Ubuntu 16.04 kernel 4.4.0-202 basic commands hanging

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 1913853

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.

Unless absolutely necessary I do not wish to boot that broken kernel again.

I can confirm I'm seeing similar behavior on 4.4.0-202

Hello Marcel and everyone else affected,

Thank you for reporting this issue. Xenial kernel 4.4.0-202 is still in -proposed therefore it's expected to be unstable. We are investigating the issues with this kernel version and will publish an update as soon as possible. In the meantime please downgrade to version -201 to have an usable system again.

Thanks Kleber, I see now that this is what happens when you check a checkbox (Pre-released updates) and five years later don't even remember it. :-)

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

Xenial kernel 4.4.0-203.235 in -proposed contains a revert for a patch that we believe was causing this issue. Could someone please test this version to help us validate the fix?

Thank you.

I've installed the latest in proposed:
4.4.0-203-generic #235-Ubuntu SMP Tue Feb 2 02:49:08 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

So far I've seen no issues after about 8 hours of running this kernel.

Seems working fine for me, thx.

This bug was fixed in the package linux - 4.4.0-203.235

---------------
linux (4.4.0-203.235) xenial; urgency=medium

  * xenial/linux: 4.4.0-203.235 -proposed tracker (LP: #1914140)

  * Ubuntu 16.04 kernel 4.4.0-202 basic commands hanging (LP: #1913853)
    - SAUCE: Revert "mm: check that mm is still valid in madvise()"

linux (4.4.0-202.234) xenial; urgency=medium

  * xenial/linux: 4.4.0-202.234 -proposed tracker (LP: #1913086)

  * DMI entry syntax fix for Pegatron / ByteSpeed C15B (LP: #1910639)
    - Input: i8042 - unbreak Pegatron C15B

  * CVE-2020-29372
    - mm: check that mm is still valid in madvise()

  * errinjct open fails on IBM POWER LPAR (LP: #1908710)
    - powerpc/rtas: Fix typo of ibm, open-errinjct in RTAS filter

  * 4.4 kernel panics in kvm wake_up() handler (LP: #1908428)
    - kvm: vmx: rename vmx_pre/post_block to pi_pre/post_block
    - KVM: VMX: extract __pi_post_block
    - KVM: VMX: avoid double list add with VT-d posted interrupts

  * restore reverted commit "crypto: arm64/sha - avoid non-standard inline asm
    tricks" (LP: #1907489)
    - crypto: arm64/sha - avoid non-standard inline asm tricks

  * CVE-2020-29374
    - gup: document and work around "COW can break either way" issue

  * Xenial update: v4.4.249 upstream stable release (LP: #1910139)
    - spi: bcm2835aux: Fix use-after-free on unbind
    - spi: bcm2835aux: Restore err assignment in bcm2835aux_spi_probe
    - ARC: stack unwinding: don't assume non-current task is sleeping
    - platform/x86: acer-wmi: add automatic keyboard background light toggle key
      as KEY_LIGHTS_TOGGLE
    - Input: cm109 - do not stomp on control URB
    - Input: i8042 - add Acer laptops to the i8042 reset list
    - [Config] updateconfigs for SPI_DYNAMIC
    - spi: Prevent adding devices below an unregistering controller
    - net/mlx4_en: Avoid scheduling restart task if it is already running
    - tcp: fix cwnd-limited bug for TSO deferral where we send nothing
    - net: stmmac: delete the eee_ctrl_timer after napi disabled
    - net: bridge: vlan: fix error return code in __vlan_add()
    - USB: dummy-hcd: Fix uninitialized array use in init()
    - USB: add RESET_RESUME quirk for Snapscan 1212
    - ALSA: usb-audio: Fix potential out-of-bounds shift
    - ALSA: usb-audio: Fix control 'access overflow' errors from chmap
    - xhci: Give USB2 ports time to enter U3 in bus suspend
    - USB: sisusbvga: Make console support depend on BROKEN
    - [Config] updateconfigs for USB_SISUSBVGA_CON
    - ALSA: pcm: oss: Fix potential out-of-bounds shift
    - serial: 8250_omap: Avoid FIFO corruption caused by MDR1 access
    - USB: serial: cp210x: enable usb generic throttle/unthrottle
    - scsi: bnx2i: Requires MMU
    - can: softing: softing_netdev_open(): fix error handling
    - RDMA/cm: Fix an attempt to use non-valid pointer when cleaning timewait
    - dm table: Remove BUG_ON(in_interrupt())
    - soc/tegra: fuse: Fix index bug in get_process_id
    - USB: serial: option: add interface-number sanity check to flag handling
    - USB: gadget: f_rndis: fix bitrate for SuperSpeed and above
    - usb: chipidea: ci_hdrc_imx: Pass DISABLE_DEVICE_STREAMING flag to imx6ul
...