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[Launchpad Bug Tracker <1349028@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-101.102

---------------
linux (4.15.0-101.102) bionic; urgency=medium

  * bionic/linux: 4.15.0-101.102 -proposed tracker (LP: #1877262)

  * 4.15.0-100.101 breaks userspace builds due to a bug in the headers
    /usr/include/linux/swab.h of linux-libc-dev (LP: #1877123)
    - include/uapi/linux/swab.h: fix userspace breakage, use __BITS_PER_LONG for
      swap

  * bionic snapdragon 4.15 snap failed Certification testing (LP: #1877657)
    - Revert "drm/msm: Use the correct dma_sync calls in msm_gem"
    - Revert "drm/msm: stop abusing dma_map/unmap for cache"

linux (4.15.0-100.101) bionic; urgency=medium

  * bionic/linux: 4.15.0-100.101 -proposed tracker (LP: #1875878)

  * built-using constraints preventing uploads (LP: #1875601)
    - temporarily drop Built-Using data

  * Add debian/rules targets to compile/run kernel selftests (LP: #1874286)
    - [Packaging] add support to compile/run selftests

  * getitimer returns it_value=0 erroneously (LP: #1349028)
    - [Config] CONTEXT_TRACKING_FORCE policy should be unset

  * QEMU/KVM display is garbled when booting from kernel EFI stub due to missing
    bochs-drm module (LP: #1872863)
    - [Config] Enable CONFIG_DRM_BOCHS as module for all archs

  * Backport MPLS patches from 5.3 to 4.15 (LP: #1851446)
    - net/mlx5e: Report netdevice MPLS features
    - net: vlan: Inherit MPLS features from parent device
    - net: bonding: Inherit MPLS features from slave devices
    - net/mlx5e: Move to HW checksumming advertising

  * LIO hanging in iscsit_free_session and iscsit_stop_session (LP: #1871688)
    - scsi: target: remove boilerplate code
    - scsi: target: fix hang when multiple threads try to destroy the same iscsi
      session
    - scsi: target: iscsi: calling iscsit_stop_session() inside
      iscsit_close_session() has no effect

  * Add hw timestamps to received skbs in peak_canfd (LP: #1874124)
    - can: peak_canfd: provide hw timestamps in rx skbs

  * Bionic update: upstream stable patchset 2020-04-23 (LP: #1874502)
    - ARM: dts: sun8i-a83t-tbs-a711: HM5065 doesn't like such a high voltage
    - bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads
    - net: vxge: fix wrong __VA_ARGS__ usage
    - hinic: fix a bug of waitting for IO stopped
    - hinic: fix wrong para of wait_for_completion_timeout
    - cxgb4/ptp: pass the sign of offset delta in FW CMD
    - qlcnic: Fix bad kzalloc null test
    - i2c: st: fix missing struct parameter description
    - firmware: arm_sdei: fix double-lock on hibernate with shared events
    - null_blk: Fix the null_add_dev() error path
    - null_blk: Handle null_add_dev() failures properly
    - null_blk: fix spurious IO errors after failed past-wp access
    - xhci: bail out early if driver can't accress host in resume
    - x86: Don't let pgprot_modify() change the page encryption bit
    - block: keep bdi->io_pages in sync with max_sectors_kb for stacked devices
    - irqchip/versatile-fpga: Handle chained IRQs properly
    - sched: Avoid scale real weight down to zero
    - selftests/x86/ptrace_syscall_32: Fix no-vDSO segfault
    - PCI/switchtec: Fix init_completion race condition with poll_wait()
    - libata: Remove extra scsi_host_put() in ata_scsi_add_hosts()
    - gfs2: Don't demote a glock until its revokes are written
    - x86/boot: Use unsigned comparison for addresses
    - efi/x86: Ignore the memory attributes table on i386
    - genirq/irqdomain: Check pointer in irq_domain_alloc_irqs_hierarchy()
    - block: Fix use-after-free issue accessing struct io_cq
    - usb: dwc3: core: add support for disabling SS instances in park mode
    - irqchip/gic-v4: Provide irq_retrigger to avoid circular locking dependency
    - md: check arrays is suspended in mddev_detach before call quiesce operations
    - locking/lockdep: Avoid recursion in lockdep_count_{for,back}ward_deps()
    - block, bfq: fix use-after-free in bfq_idle_slice_timer_body
    - btrfs: qgroup: ensure qgroup_rescan_running is only set when the worker is
      at least queued
    - btrfs: remove a BUG_ON() from merge_reloc_roots()
    - btrfs: track reloc roots based on their commit root bytenr
    - uapi: rename ext2_swab() to swab() and share globally in swab.h
    - slub: improve bit diffusion for freelist ptr obfuscation
    - ASoC: fix regwmask
    - ASoC: dapm: connect virtual mux with default value
    - ASoC: dpcm: allow start or stop during pause for backend
    - ASoC: topology: use name_prefix for new kcontrol
    - usb: gadget: f_fs: Fix use after free issue as part of queue failure
    - usb: gadget: composite: Inform controller driver of self-powered
    - ALSA: usb-audio: Add mixer workaround for TRX40 and co
    - ALSA: hda: Add driver blacklist
    - ALSA: hda: Fix potential access overflow in beep helper
    - ALSA: ice1724: Fix invalid access for enumerated ctl items
    - ALSA: pcm: oss: Fix regression by buffer overflow fix
    - ALSA: doc: Document PC Beep Hidden Register on Realtek ALC256
    - ALSA: hda/realtek - Set principled PC Beep configuration for ALC256
    - ALSA: hda/realtek - Remove now-unnecessary XPS 13 headphone noise fixups
    - ALSA: hda/realtek - Add quirk for MSI GL63
    - media: ti-vpe: cal: fix disable_irqs to only the intended target
    - acpi/x86: ignore unspecified bit positions in the ACPI global lock field
    - thermal: devfreq_cooling: inline all stubs for CONFIG_DEVFREQ_THERMAL=n
    - nvme-fc: Revert "add module to ops template to allow module references"
    - nvme: Treat discovery subsystems as unique subsystems
    - PCI/ASPM: Clear the correct bits when enabling L1 substates
    - PCI: Add boot interrupt quirk mechanism for Xeon chipsets
    - PCI: endpoint: Fix for concurrent memory allocation in OB address region
    - irqchip/versatile-fpga: Apply clear-mask earlier
    - pstore: pstore_ftrace_seq_next should increase position index
    - MIPS/tlbex: Fix LDDIR usage in setup_pw() for Loongson-3
    - MIPS: OCTEON: irq: Fix potential NULL pointer dereference
    - ath9k: Handle txpower changes even when TPC is disabled
    - signal: Extend exec_id to 64bits
    - x86/entry/32: Add missing ASM_CLAC to general_protection entry
    - KVM: nVMX: Properly handle userspace interrupt window request
    - KVM: s390: vsie: Fix region 1 ASCE sanity shadow address checks
    - KVM: s390: vsie: Fix delivery of addressing exceptions
    - KVM: x86: Allocate new rmap and large page tracking when moving memslot
    - KVM: VMX: Always VMCLEAR in-use VMCSes during crash with kexec support
    - CIFS: Fix bug which the return value by asynchronous read is error
    - Btrfs: fix crash during unmount due to race with delayed inode workers
    - btrfs: set update the uuid generation as soon as possible
    - btrfs: drop block from cache on error in relocation
    - btrfs: fix missing semaphore unlock in btrfs_sync_file
    - crypto: mxs-dcp - fix scatterlist linearization for hash
    - powerpc/pseries: Drop pointless static qualifier in vpa_debugfs_init()
    - x86/speculation: Remove redundant arch_smt_update() invocation
    - tools: gpio: Fix out-of-tree build regression
    - mm: Use fixed constant in page_frag_alloc instead of size + 1
    - dm verity fec: fix memory leak in verity_fec_dtr
    - scsi: zfcp: fix missing erp_lock in port recovery trigger for point-to-point
    - arm64: armv8_deprecated: Fix undef_hook mask for thumb setend
    - selftests: vm: drop dependencies on page flags from mlock2 tests
    - rtc: omap: Use define directive for PIN_CONFIG_ACTIVE_HIGH
    - drm/etnaviv: rework perfmon query infrastructure
    - NFS: Fix a page leak in nfs_destroy_unlinked_subrequests()
    - ext4: fix a data race at inode->i_blocks
    - fs/filesystems.c: downgrade user-reachable WARN_ONCE() to pr_warn_once()
    - ocfs2: no need try to truncate file beyond i_size
    - perf tools: Support Python 3.8+ in Makefile
    - s390/diag: fix display of diagnose call statistics
    - Input: i8042 - add Acer Aspire 5738z to nomux list
    - kmod: make request_module() return an error when autoloading is disabled
    - cpufreq: powernv: Fix use-after-free
    - hfsplus: fix crash and filesystem corruption when deleting files
    - ipmi: fix hung processes in __get_guid()
    - powerpc/powernv/idle: Restore AMR/UAMOR/AMOR after idle
    - powerpc/64/tm: Don't let userspace set regs->trap via sigreturn
    - powerpc/hash64/devmap: Use H_PAGE_THP_HUGE when setting up huge devmap PTE
      entries
    - powerpc/xive: Use XIVE_BAD_IRQ instead of zero to catch non configured IPIs
    - powerpc/kprobes: Ignore traps that happened in real mode
    - scsi: mpt3sas: Fix kernel panic observed on soft HBA unplug
    - powerpc: Add attributes for setjmp/longjmp
    - powerpc: Make setjmp/longjmp signature standard
    - btrfs: use nofs allocations for running delayed items
    - dm zoned: remove duplicate nr_rnd_zones increase in dmz_init_zone()
    - crypto: caam - update xts sector size for large input length
    - Revert "drm/dp_mst: Remove VCPI while disabling topology mgr"
    - drm/dp_mst: Fix clearing payload state on topology disable
    - drm: Remove PageReserved manipulation from drm_pci_alloc
    - ftrace/kprobe: Show the maxactive number on kprobe_events
    - powerpc/fsl_booke: Avoid creating duplicate tlb1 entry
    - misc: echo: Remove unnecessary parentheses and simplify check for zero
    - etnaviv: perfmon: fix total and idle HI cyleces readout
    - mfd: dln2: Fix sanity checking for endpoints
    - efi/x86: Fix the deletion of variables in mixed mode

  * Panic on suspend/resume Kernel panic - not syncing: stack-protector: Kernel
    stack is corrupted in: sata_pmp_eh_recover+0xa2b/0xa40 (LP: #1821434) //
    Bionic update: upstream stable patchset 2020-04-23 (LP: #1874502)
    - libata: Return correct status in sata_pmp_eh_recover_pm() when
      ATA_DFLAG_DETACH is set

  * Bionic update: upstream stable patchset 2020-04-15 (LP: #1873043)
    - ipv4: fix a RCU-list lock in fib_triestat_seq_show
    - net, ip_tunnel: fix interface lookup with no key
    - sctp: fix refcount bug in sctp_wfree
    - sctp: fix possibly using a bad saddr with a given dst
    - drm/bochs: downgrade pci_request_region failure from error to warning
    - initramfs: restore default compression behavior
    - tools/power turbostat: Fix gcc build warnings
    - drm/etnaviv: replace MMU flush marker with flush sequence
    - blk-mq: sync the update nr_hw_queues with blk_mq_queue_tag_busy_iter
    - blk-mq: Allow blocking queue tag iter callbacks
    - misc: pci_endpoint_test: Fix to support > 10 pci-endpoint-test devices
    - coresight: do not use the BIT() macro in the UAPI header
    - padata: always acquire cpu_hotplug_lock before pinst->lock
    - mm: mempolicy: require at least one nodeid for MPOL_PREFERRED
    - ipv6: don't auto-add link-local address to lag ports
    - net: dsa: bcm_sf2: Ensure correct sub-node is parsed
    - net: phy: micrel: kszphy_resume(): add delay after genphy_resume() before
      accessing PHY registers
    - net: stmmac: dwmac1000: fix out-of-bounds mac address reg setting
    - mlxsw: spectrum_flower: Do not stop at FLOW_ACTION_VLAN_MANGLE
    - random: always use batched entropy for get_random_u{32,64}
    - tools/accounting/getdelays.c: fix netlink attribute length
    - hwrng: imx-rngc - fix an error path
    - ASoC: jz4740-i2s: Fix divider written at incorrect offset in register
    - IB/hfi1: Call kobject_put() when kobject_init_and_add() fails
    - IB/hfi1: Fix memory leaks in sysfs registration and unregistration
    - ceph: remove the extra slashes in the server path
    - ceph: canonicalize server path in place
    - Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl
    - RDMA/cm: Update num_paths in cma_resolve_iboe_route error flow
    - fbcon: fix null-ptr-deref in fbcon_switch
    - clk: qcom: rcg: Return failure for RCG update
    - drm/msm: stop abusing dma_map/unmap for cache
    - arm64: Fix size of __early_cpu_boot_status
    - rpmsg: glink: Remove chunk size word align warning
    - usb: dwc3: don't set gadget->is_otg flag
    - drm_dp_mst_topology: fix broken drm_dp_sideband_parse_remote_dpcd_read()
    - drm/msm: Use the correct dma_sync calls in msm_gem
    - misc: rtsx: set correct pcr_ops for rts522A
    - mei: me: add cedar fork device ids
    - power: supply: axp288_charger: Add special handling for HP Pavilion x2 10
    - rxrpc: Fix sendmsg(MSG_WAITALL) handling
    - bitops: protect variables in set_mask_bits() macro
    - RDMA/ucma: Put a lock around every call to the rdma_cm layer
    - RDMA/cma: Teach lockdep about the order of rtnl and lock

  * CVE-2020-11494
    - slcan: Don't transmit uninitialized stack data in padding

  * add_key05 from ubuntu_ltp_syscalls failed (LP: #1869644)
    - KEYS: reaching the keys quotas correctly

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Mon, 11 May
2020 11:08:26 +0200

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-11494

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https://bugs.launchpad.net/bugs/1349028

Title:
  getitimer returns it_value=0 erroneously

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Eoan:
  Fix Committed
Status in linux source package in Focal:
  Fix Released

Bug description:
  According to the 'getitimer()' man page: "The element it_value is set
  to the amount of time remaining on the timer, or zero if the  timer is
  disabled.  Similarly, it_interval is set to the reset value."

  As such the following Perl program should never exit:

      use Time::HiRes;
      $SIG{VTALRM} = sub { };
      Time::HiRes::setitimer(&Time::HiRes::ITIMER_VIRTUAL, 0.5, 0.4);
      while (1) {
          my @t = Time::HiRes::getitimer(&Time::HiRes::ITIMER_VIRTUAL);
          exit 0 if $t[0] == 0;
      }

  and on linux-image 3.11.0-18-generic (and all other systems tested) it
  loops forever but 3.13.0-32-generic it exits.  Have not bisected
  between those kernels, nor am I likely to be able to do so soon.

  This Perl program shows the timer countdown:

  use Time::HiRes;
  my $r = [Time::HiRes::gettimeofday()];
  sub display {
      my ($desc) = @_;
      my @t = Time::HiRes::getitimer(&Time::HiRes::ITIMER_VIRTUAL);
      my $i = Time::HiRes::tv_interval($r);
      printf "%s: elasped=%.8f; time left=%.6f reset time=%.6f\n", $desc,
      $i,@t;
  }
  $SIG{VTALRM} = sub {
      display('VTALRM');
      exit;
  };
  Time::HiRes::setitimer(&Time::HiRes::ITIMER_VIRTUAL, 0.5, 0.4);
  while (1) {
      display('inloop');
  }

  on other (working) systems it gives:

  inloop: elasped=1.65178400; time left=0.001000 reset time=0.401000
  inloop: elasped=1.65184200; time left=0.001000 reset time=0.401000
  inloop: elasped=1.65186800; time left=0.001000 reset time=0.401000
  inloop: elasped=1.65192300; time left=0.001000 reset time=0.401000
  inloop: elasped=1.65198100; time left=0.001000 reset time=0.401000
  VTALRM: elasped=1.65209800; time left=0.400000 reset time=0.401000
  (end of file)

  but on the 3.13.0-32-generic or later kernel I get:

  inloop: elasped=0.54692100; time left=0.000033 reset time=0.400000
  inloop: elasped=0.54692800; time left=0.000026 reset time=0.400000
  inloop: elasped=0.54693500; time left=0.000020 reset time=0.400000
  inloop: elasped=0.54694100; time left=0.000013 reset time=0.400000
  inloop: elasped=0.54694800; time left=0.000007 reset time=0.400000
  inloop: elasped=0.54695500; time left=0.000000 reset time=0.400000
  inloop: elasped=0.54696200; time left=0.004000 reset time=0.400000
  [...]
  VTALRM: elasped=0.55013600; time left=0.397062 reset time=0.400000
  (end of file)

  The reset time also looks dodgy.

  Hardware is an Intel Core i7-920 on Asus P6T Deluxe v2 (X58)
  motherboard and hasn't changed.

  
  Requested information:

  Ubuntu 3.13.0-32.57-generic 3.13.11.4

  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  # apt-cache policy linux-image-generic
  linux-image-generic:
    Installed: 3.13.0.32.38
    Candidate: 3.13.0.32.38
    Version table:
   *** 3.13.0.32.38 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          500 http://us.archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
          500 http://us.archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
          500 http://ppa.launchpad.net/canonical-kernel-team/ppa/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
       3.13.0.24.28 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  tivrusky   3009 F.... pulseaudio
   /dev/snd/controlC0:  tivrusky   3009 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=c026abdc-9fee-425c-b5ae-020bf6ea2ad6
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: root=UUID=3ea7a4cb-eade-4906-b545-5133d8c14080 ro quiet splash
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2014-06-10 (46 days ago)
  UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare vboxusers
  WifiSyslog: Jul 26 20:23:08 zwei NetworkManager[1174]: <info> Policy set 'Wired connection 2' (eth1) as default for IPv6 routing and DNS.
  WpaSupplicantLog:
   
  _MarkForUpload: True
  dmi.bios.date: 02/04/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0203
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T DELUXE V2
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0203:bd02/04/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TDELUXEV2:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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