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kcmp is often missing: https://man7.org/linux/man-pages/man2/kcmp.2.html > Before Linux 5.12, this system call is available only if the > kernel is configured with CONFIG_CHECKPOINT_RESTORE, since the > original purpose of the system call was for the > checkpoint/restore in user space (CRIU) feature. (The > alternative to this system call would have been to expose > suitable process information via the proc(5) filesystem; this was > deemed to be unsuitable for security reasons.) Since Linux 5.12, > this system call is also available if the kernel is configured > with CONFIG_KCMP. Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>