From 905837ebe7ddd65e5d5cd362c210ce55633b0aff Mon Sep 17 00:00:00 2001
From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Wed, 14 Nov 2018 19:10:35 +0000
Subject: [PATCH] Initialize compatibility epoch tracker for thread0. Fixes
 panics for drivers that call if_maddr_lock() during startup.

Reported by:	cy
---
 sys/kern/init_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 79a625b7900f..402836d5e702 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -52,6 +52,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/kernel.h>
+#include <sys/epoch.h>
 #include <sys/exec.h>
 #include <sys/file.h>
 #include <sys/filedesc.h>
@@ -510,6 +511,7 @@ proc0_init(void *dummy __unused)
 	td->td_pflags = TDP_KTHREAD;
 	td->td_cpuset = cpuset_thread0();
 	td->td_domain.dr_policy = td->td_cpuset->cs_domain;
+	epoch_thread_init(td);
 	prison0_init();
 	p->p_peers = 0;
 	p->p_leader = p;