On Sat, Aug 12, 2023 at 07:51:43PM +0200, Alejandro Colomar wrote: > Does this depend on any recent kernel version? In my system, > the assertion fails. > > > $ cat clone.c > ... > > $ cc -Wall -Wextra clone.c > $ ./a.out > main program: pid: 18783, and ppid: 18703 > a.out: clone.c:24: main: Assertion `ret != -1' failed. > Aborted On my systerm I get the same result. strace says this: clone3({flags=CLONE_PARENT|CLONE_NEWPID, exit_signal=0, stack=NULL, stack_size=0}, 88) = -1 EPERM (Operation not permitted) However when running as root it works. John.