svn commit: r302996 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Mon Jul 18 09:19:45 2016
New Revision: 302996
URL: https://svnweb.freebsd.org/changeset/base/302996

Log:
  Added a regression test.
  
  Sponsored by:	EMC / Isilon Storage Division

Added:
  user/pho/stress2/misc/ptrace8.sh   (contents, props changed)

Added: user/pho/stress2/misc/ptrace8.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/ptrace8.sh	Mon Jul 18 09:19:45 2016	(r302996)
@@ -0,0 +1,124 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2016 EMC Corp.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+# A regression test for r302919.
+# Triggered a witness message:
+#
+# vmspace_free() called with the following non-sleepable locks held:
+# shared rw vm object (vm object) r = 0 locked @ kern/sys_process.c:432
+
+. ../default.cfg
+
+dir=/tmp
+odir=`pwd`
+cd $dir
+sed '1,/^EOF/d' < $odir/$0 > $dir/ptrace8.c
+mycc -o ptrace8 -Wall -Wextra -O0 -g ptrace8.c || exit 1
+rm -f ptrace8.c
+cd $odir
+
+/tmp/ptrace8
+s=$?
+
+rm -rf /tmp/ptrace8
+exit $s
+
+EOF
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include <machine/atomic.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+volatile u_int *share;
+
+#define SYNC 0
+
+int
+main(void)
+{
+	struct ptrace_vm_entry ent;
+	size_t len;
+	int pid, r, status;
+	char path[MAXPATHLEN + 1];
+
+	len = PAGE_SIZE;
+	if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE,
+	    MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED)
+		err(1, "mmap");
+
+	if ((pid = fork()) == 0) {
+		while (share[SYNC] == 0)
+			sleep(1);
+
+		_exit(0);
+	}
+
+	if (ptrace(PT_ATTACH, pid, 0, 0) == -1)
+		err(1, "ptrace");
+
+	if (waitpid(pid, &status, 0) == -1)
+		err(1, "waitpid");
+	else if (!WIFSTOPPED(status))
+		errx(1, "failed to stop child");
+
+	ent.pve_entry = 0;
+	ent.pve_path = path;
+	ent.pve_pathlen = sizeof(path);
+	do {
+		r = ptrace(PT_VM_ENTRY, pid, (caddr_t)&ent, 0);
+#if defined(DEBUG)
+		if (r == 0)
+			fprintf(stderr, "path = %s 0x%lx - 0x%lx\n",
+			    ent.pve_path, ent.pve_start, ent.pve_end);
+#endif
+	} while (r == 0);
+	if (r == -1 && errno != ENOENT)
+		err(1, "ptrace(PT_VM_ENTRY)");
+
+	share[SYNC] = 1;
+	if (ptrace(PT_DETACH, pid, 0, 0) == -1)
+		err(1, "ptrace");
+
+	if (waitpid(pid, &status, 0) == -1)
+		err(1, "waitpid(%d)", pid);
+
+	return (status != 0);
+}