Okay, that's very helpful. It looks like privsep-helper is segfaulting in libnetfilter_conntrack:
privsep-helper[2985]: segfault at 78001b60 ip 00007f97775e70b6 sp 00007f977c98a468 error 6 in libnetfilter_conntrack.so.3.7.0[7f97775de000+1e000]
That kills the privsep daemon and all subsequent calls fail with the broken pipe error.
Okay, that's very helpful. It looks like privsep-helper is segfaulting in libnetfilter_ conntrack:
privsep- helper[ 2985]: segfault at 78001b60 ip 00007f97775e70b6 sp 00007f977c98a468 error 6 in libnetfilter_ conntrack. so.3.7. 0[7f97775de000+ 1e000]
That kills the privsep daemon and all subsequent calls fail with the broken pipe error.