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.
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
36 * Print stacktrace if a lock is longer locked than about 10sec or more.
39 #pragma D option dynvarsize=32m
40 #pragma D option specsize=32m
44 check["futex_mtx"] = 0;
47 linuxulator*:locks:futex_mtx:locked
48 /check[probefunc] > 0/
50 printf("ERROR: recursive lock of %s (%p),", probefunc, arg0);
51 printf(" or missing SDT probe in kernel. Stack trace follows:");
55 linuxulator*:locks:futex_mtx:locked
58 @stats[probefunc] = count();
60 ts[probefunc] = timestamp;
61 spec[probefunc] = speculation();
64 linuxulator*:locks:futex_mtx:unlock
65 /check[probefunc] == 0/
67 printf("ERROR: unlock attempt of unlocked %s (%p),", probefunc, arg0);
68 printf(" missing SDT probe in kernel, or dtrace program started");
69 printf(" while the %s was already held (race condition).", probefunc);
70 printf(" Stack trace follows:");
74 linuxulator*:locks:futex_mtx:unlock
76 discard(spec[probefunc]);
81 /* Timeout handling */
84 /spec["futex_mtx"] != 0 && timestamp - ts["futex_mtx"] >= 9999999000/
86 commit(spec["futex_mtx"]);
87 spec["futex_mtx"] = 0;
95 printf("Number of locks per type:");