fix ftrace pid filtering on linux 5.8

[Colin Ian King]

A couple of ftrace kernel self test regression tests are failing on
systems with 1 CPU, notably small 1 CPU cloud instances. The two
tests that are failing are:

[20] ftrace - function graph filters with stack tracer
[21] ftrace - function graph filters

Bisected this down to commit 717e3f5ebc82 ("ftrace: Make function
trace pid filtering a bit more exact") in linux 5.6-rc4 and found
and tested an upstream fix to this issue with the commit
c58b6b0372de ("ftrace: Fix ftrace_trace_task return value").

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1891528

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Colin Ian King (colin-king)]

Commit applied: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/groovy/commit/?h=master-next&id=58c50e922166b40144af32c8d5049ab8ac93f483

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.8.0-18.19

---------------
linux (5.8.0-18.19) groovy; urgency=medium

  * groovy/linux: 5.8.0-18.19 -proposed tracker (LP: #1893047)

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * Groovy update: v5.8.4 upstream stable release (LP: #1893048)
    - drm/vgem: Replace opencoded version of drm_gem_dumb_map_offset()
    - drm/panel-simple: Fix inverted V/H SYNC for Frida FRD350H54004 panel
    - drm/ast: Remove unused code paths for AST 1180
    - drm/ast: Initialize DRAM type before posting GPU
    - khugepaged: adjust VM_BUG_ON_MM() in __khugepaged_enter()
    - ALSA: hda: avoid reset of sdo_limit
    - ALSA: hda/realtek: Add quirk for Samsung Galaxy Flex Book
    - ALSA: hda/realtek: Add quirk for Samsung Galaxy Book Ion
    - can: j1939: transport: j1939_session_tx_dat(): fix use-after-free read in
      j1939_tp_txtimer()
    - can: j1939: socket: j1939_sk_bind(): make sure ml_priv is allocated
    - spi: Prevent adding devices below an unregistering controller
    - io_uring: find and cancel head link async work on files exit
    - mm/vunmap: add cond_resched() in vunmap_pmd_range
    - romfs: fix uninitialized memory leak in romfs_dev_read()
    - kernel/relay.c: fix memleak on destroy relay channel
    - uprobes: __replace_page() avoid BUG in munlock_vma_page()
    - squashfs: avoid bio_alloc() failure with 1Mbyte blocks
    - mm: include CMA pages in lowmem_reserve at boot
    - mm, page_alloc: fix core hung in free_pcppages_bulk()
    - ASoC: amd: renoir: restore two more registers during resume
    - RDMA/hfi1: Correct an interlock issue for TID RDMA WRITE request
    - opp: Enable resources again if they were disabled earlier
    - opp: Put opp table in dev_pm_opp_set_rate() for empty tables
    - opp: Put opp table in dev_pm_opp_set_rate() if _set_opp_bw() fails
    - ext4: do not block RWF_NOWAIT dio write on unallocated space
    - ext4: fix checking of directory entry validity for inline directories
    - jbd2: add the missing unlock_buffer() in the error path of
      jbd2_write_superblock()
    - scsi: zfcp: Fix use-after-free in request timeout handlers
    - selftests: kvm: Use a shorter encoding to clear RAX
    - s390/pci: fix zpci_bus_link_virtfn()
    - s390/pci: re-introduce zpci_remove_device()
    - s390/pci: fix PF/VF linking on hot plug
    - s390/pci: ignore stale configuration request event
    - mm/memory.c: skip spurious TLB flush for retried page fault
    - drm: amdgpu: Use the correct size when allocating memory
    - drm/amdgpu/display: use GFP_ATOMIC in dcn20_validate_bandwidth_internal
    - drm/amd/display: Fix incorrect backlight register offset for DCN
    - drm/amd/display: Fix EDID parsing after resume from suspend
    - drm/amd/display: Blank stream before destroying HDCP session
    - drm/amd/display: Fix DFPstate hang due to view port changed
    - drm/amd/display: fix pow() crashing when given base 0
    - drm/i915/pmu: Prefer drm_WARN_ON over WARN_ON
    - drm/i915: Provide the perf pmu.module
    - scsi: ufs: Add DELAY_BEFORE_LPM quirk for Micron devices
    - scsi: target: tcmu: Fix crash in tcmu_flush_dcache_range on ARM
  ...