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[Launchpad Bug Tracker <1425576@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-58.97

---------------
linux (3.13.0-58.97) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1472453

  [ Upstream Kernel Changes ]

  * vm: Fix incomplete backport of VM_FAULT_SIGSEGV handling support
    - LP: #1471892

linux (3.13.0-58.96) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1471991

  [ Iyappan Subramanian ]

  * SAUCE: (no-up): drivers: net: xgene: fix: Out of order descriptor bytes
    read
    - LP: #1425576

  [ Upstream Kernel Changes ]

  * NVMe: Add shutdown timeout as module parameter.
    - LP: #1465136
  * 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
  * netfilter: nf_conntrack: don't release a conntrack with non-zero refcnt
    - LP: #1466135
  * lpfc: Add iotag memory barrier
    - LP: #1468416
  * mm/slab_common: support the slub_debug boot option on specific object
    size
    - LP: #1456952
  * pipe: iovec: Fix memory corruption when retrying atomic copy as
    non-atomic
    - CVE-2015-1805
  * kvm: x86: fix kvm_apic_has_events to check for NULL pointer
  * staging, rtl8192e, LLVMLinux: Change extern inline to static inline
    - LP: #1471233
  * kernel: use the gnu89 standard explicitly
    - LP: #1471233
  * staging, rtl8192e, LLVMLinux: Remove unused inline prototype
    - LP: #1471233
  * staging: rtl8712, rtl8712: avoid lots of build warnings
    - LP: #1471233
  * qla2xxx: remove redundant declaration in 'qla_gbl.h'
    - LP: #1471233
  * staging: wlags49_h2: fix extern inline functions
    - LP: #1471233
  * ARM: 8307/1: psci: move psci firmware calls out of line
    - LP: #1471233
  * kconfig: Fix warning "‘jump’ may be used uninitialized"
    - LP: #1471233
  * scripts/sortextable: suppress warning: `relocs_size' may be used
    uninitialized
    - LP: #1471233
  * ASoC: dapm: Enable autodisable on SOC_DAPM_SINGLE_TLV_AUTODISABLE
    - LP: #1471233
  * ALSA: hda - Fix mute-LED fixed mode
    - LP: #1471233
  * ALSA: emu10k1: Fix card shortname string buffer overflow
    - LP: #1471233
  * ALSA: emux: Fix mutex deadlock at unloading
    - LP: #1471233
  * drm/radeon: add SI DPM quirk for Sapphire R9 270 Dual-X 2G GDDR5
    - LP: #1471233
  * SCSI: add 1024 max sectors black list flag
    - LP: #1471233
  * 3w-sas: fix command completion race
    - LP: #1471233
  * 3w-xxxx: fix command completion race
    - LP: #1471233
  * 3w-9xxx: fix command completion race
    - LP: #1471233
  * serial: xilinx: Use platform_get_irq to get irq description structure
    - LP: #1471233
  * serial: of-serial: Remove device_type = "serial" registration
    - LP: #1471233
  * tty/serial: at91: maxburst was missing for dma transfers
    - LP: #1471233
  * ALSA: emux: Fix mutex deadlock in OSS emulation
    - LP: #1471233
  * ALSA: emu10k1: Emu10k2 32 bit DMA mode
    - LP: #1471233
  * rbd: end I/O the entire obj_request on error
    - LP: #1471233
  * powerpc/pseries: Correct cpu affinity for dlpar added cpus
    - LP: #1471233
  * bridge/mdb: remove wrong use of NLM_F_MULTI
    - LP: #1471233
  * efivarfs: Ensure VariableName is NUL-terminated
    - LP: #1471233
  * x86/efi: Store upper bits of command line buffer address in
    ext_cmd_line_ptr
    - LP: #1471233
  * writeback: use |1 instead of +1 to protect against div by zero
    - LP: #1471233
  * ARM: mvebu: armada-xp-openblocks-ax3-4: Disable internal RTC
    - LP: #1471233
  * ARM: dts: imx23-olinuxino: Fix polarity of LED GPIO
    - LP: #1471233
  * ARM: dts: imx23-olinuxino: Fix dr_mode of usb0
    - LP: #1471233
  * ARM: dts: imx25: Add #pwm-cells to pwm4
    - LP: #1471233
  * ARM: dts: imx28: Fix AUART4 TX-DMA interrupt name
    - LP: #1471233
  * gpio: sysfs: fix memory leaks and device hotplug
    - LP: #1471233
  * drm/radeon: disable semaphores for UVD V1 (v2)
    - LP: #1471233
  * RDMA/CMA: Canonize IPv4 on IPV6 sockets properly
    - LP: #1471233
  * drm/i915: Assume dual channel LVDS if pixel clock necessitates it
    - LP: #1471233
  * drm/i915: Add missing MacBook Pro models with dual channel LVDS
    - LP: #1471233
  * xen/console: Update console event channel on resume
    - LP: #1471233
  * xen/events: Set irq_info->evtchn before binding the channel to CPU in
    __startup_pirq()
    - LP: #1471233
  * mm/memory-failure: call shake_page() when error hits thp tail page
    - LP: #1471233
  * nilfs2: fix sanity check of btree level in nilfs_btree_root_broken()
    - LP: #1471233
  * ocfs2: dlm: fix race between purge and get lock resource
    - LP: #1471233
  * drm/radeon: make UVD handle checking more strict
    - LP: #1471233
  * drm/radeon: more strictly validate the UVD codec
    - LP: #1471233
  * path_openat(): fix double fput()
    - LP: #1471233
  * mnt: Fix fs_fully_visible to verify the root directory is visible
    - LP: #1471233
  * pinctrl: Don't just pretend to protect pinctrl_maps, do it for real
    - LP: #1471233
  * mmc: sh_mmcif: Fix timeout value for command request
    - LP: #1471233
  * xen-pciback: Add name prefix to global 'permissive' variable
    - LP: #1471233
  * mmc: core: add missing pm event in mmc_pm_notify to fix hib restore
    - LP: #1471233
  * thermal: step_wise: Revert optimization
    - LP: #1471233
  * libata: Add helper to determine when PHY events should be ignored
    - LP: #1471233
  * libata: Ignore spurious PHY event on LPM policy change
    - LP: #1471233
  * usb: gadget: configfs: Fix interfaces array NULL-termination
    - LP: #1471233
  * rtlwifi: rtl8192cu: Fix kernel deadlock
    - LP: #1471233
  * USB: cp210x: add ID for KCF Technologies PRN device
    - LP: #1471233
  * USB: pl2303: Remove support for Samsung I330
    - LP: #1471233
  * USB: visor: Match I330 phone more precisely
    - LP: #1471233
  * nfsd: fix the check for confirmed openowner in
    nfs4_preprocess_stateid_op
    - LP: #1471233
  * svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures
    - LP: #1471233
  * ACPI / init: Fix the ordering of acpi_reserve_resources()
    - LP: #1471233
  * md/raid5: don't record new size if resize_stripes fails.
    - LP: #1471233
  * xhci: fix isoc endpoint dequeue from advancing too far on transaction
    error
    - LP: #1471233
  * xhci: Solve full event ring by increasing TRBS_PER_SEGMENT to 256
    - LP: #1471233
  * xhci: gracefully handle xhci_irq dead device
    - LP: #1471233
  * usb-storage: Add NO_WP_DETECT quirk for Lacie 059f:0651 devices
    - LP: #1471233
  * ARM: net fix emit_udiv() for BPF_ALU | BPF_DIV | BPF_K intruction.
    - LP: #1471233
  * drm/radeon: fix VM_CONTEXT*_PAGE_TABLE_END_ADDR handling
    - LP: #1471233
  * drm/radeon: add new bonaire pci id
    - LP: #1471233
  * firmware: dmi_scan: Fix ordering of product_uuid
    - LP: #1471233
  * ext4: fix NULL pointer dereference when journal restart fails
    - LP: #1471233
  * ext4: check for zero length extent explicitly
    - LP: #1471233
  * jbd2: fix r_count overflows leading to buffer overflow in journal
    recovery
    - LP: #1471233
  * mm, numa: really disable NUMA balancing by default on single node
    machines
    - LP: #1471233
  * spi: bitbang: Make setup_transfer() callback optional
    - LP: #1471233
  * igb: Fix NULL assignment to incorrect variable in igb_reset_q_vector
    - LP: #1471233
  * ARM: net: delegate filter to kernel interpreter when imm_offset()
    return value can't fit into 12bits.
    - LP: #1471233
  * ALSA: hda - Add headphone quirk for Lifebook E752
    - LP: #1471233
  * ASoC: mc13783: Fix wrong mask value used in mc13xxx_reg_rmw() calls
    - LP: #1471233
  * ASoC: uda1380: Avoid accessing i2c bus when codec is disabled
    - LP: #1471233
  * mac80211: move WEP tailroom size check
    - LP: #1471233
  * KVM: MMU: fix smap permission check
    - LP: #1471233
  * KVM: MMU: fix CR4.SMEP=1, CR0.WP=0 with shadow pages
    - LP: #1471233
  * KVM: MMU: fix SMAP virtualization
    - LP: #1471233
  * storvsc: Set the SRB flags correctly when no data transfer is needed
    - LP: #1471233
  * ASoC: wm8960: fix "RINPUT3" audio route error
    - LP: #1471233
  * ASoC: wm8994: correct BCLK DIV 348 to 384
    - LP: #1471233
  * Input: elantech - fix semi-mt protocol for v3 HW
    - LP: #1471233
  * powerpc: Align TOC to 256 bytes
    - LP: #1471233
  * ALSA: hda - Add Conexant codecs CX20721, CX20722, CX20723 and CX20724
    - LP: #1454656, #1471233
  * mmc: atmel-mci: fix bad variable type for clkdiv
    - LP: #1471233
  * sd: Disable support for 256 byte/sector disks
    - LP: #1471233
  * libceph: request a new osdmap if lingering request maps to no osd
    - LP: #1471233
  * crypto: s390/ghash - Fix incorrect ghash icv buffer handling.
    - LP: #1471233
  * ipvs: fix memory leak in ip_vs_ctl.c
    - LP: #1471233
  * net: phy: Allow EEE for all RGMII variants
    - LP: #1471233
  * bridge: fix parsing of MLDv2 reports
    - LP: #1471233
  * ipv4: Avoid crashing in ip_error
    - LP: #1471233
  * ipv6: do not delete previously existing ECMP routes if add fails
    - LP: #1471233
  * ipv6: fix ECMP route replacement
    - LP: #1471233
  * net: core: Correct an over-stringent device loop detection.
    - LP: #1471233
  * x86: bpf_jit: fix compilation of large bpf programs
    - LP: #1471233
  * net: dp83640: fix broken calibration routine.
    - LP: #1471233
  * unix/caif: sk_socket can disappear when state is unlocked
    - LP: #1471233
  * net_sched: invoke ->attach() after setting dev->qdisc
    - LP: #1471233
  * udp: fix behavior of wrong checksums
    - LP: #1471233
  * xen: netback: read hotplug script once at start of day.
    - LP: #1471233
  * ipv4/udp: Verify multicast group is ours in upd_v4_early_demux()
    - LP: #1471233
  * drm/radeon: partially revert "fix VM_CONTEXT*_PAGE_TABLE_END_ADDR
    handling"
    - LP: #1471233
  * Linux 3.13.11-ckt22
    - LP: #1471233

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Tue, 07 Jul 2015 18:48:51 -0700

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https://bugs.launchpad.net/bugs/1425576

Title:
  Occasional crash in APM xgene enet driver on kernels prior to v3.19

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Released

Bug description:
  [Impact]
  System panics every few hours under constant network load

  [Test Case]
  On the X-Gene system, start an iperf server:
    $ iperf -s
  Connect to it from another system (1Gbps is sufficient)
    $ iperf -t 100000 -c <xgene host>

  On failure, you'll get a panic within several hours.

  [Regression Risk]
  The proposed patch only touches the impacted driver. It is adding a memory barrier - albeit a lightweight one - so there is the risk of a performance degradation. Indeed, when measured using a 60s iperf run, I do see a performance drop, but by < 0.5%.

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