kern_shutdown.c

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    1 /*-
    2  * Copyright (c) 1986, 1988, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)kern_shutdown.c     8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD$");
   39 
   40 #include "opt_ddb.h"
   41 #include "opt_kdb.h"
   42 #include "opt_mac.h"
   43 #include "opt_panic.h"
   44 #include "opt_show_busybufs.h"
   45 #include "opt_sched.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/bio.h>
   50 #include <sys/buf.h>
   51 #include <sys/conf.h>
   52 #include <sys/cons.h>
   53 #include <sys/eventhandler.h>
   54 #include <sys/kdb.h>
   55 #include <sys/kernel.h>
   56 #include <sys/kthread.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mount.h>
   59 #include <sys/priv.h>
   60 #include <sys/proc.h>
   61 #include <sys/reboot.h>
   62 #include <sys/resourcevar.h>
   63 #include <sys/sched.h>
   64 #include <sys/smp.h>            /* smp_active */
   65 #include <sys/sysctl.h>
   66 #include <sys/sysproto.h>
   67 
   68 #include <ddb/ddb.h>
   69 
   70 #include <machine/cpu.h>
   71 #include <machine/pcb.h>
   72 #include <machine/smp.h>
   73 
   74 #include <security/mac/mac_framework.h>
   75 
   76 #include <vm/vm.h>
   77 #include <vm/vm_object.h>
   78 #include <vm/vm_page.h>
   79 #include <vm/vm_pager.h>
   80 #include <vm/swap_pager.h>
   81 
   82 #include <sys/signalvar.h>
   83 
   84 #ifndef PANIC_REBOOT_WAIT_TIME
   85 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
   86 #endif
   87 
   88 /*
   89  * Note that stdarg.h and the ANSI style va_start macro is used for both
   90  * ANSI and traditional C compilers.
   91  */
   92 #include <machine/stdarg.h>
   93 
   94 #ifdef KDB
   95 #ifdef KDB_UNATTENDED
   96 int debugger_on_panic = 0;
   97 #else
   98 int debugger_on_panic = 1;
   99 #endif
  100 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
  101         &debugger_on_panic, 0, "Run debugger on kernel panic");
  102 
  103 #ifdef KDB_TRACE
  104 int trace_on_panic = 1;
  105 #else
  106 int trace_on_panic = 0;
  107 #endif
  108 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW,
  109         &trace_on_panic, 0, "Print stack trace on kernel panic");
  110 #endif /* KDB */
  111 
  112 int sync_on_panic = 0;
  113 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW,
  114         &sync_on_panic, 0, "Do a sync before rebooting from a panic");
  115 
  116 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
  117 
  118 /*
  119  * Variable panicstr contains argument to first call to panic; used as flag
  120  * to indicate that the kernel has already called panic.
  121  */
  122 const char *panicstr;
  123 
  124 int dumping;                            /* system is dumping */
  125 int rebooting;                          /* system is rebooting */
  126 static struct dumperinfo dumper;        /* our selected dumper */
  127 
  128 /* Context information for dump-debuggers. */
  129 static struct pcb dumppcb;              /* Registers. */
  130 static lwpid_t dumptid;                 /* Thread ID. */
  131 
  132 static void boot(int) __dead2;
  133 static void poweroff_wait(void *, int);
  134 static void shutdown_halt(void *junk, int howto);
  135 static void shutdown_panic(void *junk, int howto);
  136 static void shutdown_reset(void *junk, int howto);
  137 
  138 /* register various local shutdown events */
  139 static void
  140 shutdown_conf(void *unused)
  141 {
  142 
  143         EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
  144             SHUTDOWN_PRI_FIRST);
  145         EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
  146             SHUTDOWN_PRI_LAST + 100);
  147         EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
  148             SHUTDOWN_PRI_LAST + 100);
  149         EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
  150             SHUTDOWN_PRI_LAST + 200);
  151 }
  152 
  153 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
  154 
  155 /*
  156  * The system call that results in a reboot.
  157  */
  158 /* ARGSUSED */
  159 int
  160 reboot(struct thread *td, struct reboot_args *uap)
  161 {
  162         int error;
  163 
  164         error = 0;
  165 #ifdef MAC
  166         error = mac_check_system_reboot(td->td_ucred, uap->opt);
  167 #endif
  168         if (error == 0)
  169                 error = priv_check(td, PRIV_REBOOT);
  170         if (error == 0) {
  171                 mtx_lock(&Giant);
  172                 boot(uap->opt);
  173                 mtx_unlock(&Giant);
  174         }
  175         return (error);
  176 }
  177 
  178 /*
  179  * Called by events that want to shut down.. e.g  <CTL><ALT><DEL> on a PC
  180  */
  181 static int shutdown_howto = 0;
  182 
  183 void
  184 shutdown_nice(int howto)
  185 {
  186 
  187         shutdown_howto = howto;
  188 
  189         /* Send a signal to init(8) and have it shutdown the world */
  190         if (initproc != NULL) {
  191                 PROC_LOCK(initproc);
  192                 psignal(initproc, SIGINT);
  193                 PROC_UNLOCK(initproc);
  194         } else {
  195                 /* No init(8) running, so simply reboot */
  196                 boot(RB_NOSYNC);
  197         }
  198         return;
  199 }
  200 static int      waittime = -1;
  201 
  202 static void
  203 print_uptime(void)
  204 {
  205         int f;
  206         struct timespec ts;
  207 
  208         getnanouptime(&ts);
  209         printf("Uptime: ");
  210         f = 0;
  211         if (ts.tv_sec >= 86400) {
  212                 printf("%ldd", (long)ts.tv_sec / 86400);
  213                 ts.tv_sec %= 86400;
  214                 f = 1;
  215         }
  216         if (f || ts.tv_sec >= 3600) {
  217                 printf("%ldh", (long)ts.tv_sec / 3600);
  218                 ts.tv_sec %= 3600;
  219                 f = 1;
  220         }
  221         if (f || ts.tv_sec >= 60) {
  222                 printf("%ldm", (long)ts.tv_sec / 60);
  223                 ts.tv_sec %= 60;
  224                 f = 1;
  225         }
  226         printf("%lds\n", (long)ts.tv_sec);
  227 }
  228 
  229 static void
  230 doadump(void)
  231 {
  232 
  233         /*
  234          * Sometimes people have to call this from the kernel debugger. 
  235          * (if 'panic' can not dump)
  236          * Give them a clue as to why they can't dump.
  237          */
  238         if (dumper.dumper == NULL) {
  239                 printf("Cannot dump. No dump device defined.\n");
  240                 return;
  241         }
  242 
  243         savectx(&dumppcb);
  244         dumptid = curthread->td_tid;
  245         dumping++;
  246 #ifdef DDB
  247         if (textdump_pending)
  248                 textdump_dumpsys(&dumper);
  249         else
  250 #endif
  251                 dumpsys(&dumper);
  252         dumping--;
  253 }
  254 
  255 static int
  256 isbufbusy(struct buf *bp)
  257 {
  258         if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
  259             BUF_REFCNT(bp) > 0) ||
  260             ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
  261                 return (1);
  262         return (0);
  263 }
  264 
  265 /*
  266  * Shutdown the system cleanly to prepare for reboot, halt, or power off.
  267  */
  268 static void
  269 boot(int howto)
  270 {
  271         static int first_buf_printf = 1;
  272 
  273 #if defined(SMP)
  274         /*
  275          * Bind us to CPU 0 so that all shutdown code runs there.  Some
  276          * systems don't shutdown properly (i.e., ACPI power off) if we
  277          * run on another processor.
  278          */
  279         thread_lock(curthread);
  280         sched_bind(curthread, 0);
  281         thread_unlock(curthread);
  282         KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
  283 #endif
  284         /* We're in the process of rebooting. */
  285         rebooting = 1;
  286 
  287         /* collect extra flags that shutdown_nice might have set */
  288         howto |= shutdown_howto;
  289 
  290         /* We are out of the debugger now. */
  291         kdb_active = 0;
  292 
  293         /*
  294          * Do any callouts that should be done BEFORE syncing the filesystems.
  295          */
  296         EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
  297 
  298         /* 
  299          * Now sync filesystems
  300          */
  301         if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
  302                 register struct buf *bp;
  303                 int iter, nbusy, pbusy;
  304 #ifndef PREEMPTION
  305                 int subiter;
  306 #endif
  307 
  308                 waittime = 0;
  309 
  310                 sync(curthread, NULL);
  311 
  312                 /*
  313                  * With soft updates, some buffers that are
  314                  * written will be remarked as dirty until other
  315                  * buffers are written.
  316                  */
  317                 for (iter = pbusy = 0; iter < 20; iter++) {
  318                         nbusy = 0;
  319                         for (bp = &buf[nbuf]; --bp >= buf; )
  320                                 if (isbufbusy(bp))
  321                                         nbusy++;
  322                         if (nbusy == 0) {
  323                                 if (first_buf_printf)
  324                                         printf("All buffers synced.");
  325                                 break;
  326                         }
  327                         if (first_buf_printf) {
  328                                 printf("Syncing disks, buffers remaining... ");
  329                                 first_buf_printf = 0;
  330                         }
  331                         printf("%d ", nbusy);
  332                         if (nbusy < pbusy)
  333                                 iter = 0;
  334                         pbusy = nbusy;
  335                         sync(curthread, NULL);
  336 
  337 #ifdef PREEMPTION
  338                         /*
  339                          * Drop Giant and spin for a while to allow
  340                          * interrupt threads to run.
  341                          */
  342                         DROP_GIANT();
  343                         DELAY(50000 * iter);
  344                         PICKUP_GIANT();
  345 #else
  346                         /*
  347                          * Drop Giant and context switch several times to
  348                          * allow interrupt threads to run.
  349                          */
  350                         DROP_GIANT();
  351                         for (subiter = 0; subiter < 50 * iter; subiter++) {
  352                                 thread_lock(curthread);
  353                                 mi_switch(SW_VOL, NULL);
  354                                 thread_unlock(curthread);
  355                                 DELAY(1000);
  356                         }
  357                         PICKUP_GIANT();
  358 #endif
  359                 }
  360                 printf("\n");
  361                 /*
  362                  * Count only busy local buffers to prevent forcing 
  363                  * a fsck if we're just a client of a wedged NFS server
  364                  */
  365                 nbusy = 0;
  366                 for (bp = &buf[nbuf]; --bp >= buf; ) {
  367                         if (isbufbusy(bp)) {
  368 #if 0
  369 /* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
  370                                 if (bp->b_dev == NULL) {
  371                                         TAILQ_REMOVE(&mountlist,
  372                                             bp->b_vp->v_mount, mnt_list);
  373                                         continue;
  374                                 }
  375 #endif
  376                                 nbusy++;
  377 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
  378                                 printf(
  379                             "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n",
  380                                     nbusy, bp->b_bufobj,
  381                                     bp->b_flags, (long)bp->b_blkno,
  382                                     (long)bp->b_lblkno);
  383 #endif
  384                         }
  385                 }
  386                 if (nbusy) {
  387                         /*
  388                          * Failed to sync all blocks. Indicate this and don't
  389                          * unmount filesystems (thus forcing an fsck on reboot).
  390                          */
  391                         printf("Giving up on %d buffers\n", nbusy);
  392                         DELAY(5000000); /* 5 seconds */
  393                 } else {
  394                         if (!first_buf_printf)
  395                                 printf("Final sync complete\n");
  396                         /*
  397                          * Unmount filesystems
  398                          */
  399                         if (panicstr == 0)
  400                                 vfs_unmountall();
  401                 }
  402                 swapoff_all();
  403                 DELAY(100000);          /* wait for console output to finish */
  404         }
  405 
  406         print_uptime();
  407 
  408         /*
  409          * Ok, now do things that assume all filesystem activity has
  410          * been completed.
  411          */
  412         EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
  413 
  414         /* XXX This doesn't disable interrupts any more.  Reconsider? */
  415         splhigh();
  416 
  417         if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
  418                 doadump();
  419 
  420         /* Now that we're going to really halt the system... */
  421         EVENTHANDLER_INVOKE(shutdown_final, howto);
  422 
  423         for(;;) ;       /* safety against shutdown_reset not working */
  424         /* NOTREACHED */
  425 }
  426 
  427 /*
  428  * If the shutdown was a clean halt, behave accordingly.
  429  */
  430 static void
  431 shutdown_halt(void *junk, int howto)
  432 {
  433 
  434         if (howto & RB_HALT) {
  435                 printf("\n");
  436                 printf("The operating system has halted.\n");
  437                 printf("Please press any key to reboot.\n\n");
  438                 switch (cngetc()) {
  439                 case -1:                /* No console, just die */
  440                         cpu_halt();
  441                         /* NOTREACHED */
  442                 default:
  443                         howto &= ~RB_HALT;
  444                         break;
  445                 }
  446         }
  447 }
  448 
  449 /*
  450  * Check to see if the system paniced, pause and then reboot
  451  * according to the specified delay.
  452  */
  453 static void
  454 shutdown_panic(void *junk, int howto)
  455 {
  456         int loop;
  457 
  458         if (howto & RB_DUMP) {
  459                 if (PANIC_REBOOT_WAIT_TIME != 0) {
  460                         if (PANIC_REBOOT_WAIT_TIME != -1) {
  461                                 printf("Automatic reboot in %d seconds - "
  462                                        "press a key on the console to abort\n",
  463                                         PANIC_REBOOT_WAIT_TIME);
  464                                 for (loop = PANIC_REBOOT_WAIT_TIME * 10;
  465                                      loop > 0; --loop) {
  466                                         DELAY(1000 * 100); /* 1/10th second */
  467                                         /* Did user type a key? */
  468                                         if (cncheckc() != -1)
  469                                                 break;
  470                                 }
  471                                 if (!loop)
  472                                         return;
  473                         }
  474                 } else { /* zero time specified - reboot NOW */
  475                         return;
  476                 }
  477                 printf("--> Press a key on the console to reboot,\n");
  478                 printf("--> or switch off the system now.\n");
  479                 cngetc();
  480         }
  481 }
  482 
  483 /*
  484  * Everything done, now reset
  485  */
  486 static void
  487 shutdown_reset(void *junk, int howto)
  488 {
  489 
  490         printf("Rebooting...\n");
  491         DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
  492         /* cpu_boot(howto); */ /* doesn't do anything at the moment */
  493         cpu_reset();
  494         /* NOTREACHED */ /* assuming reset worked */
  495 }
  496 
  497 #ifdef SMP
  498 static u_int panic_cpu = NOCPU;
  499 #endif
  500 
  501 /*
  502  * Panic is called on unresolvable fatal errors.  It prints "panic: mesg",
  503  * and then reboots.  If we are called twice, then we avoid trying to sync
  504  * the disks as this often leads to recursive panics.
  505  */
  506 void
  507 panic(const char *fmt, ...)
  508 {
  509         struct thread *td = curthread;
  510         int bootopt, newpanic;
  511         va_list ap;
  512         static char buf[256];
  513 
  514         critical_enter();
  515 #ifdef SMP
  516         /*
  517          * We don't want multiple CPU's to panic at the same time, so we
  518          * use panic_cpu as a simple spinlock.  We have to keep checking
  519          * panic_cpu if we are spinning in case the panic on the first
  520          * CPU is canceled.
  521          */
  522         if (panic_cpu != PCPU_GET(cpuid))
  523                 while (atomic_cmpset_int(&panic_cpu, NOCPU,
  524                     PCPU_GET(cpuid)) == 0)
  525                         while (panic_cpu != NOCPU)
  526                                 ; /* nothing */
  527 #endif
  528 
  529         bootopt = RB_AUTOBOOT | RB_DUMP;
  530         newpanic = 0;
  531         if (panicstr)
  532                 bootopt |= RB_NOSYNC;
  533         else {
  534                 panicstr = fmt;
  535                 newpanic = 1;
  536         }
  537 
  538         va_start(ap, fmt);
  539         if (newpanic) {
  540                 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
  541                 panicstr = buf;
  542                 printf("panic: %s\n", buf);
  543         } else {
  544                 printf("panic: ");
  545                 vprintf(fmt, ap);
  546                 printf("\n");
  547         }
  548         va_end(ap);
  549 #ifdef SMP
  550         printf("cpuid = %d\n", PCPU_GET(cpuid));
  551 #endif
  552 
  553 #ifdef KDB
  554         if (newpanic && trace_on_panic)
  555                 kdb_backtrace();
  556         if (debugger_on_panic)
  557                 kdb_enter_why(KDB_WHY_PANIC, "panic");
  558 #ifdef RESTARTABLE_PANICS
  559         /* See if the user aborted the panic, in which case we continue. */
  560         if (panicstr == NULL) {
  561 #ifdef SMP
  562                 atomic_store_rel_int(&panic_cpu, NOCPU);
  563 #endif
  564                 return;
  565         }
  566 #endif
  567 #endif
  568         /*thread_lock(td); */
  569         td->td_flags |= TDF_INPANIC;
  570         /* thread_unlock(td); */
  571         if (!sync_on_panic)
  572                 bootopt |= RB_NOSYNC;
  573         critical_exit();
  574         boot(bootopt);
  575 }
  576 
  577 /*
  578  * Support for poweroff delay.
  579  */
  580 #ifndef POWEROFF_DELAY
  581 # define POWEROFF_DELAY 5000
  582 #endif
  583 static int poweroff_delay = POWEROFF_DELAY;
  584 
  585 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
  586         &poweroff_delay, 0, "");
  587 
  588 static void
  589 poweroff_wait(void *junk, int howto)
  590 {
  591 
  592         if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
  593                 return;
  594         DELAY(poweroff_delay * 1000);
  595 }
  596 
  597 /*
  598  * Some system processes (e.g. syncer) need to be stopped at appropriate
  599  * points in their main loops prior to a system shutdown, so that they
  600  * won't interfere with the shutdown process (e.g. by holding a disk buf
  601  * to cause sync to fail).  For each of these system processes, register
  602  * shutdown_kproc() as a handler for one of shutdown events.
  603  */
  604 static int kproc_shutdown_wait = 60;
  605 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
  606     &kproc_shutdown_wait, 0, "");
  607 
  608 void
  609 kproc_shutdown(void *arg, int howto)
  610 {
  611         struct proc *p;
  612         char procname[MAXCOMLEN + 1];
  613         int error;
  614 
  615         if (panicstr)
  616                 return;
  617 
  618         p = (struct proc *)arg;
  619         strlcpy(procname, p->p_comm, sizeof(procname));
  620         printf("Waiting (max %d seconds) for system process `%s' to stop...",
  621             kproc_shutdown_wait, procname);
  622         error = kthread_suspend(p, kproc_shutdown_wait * hz);
  623 
  624         if (error == EWOULDBLOCK)
  625                 printf("timed out\n");
  626         else
  627                 printf("done\n");
  628 }
  629 
  630 /* Registration of dumpers */
  631 int
  632 set_dumper(struct dumperinfo *di)
  633 {
  634 
  635         if (di == NULL) {
  636                 bzero(&dumper, sizeof dumper);
  637                 return (0);
  638         }
  639         if (dumper.dumper != NULL)
  640                 return (EBUSY);
  641         dumper = *di;
  642         return (0);
  643 }
  644 
  645 /* Call dumper with bounds checking. */
  646 int
  647 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
  648     off_t offset, size_t length)
  649 {
  650 
  651         if (length != 0 && (offset < di->mediaoffset ||
  652             offset - di->mediaoffset + length > di->mediasize)) {
  653                 printf("Attempt to write outside dump device boundaries.\n");
  654                 return (ENXIO);
  655         }
  656         return (di->dumper(di->priv, virtual, physical, offset, length));
  657 }
  658 
  659 #if defined(__powerpc__)
  660 void
  661 dumpsys(struct dumperinfo *di __unused)
  662 {
  663 
  664         printf("Kernel dumps not implemented on this architecture\n");
  665 }
  666 #endif
Cache object: 2043ab5243c20f7860e0cc59bb009a2b
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FreeBSD/Linux Kernel Cross Reference sys/kern/kern_shutdown.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_shutdown.c
