4 * Copyright (c) 2008-2012 Alexander Leidinger <netchild@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
30 * Check if the internal locks are correctly acquired/released:
31 * - no recursive locking (mtx locks, write locks)
32 * - no unlocking of already unlocked one
34 * Print stacktrace if a lock is longer locked than about 10sec or more.
37 #pragma D option dynvarsize=32m
38 #pragma D option specsize=32m
42 check["futex_mtx"] = 0;
45 linuxulator*:locks:futex_mtx:locked
46 /check[probefunc] > 0/
48 printf("ERROR: recursive lock of %s (%p),", probefunc, arg0);
49 printf(" or missing SDT probe in kernel. Stack trace follows:");
53 linuxulator*:locks:futex_mtx:locked
56 @stats[probefunc] = count();
58 ts[probefunc] = timestamp;
59 spec[probefunc] = speculation();
62 linuxulator*:locks:futex_mtx:unlock
63 /check[probefunc] == 0/
65 printf("ERROR: unlock attempt of unlocked %s (%p),", probefunc, arg0);
66 printf(" missing SDT probe in kernel, or dtrace program started");
67 printf(" while the %s was already held (race condition).", probefunc);
68 printf(" Stack trace follows:");
72 linuxulator*:locks:futex_mtx:unlock
74 discard(spec[probefunc]);
79 /* Timeout handling */
82 /spec["futex_mtx"] != 0 && timestamp - ts["futex_mtx"] >= 9999999000/
84 commit(spec["futex_mtx"]);
85 spec["futex_mtx"] = 0;
93 printf("Number of locks per type:");