Author: kib
Date: Mon Jun 19 20:40:59 2017
New Revision: 320121
URL: https://svnweb.freebsd.org/changeset/base/320121
Log:
Ignore the P_SYSTEM process flag, and do not request
VM_MAP_WIRE_SYSTEM mode when wiring the newly grown stack.
System maps do not create auto-grown stack. Any stack we handled,
even for P_SYSTEM, must be for user address space. P_SYSTEM processes
with mapped user space is either init(8) or an aio worker attached to
other user process with aio buffer pointing into stack area. In either
case, VM_MAP_WIRE_USER mode should be used.
Noted and reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/vm/vm_map.c
Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c Mon Jun 19 19:27:37 2017 (r320120)
+++ head/sys/vm/vm_map.c Mon Jun 19 20:40:59 2017 (r320121)
@@ -3891,9 +3891,7 @@ Retry:
vm_map_wire(map,
(stack_entry == next_entry) ? addr : addr - grow_amount,
(stack_entry == next_entry) ? stack_entry->start : addr,
- (p->p_flag & P_SYSTEM)
- ? VM_MAP_WIRE_SYSTEM|VM_MAP_WIRE_NOHOLES
- : VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
+ VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
}
out:
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