Ah:

commit 336af6a4686d885a067ecea8c3c3dd129ba4fc75 (refs/bisect/bad)
Author: Michael Schaller <mi...@google.com>
Date:   Fri Sep 25 09:45:02 2020 +0200

    efivarfs: Replace invalid slashes with exclamation marks in dentries.
    
    Without this patch efivarfs_alloc_dentry creates dentries with slashes in
    their name if the respective EFI variable has slashes in its name. This in
    turn causes EIO on getdents64, which prevents a complete directory listing
    of /sys/firmware/efi/efivars/.
    
    This patch replaces the invalid shlashes with exclamation marks like
    kobject_set_name_vargs does for /sys/firmware/efi/vars/ to have consistently
    named dentries under /sys/firmware/efi/vars/ and /sys/firmware/efi/efivars/.
    
    Signed-off-by: Michael Schaller <mi...@google.com>
    Link: https://lore.kernel.org/r/20200925074502.150448-1-mi...@google.com
    Signed-off-by: Ard Biesheuvel <a...@kernel.org>

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https://bugs.launchpad.net/bugs/1899993

Title:
  EFI: Fails when BootCurrent entry does not exist

Status in curtin package in Ubuntu:
  Incomplete
Status in linux package in Ubuntu:
  Triaged

Bug description:
  Split out of bug 1894217.

  We're seeing a situation where curtin fails when the variable
  BootCurrent references does not exist.

  At boot, efibootmgr -v shows:

  BootCurrent: 0003
  Timeout: 10 seconds
  BootOrder: 0003,0004,0005,0006,0001

  Note that there are actually no individual boot entries in this
  output. BootCurrent and BootOrder are referencing Boot entries that do
  not apepar to exist.

  Later, curtin tries to set a new BootOrder that places the value of
  BootCurrent at the front. This causes efibootmgr to error out,
  apparently escalating to an installation failure:

          UEFI efibootmgr output after install:
          {'current': '0003', 'timeout': '10 seconds', 'order': ['0000'], 
'entries': {'0000': {'name
  ': 'ubuntu', 'path': 
'HD(1,GPT,0937ffdf-628c-4161-8b2f-5920235669c6,0x800,0x100000)/File(\\EFI\\ub
  untu\\shimx64.efi)'}}}
          Setting currently booted 0003 as the first UEFI loader.
          New UEFI boot order: 0003,0000
          Running command ['mount', '--bind', '/dev', 
'/tmp/tmp6ha4_iz2/target/dev'] with allowed re
  turn codes [0] (capture=False)
          Running command ['mount', '--bind', '/proc', 
'/tmp/tmp6ha4_iz2/target/proc'] with allowed 
  return codes [0] (capture=False)
          Running command ['mount', '--bind', '/run', 
'/tmp/tmp6ha4_iz2/target/run'] with allowed re
  turn codes [0] (capture=False)
          Running command ['mount', '--bind', '/sys', 
'/tmp/tmp6ha4_iz2/target/sys'] with allowed re
  turn codes [0] (capture=False)
          Running command ['mount', '--bind', '/sys/firmware/efi/efivars', 
'/tmp/tmp6ha4_iz2/target/
  sys/firmware/efi/efivars'] with allowed return codes [0] (capture=False)
          Running command ['unshare', '--fork', '--pid', '--', 'chroot', 
'/tmp/tmp6ha4_iz2/target', 
  'efibootmgr', '-o', '0003,0000'] with allowed return codes [0] (capture=False)
          Invalid BootOrder order entry value0003
                                               ^
          efibootmgr: entry 0003 does not exist

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