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[Launchpad Bug Tracker <1456952@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.19.0-23.24

---------------
linux (3.19.0-23.24) vivid; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1472346

  [ Chris J Arges ]

  * SAUCE: Don't use atomic read in evlist.c
    - LP: #1410673

linux (3.19.0-23.23) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1472048

  [ Chris J Arges ]

  * [Config] Add CRYPTO_DEV_NX_*, 842_* as modules
    - LP: #1454687

  [ Lu, Han ]

  * SAUCE: i915_bpo: drm/i915/audio: add codec wakeup override
    enabled/disable callback
    - LP: #1460674

  [ Timo Aaltonen ]

  * SAUCE: Backport I915_OVERLAY_DISABLE_DEST_COLORKEY
    - LP: #1460674
  * SAUCE: i915_bpo: Rebase to drm-intel-next-fixes-2015-05-29
    - LP: #1460674
  * SAUCE: i915_bpo: Revert "drm/i915: Implement the intel_dp_autotest_edid
    function for DP EDID complaince tests"
    - LP: #1460674
  * SAUCE: i915_bpo: Revert "drm/i915: Add debugfs test control files for
    Displayport compliance testing"
    - LP: #1460674
  * SAUCE: Load i915_bpo from the hda driver on SKL/CHV
    - LP: #1460674
  * SAUCE: i915_bpo: Don't try to support BXT
    - LP: #1460674
  * SAUCE: i915_bpo: drm/i915/skl: Fix DMC API version.

  [ Upstream Kernel Changes ]

  * Revert "usb: dwc2: add bus suspend/resume for dwc2"
    - LP: #1471252
  * Revert "HID: logitech-hidpp: support combo keyboard touchpad TK820"
    - LP: #1471252
  * Revert "KVM: x86: drop fpu_activate hook"
    - LP: #1471252
  * Revert "libceph: clear r_req_lru_item in __unregister_linger_request()"
    - LP: #1471252
  * drm/i915: add component support
    - LP: #1460661
  * ALSA: hda: export struct hda_intel
    - LP: #1460661
  * ALSA: hda: pass intel_hda to all i915 interface functions
    - LP: #1460661
  * ALSA: hda: add component support
    - LP: #1460661
  * drm/atomic-helpers: Fix documentation typos and wrong copy&paste
    - LP: #1460674
  * drm/atomic: Rename drm_atomic_helper_commit_pre_planes() state argument
    - LP: #1460674
  * drm/atomic-helper: Rename commmit_post/pre_planes
    - LP: #1460674
  * drm/atomic-helpers: make mode_set hooks optional
    - LP: #1460674
  * drm/atomic-helper: Fix kerneldoc for prepare_planes
    - LP: #1460674
  * drm: Complete moving rotation property to core
    - LP: #1460674
  * drm: Share plane pixel format check code between legacy and atomic
    - LP: #1460674
  * drm/atomic: Constify a bunch of functions pointer structs
    - LP: #1460674
  * drm: Fix some typo mistake of the annotations
    - LP: #1460674
  * drm: change connector to tmp_connector
    - LP: #1460674
  * drm: atomic: Expose CRTC active property
    - LP: #1460674
  * drm: atomic: Allow setting CRTC active property
    - LP: #1460674
  * drm/atomic-helpers: Properly avoid full modeset dance
    - LP: #1460674
  * drm/atomic: Add helpers for state-subclassing drivers
    - LP: #1460674
  * drm: Fix some typos
    - LP: #1460674
  * drm/atomic: Add for_each_{connector,crtc,plane}_in_state helper macros
    - LP: #1460674
  * drm/atomic-helper: Don't call atomic_update_plane when it stays off
    - LP: #1460674
  * drm/atomic-helper: Really recover pre-atomic plane/cursor behavior
    - LP: #1460674
  * drm/atomic: Make mode_fixup() optional for check_modeset()
    - LP: #1460674
  * drm/atomic-helpers: Update vblank timestamping constants
    - LP: #1460674
  * drm/atomic-helpers: Export
    drm_atomic_helper_update_legacy_modeset_state
    - LP: #1460674
  * drm/atomic: add drm_atomic_get_existing_*_state helpers
    - LP: #1460674
  * drm/atomic: remove duplicated assignment of old_plane_state
    - LP: #1460674
  * drm/atomic: Allow drivers to subclass drm_atomic_state, v3
    - LP: #1460674
  * drm/dp: indentation and ordering cleanups
    - LP: #1460674
  * drm/dp: add DPCD definitions from eDP 1.2
    - LP: #1460674
  * drm/dp: add DPCD definitions from DP 1.1 and 1.2a
    - LP: #1460674
  * drm/dp: add DPCD definitions from eDP 1.4
    - LP: #1460674
  * drm: Adding drm helper function drm_plane_from_index().
    - LP: #1460674
  * ALSA: hda - reset display codec when power on
    - LP: #1460674
  * drm/i915/audio: add codec wakeup override enabled/disable callback
    - LP: #1460674
  * scsi: storvsc: Increase the ring buffer size
    - LP: #1445195
  * scsi: storvsc: Size the queue depth based on the ringbuffer size
    - LP: #1445195
  * scsi: storvsc: Always send on the selected outgoing channel
    - LP: #1445195
  * scsi: storvsc: Retrieve information about the capability of the target
    - LP: #1445195
  * scsi: storvsc: Don't assume that the scatterlist is not chained
    - LP: #1445195
  * scsi: storvsc: Set the tablesize based on the information given by the
    host
    - LP: #1445195
  * Drivers: hv: vmbus: Add support for VMBus panic notifier handler
    - LP: #1463584
  * Drivers: hv: vmbus: Correcting truncation error for constant
    HV_CRASH_CTL_CRASH_NOTIFY
    - LP: #1463584
  * net: eth: xgene: change APM X-Gene SoC platform ethernet to support
    ACPI
    - LP: #1458042
  * net: eth: xgene: devm_ioremap() returns NULL on error
    - LP: #1458042
  * drivers: net: xgene: Make xgene_enet_of_match depend on CONFIG_OF
    - LP: #1458042
  * Documentation: dts: Update compatible field description for APM X-Gene
    - LP: #1458042
  * dtb: change binding name to match with newer firmware DT
    - LP: #1458042
  * drivers: net: xgene: fix new firmware backward compatibility with older
    driver
    - LP: #1458042
  * net: eth: xgene: fix booting with devicetree
    - LP: #1458042
  * drivers: net: xgene: constify of_device_id array
    - LP: #1458042
  * Documentation: dtb: Add port-id field for APM X-Gene ethernet
    - LP: #1458042
  * dtb: xgene: Add second SGMII based 1G interface node
    - LP: #1458042
  * drivers: net: xgene: Add second SGMII based 1G interface
    - LP: #1458042
  * x86/fpu: Disable XSAVES* support for now
    - LP: #1468797
  * powerpc: export of_get_ibm_chip_id function
    - LP: #1454687
  * powerpc: Add ICSWX instruction
    - LP: #1454687
  * lib: add software 842 compression/decompression
    - LP: #1454687
  * crypto: 842 - change 842 alg to use software
    - LP: #1454687
  * crypto: nx - rename nx-842.c to nx-842-pseries.c
    - LP: #1454687
  * crypto: nx - add NX-842 platform frontend driver
    - LP: #1454687
  * crypto: nx - add nx842 constraints
    - LP: #1454687
  * crypto: nx - add PowerNV platform NX-842 driver
    - LP: #1454687
  * crypto: nx - simplify pSeries nx842 driver
    - LP: #1454687
  * crypto: nx - add hardware 842 crypto comp alg
    - LP: #1454687
  * lib: make lib/842 decompress functions static
    - LP: #1454687
  * lib: correct 842 decompress for 32 bit
    - LP: #1454687
  * crypto: nx - remove 842-nx null checks
    - LP: #1454687
  * crypto: nx - prevent nx 842 load if no hw driver
    - LP: #1454687
  * crypto: nx - fix nx-842 pSeries driver minimum buffer size
    - LP: #1454687
  * crypto: nx - move include/linux/nx842.h into drivers/crypto/nx/nx-842.h
    - LP: #1454687
  * crypto: nx - replace NX842_MEM_COMPRESS with function
    - LP: #1454687
  * crypto: nx - add LE support to pSeries platform driver
    - LP: #1454687
  * net/mlx4_en: Disbale GRO for incoming loopback/selftest packets
    - LP: #1432848
  * mm/slab_common: support the slub_debug boot option on specific object
    size
    - LP: #1456952
  * perf trace: Fix race condition at the end of started workloads
    - LP: #1410673
  * kvm: x86: fix kvm_apic_has_events to check for NULL pointer
  * cpuidle: powernv/pseries: Auto-promotion of snooze to deeper idle state
    - LP: #1470404
  * IB/ipoib: change init sequence ordering
    - LP: #1467912
  * IB/ipoib: factor out ah flushing
    - LP: #1467912
  * HID: add ALWAYS_POLL quirk for a Logitech 0xc007
    - LP: #1471252
  * HID: add HP OEM mouse to quirk ALWAYS_POLL
    - LP: #1471252
  * HID: add quirk for PIXART OEM mouse used by HP
    - LP: #1471252
  * usb: dwc2: hcd: use new USB_RESUME_TIMEOUT
    - LP: #1471252
  * usb: isp1760: hcd: use new USB_RESUME_TIMEOUT
    - LP: #1471252
  * nfsd: fix nsfd startup race triggering BUG_ON
    - LP: #1471252
  * jhash: Update jhash_[321]words functions to use correct initval
    - LP: #1471252
  * firmware/ihex2fw.c: restore missing default in switch statement
    - LP: #1471252
  * bridge/mdb: remove wrong use of NLM_F_MULTI
    - LP: #1471252
  * iio/axp288_adc: add missing channel info mask
    - LP: #1471252
  * iio: light: hid-sensor-prox: Fix modifier
    - LP: #1471252
  * iio: pressure: hid-sensor-press: Fix modifier
    - LP: #1471252
  * iio: adc: xilinx: Fix register addresses
    - LP: #1471252
  * iio: adc: xilinx: Fix "vccaux" channel .address
    - LP: #1471252
  * iio: adc: xilinx: Fix VREFP scale
    - LP: #1471252
  * iio: adc: xilinx: Fix VREFN sign
    - LP: #1471252
  * libata: Add helper to determine when PHY events should be ignored
    - LP: #1471252
  * libata: Ignore spurious PHY event on LPM policy change
    - LP: #1471252
  * iio:st_sensors: Fix oops when probing SPI devices
    - LP: #1471252
  * usb: gadget: configfs: Fix interfaces array NULL-termination
    - LP: #1471252
  * rtlwifi: rtl8192cu: Fix kernel deadlock
    - LP: #1471252
  * USB: cp210x: add ID for KCF Technologies PRN device
    - LP: #1471252
  * USB: pl2303: Remove support for Samsung I330
    - LP: #1471252
  * USB: visor: Match I330 phone more precisely
    - LP: #1471252
  * net: can: xilinx_can: fix extended frame handling
    - LP: #1471252
  * nfsd: fix the check for confirmed openowner in
    nfs4_preprocess_stateid_op
    - LP: #1471252
  * svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures
    - LP: #1471252
  * ACPI / init: Fix the ordering of acpi_reserve_resources()
    - LP: #1471252
  * md/raid5: don't record new size if resize_stripes fails.
    - LP: #1471252
  * sched: Handle priority boosted tasks proper in setscheduler()
    - LP: #1471252
  * staging: vt6656: use ieee80211_tx_info to select packet type.
    - LP: #1471252
  * staging: vt6655: device_free_tx_buf use only
    ieee80211_tx_status_irqsafe
    - LP: #1471252
  * staging: vt6655: Fix 80211 control and management status reporting.
    - LP: #1471252
  * staging: vt6655: lock MACvWriteBSSIDAddress.
    - LP: #1471252
  * arm64: bpf: fix signedness bug in loading 64-bit immediate
    - LP: #1471252
  * xhci: fix isoc endpoint dequeue from advancing too far on transaction
    error
    - LP: #1471252
  * xhci: Solve full event ring by increasing TRBS_PER_SEGMENT to 256
    - LP: #1471252
  * xhci: gracefully handle xhci_irq dead device
    - LP: #1471252
  * ARC: unbork !LLSC build
    - LP: #1471252
  * staging: gdm724x: Correction of variable usage after applying ALIGN()
    - LP: #1471252
  * usb-storage: Add NO_WP_DETECT quirk for Lacie 059f:0651 devices
    - LP: #1471252
  * tty/n_gsm.c: fix a memory leak when gsmtty is removed
    - LP: #1471252
  * pty: Fix input race when closing
    - LP: #1429756, #1471252
  * ARM: net fix emit_udiv() for BPF_ALU | BPF_DIV | BPF_K intruction.
    - LP: #1471252
  * x86/vdso: Fix the x86 vdso2c tool includes
    - LP: #1471252
  * x86/vdso: Fix 'make bzImage' on older distros
    - LP: #1471252
  * perf/x86/rapl: Enable Broadwell-U RAPL support
    - LP: #1471252
  * net: qca_spi: Fix possible race during probe
    - LP: #1471252
  * drm/radeon: fix VM_CONTEXT*_PAGE_TABLE_END_ADDR handling
    - LP: #1471252
  * RDMA/core: Fix for parsing netlink string attribute
    - LP: #1471252
  * drm/radeon: add new bonaire pci id
    - LP: #1471252
  * parisc,metag: Fix crashes due to stack randomization on
    stack-grows-upwards architectures
    - LP: #1471252
  * net: phy: micrel: Fix regression in kszphy_probe
    - LP: #1471252
  * firmware: dmi_scan: Fix ordering of product_uuid
    - LP: #1471252
  * ext4: fix NULL pointer dereference when journal restart fails
    - LP: #1471252
  * ext4: check for zero length extent explicitly
    - LP: #1471252
  * jbd2: fix r_count overflows leading to buffer overflow in journal
    recovery
    - LP: #1471252
  * tools/vm: fix page-flags build
    - LP: #1471252
  * mm, numa: really disable NUMA balancing by default on single node
    machines
    - LP: #1471252
  * igb: Fix oops on changing number of rings
    - LP: #1471252
  * power/reset: at91: fix return value check in
    at91_reset_platform_probe()
    - LP: #1471252
  * spi: bitbang: Make setup_transfer() callback optional
    - LP: #1471252
  * iwlwifi: pcie: prevent using unmapped memory in fw monitor
    - LP: #1471252
  * x86: bpf_jit: fix FROM_BE16 and FROM_LE16/32 instructions
    - LP: #1471252
  * igb: Fix NULL assignment to incorrect variable in igb_reset_q_vector
    - LP: #1471252
  * thermal: rockchip: fix an error code
    - LP: #1471252
  * ARM: net: delegate filter to kernel interpreter when imm_offset()
    return value can't fit into 12bits.
    - LP: #1471252
  * ALSA: hda - Add headphone quirk for Lifebook E752
    - LP: #1471252
  * ASoC: mc13783: Fix wrong mask value used in mc13xxx_reg_rmw() calls
    - LP: #1471252
  * ASoC: uda1380: Avoid accessing i2c bus when codec is disabled
    - LP: #1471252
  * clk: exynos5420: Restore GATE_BUS_TOP on suspend
    - LP: #1471252
  * thermal: armada: Update Armada 380 thermal sensor coefficients
    - LP: #1471252
  * ALSA: hda/realtek - Support Dell headset mode for ALC256
    - LP: #1471252
  * ALSA: hda - fix headset mic detection problem for one more machine
    - LP: #1447909, #1471252
  * ALSA: hda - Add headset mic quirk for Dell Inspiron 5548
    - LP: #1452175, #1471252
  * mac80211: move WEP tailroom size check
    - LP: #1471252
  * KVM: MMU: fix smap permission check
    - LP: #1471252
  * KVM: MMU: fix CR4.SMEP=1, CR0.WP=0 with shadow pages
    - LP: #1471252
  * KVM: MMU: fix SMAP virtualization
    - LP: #1471252
  * powerpc/mce: fix off by one errors in mce event handling
    - LP: #1471252
  * ASoC: dapm: Modify widget stream name according to prefix
    - LP: #1471252
  * ASoC: wm8960: fix "RINPUT3" audio route error
    - LP: #1471252
  * ASoC: wm8994: correct BCLK DIV 348 to 384
    - LP: #1471252
  * ktime: Optimize ktime_divns for constant divisors
    - LP: #1471252
  * ktime: Fix ktime_divns to do signed division
    - LP: #1471252
  * Input: elantech - fix semi-mt protocol for v3 HW
    - LP: #1471252
  * powerpc: Align TOC to 256 bytes
    - LP: #1471252
  * ALSA: hda - Add Conexant codecs CX20721, CX20722, CX20723 and CX20724
    - LP: #1454656, #1471252
  * ALSA: hda/realtek - ALC292 dock fix for Thinkpad L450
    - LP: #1471252
  * mmc: atmel-mci: fix bad variable type for clkdiv
    - LP: #1471252
  * sd: Disable support for 256 byte/sector disks
    - LP: #1471252
  * s390/mm: correct return value of pmd_pfn
    - LP: #1471252
  * xen/events: don't bind non-percpu VIRQs with percpu chip
    - LP: #1471252
  * kvm: fix crash in kvm_vcpu_reload_apic_access_page
    - LP: #1471252
  * kvm/fpu: Enable eager restore kvm FPU for MPX
    - LP: #1471252
  * libceph: request a new osdmap if lingering request maps to no osd
    - LP: #1471252
  * drm/radeon: retry dcpd fetch
    - LP: #1471252
  * crypto: s390/ghash - Fix incorrect ghash icv buffer handling.
    - LP: #1471252
  * ipvs: fix memory leak in ip_vs_ctl.c
    - LP: #1471252
  * rtnl/bond: don't send rtnl msg for unregistered iface
    - LP: #1471252
  * net: sched: fix call_rcu() race on classifier module unloads
    - LP: #1471252
  * conntrack: RFC5961 challenge ACK confuse conntrack LAST-ACK transition
    - LP: #1471252
  * net: phy: Allow EEE for all RGMII variants
    - LP: #1471252
  * bridge: fix parsing of MLDv2 reports
    - LP: #1471252
  * cdc_ncm: Fix tx_bytes statistics
    - LP: #1471252
  * ipv4: Avoid crashing in ip_error
    - LP: #1471252
  * ipv6: do not delete previously existing ECMP routes if add fails
    - LP: #1471252
  * net/ipv6/udp: Fix ipv6 multicast socket filter regression
    - LP: #1471252
  * ipv6: fix ECMP route replacement
    - LP: #1471252
  * tcp/ipv6: fix flow label setting in TIME_WAIT state
    - LP: #1471252
  * staging: vt6655: move setting of PSTxDesc->buff_addr to vnt_tx_packet
    - LP: #1471252
  * staging: vt6655: Fix TD_FLAGS_NETIF_SKB only on TYPE_AC0DMA
    - LP: #1471252
  * staging: vt6655: vnt_tx_packet fix dma_idx selection.
    - LP: #1471252
  * staging: vt6655: vnt_tx_packet Correct TX order of OWNED_BY_NIC
    - LP: #1471252
  * staging: vt6655: [BUG] Protect MACvSelectPage1 with lock.
    - LP: #1471252
  * net: core: Correct an over-stringent device loop detection.
    - LP: #1471252
  * x86: bpf_jit: fix compilation of large bpf programs
    - LP: #1471252
  * net: dp83640: fix broken calibration routine.
    - LP: #1471252
  * net: dp83640: reinforce locking rules.
    - LP: #1471252
  * net: dp83640: fix improper double spin locking.
    - LP: #1471252
  * unix/caif: sk_socket can disappear when state is unlocked
    - LP: #1471252
  * xen/netback: Properly initialize credit_bytes
    - LP: #1471252
  * net_sched: invoke ->attach() after setting dev->qdisc
    - LP: #1471252
  * sctp: Fix mangled IPv4 addresses on a IPv6 listening socket
    - LP: #1471252
  * bridge: fix br_multicast_query_expired() bug
    - LP: #1471252
  * udp: fix behavior of wrong checksums
    - LP: #1471252
  * xen: netback: read hotplug script once at start of day.
    - LP: #1471252
  * ipv4/udp: Verify multicast group is ours in upd_v4_early_demux()
    - LP: #1471252
  * bridge: disable softirqs around br_fdb_update to avoid lockup
    - LP: #1471252
  * tcp: fix child sockets to use system default congestion control if not
    set
    - LP: #1471252
  * be2net: Replace dma/pci_alloc_coherent() calls with
    dma_zalloc_coherent()
    - LP: #1471252
  * drm/radeon: partially revert "fix VM_CONTEXT*_PAGE_TABLE_END_ADDR
    handling"
    - LP: #1471252
  * Linux 3.19.8-ckt2
    - LP: #1471252

 -- Luis Henriques <luis.henriques@xxxxxxxxxxxxx>  Tue, 07 Jul 2015
18:15:10 +0100

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

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

-- 
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https://bugs.launchpad.net/bugs/1456952

Title:
  support the slub_debug boot option on specific object size

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Released
Status in linux source package in Vivid:
  Fix Released

Bug description:
  [Impact]

  slub_debug cannot work for specific kmem_cache size.

  e. g. slub_debug=PU,kmalloc-1024

  The slub_debug is used to enable the debugging of use-after-free, poison
  overwritten, double free. And it also increases the up time of the server
  when the above mentioned errors happen instead of crashing immediately.

  However, currently, there exists bug that the slub_debug cannot be applied
  for the specific object size. This is not helpful to enable the whole
  system slub_debug because the performance loss will be up to 20%~30%
  according to the customer's measurement. The patch here to limit the
  slub_debug only on the specific object size to alleviate the performance
  loss.

  [Fix]

  The slub_debug=PU,kmalloc-xx cannot work because in the
  create_kmalloc_caches() the s->name is created after the
  create_kmalloc_cache() is called.  The name is NULL in the
  create_kmalloc_cache() so the kmem_cache_flags() would not set the
  slub_debug flags to the s->flags.  The fix here set up a kmalloc_names
  string array for the initialization purpose and delete the dynamic name
  creation of kmalloc_caches.

  [Test case]

  Install the patched kernel.
  sudo reboot

  sudo vim /etc/default/grub
  append "slub_debug=FPZU,kmalloc-1024" to GRUB_CMDLINE_LINUX_DEFAULT
  sudo update-grub
  sudo reboot

  # Check if the kmalloc-1024 debug options are enabled
  sudo cat /sys/kernel/slab/kmalloc-1024/sanity_checks
  # shoulb be 1
  sudo cat /sys/kernel/slab/kmalloc-1024/red_zone
  # shoulb be 1
  sudo cat /sys/kernel/slab/kmalloc-1024/poison
  # shoulb be 1

  # Check other object size
  sudo cat /sys/kernel/slab/kmalloc-8/sanity_checks
  # shoulb be 0
  sudo cat /sys/kernel/slab/kmalloc-8/red_zone
  # shoulb be 0
  sudo cat /sys/kernel/slab/kmalloc-8/poison
  # shoulb be 0

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