Public bug reported:

Crash happens during the setup (dpkg) phase of sbuild using a overlayfs
based chroot with the current bionic-proposed kernel (4.15.0-56-generic
#62-Ubuntu).

[25553.379381]  ? ovl_get_origin_fh+0x23/0x150 [overlay]
[25553.379386]  ? ovl_inode_test+0x20/0x20 [overlay]
[25553.379390]  ? ovl_lock_rename_workdir+0x50/0x50 [overlay]
[25553.379396]  ovl_get_inode+0xa2/0x450 [overlay]
[25553.379401]  ovl_lookup+0x275/0x760 [overlay]
[25553.379406]  lookup_slow+0xab/0x170
[25553.379409]  ? lookup_slow+0xab/0x170
[25553.379413]  walk_component+0x1c3/0x470
[25553.379416]  ? path_init+0x177/0x2f0
[25553.379419]  path_lookupat+0x84/0x1f0
[25553.379423]  ? __put_cred+0x3d/0x50
[25553.379426]  ? revert_creds+0x2f/0x40
[25553.379429]  filename_lookup+0xb6/0x190
[25553.379434]  ? __check_object_size+0xaf/0x1b0
[25553.379438]  user_path_at_empty+0x36/0x40
[25553.379441]  ? user_path_at_empty+0x36/0x40
[25553.379444]  SyS_chown+0x4d/0xe0
[25553.379449]  do_syscall_64+0x73/0x130
[25553.379453]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Bionic)
     Importance: High
         Status: Confirmed


** Tags: bionic

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Bionic)
       Status: New => Confirmed

** Changed in: linux (Ubuntu)
       Status: Confirmed => New

** Changed in: linux (Ubuntu Bionic)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1838982

Title:
  unable to handle kernel NULL pointer dereference at 000000000000002c
  (IP: iget5_locked+0x9e/0x1f0)

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Bionic:
  Confirmed

Bug description:
  Crash happens during the setup (dpkg) phase of sbuild using a
  overlayfs based chroot with the current bionic-proposed kernel
  (4.15.0-56-generic #62-Ubuntu).

  [25553.379381]  ? ovl_get_origin_fh+0x23/0x150 [overlay]
  [25553.379386]  ? ovl_inode_test+0x20/0x20 [overlay]
  [25553.379390]  ? ovl_lock_rename_workdir+0x50/0x50 [overlay]
  [25553.379396]  ovl_get_inode+0xa2/0x450 [overlay]
  [25553.379401]  ovl_lookup+0x275/0x760 [overlay]
  [25553.379406]  lookup_slow+0xab/0x170
  [25553.379409]  ? lookup_slow+0xab/0x170
  [25553.379413]  walk_component+0x1c3/0x470
  [25553.379416]  ? path_init+0x177/0x2f0
  [25553.379419]  path_lookupat+0x84/0x1f0
  [25553.379423]  ? __put_cred+0x3d/0x50
  [25553.379426]  ? revert_creds+0x2f/0x40
  [25553.379429]  filename_lookup+0xb6/0x190
  [25553.379434]  ? __check_object_size+0xaf/0x1b0
  [25553.379438]  user_path_at_empty+0x36/0x40
  [25553.379441]  ? user_path_at_empty+0x36/0x40
  [25553.379444]  SyS_chown+0x4d/0xe0
  [25553.379449]  do_syscall_64+0x73/0x130
  [25553.379453]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2

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