Console output on sun4v

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

I'm running the following custom init process in sun4v LDOM with
NetBSD-11

#include <fcntl.h>
#include <unistd.h>

int main(void)
{
	int fd;

	fd = open("/dev/console", O_WRONLY);
	if (fd != 1) {
		dup2(fd, 1);
		close(fd);
	}

	while (1)
	{
		write(STDOUT_FILENO, "test\n", 5);
		sleep(2);
	}
}

But write() syscalls return error:

[   2.1132573] init path (default /sbin/init): /myinit
[   4.0965763] init: copying out path `/myinit' 8
...
[  70.5317095] proc 1 (myinit): netbsd num 4 call: write(0x1, 0x1921d8, 0x5)
[  70.5317095] proc 1 (myinit): netbsd num 4 ret write: err = 9, rv = 0x0,0x0
[  70.5317095] proc 1 (myinit): netbsd num 430 call: __nanosleep50(0xffffffffffffd7a0, 0xffffffffffffd7b0)

Same code works correctly on sun4u NetBSD-9.4

Any idea if the errors are related to unfinished console drivers for
sun4v or something else?