From owner-freebsd-bugs  Mon Oct 30 20:59:30 2000
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To: johan@FreeBSD.org
Cc: freebsd-bugs@FreeBSD.org
Subject: Re: kern/2840: mlock+minherit+fork+munlock causes panics or freezes
From: Tor.Egge@fast.no
In-Reply-To: Your message of "Tue, 31 Oct 2000 04:07:46 +0100"
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Date: Tue, 31 Oct 2000 05:59:25 +0100
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> > Hi Tor
> > 
> > Is this still a problem in more recent version of FreeBSD
> > (for example 4.x or current).
> 
> This is still a problem:

Here is a suggested fix.  vmspace_fork() didn't clear the MAP_ENTRY_USER_WIRED
flag on the new map entries.

Index: vm_map.c
===================================================================
RCS file: /home/ncvs/src/sys/vm/vm_map.c,v
retrieving revision 1.191
diff -u -r1.191 vm_map.c
--- vm_map.c	2000/10/04 01:29:17	1.191
+++ vm_map.c	2000/10/31 04:52:44
@@ -2149,6 +2149,7 @@
 			 */
 			new_entry = vm_map_entry_create(new_map);
 			*new_entry = *old_entry;
+			new_entry->eflags &= ~MAP_ENTRY_USER_WIRED;
 			new_entry->wired_count = 0;
 
 			/*
@@ -2175,6 +2176,7 @@
 			 */
 			new_entry = vm_map_entry_create(new_map);
 			*new_entry = *old_entry;
+			new_entry->eflags &= ~MAP_ENTRY_USER_WIRED;
 			new_entry->wired_count = 0;
 			new_entry->object.vm_object = NULL;
 			vm_map_entry_link(new_map, new_map->header.prev,


- Tor Egge


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