** Attachment added: "lspci-vnvn log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1722311/+attachment/4965976/+files/lspci-vnvn.log

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https://bugs.launchpad.net/bugs/1722311

Title:
  softlockups/rcu sched

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  1.$ lsb_release -rd
  Description:  Ubuntu Artful Aardvark (development branch)
  Release:      17.10

  2. $ apt-cache policy linux-image-virtual
  linux-image-virtual:
    Installed: 4.13.0.11.12
    Candidate: 4.13.0.11.12
    Version table:
   *** 4.13.0.11.12 500
          500 http://archive.ubuntu.com/ubuntu artful/main amd64 Packages
          100 /var/lib/dpkg/status

  
  3. System shutsdown cleanly, qemu exits non-zero

  4. System stays hung until testcase timesout.

  Single VCPU kvm guest on Artful host.

  Reached target Shutdown.
  [   60.036030] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [   88.036012] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [   96.920015] INFO: rcu_sched detected stalls on CPUs/tasks:
  [   96.920526]        (detected by 0, t=15002 jiffies, g=3321, c=3320, q=377)
  [   96.921161] All QSes seen, last rcu_sched kthread activity 15002 
(4294916526-4294901524), jiffies_till_next_fqs=1, root ->qsmask 0x0
  [   96.922409] rcu_sched kthread starved for 15002 jiffies! g3321 c3320 f0x2 
RCU_GP_WAIT_FQS(3) ->state=0x0
  [  124.036015] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [  152.036020] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [  180.036016] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [  208.036013] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [  236.036015] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [  264.036012] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [systemd:1]
  [  276.940010] INFO: rcu_sched detected stalls on CPUs/tasks:
  [  276.940520]        (detected by 0, t=60007 jiffies, g=3321, c=3320, q=377)
  [  276.941088] All QSes seen, last rcu_sched kthread activity 60007 
(4294961531-4294901524), jiffies_till_next_fqs=1, root ->qsmask 0x0
  [  276.942165] rcu_sched kthread starved for 60007 jiffies! g3321 c3320 f0x2 
RCU_GP_WAIT_FQS(3) ->state=0x0

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: linux-image-4.13.0-11-generic 4.13.0-11.12
  ProcVersionSignature: User Name 4.13.0-11.12-generic 4.13.1
  Uname: Linux 4.13.0-11-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Oct  9 15:06 seq
   crw-rw---- 1 root audio 116, 33 Oct  9 15:06 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  Date: Mon Oct  9 15:13:30 2017
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-11-generic 
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-11-generic N/A
   linux-backports-modules-4.13.0-11-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-artful
  dmi.modalias: 
dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-artful:cvnQEMU:ct1:cvrpc-i440fx-artful:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-artful
  dmi.sys.vendor: QEMU

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