1 /* $NetBSD: t_renamerace.c,v 1.15 2020/06/26 07:50:12 jruoho Exp $ */
2
3 /*
4 * Modified for rump and atf from a program supplied
5 * by Nicolas Joly in PR 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
28 ATF_TC(renamerace2);
ATF_TC_HEAD(renamerace2,tc)29 ATF_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
35 static volatile int quittingtime = 0;
36 static pid_t wrkpid;
37
38 static void *
r2w1(void * arg)39 r2w1(void *arg)
40 {
41 int fd;
42
43 rump_pub_lwproc_newlwp(wrkpid);
44
45 fd = rump_sys_open("/file", O_CREAT | O_RDWR, 0777);
46 if (fd == -1)
47 atf_tc_fail_errno("creat");
48 rump_sys_close(fd);
49
50 while (!quittingtime) {
51 if (rump_sys_rename("/file", "/dir/file") == -1)
52 atf_tc_fail_errno("rename 1");
53 if (rump_sys_rename("/dir/file", "/file") == -1)
54 atf_tc_fail_errno("rename 2");
55 }
56
57 return NULL;
58 }
59
60 static void *
r2w2(void * arg)61 r2w2(void *arg)
62 {
63 int fd;
64
65 rump_pub_lwproc_newlwp(wrkpid);
66
67 while (!quittingtime) {
68 fd = rump_sys_open("/dir/file1", O_RDWR);
69 if (fd != -1)
70 rump_sys_close(fd);
71 }
72
73 return NULL;
74 }
75
ATF_TC_BODY(renamerace2,tc)76 ATF_TC_BODY(renamerace2, tc)
77 {
78 struct tmpfs_args args;
79 pthread_t pt[2];
80
81 /*
82 * Force SMP regardless of how many host CPUs there are.
83 * Deadlock is highly unlikely to trigger otherwise.
84 */
85 setenv("RUMP_NCPU", "2", 1);
86
87 rump_init();
88 memset(&args, 0, sizeof(args));
89 args.ta_version = TMPFS_ARGS_VERSION;
90 args.ta_root_mode = 0777;
91 if (rump_sys_mount(MOUNT_TMPFS, "/", 0, &args, sizeof(args)) == -1)
92 atf_tc_fail_errno("could not mount tmpfs");
93
94 if (rump_sys_mkdir("/dir", 0777) == -1)
95 atf_tc_fail_errno("cannot create directory");
96
97 RZ(rump_pub_lwproc_rfork(RUMP_RFCFDG));
98 RL(wrkpid = rump_sys_getpid());
99 pthread_create(&pt[0], NULL, r2w1, NULL);
100 pthread_create(&pt[1], NULL, r2w2, NULL);
101
102 /* usually triggers in <<1s for me */
103 sleep(4);
104 quittingtime = 1;
105
106 pthread_join(pt[0], NULL);
107 pthread_join(pt[1], NULL);
108 }
109
ATF_TP_ADD_TCS(tp)110 ATF_TP_ADD_TCS(tp)
111 {
112 ATF_TP_ADD_TC(tp, renamerace2);
113
114 return atf_no_error();
115 }
116