98 lines
2.8 KiB
D
98 lines
2.8 KiB
D
#!/usr/sbin/dtrace -qs
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/*-
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* Copyright (c) 2008-2012 Alexander Leidinger <netchild@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/**
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* Check if the internal locks are correctly acquired/released:
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* - no recursive locking (mtx locks, write locks)
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* - no unlocking of already unlocked one
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*
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* Print stacktrace if a lock is longer locked than about 10sec or more.
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*/
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#pragma D option dynvarsize=32m
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#pragma D option specsize=32m
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BEGIN
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{
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check["futex_mtx"] = 0;
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}
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linuxulator*:locks:futex_mtx:locked
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/check[probefunc] > 0/
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{
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printf("ERROR: recursive lock of %s (%p),", probefunc, arg0);
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printf(" or missing SDT probe in kernel. Stack trace follows:");
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stack();
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}
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linuxulator*:locks:futex_mtx:locked
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{
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++check[probefunc];
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@stats[probefunc] = count();
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ts[probefunc] = timestamp;
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spec[probefunc] = speculation();
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}
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linuxulator*:locks:futex_mtx:unlock
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/check[probefunc] == 0/
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{
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printf("ERROR: unlock attempt of unlocked %s (%p),", probefunc, arg0);
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printf(" missing SDT probe in kernel, or dtrace program started");
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printf(" while the %s was already held (race condition).", probefunc);
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printf(" Stack trace follows:");
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stack();
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}
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linuxulator*:locks:futex_mtx:unlock
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{
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discard(spec[probefunc]);
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spec[probefunc] = 0;
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--check[probefunc];
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}
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/* Timeout handling */
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tick-10s
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/spec["futex_mtx"] != 0 && timestamp - ts["futex_mtx"] >= 9999999000/
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{
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commit(spec["futex_mtx"]);
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spec["futex_mtx"] = 0;
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}
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/* Statistics */
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END
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{
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printf("Number of locks per type:");
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printa(@stats);
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}
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