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[Launchpad Bug Tracker <1088433@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.5.0-49.73

---------------
linux (3.5.0-49.73) quantal; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1300894

  [ Kamal Mostafa ]

  * [config] updateconfigs after Linux 3.5.7.32 stable update

  [ Upstream Kernel Changes ]

  * ata: enable quirk from jmicron JMB350 for JMB394
    - LP: #1295768
  * sata_sil: apply MOD15WRITE quirk to TOSHIBA MK2561GSYN
    - LP: #1295768
  * ARM: 7953/1: mm: ensure TLB invalidation is complete before enabling
    MMU
    - LP: #1295768
  * x86: dma-mapping: fix GFP_ATOMIC macro usage
    - LP: #1295768
  * SUNRPC: Fix races in xs_nospace()
    - LP: #1295768
  * ext4: don't try to modify s_flags if the the file system is read-only
    - LP: #1295768
  * drm/i915/dp: increase native aux defer retry timeout
    - LP: #1295768
  * drm/i915/dp: add native aux defer retry limit
    - LP: #1295768
  * rtlwifi: rtl8192ce: Fix too long disable of IRQs
    - LP: #1295768
  * rtlwifi: Fix incorrect return from rtl_ps_enable_nic()
    - LP: #1295768
  * rtl8187: fix regression on MIPS without coherent DMA
    - LP: #1295768
  * PCI: Enable INTx if BIOS left them disabled
    - LP: #1295768
  * cifs: ensure that uncached writes handle unmapped areas correctly
    - LP: #1295768
  * ext4: fix online resize with a non-standard blocks per group setting
    - LP: #1295768
  * ext4: don't leave i_crtime.tv_sec uninitialized
    - LP: #1295768
  * ALSA: usb-audio: work around KEF X300A firmware bug
    - LP: #1295768
  * avr32: fix missing module.h causing build failure in mimc200/fram.c
    - LP: #1295768
  * avr32: Makefile: add '-D__linux__' flag for gcc-4.4.7 use
    - LP: #1295768
  * ARM: 7957/1: add DSB after icache flush in __flush_icache_all()
    - LP: #1295768
  * ahci: disable NCQ on Samsung pci-e SSDs on macbooks
    - LP: #1295768
  * USB: serial: option: blacklist interface 4 for Cinterion PHS8 and PXS8
    - LP: #1295768
  * workqueue: ensure @task is valid across kthread_stop()
    - LP: #1295768
  * cgroup: update cgroup_enable_task_cg_lists() to grab siglock
    - LP: #1295768
  * hwmon: (max1668) Fix writing the minimum temperature
    - LP: #1295768
  * cpufreq: powernow-k8: Initialize per-cpu data-structures properly
    - LP: #1295768
  * ACPI / video: Filter the _BCL table for duplicate brightness values
    - LP: #1295768
  * perf tools: Remove extraneous newline when parsing hardware cache
    events
    - LP: #1295768
  * perf tools: Fix cache event name generation
    - LP: #1295768
  * net: fix 'ip rule' iif/oif device rename
    - LP: #1295768
  * tg3: Fix deadlock in tg3_change_mtu()
    - LP: #1295768
  * bonding: 802.3ad: make aggregator_identifier bond-private
    - LP: #1295768
  * usbnet: remove generic hard_header_len check
    - LP: #1295768
  * net: sctp: fix sctp_connectx abi for ia32 emulation/compat mode
    - LP: #1295768
  * net: add and use skb_gso_transport_seglen()
    - LP: #1295768
  * net: ip, ipv6: handle gso skbs in forwarding path
    - LP: #1295768
  * net: asix: handle packets crossing URB boundaries
    - LP: #1295768
  * net: asix: add missing flag to struct driver_info
    - LP: #1295768
  * fs/proc/proc_devtree.c: remove empty /proc/device-tree when no
    openfirmware exists.
    - LP: #1295768
  * Input: elantech -  improve clickpad detection
    - LP: #1295768
  * KVM: MMU: handle invalid root_hpa at __direct_map
    - LP: #1295768
  * KVM: VMX: fix use after free of vmx->loaded_vmcs
    - LP: #1295768
  * e100: Fix "disabling already-disabled device" warning
    - LP: #1295768
  * dma: ste_dma40: don't dereference free:d descriptor
    - LP: #1295768
  * ASoC: sta32x: Fix array access overflow
    - LP: #1295768
  * ASoC: wm8770: Fix wrong number of enum items
    - LP: #1295768
  * SELinux: bigendian problems with filename trans rules
    - LP: #1295768
  * quota: Fix race between dqput() and dquot_scan_active()
    - LP: #1295768
  * qla2xxx: Fix kernel panic on selective retransmission request
    - LP: #1295768
  * ASoC: wm8958-dsp: Fix firmware block loading
    - LP: #1295768
  * i7core_edac: Fix PCI device reference count
    - LP: #1295768
  * i7300_edac: Fix device reference count
    - LP: #1295768
  * ipc,mqueue: remove limits for the amount of system-wide queues
    - LP: #1295768
  * dm mpath: fix stalls when handling invalid ioctls
    - LP: #1295768
  * ACPI / processor: Rework processor throttling with work_on_cpu()
    - LP: #1295768
  * USB: ftdi_sio: add Cressi Leonardo PID
    - LP: #1295768
  * usb: ehci: fix deadlock when threadirqs option is used
    - LP: #1295768
  * ASoC: sta32x: Fix wrong enum for limiter2 release rate
    - LP: #1295768
  * perf/x86: Fix event scheduling
    - LP: #1295768
  * perf: Fix hotplug splat
    - LP: #1295768
  * kvm: x86: fix emulator buffer overflow (CVE-2014-0049)
    - LP: #1295768
  * powerpc/crashdump : Fix page frame number check in copy_oldmem_page
    - LP: #1295768
  * Linux 3.5.7.32
    - LP: #1295768
  * module: do percpu allocation after uniqueness check. No, really!
    - LP: #1088433
  * ioat: fix tasklet tear down
    - LP: #1291113
 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>   Tue, 01 Apr 2014 10:27:11 -0700

** Changed in: linux (Ubuntu Quantal)
       Status: In Progress => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2014-0049

** Changed in: linux (Ubuntu Quantal)
       Status: In Progress => Fix Released

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1088433

Title:
  PERCPU: allocation failed when loading module kvm

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Quantal:
  Fix Released
Status in “linux” source package in Raring:
  Fix Released

Bug description:
  SRU Justification:
  Impact: When using VMs with many CPUs on kvm, the module is loaded per CPU which can cause allocation failures.

  Fix: 8d8022e8aba85192e937f1f0f7450e256d66ae5c solves the issue which
  is present in 3.8 series and beyond.

  Testcase: Boot a VM with many CPUs, reboot and check if issue occurs.

  --

  The kernel tries to load the KVM module for each CPU even though it
  really only needs to be loaded once. For each subsequent load, the
  kernel is trying to allocate the per-cpu area before it checks if the
  module is loaded already. This can result in the following backtrace:

  [    8.294573] PERCPU: allocation failed, size=304 align=32, alloc from reserved chunk failed
  [    8.294578] Pid: 1490, comm: modprobe Not tainted 3.5.0-20-generic #31-Ubuntu
  [    8.294579] Call Trace:
  [    8.294597]  [<ffffffff81143924>] pcpu_alloc+0x974/0x9d0
  [    8.294604]  [<ffffffff810b185a>] ? each_symbol_section+0x2a/0x70
  [    8.294607]  [<ffffffff810b18d1>] ? find_symbol+0x31/0x70
  [    8.294610]  [<ffffffff81143c43>] __alloc_reserved_percpu+0x13/0x20
  [    8.294613]  [<ffffffff810b413a>] layout_and_allocate+0x2fa/0xaf0
  [    8.294615]  [<ffffffff810b4a29>] load_module+0xf9/0x1170
  [    8.294630]  [<ffffffff810b5af2>] sys_init_module+0x52/0x230
  [    8.294640]  [<ffffffff8168b969>] system_call_fastpath+0x16/0x1b
  [    8.294642] kvm: Could not allocate 304 bytes percpu data

  Reproduced with kernel from quantal-release and quantal-proposed

  I found this reference on LKML:

  https://lkml.org/lkml/2012/10/11/198

  The following patch solves the issue:
  8d8022e8aba85192e937f1f0f7450e256d66ae5c
  This is in 3.8/3.11
  https://lkml.org/lkml/2013/7/11/545

  -

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-20-generic 3.5.0-20.31
  ProcVersionSignature: Ubuntu 3.5.0-20.31-generic 3.5.7.1
  Uname: Linux 3.5.0-20-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 Dec 10 10:54 seq
   crw-rw---T 1 root audio 116, 33 Dec 10 10:54 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Mon Dec 10 11:03:33 2012
  HibernationDevice: RESUME=UUID=c595dd75-dab5-4fcd-a089-302addcaef96
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: Intel Corporation LH Pass
  MarkForUpload: True
  PciMultimedia:

  ProcEnviron:
   LANGUAGE=en_US:
   TERM=screen-bce
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-20-generic root=UUID=58f9a800-2e0c-4da5-9d94-c4bb4bed4fa2 ro quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-20-generic N/A
   linux-backports-modules-3.5.0-20-generic  N/A
   linux-firmware                            1.95
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/30/2012
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: SE5C600.86B.99.99.2050.043020121425
  dmi.board.asset.tag: ....................
  dmi.board.name: S4600LH....
  dmi.board.vendor: Intel Corporation
  dmi.board.version: ..........
  dmi.chassis.asset.tag: ....................
  dmi.chassis.type: 23
  dmi.chassis.vendor: ...............................
  dmi.chassis.version: ..................
  dmi.modalias: dmi:bvnIntelCorp.:bvrSE5C600.86B.99.99.2050.043020121425:bd04/30/2012:svnIntelCorporation:pnLHPass:pvr....................:rvnIntelCorporation:rnS4600LH....:rvr..........:cvn...............................:ct23:cvr..................:
  dmi.product.name: LH Pass
  dmi.product.version: ....................
  dmi.sys.vendor: Intel Corporation

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