D19252.diff
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	Index: head/sys/kern/kern_kcov.c
	===================================================================
	--- head/sys/kern/kern_kcov.c
	+++ head/sys/kern/kern_kcov.c
	@@ -58,6 +58,7 @@
	#include <vm/vm_object.h>
	#include <vm/vm_page.h>
	#include <vm/vm_pager.h>
	+#include <vm/vm_param.h>

	MALLOC_DEFINE(M_KCOV_INFO, "kcovinfo", "KCOV info type");

	@@ -347,6 +348,7 @@
	info->mmap != false)
	return (EINVAL);

	+ vm_object_reference(info->bufobj);
	info->mmap = true;
	*offset = 0;
	*object = info->bufobj;
	@@ -393,13 +395,26 @@
	static void
	kcov_free(struct kcov_info *info)
	{
	+ vm_page_t m;
	+ size_t i;

	if (info->kvaddr != 0) {
	pmap_qremove(info->kvaddr, info->bufsize / PAGE_SIZE);
	kva_free(info->kvaddr, info->bufsize);
	}
	- if (info->bufobj != NULL && !info->mmap)
	+ if (info->bufobj != NULL) {
	+ VM_OBJECT_WLOCK(info->bufobj);
	+ m = vm_page_lookup(info->bufobj, 0);
	+ for (i = 0; i < info->bufsize / PAGE_SIZE; i++) {
	+ vm_page_lock(m);
	+ vm_page_unwire_noq(m);
	+ vm_page_unlock(m);
	+
	+ m = vm_page_next(m);
	+ }
	+ VM_OBJECT_WUNLOCK(info->bufobj);
	vm_object_deallocate(info->bufobj);
	+ }
	free(info, M_KCOV_INFO);
	}