[src/trunk]: src/tests/net tests: restore rump_server_check_poolleaks for lle...

[ozaki-r <ozaki-r%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/44789e0eda8c
branches:  trunk
changeset: 459138:44789e0eda8c
user:      ozaki-r <ozaki-r%NetBSD.org@localhost>
date:      Mon Aug 26 04:50:03 2019 +0000

description:
tests: restore rump_server_check_poolleaks for llentpl

It didn't work correctly because rumphijack for vmstat didn't work expectedly;
vmstat has the sgid bit for kvm(3) and that prevents rumphijack from working.

Address the issue by cloning a vmstat binary without the sgid bit temporarily
and using it for rumphijack.  Note that it's a workaround.  vmstat should stop
using kvm(3) for /dev/kmem and drop the sgid bit eventually.

diffstat:

 tests/net/net_common.sh |  19 +++++++++++++------
 1 files changed, 13 insertions(+), 6 deletions(-)

diffs (47 lines):

diff -r abc873b6c5d3 -r 44789e0eda8c tests/net/net_common.sh
--- a/tests/net/net_common.sh   Mon Aug 26 04:49:45 2019 +0000
+++ b/tests/net/net_common.sh   Mon Aug 26 04:50:03 2019 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: net_common.sh,v 1.35 2019/08/20 09:53:45 ozaki-r Exp $
+#      $NetBSD: net_common.sh,v 1.36 2019/08/26 04:50:03 ozaki-r Exp $
 #
 # Copyright (c) 2016 Internet Initiative Japan Inc.
 # All rights reserved.
@@ -341,8 +341,13 @@
 {
        local target=$1
 
-       reqs=$($HIJACKING vmstat -mv | awk "/$target/ {print \$3;}")
-       rels=$($HIJACKING vmstat -mv | awk "/$target/ {print \$5;}")
+       # XXX rumphijack doesn't work with a binary with suid/sgid bits like
+       # vmstat.  Use a copied one to drop sgid bit as a workaround until
+       # vmstat stops using kvm(3) for /dev/kmem and the sgid bit.
+       cp /usr/bin/vmstat ./vmstat
+       reqs=$($HIJACKING ./vmstat -mv | awk "/$target/ {print \$3;}")
+       rels=$($HIJACKING ./vmstat -mv | awk "/$target/ {print \$5;}")
+       rm -f ./vmstat
        atf_check_equal '$target$reqs' '$target$rels'
 }
 
@@ -350,8 +355,7 @@
 rump_server_check_memleaks()
 {
 
-       # XXX this doesn't work in some cases for unknown reasons
-       #rump_server_check_poolleaks llentrypl
+       rump_server_check_poolleaks llentrypl
        # This doesn't work for objects allocated through pool_cache
        #rump_server_check_poolleaks mbpl
        #rump_server_check_poolleaks mclpl
@@ -437,7 +441,10 @@
        rump.netstat -nr
        # XXX still need hijacking
        $HIJACKING rump.netstat -nai
-       $HIJACKING vmstat -m
+       # XXX workaround for vmstat with the sgid bit
+       cp /usr/bin/vmstat ./vmstat
+       $HIJACKING ./vmstat -m
+       rm -f ./vmstat
        rump.arp -na
        rump.ndp -na
        $HIJACKING ifmcstat