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
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7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
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14 * notice, this list of conditions and the following disclaimer.
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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, "");
143 * Variable panicstr contains argument to first call to panic; used as flag
144 * to indicate that the kernel has already called panic.
146 const char *panicstr;
148 int dumping; /* system is dumping */
149 int rebooting; /* system is rebooting */
150 static struct dumperinfo dumper; /* our selected dumper */
152 /* Context information for dump-debuggers. */
153 static struct pcb dumppcb; /* Registers. */
154 lwpid_t dumptid; /* Thread ID. */
156 static void poweroff_wait(void *, int);
157 static void shutdown_halt(void *junk, int howto);
158 static void shutdown_panic(void *junk, int howto);
159 static void shutdown_reset(void *junk, int howto);
161 /* register various local shutdown events */
163 shutdown_conf(void *unused)
166 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
168 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
169 SHUTDOWN_PRI_LAST + 100);
170 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
171 SHUTDOWN_PRI_LAST + 100);
172 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
173 SHUTDOWN_PRI_LAST + 200);
176 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
179 * The system call that results in a reboot.
183 sys_reboot(struct thread *td, struct reboot_args *uap)
189 error = mac_system_check_reboot(td->td_ucred, uap->opt);
192 error = priv_check(td, PRIV_REBOOT);
195 kern_reboot(uap->opt);
202 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
204 static int shutdown_howto = 0;
207 shutdown_nice(int howto)
210 shutdown_howto = howto;
212 /* Send a signal to init(8) and have it shutdown the world */
213 if (initproc != NULL) {
215 kern_psignal(initproc, SIGINT);
216 PROC_UNLOCK(initproc);
218 /* No init(8) running, so simply reboot */
219 kern_reboot(RB_NOSYNC);
223 static int waittime = -1;
234 if (ts.tv_sec >= 86400) {
235 printf("%ldd", (long)ts.tv_sec / 86400);
239 if (f || ts.tv_sec >= 3600) {
240 printf("%ldh", (long)ts.tv_sec / 3600);
244 if (f || ts.tv_sec >= 60) {
245 printf("%ldm", (long)ts.tv_sec / 60);
249 printf("%lds\n", (long)ts.tv_sec);
253 doadump(boolean_t textdump)
259 if (dumper.dumper == NULL)
263 dumptid = curthread->td_tid;
268 if (textdump && textdump_pending) {
270 textdump_dumpsys(&dumper);
281 isbufbusy(struct buf *bp)
283 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 &&
285 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI))
291 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
294 kern_reboot(int howto)
296 static int first_buf_printf = 1;
300 * Bind us to CPU 0 so that all shutdown code runs there. Some
301 * systems don't shutdown properly (i.e., ACPI power off) if we
302 * run on another processor.
304 if (!SCHEDULER_STOPPED()) {
305 thread_lock(curthread);
306 sched_bind(curthread, 0);
307 thread_unlock(curthread);
308 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
311 /* We're in the process of rebooting. */
314 /* collect extra flags that shutdown_nice might have set */
315 howto |= shutdown_howto;
317 /* We are out of the debugger now. */
321 * Do any callouts that should be done BEFORE syncing the filesystems.
323 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
326 * Now sync filesystems
328 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
329 register struct buf *bp;
330 int iter, nbusy, pbusy;
337 wdog_kern_pat(WD_LASTVAL);
338 sys_sync(curthread, NULL);
341 * With soft updates, some buffers that are
342 * written will be remarked as dirty until other
343 * buffers are written.
345 for (iter = pbusy = 0; iter < 20; iter++) {
347 for (bp = &buf[nbuf]; --bp >= buf; )
351 if (first_buf_printf)
352 printf("All buffers synced.");
355 if (first_buf_printf) {
356 printf("Syncing disks, buffers remaining... ");
357 first_buf_printf = 0;
359 printf("%d ", nbusy);
364 wdog_kern_pat(WD_LASTVAL);
365 sys_sync(curthread, NULL);
369 * Drop Giant and spin for a while to allow
370 * interrupt threads to run.
377 * Drop Giant and context switch several times to
378 * allow interrupt threads to run.
381 for (subiter = 0; subiter < 50 * iter; subiter++) {
382 thread_lock(curthread);
383 mi_switch(SW_VOL, NULL);
384 thread_unlock(curthread);
392 * Count only busy local buffers to prevent forcing
393 * a fsck if we're just a client of a wedged NFS server
396 for (bp = &buf[nbuf]; --bp >= buf; ) {
399 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */
400 if (bp->b_dev == NULL) {
401 TAILQ_REMOVE(&mountlist,
402 bp->b_vp->v_mount, mnt_list);
407 if (show_busybufs > 0) {
409 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
410 nbusy, bp, bp->b_vp, bp->b_flags,
411 (intmax_t)bp->b_blkno,
412 (intmax_t)bp->b_lblkno);
413 BUF_LOCKPRINTINFO(bp);
414 if (show_busybufs > 1)
422 * Failed to sync all blocks. Indicate this and don't
423 * unmount filesystems (thus forcing an fsck on reboot).
425 printf("Giving up on %d buffers\n", nbusy);
426 DELAY(5000000); /* 5 seconds */
428 if (!first_buf_printf)
429 printf("Final sync complete\n");
431 * Unmount filesystems
437 DELAY(100000); /* wait for console output to finish */
445 * Ok, now do things that assume all filesystem activity has
448 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
450 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
453 /* Now that we're going to really halt the system... */
454 EVENTHANDLER_INVOKE(shutdown_final, howto);
456 for(;;) ; /* safety against shutdown_reset not working */
461 * If the shutdown was a clean halt, behave accordingly.
464 shutdown_halt(void *junk, int howto)
467 if (howto & RB_HALT) {
469 printf("The operating system has halted.\n");
470 printf("Please press any key to reboot.\n\n");
472 case -1: /* No console, just die */
483 * Check to see if the system paniced, pause and then reboot
484 * according to the specified delay.
487 shutdown_panic(void *junk, int howto)
491 if (howto & RB_DUMP) {
492 if (panic_reboot_wait_time != 0) {
493 if (panic_reboot_wait_time != -1) {
494 printf("Automatic reboot in %d seconds - "
495 "press a key on the console to abort\n",
496 panic_reboot_wait_time);
497 for (loop = panic_reboot_wait_time * 10;
499 DELAY(1000 * 100); /* 1/10th second */
500 /* Did user type a key? */
501 if (cncheckc() != -1)
507 } else { /* zero time specified - reboot NOW */
510 printf("--> Press a key on the console to reboot,\n");
511 printf("--> or switch off the system now.\n");
517 * Everything done, now reset
520 shutdown_reset(void *junk, int howto)
523 printf("Rebooting...\n");
524 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
527 * Acquiring smp_ipi_mtx here has a double effect:
528 * - it disables interrupts avoiding CPU0 preemption
529 * by fast handlers (thus deadlocking against other CPUs)
530 * - it avoids deadlocks against smp_rendezvous() or, more
531 * generally, threads busy-waiting, with this spinlock held,
532 * and waiting for responses by threads on other CPUs
533 * (ie. smp_tlb_shootdown()).
535 * For the !SMP case it just needs to handle the former problem.
538 mtx_lock_spin(&smp_ipi_mtx);
543 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
545 /* NOTREACHED */ /* assuming reset worked */
548 #if defined(WITNESS) || defined(INVARIANTS)
549 static int kassert_warn_only = 0;
551 static int kassert_do_kdb = 0;
554 static int kassert_do_ktr = 0;
556 static int kassert_do_log = 1;
557 static int kassert_log_pps_limit = 4;
558 static int kassert_log_mute_at = 0;
559 static int kassert_log_panic_at = 0;
560 static int kassert_warnings = 0;
562 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options");
564 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RW | CTLFLAG_TUN,
565 &kassert_warn_only, 0,
566 "KASSERT triggers a panic (1) or just a warning (0)");
567 TUNABLE_INT("debug.kassert.warn_only", &kassert_warn_only);
570 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RW | CTLFLAG_TUN,
571 &kassert_do_kdb, 0, "KASSERT will enter the debugger");
572 TUNABLE_INT("debug.kassert.do_kdb", &kassert_do_kdb);
576 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RW | CTLFLAG_TUN,
578 "KASSERT does a KTR, set this to the KTRMASK you want");
579 TUNABLE_INT("debug.kassert.do_ktr", &kassert_do_ktr);
582 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RW | CTLFLAG_TUN,
583 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)");
584 TUNABLE_INT("debug.kassert.do_log", &kassert_do_log);
586 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RW | CTLFLAG_TUN,
587 &kassert_warnings, 0, "number of KASSERTs that have been triggered");
588 TUNABLE_INT("debug.kassert.warnings", &kassert_warnings);
590 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RW | CTLFLAG_TUN,
591 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
592 TUNABLE_INT("debug.kassert.log_panic_at", &kassert_log_panic_at);
594 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RW | CTLFLAG_TUN,
595 &kassert_log_pps_limit, 0, "limit number of log messages per second");
596 TUNABLE_INT("debug.kassert.log_pps_limit", &kassert_log_pps_limit);
598 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RW | CTLFLAG_TUN,
599 &kassert_log_mute_at, 0, "max number of KASSERTS to log");
600 TUNABLE_INT("debug.kassert.log_mute_at", &kassert_log_mute_at);
602 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
604 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
605 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0,
606 kassert_sysctl_kassert, "I", "set to trigger a test kassert");
609 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
613 error = sysctl_wire_old_buffer(req, sizeof(int));
616 error = sysctl_handle_int(oidp, &i, 0, req);
618 if (error != 0 || req->newptr == NULL)
620 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
625 * Called by KASSERT, this decides if we will panic
626 * or if we will log via printf and/or ktr.
629 kassert_panic(const char *fmt, ...)
631 static char buf[256];
635 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
639 * panic if we're not just warning, or if we've exceeded
640 * kassert_log_panic_at warnings.
642 if (!kassert_warn_only ||
643 (kassert_log_panic_at > 0 &&
644 kassert_warnings >= kassert_log_panic_at)) {
654 * log if we've not yet met the mute limit.
656 if (kassert_do_log &&
657 (kassert_log_mute_at == 0 ||
658 kassert_warnings < kassert_log_mute_at)) {
659 static struct timeval lasterr;
662 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
663 printf("KASSERT failed: %s\n", buf);
668 if (kassert_do_kdb) {
669 kdb_enter(KDB_WHY_KASSERT, buf);
672 atomic_add_int(&kassert_warnings, 1);
677 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
678 * and then reboots. If we are called twice, then we avoid trying to sync
679 * the disks as this often leads to recursive panics.
682 panic(const char *fmt, ...)
691 vpanic(const char *fmt, va_list ap)
696 struct thread *td = curthread;
697 int bootopt, newpanic;
698 static char buf[256];
704 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from
705 * concurrently entering panic. Only the winner will proceed
708 if (panicstr == NULL && !kdb_active) {
709 other_cpus = all_cpus;
710 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
711 stop_cpus_hard(other_cpus);
715 * We set stop_scheduler here and not in the block above,
716 * because we want to ensure that if panic has been called and
717 * stop_scheduler_on_panic is true, then stop_scheduler will
718 * always be set. Even if panic has been entered from kdb.
720 td->td_stopsched = 1;
723 bootopt = RB_AUTOBOOT;
726 bootopt |= RB_NOSYNC;
734 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
737 printf("panic: %s\n", buf);
744 printf("cpuid = %d\n", PCPU_GET(cpuid));
748 if (newpanic && trace_on_panic)
750 if (debugger_on_panic)
751 kdb_enter(KDB_WHY_PANIC, "panic");
753 /*thread_lock(td); */
754 td->td_flags |= TDF_INPANIC;
755 /* thread_unlock(td); */
757 bootopt |= RB_NOSYNC;
758 kern_reboot(bootopt);
762 * Support for poweroff delay.
764 * Please note that setting this delay too short might power off your machine
765 * before the write cache on your hard disk has been flushed, leading to
766 * soft-updates inconsistencies.
768 #ifndef POWEROFF_DELAY
769 # define POWEROFF_DELAY 5000
771 static int poweroff_delay = POWEROFF_DELAY;
773 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
774 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
777 poweroff_wait(void *junk, int howto)
780 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
782 DELAY(poweroff_delay * 1000);
786 * Some system processes (e.g. syncer) need to be stopped at appropriate
787 * points in their main loops prior to a system shutdown, so that they
788 * won't interfere with the shutdown process (e.g. by holding a disk buf
789 * to cause sync to fail). For each of these system processes, register
790 * shutdown_kproc() as a handler for one of shutdown events.
792 static int kproc_shutdown_wait = 60;
793 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
794 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
797 kproc_shutdown(void *arg, int howto)
805 p = (struct proc *)arg;
806 printf("Waiting (max %d seconds) for system process `%s' to stop...",
807 kproc_shutdown_wait, p->p_comm);
808 error = kproc_suspend(p, kproc_shutdown_wait * hz);
810 if (error == EWOULDBLOCK)
811 printf("timed out\n");
817 kthread_shutdown(void *arg, int howto)
825 td = (struct thread *)arg;
826 printf("Waiting (max %d seconds) for system thread `%s' to stop...",
827 kproc_shutdown_wait, td->td_name);
828 error = kthread_suspend(td, kproc_shutdown_wait * hz);
830 if (error == EWOULDBLOCK)
831 printf("timed out\n");
836 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)];
837 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD,
838 dumpdevname, 0, "Device for kernel dumps");
840 /* Registration of dumpers */
842 set_dumper(struct dumperinfo *di, const char *devname)
847 bzero(&dumper, sizeof dumper);
848 dumpdevname[0] = '\0';
851 if (dumper.dumper != NULL)
854 wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname));
855 if (wantcopy >= sizeof(dumpdevname)) {
856 printf("set_dumper: device name truncated from '%s' -> '%s'\n",
857 devname, dumpdevname);
862 /* Call dumper with bounds checking. */
864 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
865 off_t offset, size_t length)
868 if (length != 0 && (offset < di->mediaoffset ||
869 offset - di->mediaoffset + length > di->mediasize)) {
870 printf("Attempt to write outside dump device boundaries.\n"
871 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
872 (intmax_t)offset, (intmax_t)di->mediaoffset,
873 (uintmax_t)length, (intmax_t)di->mediasize);
876 return (di->dumper(di->priv, virtual, physical, offset, length));
880 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
881 uint64_t dumplen, uint32_t blksz)
884 bzero(kdh, sizeof(*kdh));
885 strlcpy(kdh->magic, magic, sizeof(kdh->magic));
886 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
887 kdh->version = htod32(KERNELDUMPVERSION);
888 kdh->architectureversion = htod32(archver);
889 kdh->dumplength = htod64(dumplen);
890 kdh->dumptime = htod64(time_second);
891 kdh->blocksize = htod32(blksz);
892 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
893 strlcpy(kdh->versionstring, version, sizeof(kdh->versionstring));
894 if (panicstr != NULL)
895 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
896 kdh->parity = kerneldump_parity(kdh);