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
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] test+0x20/ 0x20 [overlay] rename_ workdir+ 0x50/0x50 [overlay] inode+0xa2/ 0x450 [overlay] 0x275/0x760 [overlay] slow+0xab/ 0x170 slow+0xab/ 0x170 0x1c3/0x470 0x177/0x2f0 0x84/0x1f0 0x3d/0x50 creds+0x2f/ 0x40 lookup+ 0xb6/0x190 object_ size+0xaf/ 0x1b0 at_empty+ 0x36/0x40 at_empty+ 0x36/0x40 64+0x73/ 0x130 64_after_ hwframe+ 0x3d/0xa2
[25553.379386] ? ovl_inode_
[25553.379390] ? ovl_lock_
[25553.379396] ovl_get_
[25553.379401] ovl_lookup+
[25553.379406] lookup_
[25553.379409] ? lookup_
[25553.379413] walk_component+
[25553.379416] ? path_init+
[25553.379419] path_lookupat+
[25553.379423] ? __put_cred+
[25553.379426] ? revert_
[25553.379429] filename_
[25553.379434] ? __check_
[25553.379438] user_path_
[25553.379441] ? user_path_
[25553.379444] SyS_chown+0x4d/0xe0
[25553.379449] do_syscall_
[25553.379453] entry_SYSCALL_