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[Launchpad Bug Tracker <1903596@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.4.0-201.233

---------------
linux (4.4.0-201.233) xenial; urgency=medium

  * xenial/linux: 4.4.0-201.233 -proposed tracker (LP: #1911265)

  * Touchpad not detected on ByteSpeed C15B laptop (LP: #1906128)
    - Input: i8042 - add ByteSpeed touchpad to noloop table

  * stack trace in kernel (LP: #1903596)
    - net: napi: remove useless stack trace

  * CVE-2020-27777
    - powerpc/rtas: Restrict RTAS requests from userspace
    - [Config]: Set CONFIG_PPC_RTAS_FILTER

  * Xenial update: v4.4.247 upstream stable release (LP: #1906703)
    - btrfs: tree-checker: Enhance chunk checker to validate chunk profile
    - btrfs: inode: Verify inode mode to avoid NULL pointer dereference
    - HID: cypress: Support Varmilo Keyboards' media hotkeys
    - Input: i8042 - allow insmod to succeed on devices without an i8042
      controller
    - HID: hid-sensor-hub: Fix issue with devices with no report ID
    - x86/xen: don't unbind uninitialized lock_kicker_irq
    - proc: don't allow async path resolution of /proc/self components
    - dmaengine: pl330: _prep_dma_memcpy: Fix wrong burst size
    - scsi: libiscsi: Fix NOP race condition
    - scsi: target: iscsi: Fix cmd abort fabric stop race
    - scsi: ufs: Fix race between shutdown and runtime resume flow
    - bnxt_en: fix error return code in bnxt_init_board()
    - video: hyperv_fb: Fix the cache type when mapping the VRAM
    - bnxt_en: Release PCI regions when DMA mask setup fails during probe.
    - IB/mthca: fix return value of error branch in mthca_init_cq()
    - nfc: s3fwrn5: use signed integer for parsing GPIO numbers
    - efivarfs: revert "fix memory leak in efivarfs_create()"
    - perf probe: Fix to die_entrypc() returns error correctly
    - USB: core: Change %pK for __user pointers to %px
    - x86/speculation: Fix prctl() when spectre_v2_user={seccomp,prctl},ibpb
    - USB: core: add endpoint-blacklist quirk
    - USB: core: Fix regression in Hercules audio card
    - btrfs: fix lockdep splat when reading qgroup config on mount
    - Linux 4.4.247

  * Xenial update: v4.4.246 upstream stable release (LP: #1906700)
    - ah6: fix error return code in ah6_input()
    - atm: nicstar: Unmap DMA on send error
    - net: b44: fix error return code in b44_init_one()
    - net: bridge: add missing counters to ndo_get_stats64 callback
    - netlabel: fix our progress tracking in netlbl_unlabel_staticlist()
    - netlabel: fix an uninitialized warning in netlbl_unlabel_staticlist()
    - net/mlx4_core: Fix init_hca fields offset
    - net: x25: Increase refcnt of "struct x25_neigh" in x25_rx_call_request
    - qlcnic: fix error return code in qlcnic_83xx_restart_hw()
    - sctp: change to hold/put transport for proto_unreach_timer
    - net: usb: qmi_wwan: Set DTR quirk for MR400
    - net: Have netpoll bring-up DSA management interface
    - pinctrl: rockchip: enable gpio pclk for rockchip_gpio_to_irq
    - arm64: psci: Avoid printing in cpu_psci_cpu_die()
    - MIPS: Fix BUILD_ROLLBACK_PROLOGUE for microMIPS
    - Input: adxl34x - clean up a data type in adxl34x_probe()
    - arm: dts: imx6qdl-udoo: fix rgmii phy-mode for ksz9031 phy
    - ARM: dts: imx50-evk: Fix the chip select 1 IOMUX
    - perf lock: Don't free "lock_seq_stat" if read_count isn't zero
    - can: dev: can_restart(): post buffer from the right context
    - can: peak_usb: fix potential integer overflow on shift of a int
    - can: m_can: m_can_handle_state_change(): fix state change
    - MIPS: Alchemy: Fix memleak in alchemy_clk_setup_cpu
    - regulator: ti-abb: Fix array out of bound read access on the first
      transition
    - libfs: fix error cast of negative value in simple_attr_write()
    - ALSA: ctl: fix error path at adding user-defined element set
    - ALSA: mixart: Fix mutex deadlock
    - tty: serial: imx: keep console clocks always on
    - efivarfs: fix memory leak in efivarfs_create()
    - ext4: fix bogus warning in ext4_update_dx_flag()
    - xtensa: disable preemption around cache alias management calls
    - mac80211: minstrel: remove deferred sampling code
    - mac80211: minstrel: fix tx status processing corner case
    - mac80211: allow driver to prevent two stations w/ same address
    - mac80211: free sta in sta_info_insert_finish() on errors
    - s390/cpum_sf.c: fix file permission for cpum_sfb_size
    - x86/microcode/intel: Check patch signature before saving microcode for early
      loading
    - Linux 4.4.246

  * Xenial update: v4.4.245 upstream stable release (LP: #1906698)
    - i2c: imx: Fix external abort on interrupt in exit paths
    - xfs: catch inode allocation state mismatch corruption
    - xfs: validate cached inodes are free when allocated
    - powerpc/8xx: Always fault when _PAGE_ACCESSED is not set
    - Input: sunkbd - avoid use-after-free in teardown paths
    - mac80211: always wind down STA state
    - KVM: x86: clflushopt should be treated as a no-op by emulation
    - Linux 4.4.245

 -- Kelsey Skunberg <kelsey.skunberg@xxxxxxxxxxxxx>  Wed, 13 Jan 2021
17:48:34 -0700

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

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https://bugs.launchpad.net/bugs/1903596

Title:
  stack trace in kernel

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Focal:
  Fix Committed
Status in linux source package in Groovy:
  Fix Committed
Status in linux source package in Hirsute:
  In Progress

Bug description:
  == SRU Justification ==
  Whenever a buggy NAPI driver returns more than its budget, it will
  trigger a stack trace warning with:
      WARN_ON_ONCE(work > weight);

  The warning message looks like this :
      WARNING: CPU: 2 PID: 0 at /build/linux-hwe-ymdo11/linux-hwe-4.15.0/net/core/dev.c:5672 net_rx_action+0x276/0x3b0

  This is not very useful for debugging purpose, since it does not tell
  you what's going on there.

  == Fix ==
  * 427d5838e996 ("net: napi: remove useless stack trace")

  This patch will emit a message giving the function name, and a
  descriptive message like:
      NAPI poll function ath10k_pci_napi_poll+0x0/0x120 [ath10k_pci] returned 0, exceeding its budget of 64.

  This patch is a clean-cherry for all the releases except Xenial.
  For Xenial it will need to be applied with -C1

  == Test ==
  Test kernels can be found here:
  https://people.canonical.com/~phlin/kernel/lp-1903596-napi-warnon/

  Please note that even though I tried to reproduce this on a XPS 13
  9360 mentioned in this bug report that shipped with Atheros QCA6174
  [168c:003e] wireless card, but I can't trigger this warning message.
  The bug opener is also unable to test this due to some other reasons.

  Howeve I did tried to trigger this warning forcibly by putting it
  outside the if statement with the test kernels in the following link
  to make sure it won't cause some other problem.

  https://people.canonical.com/~phlin/kernel/lp-1903596-napi-warnon
  /force-to-warn/

  == Where problems could occur ==
  For this bug itself, this patch does not really solve the problem
  but it will provide more debug information for developers in the
  future (and since this is just a warning message, it should be fine).
  We can expect to see more a detailed report against ath10k driver
  in the future on launchpad.


  == Original Bug Report ==
  This appears to be a problem in the ath10k module. I am not sure what it is exactly.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.15.0-122-generic 4.15.0-122.124~16.04.1
  ProcVersionSignature: Ubuntu 4.15.0-122.124~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-122-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.26
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Nov  9 13:35:54 2020
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  InstallationDate: Installed on 2020-11-09 (0 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  SourcePackage: linux-signed-hwe
  UpgradeStatus: No upgrade log present (probably fresh install)

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