The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/check_internal_locks.d

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    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 
   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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