svn commit: r309837 - head/contrib/netbsd-tests/lib/libc/sys

[Ngie Cooper]

Author: ngie
Date: Sat Dec 10 22:08:33 2016
New Revision: 309837
URL: https://svnweb.freebsd.org/changeset/base/309837

Log:
  Change the process limits for RLIMIT_MEMLOCK to RLIM_INFINITY when
  executing :mincore_resid
  
  The default process limits in FreeBSD is 64kB for unprivileged users,
  which empirically is too low to run the :mincore_resid testcase.
  
  Process limits are inherited, so even though the default limit for
  root users is RLIM_INFINITY, the inherited limit with "sudo" with the
  default login.conf will be 64kB.
  
  Use setrlimit to set rlim_max for RLIMIT_MEMLOCK to RLIM_INFINITY to
  avoid ENOMEM issues when calling mlock to wire the mmap'ed address
  space.
  
  setrlimit requires root access to increase rlim_max, so require root
  privileges when running the test
  
  Discovered when executing the tests with sudo, e.g.
  "sudo kyua test -k /usr/tests/lib/libc/sys/Kyuafile mincore_test"
  
  MFC after:	2 weeks

Modified:
  head/contrib/netbsd-tests/lib/libc/sys/t_mincore.c

Modified: head/contrib/netbsd-tests/lib/libc/sys/t_mincore.c
==============================================================================
--- head/contrib/netbsd-tests/lib/libc/sys/t_mincore.c	Sat Dec 10 22:05:24 2016	(r309836)
+++ head/contrib/netbsd-tests/lib/libc/sys/t_mincore.c	Sat Dec 10 22:08:33 2016	(r309837)
@@ -144,6 +144,9 @@ ATF_TC_WITH_CLEANUP(mincore_resid);
 ATF_TC_HEAD(mincore_resid, tc)
 {
 	atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)");
+#ifdef __FreeBSD__
+	atf_tc_set_md_var(tc, "require.user", "root");
+#endif
 }
 
 ATF_TC_BODY(mincore_resid, tc)
@@ -155,6 +158,13 @@ ATF_TC_BODY(mincore_resid, tc)
 	struct rlimit rlim;
 
 	ATF_REQUIRE(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
+#ifdef __FreeBSD__
+	/*
+	 * Bump the mlock limit to unlimited so the rest of the testcase
+	 * passes instead of failing on the mlock call.
+	 */
+	rlim.rlim_max = RLIM_INFINITY;
+#endif
 	rlim.rlim_cur = rlim.rlim_max;
 	ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
 
@@ -206,8 +216,9 @@ ATF_TC_BODY(mincore_resid, tc)
 		    "might be low on memory");
 
 #ifdef __FreeBSD__
-	ATF_REQUIRE_MSG(mlock(addr, npgs * page) == 0, "mlock failed: %s",
-	    strerror(errno));
+	if (mlock(addr, npgs * page) == -1 && errno != ENOMEM)
+		atf_tc_skip("could not wire anonymous test area, system might "
+		    "be low on memory");
 #endif
 	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
 	ATF_REQUIRE(munmap(addr, npgs * page) == 0);