1 #!/usr/sbin/dtrace -qs
2
3 /*-
4 * Copyright (c) 2008-2012 Alexander Leidinger <netchild@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: releng/10.0/sys/compat/linux/check_internal_locks.d 235063 2012-05-05 19:42:38Z netchild $
29 */
30
31 /**
32 * Check if the internal locks are correctly acquired/released:
33 * - no recursive locking (mtx locks, write locks)
34 * - no unlocking of already unlocked one
35 *
36 * Print stacktrace if a lock is longer locked than about 10sec or more.
37 */
38
39 #pragma D option dynvarsize=32m
40 #pragma D option specsize=32m
41
42 BEGIN
43 {
44 check["emul_lock"] = 0;
45 check["emul_shared_rlock"] = 0;
46 check["emul_shared_wlock"] = 0;
47 check["futex_mtx"] = 0;
48 }
49
50 linuxulator*:locks:emul_lock:locked,
51 linuxulator*:locks:emul_shared_wlock:locked,
52 linuxulator*:locks:futex_mtx:locked
53 /check[probefunc] > 0/
54 {
55 printf("ERROR: recursive lock of %s (%p),", probefunc, arg0);
56 printf(" or missing SDT probe in kernel. Stack trace follows:");
57 stack();
58 }
59
60 linuxulator*:locks:emul_lock:locked,
61 linuxulator*:locks:emul_shared_rlock:locked,
62 linuxulator*:locks:emul_shared_wlock:locked,
63 linuxulator*:locks:futex_mtx:locked
64 {
65 ++check[probefunc];
66 @stats[probefunc] = count();
67
68 ts[probefunc] = timestamp;
69 spec[probefunc] = speculation();
70 }
71
72 linuxulator*:locks:emul_lock:unlock,
73 linuxulator*:locks:emul_shared_rlock:unlock,
74 linuxulator*:locks:emul_shared_wlock:unlock,
75 linuxulator*:locks:futex_mtx:unlock
76 /check[probefunc] == 0/
77 {
78 printf("ERROR: unlock attemt of unlocked %s (%p),", probefunc, arg0);
79 printf(" missing SDT probe in kernel, or dtrace program started");
80 printf(" while the %s was already held (race condition).", probefunc);
81 printf(" Stack trace follows:");
82 stack();
83 }
84
85 linuxulator*:locks:emul_lock:unlock,
86 linuxulator*:locks:emul_shared_rlock:unlock,
87 linuxulator*:locks:emul_shared_wlock:unlock,
88 linuxulator*:locks:futex_mtx:unlock
89 {
90 discard(spec[probefunc]);
91 spec[probefunc] = 0;
92 --check[probefunc];
93 }
94
95 /* Timeout handling */
96
97 tick-10s
98 /spec["emul_lock"] != 0 && timestamp - ts["emul_lock"] >= 9999999000/
99 {
100 commit(spec["emul_lock"]);
101 spec["emul_lock"] = 0;
102 }
103
104 tick-10s
105 /spec["emul_shared_wlock"] != 0 && timestamp - ts["emul_shared_wlock"] >= 9999999000/
106 {
107 commit(spec["emul_shared_wlock"]);
108 spec["emul_shared_wlock"] = 0;
109 }
110
111 tick-10s
112 /spec["emul_shared_rlock"] != 0 && timestamp - ts["emul_shared_rlock"] >= 9999999000/
113 {
114 commit(spec["emul_shared_rlock"]);
115 spec["emul_shared_rlock"] = 0;
116 }
117
118 tick-10s
119 /spec["futex_mtx"] != 0 && timestamp - ts["futex_mtx"] >= 9999999000/
120 {
121 commit(spec["futex_mtx"]);
122 spec["futex_mtx"] = 0;
123 }
124
125
126 /* Statistics */
127
128 END
129 {
130 printf("Number of locks per type:");
131 printa(@stats);
132 }
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