Kornilios Kourtis
7ac58157ca
In some kernels (specifically, 5.4) even though the clone3 syscall is supported, setting CLONE_INTO_CGROUP is not. The error message returned in this case is E2BIG. If posix_spawn_wrapper encounters this error, it does not retry, and cannot spawn any programs in said kernels. This commit adds a check for the E2BIG error and retries pidfd_spawn() without the POSIX_SPAWN_SETCGROUP flag. If we encounter an E2BIG error, and the pidfd_spawn() succeeds after removing the POSIX_SPAWN_SETCGROUP flag, then we cache the result so that we do not retry every time. Originally, this issue was reported in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1077204. Signed-off-by: Kornilios Kourtis <kornilios@gmail.com>
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