I've set up nginx to use pam authentication. It worked until I upgraded from about ~2 years old nixpkgs to a recent unstable commit. In nginx logs I'm seeing things like:

`Process 8345 (unix_chkpwd) of user 60 dumped core.`
`pam_unix(nginx:auth): unix_chkpwd abnormal exit: 134`

Any ideas what could be the issue? I've been searching the internet and reading nixpkgs but quite lost, don't know where to even look..