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[Mike Pontillo <mike.pontillo@xxxxxxxxxxxxx>]

Also, the hypervisor's /proc/cpuinfo reports the following CPU
configuration (8 cores of the same):

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 60
model name	: Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
stepping	: 3
microcode	: 0x1e
cpu MHz		: 2500.097
cache size	: 6144 KB
physical id	: 0
siblings	: 8
core id		: 0
cpu cores	: 4
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 13
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm ida arat epb pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt
bugs		:
bogomips	: 4988.49
clflush size	: 64
cache_alignment	: 64
address sizes	: 39 bits physical, 48 bits virtual
power management:

And the hypervisor's kernel is version 4.2.0-19-generic.

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https://bugs.launchpad.net/bugs/1524069

Title:
  Xenial KVM: updating Trusty guest from 3.13.0-68 to 3.13.0-71 causes
  kernel exception

Status in linux package in Ubuntu:
  New

Bug description:
  The symptom I saw was this (note the segfault, and apt-get upgrade
  hangs after this):

  Setting up linux-image-3.13.0-71-generic (3.13.0-71.114) ...
  Running depmod.
  update-initramfs: deferring update (hook will be called later)
  Examining /etc/kernel/postinst.d.
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  update-initramfs: Generating /boot/initrd.img-3.13.0-71-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
  Found linux image: /boot/vmlinuz-3.13.0-71-generic
  Found initrd image: /boot/initrd.img-3.13.0-71-generic
  Found linux image: /boot/vmlinuz-3.13.0-68-generic
  Found initrd image: /boot/initrd.img-3.13.0-68-generic
  Segmentation fault
  done
  Setting up linux-firmware (1.127.19) ...
  Setting up linux-image-extra-3.13.0-71-generic (3.13.0-71.114) ...
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  update-initramfs: Generating /boot/initrd.img-3.13.0-71-generic
  run-parts: executing /etc/kernel/postinst.d/pm-utils 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.13.0-71-generic /boot/vmlinuz-3.13.0-71-generic
  Generating grub configuration file ...
  Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
  Found linux image: /boot/vmlinuz-3.13.0-71-generic
  Found initrd image: /boot/initrd.img-3.13.0-71-generic
  Found linux image: /boot/vmlinuz-3.13.0-68-generic
  Found initrd image: /boot/initrd.img-3.13.0-68-generic

  In dmesg, I saw a corresponding kernel stack trace:

  [  522.649091] SGI XFS with ACLs, security attributes, realtime, large block/inode numbers, no debug enabled
  [  522.654031] JFS: nTxBlock = 8192, nTxLock = 65536
  [  522.660515] NTFS driver 2.1.30 [Flags: R/O MODULE].
  [  522.672519] QNX4 filesystem 0.2.3 registered.
  [  522.677257] xor: measuring software checksum speed
  [  522.715613]    prefetch64-sse: 17306.000 MB/sec
  [  522.755589]    generic_sse: 16039.000 MB/sec
  [  522.755590] xor: using function: prefetch64-sse (17306.000 MB/sec)
  [  522.823619] raid6: sse2x1   10481 MB/s
  [  522.891614] raid6: sse2x2   13303 MB/s
  [  522.959616] raid6: sse2x4   15209 MB/s
  [  522.963634] invalid opcode: 0000 [#1] SMP 
  [  522.963645] Modules linked in: raid6_pq(+) xor ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp bridge stp llc ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables snd_hda_intel snd_hda_codec snd_hwdep qxl snd_pcm kvm_intel ttm snd_page_alloc kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel drm_kms_helper snd_timer aesni_intel snd aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd drm soundcore lp parport serio_raw i2c_piix4 mac_hid pata_acpi floppy psmouse
  [  522.963746] CPU: 2 PID: 11288 Comm: modprobe Not tainted 3.13.0-68-generic #111-Ubuntu
  [  522.963751] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
  [  522.963755] task: ffff880059363000 ti: ffff88005dec6000 task.ti: ffff88005dec6000
  [  522.963759] RIP: 0010:[<ffffffffa049dd0a>]  [<ffffffffa049dd0a>] raid6_avx21_gen_syndrome+0x4a/0x160 [raid6_pq]
  [  522.963767] RSP: 0018:ffff88005dec7c40  EFLAGS: 00010246
  [  522.963771] RAX: 0000000000000000 RBX: ffff88005dec7c88 RCX: ffff880059363000
  [  522.963774] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000012
  [  522.963778] RBP: ffff88005dec7c70 R08: 0000000000000086 R09: 000000000000025f
  [  522.963781] R10: 0000000000000000 R11: ffff88005dec79ae R12: 0000000000001000
  [  522.963785] R13: ffff880043a42000 R14: ffff880043a43000 R15: 0000000000000012
  [  522.963789] FS:  00007fa330823740(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
  [  522.963793] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  522.963796] CR2: 00007fa330623000 CR3: 0000000036acf000 CR4: 00000000001006e0
  [  522.963801] Stack:
  [  522.963803]  0000000000000080 ffffffffa049e238 ffffffffa04b0720 ffff880043a42000
  [  522.963810]  0000000000003cd7 000000010000d992 ffff88005dec7d40 ffffffffa00d20fb
  [  522.963817]  0000000000000000 ffffffffa04a0600 ffffffffa04a1600 ffffffffa04a2600
  [  522.963824] Call Trace:
  [  522.963838]  [<ffffffffa00d20fb>] init_module+0xfb/0x1000 [raid6_pq]
  [  522.963843]  [<ffffffffa00d2000>] ? 0xffffffffa00d1fff
  [  522.963849]  [<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
  [  522.963854]  [<ffffffff81059903>] ? set_memory_nx+0x43/0x50
  [  522.963859]  [<ffffffff810e29bd>] load_module+0x12dd/0x1b40
  [  522.963863]  [<ffffffff810de440>] ? store_uevent+0x40/0x40
  [  522.963868]  [<ffffffff810e3396>] SyS_finit_module+0x86/0xb0
  [  522.963873]  [<ffffffff81734cdd>] system_call_fastpath+0x1a/0x1f
  [  522.963876] Code: 00 00 00 00 53 48 89 d3 48 83 ec 08 48 89 75 d0 4c 8b 2c c2 4c 8b 74 32 08 e8 13 f9 b7 e0 84 c0 0f 84 f1 00 00 00 e8 c6 f9 b7 e0 <c5> fd 6f 05 ee 2a 01 00 c5 e5 ef db 4d 85 e4 0f 84 c0 00 00 00 
  [  522.963940] RIP  [<ffffffffa049dd0a>] raid6_avx21_gen_syndrome+0x4a/0x160 [raid6_pq]
  [  522.963946]  RSP <ffff88005dec7c40>
  [  522.963949] ---[ end trace 7324d498bc862f81 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-68-generic 3.13.0-68.111
  ProcVersionSignature: Ubuntu 3.13.0-68.111-generic 3.13.11-ckt27
  Uname: Linux 3.13.0-68-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-68-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Date: Tue Dec  8 13:08:13 2015
  HibernationDevice: RESUME=UUID=69fc2e53-278d-40ca-8109-64f826a073e7
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 qxldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-68-generic root=UUID=897d5dd8-599e-42f9-a081-96f73cef59d9 ro splash quiet vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-68-generic N/A
   linux-backports-modules-3.13.0-68-generic  N/A
   linux-firmware                             1.127.19
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-wily
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-wily:cvnQEMU:ct1:cvrpc-i440fx-wily:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-wily
  dmi.sys.vendor: QEMU

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