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/10.2/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 42BEGIN 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 50linuxulator*:locks:emul_lock:locked, 51linuxulator*:locks:emul_shared_wlock:locked, 52linuxulator*: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 60linuxulator*:locks:emul_lock:locked, 61linuxulator*:locks:emul_shared_rlock:locked, 62linuxulator*:locks:emul_shared_wlock:locked, 63linuxulator*:locks:futex_mtx:locked 64{ 65 ++check[probefunc]; 66 @stats[probefunc] = count(); 67 68 ts[probefunc] = timestamp; 69 spec[probefunc] = speculation(); 70} 71 72linuxulator*:locks:emul_lock:unlock, 73linuxulator*:locks:emul_shared_rlock:unlock, 74linuxulator*:locks:emul_shared_wlock:unlock, 75linuxulator*: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 85linuxulator*:locks:emul_lock:unlock, 86linuxulator*:locks:emul_shared_rlock:unlock, 87linuxulator*:locks:emul_shared_wlock:unlock, 88linuxulator*:locks:futex_mtx:unlock 89{ 90 discard(spec[probefunc]); 91 spec[probefunc] = 0; 92 --check[probefunc]; 93} 94 95/* Timeout handling */ 96 97tick-10s 98/spec["emul_lock"] != 0 && timestamp - ts["emul_lock"] >= 9999999000/ 99{ 100 commit(spec["emul_lock"]); 101 spec["emul_lock"] = 0; 102} 103 104tick-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 111tick-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 118tick-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 128END 129{ 130 printf("Number of locks per type:"); 131 printa(@stats); 132} 133