Date: Sat, 11 Dec 1999 11:42:45 -0800 (PST) From: mitja@ksop-cscp.si To: freebsd-gnats-submit@freebsd.org Subject: kern/15420: 3.3-RELEASE Kernel freeze Message-ID: <19991211194245.1614414D16@hub.freebsd.org>
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>Number: 15420
>Category: kern
>Synopsis: 3.3-RELEASE Kernel freeze
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Dec 11 11:50:01 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Mitja Horvat
>Release: 3.3-RELEASE
>Organization:
>Environment:
FreeBSD weha.nonet.si 3.3-RELEASE FreeBSD 3.3-RELEASE #7: Thu Dec 9 00:21:47 CET 1999 root@weha.nonet.si:/usr/src/sys/compile/WOW i386
>Description:
Kernel freezes under heavy VM load.
>How-To-Repeat:
Spawn few programs that chew up all memory.
The bug may not show up immediately, so run the programs few times.
This script triggers the problem on two PCs I tested on:
--------------------------------->8--------------------------------
#!/bin/sh
cat << EOF > qq.c
void main(void) {
for(;;)
memset(malloc(1000000), 0, 1000000);
}
EOF
cc qq.c -o qq
./qq &
./qq &
./qq &
./qq &
wait
rm -f qq qq.c
--------------------------------->8--------------------------------
>Fix:
The following kernel patch fixes the problem for me, but since this is my
first FreeBSD hacking attempt, I'm not sure if it's OK.
--------------------------------->8--------------------------------
--- vm_pageout.c.orig Fri Dec 10 01:49:54 1999
+++ vm_pageout.c Fri Dec 10 01:54:22 1999
@@ -1136,8 +1136,8 @@
* make sure that we have swap space -- if we are low on memory and
* swap -- then kill the biggest process.
*/
- if ((vm_swap_size == 0 || swap_pager_full) &&
- ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min)) {
+ if (vm_swap_size == 0 || swap_pager_full ||
+ (cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min) {
bigproc = NULL;
bigsize = 0;
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
--------------------------------->8--------------------------------
>Release-Note:
>Audit-Trail:
>Unformatted:
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