t_renamerace.c revision 1.8 
1/*	$NetBSD: t_renamerace.c,v 1.8 2010/07/14 21:39:31 pooka Exp $	*/
2
3/*
4 * Modified for rump and atf from a program supplied
5 * by Nicolas Joly in kern/40948
6 */
7
8#include <sys/types.h>
9#include <sys/mount.h>
10#include <sys/utsname.h>
11
12#include <atf-c.h>
13#include <errno.h>
14#include <fcntl.h>
15#include <pthread.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <string.h>
19#include <unistd.h>
20
21#include <rump/rump.h>
22#include <rump/rump_syscalls.h>
23
24#include <fs/tmpfs/tmpfs_args.h>
25
26#include "../../h_macros.h"
27
28ATF_TC(renamerace2);
29ATF_TC_HEAD(renamerace2, tc)
30{
31	atf_tc_set_md_var(tc, "descr", "rename(2) lock order inversion");
32	atf_tc_set_md_var(tc, "timeout", "6");
33}
34
35static volatile int quittingtime = 0;
36
37static void *
38r2w1(void *arg)
39{
40	int fd;
41
42	rump_pub_lwp_alloc_and_switch(0, 0);
43
44	fd = rump_sys_open("/file", O_CREAT | O_RDWR, 0777);
45	if (fd == -1)
46		atf_tc_fail_errno("creat");
47	rump_sys_close(fd);
48
49	while (!quittingtime) {
50		if (rump_sys_rename("/file", "/dir/file") == -1)
51			atf_tc_fail_errno("rename 1");
52		if (rump_sys_rename("/dir/file", "/file") == -1)
53			atf_tc_fail_errno("rename 2");
54	}
55
56	return NULL;
57}
58
59static void *
60r2w2(void *arg)
61{
62	int fd;
63
64	rump_pub_lwp_alloc_and_switch(0, 0);
65
66	while (!quittingtime) {
67		fd = rump_sys_open("/dir/file1", O_RDWR);
68		if (fd != -1)
69			rump_sys_close(fd);
70	}
71
72	return NULL;
73}
74
75ATF_TC_BODY(renamerace2, tc)
76{
77	struct tmpfs_args args;
78	struct utsname un;
79	pthread_t pt[2];
80
81	/*
82	 * Check that we are running on an SMP-capable arch.  It should
83	 * be a rump capability, but after the CPU_INFO_FOREACH is
84	 * fixed, it will be every arch (for rump), so don't bother.
85	 */
86	if (uname(&un) == -1)
87		atf_tc_fail_errno("uname");
88	if (strcmp(un.machine, "i386") != 0 && strcmp(un.machine, "amd64") != 0)
89		atf_tc_skip("i386 or amd64 required (have %s)", un.machine);
90
91	/*
92	 * Force SMP regardless of how many host CPUs there are.
93	 * Deadlock is highly unlikely to trigger otherwise.
94	 */
95	setenv("RUMP_NCPU", "2", 1);
96
97	rump_init();
98	memset(&args, 0, sizeof(args));
99	args.ta_version = TMPFS_ARGS_VERSION;
100	args.ta_root_mode = 0777;
101	if (rump_sys_mount(MOUNT_TMPFS, "/", 0, &args, sizeof(args)) == -1)
102		atf_tc_fail_errno("could not mount tmpfs");
103
104	if (rump_sys_mkdir("/dir", 0777) == -1)
105		atf_tc_fail_errno("cannot create directory");
106
107	pthread_create(&pt[0], NULL, r2w1, NULL);
108	pthread_create(&pt[1], NULL, r2w2, NULL);
109
110	/* usually triggers in <<1s for me */
111	sleep(4);
112	quittingtime = 1;
113
114	atf_tc_expect_timeout("PR kern/36681");
115
116	pthread_join(pt[0], NULL);
117	pthread_join(pt[1], NULL);
118}
119
120ATF_TP_ADD_TCS(tp)
121{
122	ATF_TP_ADD_TC(tp, renamerace2);
123
124	return atf_no_error();
125}
126