Have been using the new kernel on Ubuntu 20.04 since 17th. Have tested
the following scenarios

On power
On battery
Closed Lid
Suspend from Shutdown menu
Cold reboot

Have not seen the crash since then. Anything else to do? Install 21.04
and the custom kernel and try again?

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https://bugs.launchpad.net/bugs/1927866

Title:
  Root filesystem becomes readonly frequenty freezing system

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a brand new Lenovo Ideapad Flex 5.14 which came with Windows 10
  and I have installed Ubuntu 21.04 with dual boot.

  I am running into this problem where the root filesystem becomes
  readonly and the system freezes with a screen full of errors shown
  about unable to write to filesystem.

  I booted into a live boot usb and did fsck and e2fsck but did not see
  any errors there. I read online that this could be because of io
  errors but smartctl and fsck does not show any errors

  So I was wondering if this could be a bug vs a hardward issue. Please
  let me know if you need any further information from the system.

  =============================================================
  =============================================================

  fdisk -l /dev/nvme0n1
  Disk /dev/nvme0n1: 476.94 GiB, 512110190592 bytes, 1000215216 sectors
  Disk model: WDC PC SN530 SDBPMPZ-512G-1101
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: gpt
  Disk identifier: E8803E28-C4F7-4FA5-9B6D-0F3CAB7027A5

  Device             Start        End   Sectors   Size Type
  /dev/nvme0n1p1      2048     534527    532480   260M EFI System
  /dev/nvme0n1p2    534528     567295     32768    16M Microsoft reserved
  /dev/nvme0n1p3    567296  199446527 198879232  94.8G Microsoft basic data
  /dev/nvme0n1p4 998166528 1000214527   2048000  1000M Windows recovery 
environmen
  /dev/nvme0n1p5 199446528  203352063   3905536   1.9G Linux filesystem
  /dev/nvme0n1p6 203352064  219353087  16001024   7.6G Linux swap
  /dev/nvme0n1p7 219353088  414664703 195311616  93.1G Linux filesystem
  /dev/nvme0n1p8 414664704  998166527 583501824 278.2G Microsoft basic data

  =============================================================
  =============================================================

  smartctl -a /dev/nvme0
  smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.11.0-16-generic] (local build)
  Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

  === START OF INFORMATION SECTION ===
  Model Number:                       WDC PC SN530 SDBPMPZ-512G-1101
  Serial Number:                      205135806243
  Firmware Version:                   21160001
  PCI Vendor/Subsystem ID:            0x15b7
  IEEE OUI Identifier:                0x001b44
  Total NVM Capacity:                 512,110,190,592 [512 GB]
  Unallocated NVM Capacity:           0
  Controller ID:                      1
  NVMe Version:                       1.4
  Number of Namespaces:               1
  Namespace 1 Size/Capacity:          512,110,190,592 [512 GB]
  Namespace 1 Formatted LBA Size:     512
  Namespace 1 IEEE EUI-64:            001b44 8b484daff7
  Local Time is:                      Sun May  9 12:45:05 2021 EDT
  Firmware Updates (0x14):            2 Slots, no Reset required
  Optional Admin Commands (0x0017):   Security Format Frmw_DL Self_Test
  Optional NVM Commands (0x005f):     Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat 
Timestmp
  Log Page Attributes (0x1e):         Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg 
Pers_Ev_Lg
  Maximum Data Transfer Size:         128 Pages
  Warning  Comp. Temp. Threshold:     80 Celsius
  Critical Comp. Temp. Threshold:     85 Celsius
  Namespace 1 Features (0x02):        NA_Fields

  Supported Power States
  St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
   0 +     3.50W    2.10W       -    0  0  0  0        0       0
   1 +     2.40W    1.60W       -    0  0  0  0        0       0
   2 +     1.90W    1.50W       -    0  0  0  0        0       0
   3 -   0.0250W       -        -    3  3  3  3     3900   11000
   4 -   0.0050W       -        -    4  4  4  4     5000   39000

  Supported LBA Sizes (NSID 0x1)
  Id Fmt  Data  Metadt  Rel_Perf
   0 +     512       0         2
   1 -    4096       0         1

  === START OF SMART DATA SECTION ===
  SMART overall-health self-assessment test result: PASSED

  SMART/Health Information (NVMe Log 0x02)
  Critical Warning:                   0x00
  Temperature:                        35 Celsius
  Available Spare:                    100%
  Available Spare Threshold:          10%
  Percentage Used:                    0%
  Data Units Read:                    624,535 [319 GB]
  Data Units Written:                 526,042 [269 GB]
  Host Read Commands:                 4,462,163
  Host Write Commands:                4,686,788
  Controller Busy Time:               25
  Power Cycles:                       20
  Power On Hours:                     76
  Unsafe Shutdowns:                   9
  Media and Data Integrity Errors:    0
  Error Information Log Entries:      1
  Warning  Comp. Temperature Time:    0
  Critical Comp. Temperature Time:    0

  Error Information (NVMe Log 0x01, 16 of 256 entries)
  No Errors Logged

  =============================================================
  =============================================================

  cat /etc/fstab
  # /etc/fstab: static file system information.
  #
  # Use 'blkid' to print the universally unique identifier for a
  # device; this may be used with UUID= as a more robust way to name devices
  # that works even if disks are added and removed. See fstab(5).
  #
  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  # / was on /dev/nvme0n1p7 during installation
  UUID=3167581c-60b0-4db8-972c-a8dfafc882c5 /               ext4    
errors=remount-ro 0       1
  # /boot was on /dev/nvme0n1p5 during installation
  UUID=9c06f7c8-ad3b-4b90-b32c-4d4099b4548d /boot           ext4    defaults    
    0       2
  # /boot/efi was on /dev/nvme0n1p1 during installation
  UUID=6C28-8155  /boot/efi       vfat    umask=0077      0       1
  # swap was on /dev/nvme0n1p6 during installation
  UUID=38034881-4f37-4d16-8cc5-e343f61b4ef7 none            swap    sw          
    0       0
  /dev/disk/by-uuid/0F7EA5A832F72C99 /mnt/0F7EA5A832F72C99 auto 
nosuid,nodev,nofail,x-gvfs-show 0 0

  =============================================================
  =============================================================

  nvme error-log shows the same error message as below, all 64 of them
  are identical. Pasting one item here.

  nvme error-log /dev/nvme0
  Error Log Entries for device:nvme0 entries:64
  .................
   Entry[ 0]   
  .................
  error_count   : 0
  sqid          : 0
  cmdid         : 0
  status_field  : 0(SUCCESS: The command completed successfully)
  parm_err_loc  : 0
  lba           : 0
  nsid          : 0
  vs            : 0
  trtype                : The transport type is not indicated or the error is 
not transport related.
  cs            : 0
  trtype_spec_info: 0
  .................
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.11-0ubuntu65
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  anoopjohn   1695 F.... pulseaudio
   /dev/snd/pcmC1D0p:   anoopjohn   1695 F...m pulseaudio
   /dev/snd/controlC0:  anoopjohn   1695 F.... pulseaudio
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 21.04
  InstallationDate: Installed on 2021-04-30 (11 days ago)
  InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  MachineType: LENOVO 82HU
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-16-generic 
root=UUID=3167581c-60b0-4db8-972c-a8dfafc882c5 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
  RelatedPackageVersions:
   linux-restricted-modules-5.11.0-16-generic N/A
   linux-backports-modules-5.11.0-16-generic  N/A
   linux-firmware                             1.197
  Tags:  hirsute wayland-session
  Uname: Linux 5.11.0-16-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/23/2021
  dmi.bios.release: 1.19
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJCN19WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: IdeaPad Flex 5 14ALC05
  dmi.ec.firmware.release: 1.12
  dmi.modalias: 
dmi:bvnLENOVO:bvrGJCN19WW:bd02/23/2021:br1.19:efr1.12:svnLENOVO:pn82HU:pvrIdeaPadFlex514ALC05:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrIdeaPadFlex514ALC05:
  dmi.product.family: IdeaPad Flex 5 14ALC05
  dmi.product.name: 82HU
  dmi.product.sku: LENOVO_MT_82HU_BU_idea_FM_IdeaPad Flex 5 14ALC05
  dmi.product.version: IdeaPad Flex 5 14ALC05
  dmi.sys.vendor: LENOVO

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