Comment 64 for bug 1879980

I am running a laptop with an internal nvme that is partitioned to contain an encrypted LUKS partition that contains an LVM2 PV. That PV contains part of an LV (lvubuntu) which also includes a partition residing on an external USB drive. The theory is that I'll make part of the external PV into a RAID-1 image of the internal partition, which will automatically back up the internal nvme whenever I plug in that drive, making it a USB-bootable bit-for-bit copy. (That part doesn't work yet because of a blocksize mismatch between the 4k hard drive and the 512b nvme partition; I'll need to dump, reformat, and restore the nvme LV into 4k blocks before LVM will succeed in making it part of a RAID set.)

I have been able to boot this laptop (without the external drive attached) even prior to this bug fix. I can't tell you exactly how it worked, but it worked, possibly because the RAID1 isn't set up yet; instead the LV just includes both PV's.

I upgraded to the released fix for this bug in 20.04, as part of installing all current security patches. Now when I boot the system, it detects the encrypted partition, asks for the password, gets it, and succeeds in fsck-ing the root partition. But then it loops and fsck's it again. And again. And again. (I noticed this by the long delay with the circling icon on the splash screen. I switched to ctrl-alt-F1 to see console messages and there I see it doing the fsck over and over.) Eventually THIS behavior times out too, and the system does boot.

But I suspect that this is not exactly what you wanted this patch to do. It used to boot very quickly, now after the patch for this bugfix, it doesn't.

I'm running 20.04.1 on an amd64 (Lenovo Ideapad Flex 5 14", AMD Ryzen 5 4500U) laptop.

# pvdisplay
  WARNING: Couldn't find device with uuid u2T6W5-rI3L-40C8-rZc3-uS6H-rMsV-U58ic5.
  WARNING: VG vgubuntu is missing PV u2T6W5-rI3L-40C8-rZc3-uS6H-rMsV-U58ic5 (last written to /dev/mapper/luks-d43f3ec2-2633-46d0-bd1b-1c9f46e13c4d).
  --- Physical volume ---
  PV Name /dev/mapper/nvme0n1p3_crypt
  VG Name vgubuntu
  PV Size 237.24 GiB / not usable 0
  Allocatable yes
  PE Size 4.00 MiB
  Total PE 60734
  Free PE 253
  Allocated PE 60481
  PV UUID SQ4XNm-dKJQ-ild3-dx2k-lrGL-fqay-5rY8nY

  --- Physical volume ---
  PV Name [unknown]
  VG Name vgubuntu
  PV Size <3.64 TiB / not usable 4.00 MiB
  Allocatable yes
  PE Size 4.00 MiB
  Total PE 953610
  Free PE 817930
  Allocated PE 135680
  PV UUID u2T6W5-rI3L-40C8-rZc3-uS6H-rMsV-U58ic5

# lvdisplay
  WARNING: Couldn't find device with uuid u2T6W5-rI3L-40C8-rZc3-uS6H-rMsV-U58ic5.
  WARNING: VG vgubuntu is missing PV u2T6W5-rI3L-40C8-rZc3-uS6H-rMsV-U58ic5 (last written to /dev/mapper/luks-d43f3ec2-2633-46d0-bd1b-1c9f46e13c4d).
  --- Logical volume ---
  LV Path /dev/vgubuntu/root
  LV Name root
  VG Name vgubuntu
  LV UUID Dy2wIe-nhEd-BZN5-i3bg-AU3P-uenQ-fuPkSR
  LV Write Access read/write
  LV Creation host, time ubuntu, 2020-07-16 16:55:07 -0700
  LV Status available
  # open 1
  LV Size 236.25 GiB
  Current LE 60481
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 253:1

  --- Logical volume ---
  LV Path /dev/vgubuntu/root4tb
  LV Name root4tb
  VG Name vgubuntu
  LV UUID KFe7kE-bPOs-md1j-iVqT-kBQy-mj1U-XTpfM9
  LV Write Access read/write
  LV Creation host, time pad.toad.com, 2020-09-03 01:11:24 -0700
  LV Status NOT available
  LV Size 230.00 GiB
  Current LE 58880
  Segments 1
  Allocation inherit
  Read ahead sectors auto

  --- Logical volume ---
  LV Path /dev/vgubuntu/misc
  LV Name misc
  VG Name vgubuntu
  LV UUID QKd7pK-CfdG-VxFb-VThb-QzWy-oKVO-NQdchx
  LV Write Access read/write
  LV Creation host, time pad.toad.com, 2020-09-03 01:40:22 -0700
  LV Status NOT available
  LV Size 300.00 GiB
  Current LE 76800
  Segments 1
  Allocation inherit
  Read ahead sectors auto

#