Core2
  perf/x86: Fix filter_events() bug with event mappings
  kconfig: return 'false' instead of 'no' in bool function
  sysrq: Fix warning in sysrq generated crash.
  x86/LDT: Print the real LDT base address
  mmc: sdhci: restore behavior when setting VDD via external regulator
  pinctrl: bcm2835: Fix memory leak in error path
  ALSA: fm801: detect FM-only card earlier
  ALSA: fm801: propagate TUNER_ONLY bit when autodetected
  ARM: imx: select SRC for i.MX7
  ALSA: fm801: explicitly free IRQ line
  tpm_tis: Use devm_free_irq not free_irq
  Drivers: hv: utils: use memdup_user in hvt_op_write
  Drivers: hv: util: catch allocation errors
  mtd: nand: denali: add missing nand_release() call in denali_remove()
  Revert "ACPI / LPSS: allow to use specific PM domain during ->probe()"
  mac80211: fix mgmt-tx abort cookie and leak
  mtd: nand: fix ONFI parameter page layout
  ASoC: tegra_alc5632: check return value
  ath9k_htc: check for underflow in ath9k_htc_rx_msg()
  PCI/MSI: Initialize MSI capability for all architectures
  ASoC: Intel: pass correct parameter in sst_alloc_stream_mrfld()
  MAINTAINERS: gpio-brcmstb: Remove stray '>'
  clk: st: avoid uninitialized variable use
  clk: xgene: Fix divider with non-zero shift value
  SCSI: initio: remove duplicate module device table
  [media] lirc_imon: do not leave imon_probe() with mutex held
  [media] rc: allow rc modules to be loaded if rc-main is not a module
  drm/i915: On fb alloc failure, unref gem object where it gets refed
  ideapad-laptop: Add Lenovo Yoga 700 to no_hw_rfkill dmi list
  MIPS: Fix some missing CONFIG_CPU_MIPSR6 #ifdefs
  MAINTAINERS: return arch/sh to maintained state, with new maintainers
  make sure that freeing shmem fast symlinks is RCU-delayed
  pNFS/flexfiles: Fix an XDR encoding bug in layoutreturn
  ocfs2: NFS hangs in __ocfs2_cluster_lock due to race with ocfs2_unblock_lock
  MIPS: hpet: Choose a safe value for the ETIME check
  MIPS: Loongson-3: Fix SMP_ASK_C0COUNT IPI handler
  libceph: fix ceph_msg_revoke()
  ALSA: timer: Handle disconnection more safely
  prctl: take mmap sem for writing to protect against others
  zsmalloc: fix migrate_zspage-zs_free race condition
  ALSA: hda - Flush the pending probe work at remove
  crypto: algif_skcipher - sendmsg SG marking is off by one
  iscsi-target: Fix potential dead-lock during node acl delete
  Btrfs: fix deadlock running delayed iputs at transaction commit time
  ideapad-laptop: Add Lenovo ideapad Y700-17ISK to no_hw_rfkill dmi list
  IB/cm: Fix a recently introduced deadlock
  IB/mlx5: Expose correct maximum number of CQE capacity
  IB/qib: Support creating qps with GFP_NOIO flag
  IB/qib: fix mcast detach when qp not attached
  crypto: crc32c - Fix crc32c soft dependency
  crypto: algif_skcipher - Load TX SG list after waiting
  xfs: log mount failures don't wait for buffers to be released
  ARM: debug-ll: fix BCM63xx entry for multiplatform
  ALSA: control: Avoid kernel warnings from tlv ioctl with numid 0
  ALSA: seq: Fix snd_seq_call_port_info_ioctl in compat mode
  ALSA: pcm: Fix snd_pcm_hw_params struct copy in compat mode
  dmaengine: at_xdmac: fix resume for cyclic transfers
  ALSA: hrtimer: Fix stall by hrtimer_cancel()
  crypto: algif_skcipher - Fix race condition in skcipher_check_key
  crypto: algif_hash - Fix race condition in hash_check_key
  lib: sw842: select crc32
  crypto: af_alg - Forbid bind(2) when nokey child sockets are present
  crypto: algif_skcipher - Remove custom release parent function
  crypto: algif_hash - Remove custom release parent function
  crypto: af_alg - Allow af_af_alg_release_parent to be called on nokey path
  crypto: algif_hash - Require setkey before accept(2)
  crypto: hash - Add crypto_ahash_has_setkey
  crypto: algif_skcipher - Add nokey compatibility path
  crypto: af_alg - Add nokey compatibility path
  crypto: af_alg - Fix socket double-free when accept fails
  crypto: af_alg - Disallow bind/setkey/... after accept(2)
  crypto: algif_skcipher - Require setkey before accept(2)
  ALSA: hda - Fix bass pin fixup for ASUS N550JX
  printk: do cond_resched() between lines while outputting to consoles
  kernel/panic.c: turn off locks debug before releasing console lock
  panic: release stale console lock to always get the logbuf printed out
  memcg: only free spare array when readers are done
  zram: don't call idr_remove() from zram_remove()
  mm: soft-offline: check return value in second __get_any_page() call
  ACPI / video: Add disable_backlight_sysfs_if quirk for the Toshiba Satellite R830
  ACPI / video: Add disable_backlight_sysfs_if quirk for the Toshiba Portege R700
  zram: try vmalloc() after kmalloc()
  zram/zcomp: use GFP_NOIO to allocate streams
  ALSA: timer: Harden slave timer list handling
  ALSA: hda - Add fixup for Dell Latitidue E6540
  ocfs2/dlm: ignore cleaning the migration mle that is inuse
  scripts/bloat-o-meter: fix python3 syntax error
  dma-debug: switch check from _text to _stext
  m32r: fix m32104ut_defconfig build fail
  cifs_dbg() outputs an uninitialized buffer in cifs_readdir()
  cifs: fix race between call_async() and reconnect()
  cifs: Ratelimit kernel log messages
  sparc64: fix incorrect sign extension in sys_sparc64_personality
  ALSA: timer: Fix race among timer ioctls
  mmc: mmci: fix an ages old detection error
  dmaengine: dw: fix cyclic transfer callbacks
  dmaengine: dw: fix cyclic transfer setup
  ALSA: timer: Fix double unlink of active_list
  x86/mm: Improve switch_mm() barrier comments
  drm/i915: intel_hpd_init(): Fix suspend/resume reprobing
  drm/i915: Restore inhibiting the load of the default context
  ALSA: usb-audio: Fix mixer ctl regression of Native Instrument devices
  ALSA: hda - fix the headset mic detection problem for a Dell laptop
  powerpc/module: Handle R_PPC64_ENTRY relocations
  scripts/recordmcount.pl: support data in text section on powerpc
  parisc: Fix __ARCH_SI_PREAMBLE_SIZE
  ALSA: hda - Fix white noise on Dell Latitude E5550
  virtio_balloon: fix race between migration and ballooning
  virtio_balloon: fix race by fill and leak
  ALSA: seq: Fix race at timer setup and close
  ALSA: seq: Fix missing NULL check at remove_events ioctl
  x86/reboot/quirks: Add iMac10,1 to pci_reboot_dmi_table[]
  Input: elantech - mark protocols v2 and v3 as semi-mt
  clocksource/drivers/vt8500: Increase the minimum delta
  xfs: handle dquot buffer readahead in log recovery correctly
  xfs: inode recovery readahead can race with inode buffer creation
  s390: fix normalization bug in exception table sorting
  x86/boot: Double BOOT_HEAP_SIZE to 64KB
  x86/mm: Add barriers and document switch_mm()-vs-flush synchronization
  ALSA: hda - Fixup inverted internal mic for Lenovo E50-80
  ALSA: usb: Add native DSD support for Oppo HA-1
  drm/nouveau/kms: take mode_config mutex in connector hotplug path
  uml: flush stdout before forking
  uml: fix hostfs mknod()
  dm snapshot: fix hung bios when copy error occurs
  ASoC: compress: Fix compress device direction check
  scsi: add Synology to 1024 sector blacklist
  locks: fix unlock when fcntl_setlk races with a close
  iwlwifi: pcie: properly configure the debug buffer size for 8000
  iwlwifi: update and fix 7265 series PCI IDs
  btrfs: handle invalid num_stripes in sys_array
  PCI: host: Mark PCIe/PCI (MSI) IRQ cascade handlers as IRQF_NO_THREAD
  PCI: Fix minimum allocation address overwrite
  drm/dp/mst: fix in RAD element access
  drm/dp/mst: fix in MSTB RAD initialization
  drm/dp/mst: always send reply for UP request
  drm/dp/mst: process broadcast messages correctly
  udf: Check output buffer length when converting name to CS0
  udf: Prevent buffer overrun with multi-byte characters
  x86/xen: don't reset vcpu_info on a cancelled suspend
  libxfs: pack the agfl header structure so XFS_AGFL_SIZE is correct
  Input: i8042 - add Fujitsu Lifebook U745 to the nomux list
  wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)
  bcache: Change refill_dirty() to always scan entire disk if necessary
  bcache: allows use of register in udev to avoid "device_busy" error.
  bcache: unregister reboot notifier if bcache fails to unregister device
  bcache: fix a leak in bch_cached_dev_run()
  bcache: clear BCACHE_DEV_UNLINK_DONE flag when attaching a backing device
  bcache: Add a cond_resched() call to gc
  bcache: fix a livelock when we cause a huge number of cache misses
  rtlwifi: rtl_pci: Fix kernel panic
  NFS: Fix attribute cache revalidation
  rtlwifi: rtl8192cu: Add missing parameter setup
  rtlwifi: rtl8192ce: Fix handling of module parameters
  rtlwifi: rtl8192se: Fix module parameter initialization
  rtlwifi: rtl8192de: Fix incorrect module parameter descriptions
  rtlwifi: rtl8188ee: Fix module parameter initialization
  rtlwifi: rtl8821ae: Fix errors in parameter initialization
  rtlwifi: rtl8723ae: Fix initialization of module parameters
  rtlwifi: rtl8723be: Fix module parameter initialization
  posix-clock: Fix return code on the poll method's error path
  Thermal: do thermal zone update after a cooling device registered
  Thermal: handle thermal zone device properly during system sleep
  Thermal: initialize thermal zone device correctly
  USB: cp210x: add ID for ELV Marble Sound Board 1
  nfs: Fix race in __update_open_stateid()
  [media] rc: sunxi-cir: Initialize the spinlock properly
  udf: limit the maximum number of indirect extents in a row
  regulator: axp20x: Fix GPIO LDO enable value for AXP22x
  mmc: sdhci: Fix sdhci_runtime_pm_bus_on/off()
  mmc: sdhci: Fix DMA descriptor with zero data length
  mmc: sdio: Fix invalid vdd in voltage switch power cycle
  mmc: sdhci-pci: Do not default to 33 Ohm driver strength for Intel SPT
  mmc: mmc: Fix incorrect use of driver strength switching HS200 and HS400
  drm/radeon: clean up fujitsu quirks
  drm/amdgpu: Fix off-by-one errors in amdgpu_vm_bo_map
  drm/radeon: Fix off-by-one errors in radeon_vm_bo_set_addr
  coresight: checking for NULL string in coresight_name_match()
  arm64: kernel: enforce pmuserenr_el0 initialization and restore
  arm64: mdscr_el1: avoid exposing DCC to userspace
  futex: Drop refcount if requeue_pi() acquired the rtmutex
  drm/radeon: Fix "slow" audio over DP on DCE8+
  dm thin: fix race condition when destroying thin pool workqueue
  iommu/io-pgtable-arm: Ensure we free the final level on teardown
  clk: exynos: use irqsave version of spin_lock to avoid deadlock with irqs
  tools: hv: vss: fix the write()'s argument: error -> vss_msg
  Drivers: hv: vmbus: Fix a Host signaling bug
  dm space map metadata: remove unused variable in brb_pop()
  powerpc: Make {cmp}xchg* and their atomic_ versions fully ordered
  powerpc: Make value-returning atomics fully ordered
  arm64: mm: ensure that the zero page is visible to the page table walker
  EDAC: Robustify workqueues destruction
  EDAC, mc_sysfs: Fix freeing bus' name
  ovl: check dentry positiveness in ovl_cleanup_whiteouts()
  ovl: setattr: check permissions before copy-up
  wlcore/wl12xx: spi: fix oops on firmware load
  rtlwifi: fix memory leak for USB device
  ext4 crypto: add missing locking for keyring_key access
  ext4 crypto: exit cleanly if ext4_derive_key_aes() fails
  Bluetooth: Add support of Toshiba Broadcom based devices
  ovl: root: copy attr
  time: Avoid signed overflow in timekeeping_get_ns()
  arm64: Clear out any singlestep state on a ptrace detach operation
  ARM: mvebu: remove duplicated regulator definition in Armada 388 GP
  xhci: refuse loading if nousb is used
  drm/radeon: call hpd_irq_event on resume
  drm/amdgpu: call hpd_irq_event on resume
  KVM: x86: correctly print #AC in traces
  KVM: x86: expose MSR_TSC_AUX to userspace
  cxl: use correct operator when writing pcie config space values
  tools lib traceevent: Fix output of %llu for 64 bit values read on 32 bit machines
  [media] si2157: return -EINVAL if firmware blob is too big
  [media] media: dvb-core: Don't force CAN_INVERSION_AUTO in oneshot mode
  [media] gspca: ov534/topro: prevent a division by 0
  [media] vb2: fix a regression in poll() behavior for output,streams
  ovl: use a minimal buffer in ovl_copy_xattr
  ovl: allow zero size xattr
  drm/nouveau/nv46: Change mc subdev oclass from nv44 to nv4c

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