It appears to be an error in command "btrfs receive -f $TMP/incremental.send $MNT" [1]
This command will return 1 and complains about: "ERROR: rmdir o259-6-0 failed. No such file or directory"
[1] https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/tree/ubuntu_btrfs_kernel_fixes/fixes/29d6d30f5c8aa58b04f40a58442df3bcaae5a1d5.sh#n39
It appears to be an error in command "btrfs receive -f $TMP/incrementa l.send $MNT" [1]
This command will return 1 and complains about:
"ERROR: rmdir o259-6-0 failed. No such file or directory"
[1] https:/ /kernel. ubuntu. com/git/ ubuntu/ autotest- client- tests.git/ tree/ubuntu_ btrfs_kernel_ fixes/fixes/ 29d6d30f5c8aa58 b04f40a58442df3 bcaae5a1d5. sh#n39