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I created simple program calling setrlimit and it succeeds.
I confirmed setrlimit argument is exactly same.
It's very curious why same Python code fails...
== c code
#include <sys/resource.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
 struct rlimit rl;
 int err;
 err = getrlimit(RLIMIT_STACK, &rl);
 if (err < 0) {
 perror("getrlimit");
 return err;
 }
 printf("%d, soft=%llu, hard=%llu\n", RLIMIT_STACK, rl.rlim_cur, rl.rlim_max);
 err = setrlimit(RLIMIT_STACK, &rl);
 if (err < 0) {
 perror("setrlimit");
 return err;
 }
 return 0;
}
== Python code
import resource
soft, hard = resource.getrlimit(resource.RLIMIT_STACK)
print("limits=", soft, hard)
resource.setrlimit(resource.RLIMIT_STACK, (soft, hard))
== fails
Traceback (most recent call last):
 File "x.py", line 4, in <module>
 resource.setrlimit(resource.RLIMIT_STACK, (soft, hard))
ValueError: current limit exceeds maximum limit