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[Launchpad Bug Tracker <1903596@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-135.139

---------------
linux (4.15.0-135.139) bionic; urgency=medium

  * bionic/linux: 4.15.0-135.139 -proposed tracker (LP: #1912223)

  * [drm:qxl_enc_commit [qxl]] *ERROR* head number too large or missing monitors
    config: (LP: #1908219)
    - qxl: remove qxl_io_log()
    - qxl: move qxl_send_monitors_config()
    - qxl: hook monitors_config updates into crtc, not encoder.

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

  * vmx_nm_test in ubuntu_kvm_unit_tests interrupted on X-oracle-4.15 /
    B-oracle-4.15 / X-KVM / B-KVM (LP: #1872401)
    - KVM: nVMX: Always reflect #NM VM-exits to L1

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

  * CVE-2020-27777
    - [Config]: Set CONFIG_PPC_RTAS_FILTER

  * Bionic update: upstream stable patchset 2020-12-04 (LP: #1906875)
    - regulator: defer probe when trying to get voltage from unresolved supply
    - ring-buffer: Fix recursion protection transitions between interrupt context
    - time: Prevent undefined behaviour in timespec64_to_ns()
    - nbd: don't update block size after device is started
    - btrfs: sysfs: init devices outside of the chunk_mutex
    - btrfs: reschedule when cloning lots of extents
    - genirq: Let GENERIC_IRQ_IPI select IRQ_DOMAIN_HIERARCHY
    - hv_balloon: disable warning when floor reached
    - net: xfrm: fix a race condition during allocing spi
    - perf tools: Add missing swap for ino_generation
    - ALSA: hda: prevent undefined shift in snd_hdac_ext_bus_get_link()
    - can: rx-offload: don't call kfree_skb() from IRQ context
    - can: dev: can_get_echo_skb(): prevent call to kfree_skb() in hard IRQ
      context
    - can: dev: __can_get_echo_skb(): fix real payload length return value for RTR
      frames
    - can: can_create_echo_skb(): fix echo skb generation: always use skb_clone()
    - can: peak_usb: add range checking in decode operations
    - can: peak_usb: peak_usb_get_ts_time(): fix timestamp wrapping
    - can: peak_canfd: pucan_handle_can_rx(): fix echo management when loopback is
      on
    - xfs: flush new eof page on truncate to avoid post-eof corruption
    - Btrfs: fix missing error return if writeback for extent buffer never started
    - ath9k_htc: Use appropriate rs_datalen type
    - usb: gadget: goku_udc: fix potential crashes in probe
    - gfs2: Free rd_bits later in gfs2_clear_rgrpd to fix use-after-free
    - gfs2: Add missing truncate_inode_pages_final for sd_aspace
    - gfs2: check for live vs. read-only file system in gfs2_fitrim
    - scsi: hpsa: Fix memory leak in hpsa_init_one()
    - drm/amdgpu: perform srbm soft reset always on SDMA resume
    - mac80211: fix use of skb payload instead of header
    - cfg80211: regulatory: Fix inconsistent format argument
    - scsi: scsi_dh_alua: Avoid crash during alua_bus_detach()
    - iommu/amd: Increase interrupt remapping table limit to 512 entries
    - pinctrl: intel: Set default bias in case no particular value given
    - ARM: 9019/1: kprobes: Avoid fortify_panic() when copying optprobe template
    - pinctrl: aspeed: Fix GPI only function problem.
    - nbd: fix a block_device refcount leak in nbd_release
    - xfs: fix flags argument to rmap lookup when converting shared file rmaps
    - xfs: fix rmap key and record comparison functions
    - xfs: fix a missing unlock on error in xfs_fs_map_blocks
    - of/address: Fix of_node memory leak in of_dma_is_coherent
    - cosa: Add missing kfree in error path of cosa_write
    - perf: Fix get_recursion_context()
    - ext4: correctly report "not supported" for {usr,grp}jquota when
      !CONFIG_QUOTA
    - ext4: unlock xattr_sem properly in ext4_inline_data_truncate()
    - thunderbolt: Add the missed ida_simple_remove() in ring_request_msix()
    - uio: Fix use-after-free in uio_unregister_device()
    - usb: cdc-acm: Add DISABLE_ECHO for Renesas USB Download mode
    - mei: protect mei_cl_mtu from null dereference
    - futex: Don't enable IRQs unconditionally in put_pi_state()
    - ocfs2: initialize ip_next_orphan
    - selinux: Fix error return code in sel_ib_pkey_sid_slow()
    - don't dump the threads that had been already exiting when zapped.
    - drm/gma500: Fix out-of-bounds access to struct drm_device.vblank[]
    - pinctrl: amd: use higher precision for 512 RtcClk
    - pinctrl: amd: fix incorrect way to disable debounce filter
    - swiotlb: fix "x86: Don't panic if can not alloc buffer for swiotlb"
    - IPv6: Set SIT tunnel hard_header_len to zero
    - net/af_iucv: fix null pointer dereference on shutdown
    - net/x25: Fix null-ptr-deref in x25_connect
    - vrf: Fix fast path output packet handling with async Netfilter rules
    - r8169: fix potential skb double free in an error path
    - net: Update window_clamp if SOCK_RCVBUF is set
    - random32: make prandom_u32() output unpredictable
    - x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-
      on STIBP
    - perf/core: Fix bad use of igrab()
    - perf/core: Fix crash when using HW tracing kernel filters
    - perf/core: Fix a memory leak in perf_event_parse_addr_filter()
    - Revert "kernel/reboot.c: convert simple_strtoul to kstrtoint"
    - reboot: fix overflow parsing reboot cpu number
    - Convert trailing spaces and periods in path components
    - xfs: fix scrub flagging rtinherit even if there is no rt device
    - drm/amd/pm: perform SMC reset on suspend/hibernation
    - drm/amd/pm: do not use ixFEATURE_STATUS for checking smc running
    - s390/smp: move rcu_cpu_starting() earlier
    - tpm_tis: Disable interrupts on ThinkPad T490s
    - tick/common: Touch watchdog in tick_unfreeze() on all CPUs
    - mfd: sprd: Add wakeup capability for PMIC IRQ
    - btrfs: ref-verify: fix memory leak in btrfs_ref_tree_mod
    - thunderbolt: Fix memory leak if ida_simple_get() fails in
      enumerate_services()
    - btrfs: fix potential overflow in cluster_pages_for_defrag on 32bit arch
    - mmc: renesas_sdhi_core: Add missing tmio_mmc_host_free() at remove

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Mon, 18 Jan
2021 18:20:48 +0100

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

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-27777

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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 Committed
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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