root@polyu:~# ls
[   73.589720] [bash 255] copy_creds get_cred(ffff88800eb76d00{1,0})::before
[   73.590789] [bash 255] copy_creds get_cred(ffff88800eb76d00{2,0})::after
[   73.591858] [bash 255] copy_process copy_creds::after, cred ffff88800eb76d00{2}
[   73.596552] [bash 255] copy_process new pid 259, cred ffff88800eb76d00
[   73.602177] [ls 259] commit_creds get_cred(ffff88800fbb7100{1})::before
[   73.603043] [ls 259] commit_creds put_cred(ffff88800eb76d00{4,0})*2::before
[   73.604189] [ls 259] commit_creds put_cred(ffff88800eb76d00{2,0})*2::after
[   73.607905] [ls 259] override_creds get_new_cred(ffff88800fbb6e00{2,1})::after = ffff88800fbb7100{2,1}
[   73.609511] [ls 259] revert_creds(ffff88800fbb7100{2,1}) put_cred(ffff88800fbb6e00{1,1})
[   73.610512] [ls 259] revert_creds destroying cred ffff88800fbb6e00
[   73.616202] [ls 259] override_creds get_new_cred(ffff88800fe8ff00{2,1})::after = ffff88800fbb7100{8,1}
[   73.617355] [ls 259] revert_creds(ffff88800fbb7100{8,1}) put_cred(ffff88800fe8ff00{1,1})
[   73.618364] [ls 259] revert_creds destroying cred ffff88800fe8ff00
mem-leak-prepare_creds-repro.c  repro
root@polyu:~# [   73.645407] [ls 259] exit_creds(ffff88800fbb7100{25,2},ffff88800fbb7100{25,2})::before
[   73.647051] [swapper/2 0] file_free_rcu destroying cred ffff88800eb76d00
[   73.649095] [swapper/2 0] file_free_rcu destroying cred ffff88800fbb7100