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.
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11 * modification, are permitted provided that the following conditions
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
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19 * may be used to endorse or promote products derived from this software
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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
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34 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
42 #include "opt_panic.h"
43 #include "opt_sched.h"
44 #include "opt_watchdog.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
52 #include <sys/eventhandler.h>
55 #include <sys/kernel.h>
56 #include <sys/kerneldump.h>
57 #include <sys/kthread.h>
59 #include <sys/malloc.h>
60 #include <sys/mount.h>
63 #include <sys/reboot.h>
64 #include <sys/resourcevar.h>
65 #include <sys/rwlock.h>
66 #include <sys/sched.h>
68 #include <sys/sysctl.h>
69 #include <sys/sysproto.h>
70 #include <sys/vnode.h>
71 #include <sys/watchdog.h>
75 #include <machine/cpu.h>
76 #include <machine/pcb.h>
77 #include <machine/smp.h>
79 #include <security/mac/mac_framework.h>
82 #include <vm/vm_object.h>
83 #include <vm/vm_page.h>
84 #include <vm/vm_pager.h>
85 #include <vm/swap_pager.h>
87 #include <sys/signalvar.h>
89 #ifndef PANIC_REBOOT_WAIT_TIME
90 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
92 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME;
93 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RW | CTLFLAG_TUN,
94 &panic_reboot_wait_time, 0,
95 "Seconds to wait before rebooting after a panic");
96 TUNABLE_INT("kern.panic_reboot_wait_time", &panic_reboot_wait_time);
99 * Note that stdarg.h and the ANSI style va_start macro is used for both
100 * ANSI and traditional C compilers.
102 #include <machine/stdarg.h>
105 #ifdef KDB_UNATTENDED
106 int debugger_on_panic = 0;
108 int debugger_on_panic = 1;
110 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic,
111 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN,
112 &debugger_on_panic, 0, "Run debugger on kernel panic");
113 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic);
116 static int trace_on_panic = 1;
118 static int trace_on_panic = 0;
120 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
121 CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_TUN,
122 &trace_on_panic, 0, "Print stack trace on kernel panic");
123 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic);
126 static int sync_on_panic = 0;
127 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN,
128 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
129 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic);
131 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0,
132 "Shutdown environment");
135 static int show_busybufs;
137 static int show_busybufs = 1;
139 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
140 &show_busybufs, 0, "");
142 int suspend_blocked = 0;
143 SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW,
144 &suspend_blocked, 0, "Block suspend due to a pending shutdown");
147 * Variable panicstr contains argument to first call to panic; used as flag
148 * to indicate that the kernel has already called panic.
150 const char *panicstr;
152 int dumping; /* system is dumping */
153 int rebooting; /* system is rebooting */
154 static struct dumperinfo dumper; /* our selected dumper */
156 /* Context information for dump-debuggers. */
157 static struct pcb dumppcb; /* Registers. */
158 lwpid_t dumptid; /* Thread ID. */
160 static void poweroff_wait(void *, int);
161 static void shutdown_halt(void *junk, int howto);
162 static void shutdown_panic(void *junk, int howto);
163 static void shutdown_reset(void *junk, int howto);
165 /* register various local shutdown events */
167 shutdown_conf(void *unused)
170 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
172 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
173 SHUTDOWN_PRI_LAST + 100);
174 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
175 SHUTDOWN_PRI_LAST + 100);
176 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
177 SHUTDOWN_PRI_LAST + 200);
180 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
183 * The system call that results in a reboot.
187 sys_reboot(struct thread *td, struct reboot_args *uap)
193 error = mac_system_check_reboot(td->td_ucred, uap->opt);
196 error = priv_check(td, PRIV_REBOOT);
199 kern_reboot(uap->opt);
206 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
208 static int shutdown_howto = 0;
211 shutdown_nice(int howto)
214 shutdown_howto = howto;
216 /* Send a signal to init(8) and have it shutdown the world */
217 if (initproc != NULL) {
219 kern_psignal(initproc, SIGINT);
220 PROC_UNLOCK(initproc);
222 /* No init(8) running, so simply reboot */
223 kern_reboot(RB_NOSYNC);
227 static int waittime = -1;
238 if (ts.tv_sec >= 86400) {
239 printf("%ldd", (long)ts.tv_sec / 86400);
243 if (f || ts.tv_sec >= 3600) {
244 printf("%ldh", (long)ts.tv_sec / 3600);
248 if (f || ts.tv_sec >= 60) {
249 printf("%ldm", (long)ts.tv_sec / 60);
253 printf("%lds\n", (long)ts.tv_sec);
257 doadump(boolean_t textdump)
263 if (dumper.dumper == NULL)
267 dumptid = curthread->td_tid;
272 if (textdump && textdump_pending) {
274 textdump_dumpsys(&dumper);
285 isbufbusy(struct buf *bp)
287 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
289 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
295 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
298 kern_reboot(int howto)
300 static int first_buf_printf = 1;
304 * Bind us to CPU 0 so that all shutdown code runs there. Some
305 * systems don't shutdown properly (i.e., ACPI power off) if we
306 * run on another processor.
308 if (!SCHEDULER_STOPPED()) {
309 thread_lock(curthread);
310 sched_bind(curthread, 0);
311 thread_unlock(curthread);
312 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
315 /* We're in the process of rebooting. */
318 /* collect extra flags that shutdown_nice might have set */
319 howto |= shutdown_howto;
321 /* We are out of the debugger now. */
325 * Do any callouts that should be done BEFORE syncing the filesystems.
327 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
330 * Now sync filesystems
332 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
333 register struct buf *bp;
334 int iter, nbusy, pbusy;
341 wdog_kern_pat(WD_LASTVAL);
342 sys_sync(curthread, NULL);
345 * With soft updates, some buffers that are
346 * written will be remarked as dirty until other
347 * buffers are written.
349 for (iter = pbusy = 0; iter < 20; iter++) {
351 for (bp = &buf[nbuf]; --bp >= buf; )
355 if (first_buf_printf)
356 printf("All buffers synced.");
359 if (first_buf_printf) {
360 printf("Syncing disks, buffers remaining... ");
361 first_buf_printf = 0;
363 printf("%d ", nbusy);
368 wdog_kern_pat(WD_LASTVAL);
369 sys_sync(curthread, NULL);
373 * Drop Giant and spin for a while to allow
374 * interrupt threads to run.
381 * Drop Giant and context switch several times to
382 * allow interrupt threads to run.
385 for (subiter = 0; subiter < 50 * iter; subiter++) {
386 thread_lock(curthread);
387 mi_switch(SW_VOL, NULL);
388 thread_unlock(curthread);
396 * Count only busy local buffers to prevent forcing
397 * a fsck if we're just a client of a wedged NFS server
400 for (bp = &buf[nbuf]; --bp >= buf; ) {
403 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
404 if (bp->b_dev == NULL) {
405 TAILQ_REMOVE(&mountlist,
406 bp->b_vp->v_mount, mnt_list);
411 if (show_busybufs > 0) {
413 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
414 nbusy, bp, bp->b_vp, bp->b_flags,
415 (intmax_t)bp->b_blkno,
416 (intmax_t)bp->b_lblkno);
417 BUF_LOCKPRINTINFO(bp);
418 if (show_busybufs > 1)
426 * Failed to sync all blocks. Indicate this and don't
427 * unmount filesystems (thus forcing an fsck on reboot).
429 printf("Giving up on %d buffers\n", nbusy);
430 DELAY(5000000); /* 5 seconds */
432 if (!first_buf_printf)
433 printf("Final sync complete\n");
435 * Unmount filesystems
441 DELAY(100000); /* wait for console output to finish */
449 * Ok, now do things that assume all filesystem activity has
452 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
454 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
457 /* Now that we're going to really halt the system... */
458 EVENTHANDLER_INVOKE(shutdown_final, howto);
460 for(;;) ; /* safety against shutdown_reset not working */
465 * If the shutdown was a clean halt, behave accordingly.
468 shutdown_halt(void *junk, int howto)
471 if (howto & RB_HALT) {
473 printf("The operating system has halted.\n");
474 printf("Please press any key to reboot.\n\n");
476 case -1: /* No console, just die */
487 * Check to see if the system paniced, pause and then reboot
488 * according to the specified delay.
491 shutdown_panic(void *junk, int howto)
495 if (howto & RB_DUMP) {
496 if (panic_reboot_wait_time != 0) {
497 if (panic_reboot_wait_time != -1) {
498 printf("Automatic reboot in %d seconds - "
499 "press a key on the console to abort\n",
500 panic_reboot_wait_time);
501 for (loop = panic_reboot_wait_time * 10;
503 DELAY(1000 * 100); /* 1/10th second */
504 /* Did user type a key? */
505 if (cncheckc() != -1)
511 } else { /* zero time specified - reboot NOW */
514 printf("--> Press a key on the console to reboot,\n");
515 printf("--> or switch off the system now.\n");
521 * Everything done, now reset
524 shutdown_reset(void *junk, int howto)
527 printf("Rebooting...\n");
528 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
531 * Acquiring smp_ipi_mtx here has a double effect:
532 * - it disables interrupts avoiding CPU0 preemption
533 * by fast handlers (thus deadlocking against other CPUs)
534 * - it avoids deadlocks against smp_rendezvous() or, more
535 * generally, threads busy-waiting, with this spinlock held,
536 * and waiting for responses by threads on other CPUs
537 * (ie. smp_tlb_shootdown()).
539 * For the !SMP case it just needs to handle the former problem.
542 mtx_lock_spin(&smp_ipi_mtx);
547 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
549 /* NOTREACHED */ /* assuming reset worked */
552 #if defined(WITNESS) || defined(INVARIANTS)
553 static int kassert_warn_only = 0;
555 static int kassert_do_kdb = 0;
558 static int kassert_do_ktr = 0;
560 static int kassert_do_log = 1;
561 static int kassert_log_pps_limit = 4;
562 static int kassert_log_mute_at = 0;
563 static int kassert_log_panic_at = 0;
564 static int kassert_warnings = 0;
566 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options");
568 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RW | CTLFLAG_TUN,
569 &kassert_warn_only, 0,
570 "KASSERT triggers a panic (1) or just a warning (0)");
571 TUNABLE_INT("debug.kassert.warn_only", &kassert_warn_only);
574 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RW | CTLFLAG_TUN,
575 &kassert_do_kdb, 0, "KASSERT will enter the debugger");
576 TUNABLE_INT("debug.kassert.do_kdb", &kassert_do_kdb);
580 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RW | CTLFLAG_TUN,
582 "KASSERT does a KTR, set this to the KTRMASK you want");
583 TUNABLE_INT("debug.kassert.do_ktr", &kassert_do_ktr);
586 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RW | CTLFLAG_TUN,
587 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)");
588 TUNABLE_INT("debug.kassert.do_log", &kassert_do_log);
590 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RW | CTLFLAG_TUN,
591 &kassert_warnings, 0, "number of KASSERTs that have been triggered");
592 TUNABLE_INT("debug.kassert.warnings", &kassert_warnings);
594 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RW | CTLFLAG_TUN,
595 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
596 TUNABLE_INT("debug.kassert.log_panic_at", &kassert_log_panic_at);
598 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RW | CTLFLAG_TUN,
599 &kassert_log_pps_limit, 0, "limit number of log messages per second");
600 TUNABLE_INT("debug.kassert.log_pps_limit", &kassert_log_pps_limit);
602 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RW | CTLFLAG_TUN,
603 &kassert_log_mute_at, 0, "max number of KASSERTS to log");
604 TUNABLE_INT("debug.kassert.log_mute_at", &kassert_log_mute_at);
606 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
608 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
609 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0,
610 kassert_sysctl_kassert, "I", "set to trigger a test kassert");
613 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
617 error = sysctl_wire_old_buffer(req, sizeof(int));
620 error = sysctl_handle_int(oidp, &i, 0, req);
622 if (error != 0 || req->newptr == NULL)
624 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
629 * Called by KASSERT, this decides if we will panic
630 * or if we will log via printf and/or ktr.
633 kassert_panic(const char *fmt, ...)
635 static char buf[256];
639 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
643 * panic if we're not just warning, or if we've exceeded
644 * kassert_log_panic_at warnings.
646 if (!kassert_warn_only ||
647 (kassert_log_panic_at > 0 &&
648 kassert_warnings >= kassert_log_panic_at)) {
658 * log if we've not yet met the mute limit.
660 if (kassert_do_log &&
661 (kassert_log_mute_at == 0 ||
662 kassert_warnings < kassert_log_mute_at)) {
663 static struct timeval lasterr;
666 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
667 printf("KASSERT failed: %s\n", buf);
672 if (kassert_do_kdb) {
673 kdb_enter(KDB_WHY_KASSERT, buf);
676 atomic_add_int(&kassert_warnings, 1);
681 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
682 * and then reboots. If we are called twice, then we avoid trying to sync
683 * the disks as this often leads to recursive panics.
686 panic(const char *fmt, ...)
695 vpanic(const char *fmt, va_list ap)
700 struct thread *td = curthread;
701 int bootopt, newpanic;
702 static char buf[256];
708 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from
709 * concurrently entering panic. Only the winner will proceed
712 if (panicstr == NULL && !kdb_active) {
713 other_cpus = all_cpus;
714 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
715 stop_cpus_hard(other_cpus);
719 * We set stop_scheduler here and not in the block above,
720 * because we want to ensure that if panic has been called and
721 * stop_scheduler_on_panic is true, then stop_scheduler will
722 * always be set. Even if panic has been entered from kdb.
724 td->td_stopsched = 1;
727 bootopt = RB_AUTOBOOT;
730 bootopt |= RB_NOSYNC;
738 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
741 printf("panic: %s\n", buf);
748 printf("cpuid = %d\n", PCPU_GET(cpuid));
752 if (newpanic && trace_on_panic)
754 if (debugger_on_panic)
755 kdb_enter(KDB_WHY_PANIC, "panic");
757 /*thread_lock(td); */
758 td->td_flags |= TDF_INPANIC;
759 /* thread_unlock(td); */
761 bootopt |= RB_NOSYNC;
762 kern_reboot(bootopt);
766 * Support for poweroff delay.
768 * Please note that setting this delay too short might power off your machine
769 * before the write cache on your hard disk has been flushed, leading to
770 * soft-updates inconsistencies.
772 #ifndef POWEROFF_DELAY
773 # define POWEROFF_DELAY 5000
775 static int poweroff_delay = POWEROFF_DELAY;
777 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
778 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
781 poweroff_wait(void *junk, int howto)
784 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
786 DELAY(poweroff_delay * 1000);
790 * Some system processes (e.g. syncer) need to be stopped at appropriate
791 * points in their main loops prior to a system shutdown, so that they
792 * won't interfere with the shutdown process (e.g. by holding a disk buf
793 * to cause sync to fail). For each of these system processes, register
794 * shutdown_kproc() as a handler for one of shutdown events.
796 static int kproc_shutdown_wait = 60;
797 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
798 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
801 kproc_shutdown(void *arg, int howto)
809 p = (struct proc *)arg;
810 printf("Waiting (max %d seconds) for system process `%s' to stop...",
811 kproc_shutdown_wait, p->p_comm);
812 error = kproc_suspend(p, kproc_shutdown_wait * hz);
814 if (error == EWOULDBLOCK)
815 printf("timed out\n");
821 kthread_shutdown(void *arg, int howto)
829 td = (struct thread *)arg;
830 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
831 kproc_shutdown_wait, td->td_name);
832 error = kthread_suspend(td, kproc_shutdown_wait * hz);
834 if (error == EWOULDBLOCK)
835 printf("timed out\n");
840 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)];
841 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD,
842 dumpdevname, 0, "Device for kernel dumps");
844 /* Registration of dumpers */
846 set_dumper(struct dumperinfo *di, const char *devname, struct thread *td)
851 error = priv_check(td, PRIV_SETDUMPER);
856 bzero(&dumper, sizeof dumper);
857 dumpdevname[0] = '\0';
860 if (dumper.dumper != NULL)
863 wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname));
864 if (wantcopy >= sizeof(dumpdevname)) {
865 printf("set_dumper: device name truncated from '%s' -> '%s'\n",
866 devname, dumpdevname);
871 /* Call dumper with bounds checking. */
873 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
874 off_t offset, size_t length)
877 if (length != 0 && (offset < di->mediaoffset ||
878 offset - di->mediaoffset + length > di->mediasize)) {
879 printf("Attempt to write outside dump device boundaries.\n"
880 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
881 (intmax_t)offset, (intmax_t)di->mediaoffset,
882 (uintmax_t)length, (intmax_t)di->mediasize);
885 return (di->dumper(di->priv, virtual, physical, offset, length));
889 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
890 uint64_t dumplen, uint32_t blksz)
893 bzero(kdh, sizeof(*kdh));
894 strlcpy(kdh->magic, magic, sizeof(kdh->magic));
895 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
896 kdh->version = htod32(KERNELDUMPVERSION);
897 kdh->architectureversion = htod32(archver);
898 kdh->dumplength = htod64(dumplen);
899 kdh->dumptime = htod64(time_second);
900 kdh->blocksize = htod32(blksz);
901 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
902 strlcpy(kdh->versionstring, version, sizeof(kdh->versionstring));
903 if (panicstr != NULL)
904 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
905 kdh->parity = kerneldump_parity(kdh);