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[fmaste <556919@xxxxxxxxxxxxxxxxxx>]

Same here on 15.04

[ 9876.328007] perf interrupt took too long (3213 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[37825.813778] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [qemu-system-x86:1159]
[37825.813784] Modules linked in: vhost_net vhost macvtap macvlan xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables nls_iso8859_1 intel_rapl ppdev intel_powerclamp snd_hda_codec_hdmi coretemp kvm_intel snd_hda_codec_realtek snd_hda_codec_generic kvm joydev snd_intel_sst_acpi lpc_ich serio_raw snd_hda_intel snd_intel_sst_core snd_hda_controller snd_soc_rt5640 snd_soc_sst_mfld_platform snd_hda_codec snd_soc_rl6231 snd_soc_core snd_hwdep parport_pc snd_compress parport snd_pcm_dmaengine 8250_fintek snd_pcm dw_dmac dw_dmac_core i2c_hid snd_timer mei_txe snd spi_pxa2xx_platform rfkill_gpio mei mac_hid i2c_designware_platform i2c_designware_core soundcore snd_soc_sst_acpi iosf_mbi pwm_lpss_platform shpchp 8250_dw pwm_lpss autofs4 btrfs xor raid6_pq xts gf128mul dm_crypt hid_generic usbhid hid crct10dif_pclmul i915 crc32_pclmul ghash_clmulni_intel cryptd i2c_algo_bit drm_kms_helper psmouse r8169 drm ahci mii libahci video sdhci_acpi sdhci
[37825.813873] CPU: 0 PID: 1159 Comm: qemu-system-x86 Tainted: G        W      3.19.0-30-generic #34-Ubuntu
[37825.813875] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Q1900B-ITX, BIOS P1.70 11/04/2014
[37825.813878] task: ffff88013956c4b0 ti: ffff8800aa2f8000 task.ti: ffff8800aa2f8000
[37825.813881] RIP: 0010:[<ffffffff817cba92>]  [<ffffffff817cba92>] _raw_spin_lock+0x32/0x80
[37825.813889] RSP: 0018:ffff8800aa2fbdc8  EFLAGS: 00000202
[37825.813891] RAX: 0000000000003346 RBX: ffff8800acb2a0d0 RCX: 0000000000000002
[37825.813894] RDX: 0000000000005600 RSI: 0000000000005602 RDI: ffffc9001074d144
[37825.813896] RBP: ffff8800aa2fbdc8 R08: 0000000000005602 R09: 0000000000000000
[37825.813898] R10: 0000000000000000 R11: 0000000000000000 R12: dead000000100100
[37825.813900] R13: ffffffff8120a2f0 R14: ffff8800aa2fbc58 R15: ffff880000000000
[37825.813903] FS:  00007f2ee3f02980(0000) GS:ffff88013fc00000(0000) knlGS:0000000000000000
[37825.813906] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[37825.813908] CR2: fffff8a0021db080 CR3: 00000000aa0ee000 CR4: 00000000001027f0
[37825.813910] Stack:
[37825.813912]  ffff8800aa2fbe38 ffffffff810f0d4c ffffc9001074d140 ffffc9001074d144
[37825.813916]  ffffffff00000004 00007f2ee40dc000 ffff8800933dc000 0000000000000800
[37825.813920]  ffff880036176900 00007f2ee40dc800 0000000000000081 0000000000000000
[37825.813924] Call Trace:
[37825.813932]  [<ffffffff810f0d4c>] futex_wake+0x9c/0x140
[37825.813937]  [<ffffffff810f3a87>] do_futex+0x107/0x5d0
[37825.813943]  [<ffffffff81356cf2>] ? common_file_perm+0x42/0xf0
[37825.813947]  [<ffffffff810f3fc6>] SyS_futex+0x76/0x170
[37825.813953]  [<ffffffff811f5b9a>] ? SyS_write+0x6a/0xb0
[37825.813957]  [<ffffffff817cbe8d>] system_call_fastpath+0x16/0x1b
[37825.813959] Code: 89 e5 b8 00 00 02 00 f0 0f c1 07 89 c2 c1 ea 10 66 39 c2 75 04 5d c3 66 90 41 89 d0 0f b7 f2 b8 00 80 00 00 eb 0a 0f 1f 00 f3 90 <83> e8 01 74 35 0f b7 17 89 d1 44 31 c1 81 e1 fe ff 00 00 75 e9 



** Attachment added: "kern.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/556919/+attachment/4502386/+files/kern.log

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https://bugs.launchpad.net/bugs/556919

Title:
  BUG: soft lockup - CPU#1 stuck for 61s! [kvm:19760]; RIP:
  0010:[<ffffffffa0482ee0>]  [<ffffffffa0482ee0>]
  kvm_write_guest_time+0x180/0x1b0 [kvm]

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Happening sInce some time after beta1 (I stopped running KVM for a
  while after the beta1 tests were done). Running kvm (via testdrive)
  against the ISOs.

  Almost always my laptop will hard-freeze. The screen is still painted
  under X, but no keys work. I cannot shift to a vTerm, and cannot use
  the magic keys to release from X. SSHing from another system fails (no
  route/response to/from host). Already established SSH sessions will
  not respond.

  All in all, it really sounds like a back kernel panic. The only option
  is to cycle power, wait for fsck to finish, and start again.

  On the few times I do not get a hard-freeze, a running KVM will
  suddenly display on the terminal header "QEMU stopped". After that,
  ending this KVM run and starting a new one will have KVM unable to
  recognise the guest vdisk (just-created/formatted). Rebooting returns
  KVM to work -- until the hard-freeze.

  This has happened today about 20 times. I have been unable to find
  anything in the logs pointing to an error, so far. Will now boot the
  -16 and -18 kernels to see if it is reproducible there; will also try
  a vanilla kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-19-generic 2.6.32-19.28
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
  Uname: Linux 2.6.32-19-generic x86_64
  AlsaVersion:
   Advanced Linux Sound Architecture Driver Version 1.0.22.1.
   Compiled on Apr  1 2010 for kernel 2.6.32-19-generic (SMP).
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  cerdea     3476 F.... pulseaudio
   /dev/snd/controlC0:  cerdea     3476 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfebfc000 irq 16'
     Mixer name	: 'SigmaTel STAC9205'
     Components	: 'HDA:838476a0,102801fd,00100204 HDA:14f12c06,14f1000f,00100000'
     Controls      : 19
     Simple ctrls  : 11
  Card1.Amixer.info:
   Card hw:1 'Pro'/'Creative Labs VF0400 Live! Cam Notebook Pro at usb-0000:00:13.4-1, full speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USB041e:4061'
     Controls      : 0
     Simple ctrls  : 0
  Card1.Amixer.values:

  CheckboxSubmission: 23f39d583e289591efa3692115f3f5f2
  CheckboxSystem: d00f84de8a555815fa1c4660280da308
  Date: Tue Apr  6 18:06:40 2010
  EcryptfsInUse: Yes
  Frequency: multiple times per day.
  HibernationDevice: RESUME=UUID=4212d0ae-0265-44ed-ac84-7b7cd5669fe4
  MachineType: Dell Inc. Inspiron 1721
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-19-generic root=/dev/mapper/sys-root ro crashkernel=384M-2G:64M,2G-:128M console=tty1 security=apparmor vbe_mode=0x176
  ProcEnviron:
   LC_TIME=en_DK.utf8
   PATH=(custom, no user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.33
  SourcePackage: linux
  dmi.bios.date: 04/21/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0RT951
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd04/21/2008:svnDellInc.:pnInspiron1721:pvr:rvnDellInc.:rn0RT951:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Inspiron 1721
  dmi.sys.vendor: Dell Inc.

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