flock hangs

[DUOLabs333]

While this issue was discovered when trying to debug #91, this is not related to that issue.

If flock is run on a file in an NFS mount, the program hangs.
(Unlike #91, there's a reproducer)

#include <fcntl.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
int main(int argc, char** argv){
	int fd=openat(AT_FDCWD, "test_mount/tmp/gopls-diff-stats-2599980011", O_RDWR);
	printf("%s\n",strerror(errno));
	flock(fd,LOCK_EX);
}

[DUOLabs333]

Using nolock solved this.

[willscott]

nolock as a mount option, you mean?

[DUOLabs333]

Yes.