There is no -u flag to ulimit provided by Busybox ash, change
to -p in docker.init
bash ulimit:
-n The maximum number of open file descriptors
-u The maximum number of processes available to a single user
ash ulimit (from Busybox):
{ RLIMIT_NOFILE, 0, 'n', "file descriptors" },
{ RLIMIT_NPROC, 0, 'p', "processes" },
References:
428d7337e88db61095a3
