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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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>
53 #include <sys/filedesc.h>
56 #include <sys/kernel.h>
57 #include <sys/kerneldump.h>
58 #include <sys/kthread.h>
60 #include <sys/malloc.h>
61 #include <sys/mount.h>
64 #include <sys/reboot.h>
65 #include <sys/resourcevar.h>
66 #include <sys/rwlock.h>
67 #include <sys/sched.h>
69 #include <sys/sysctl.h>
70 #include <sys/sysproto.h>
71 #include <sys/taskqueue.h>
72 #include <sys/vnode.h>
73 #include <sys/watchdog.h>
77 #include <machine/cpu.h>
78 #include <machine/dump.h>
79 #include <machine/pcb.h>
80 #include <machine/smp.h>
82 #include <security/mac/mac_framework.h>
85 #include <vm/vm_object.h>
86 #include <vm/vm_page.h>
87 #include <vm/vm_pager.h>
88 #include <vm/swap_pager.h>
90 #include <sys/signalvar.h>
92 static MALLOC_DEFINE(M_DUMPER, "dumper", "dumper block buffer");
94 #ifndef PANIC_REBOOT_WAIT_TIME
95 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
97 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME;
98 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN,
99 &panic_reboot_wait_time, 0,
100 "Seconds to wait before rebooting after a panic");
103 * Note that stdarg.h and the ANSI style va_start macro is used for both
104 * ANSI and traditional C compilers.
106 #include <machine/stdarg.h>
109 #ifdef KDB_UNATTENDED
110 static int debugger_on_panic = 0;
112 static int debugger_on_panic = 1;
114 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic,
115 CTLFLAG_RWTUN | CTLFLAG_SECURE,
116 &debugger_on_panic, 0, "Run debugger on kernel panic");
118 int debugger_on_trap = 0;
119 SYSCTL_INT(_debug, OID_AUTO, debugger_on_trap,
120 CTLFLAG_RWTUN | CTLFLAG_SECURE,
121 &debugger_on_trap, 0, "Run debugger on kernel trap before panic");
124 static int trace_on_panic = 1;
126 static int trace_on_panic = 0;
128 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
129 CTLFLAG_RWTUN | CTLFLAG_SECURE,
130 &trace_on_panic, 0, "Print stack trace on kernel panic");
133 static int sync_on_panic = 0;
134 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN,
135 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
137 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0,
138 "Shutdown environment");
141 static int show_busybufs;
143 static int show_busybufs = 1;
145 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
146 &show_busybufs, 0, "");
148 int suspend_blocked = 0;
149 SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW,
150 &suspend_blocked, 0, "Block suspend due to a pending shutdown");
153 * Variable panicstr contains argument to first call to panic; used as flag
154 * to indicate that the kernel has already called panic.
156 const char *panicstr;
158 int dumping; /* system is dumping */
159 int rebooting; /* system is rebooting */
160 static struct dumperinfo dumper; /* our selected dumper */
162 /* Context information for dump-debuggers. */
163 static struct pcb dumppcb; /* Registers. */
164 lwpid_t dumptid; /* Thread ID. */
166 static struct cdevsw reroot_cdevsw = {
167 .d_version = D_VERSION,
171 static void poweroff_wait(void *, int);
172 static void shutdown_halt(void *junk, int howto);
173 static void shutdown_panic(void *junk, int howto);
174 static void shutdown_reset(void *junk, int howto);
175 static int kern_reroot(void);
177 /* register various local shutdown events */
179 shutdown_conf(void *unused)
182 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
184 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
185 SHUTDOWN_PRI_LAST + 100);
186 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
187 SHUTDOWN_PRI_LAST + 100);
188 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
189 SHUTDOWN_PRI_LAST + 200);
192 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
195 * The only reason this exists is to create the /dev/reroot/ directory,
196 * used by reroot code in init(8) as a mountpoint for tmpfs.
199 reroot_conf(void *unused)
204 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev,
205 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot");
207 printf("%s: failed to create device node, error %d",
212 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL);
215 * The system call that results in a reboot.
219 sys_reboot(struct thread *td, struct reboot_args *uap)
225 error = mac_system_check_reboot(td->td_ucred, uap->opt);
228 error = priv_check(td, PRIV_REBOOT);
230 if (uap->opt & RB_REROOT) {
231 error = kern_reroot();
234 kern_reboot(uap->opt);
242 shutdown_nice_task_fn(void *arg, int pending __unused)
246 howto = (uintptr_t)arg;
247 /* Send a signal to init(8) and have it shutdown the world. */
249 if (howto & RB_POWEROFF)
250 kern_psignal(initproc, SIGUSR2);
251 else if (howto & RB_HALT)
252 kern_psignal(initproc, SIGUSR1);
254 kern_psignal(initproc, SIGINT);
255 PROC_UNLOCK(initproc);
258 static struct task shutdown_nice_task = TASK_INITIALIZER(0,
259 &shutdown_nice_task_fn, NULL);
262 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
265 shutdown_nice(int howto)
268 if (initproc != NULL && !SCHEDULER_STOPPED()) {
269 shutdown_nice_task.ta_context = (void *)(uintptr_t)howto;
270 taskqueue_enqueue(taskqueue_fast, &shutdown_nice_task);
273 * No init(8) running, or scheduler would not allow it
274 * to run, so simply reboot.
276 kern_reboot(howto | RB_NOSYNC);
289 if (ts.tv_sec >= 86400) {
290 printf("%ldd", (long)ts.tv_sec / 86400);
294 if (f || ts.tv_sec >= 3600) {
295 printf("%ldh", (long)ts.tv_sec / 3600);
299 if (f || ts.tv_sec >= 60) {
300 printf("%ldm", (long)ts.tv_sec / 60);
304 printf("%lds\n", (long)ts.tv_sec);
308 doadump(boolean_t textdump)
316 if (dumper.dumper == NULL)
320 dumptid = curthread->td_tid;
325 if (textdump && textdump_pending) {
327 textdump_dumpsys(&dumper);
331 error = dumpsys(&dumper);
338 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
341 kern_reboot(int howto)
347 * Bind us to CPU 0 so that all shutdown code runs there. Some
348 * systems don't shutdown properly (i.e., ACPI power off) if we
349 * run on another processor.
351 if (!SCHEDULER_STOPPED()) {
352 thread_lock(curthread);
353 sched_bind(curthread, 0);
354 thread_unlock(curthread);
355 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
358 /* We're in the process of rebooting. */
361 /* We are out of the debugger now. */
365 * Do any callouts that should be done BEFORE syncing the filesystems.
367 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
370 * Now sync filesystems
372 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) {
374 bufshutdown(show_busybufs);
382 * Ok, now do things that assume all filesystem activity has
385 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
387 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
390 /* Now that we're going to really halt the system... */
391 EVENTHANDLER_INVOKE(shutdown_final, howto);
393 for(;;) ; /* safety against shutdown_reset not working */
398 * The system call that results in changing the rootfs.
403 struct vnode *oldrootvnode, *vp;
404 struct mount *mp, *devmp;
407 if (curproc != initproc)
411 * Mark the filesystem containing currently-running executable
412 * (the temporary copy of init(8)) busy.
414 vp = curproc->p_textvp;
415 error = vn_lock(vp, LK_SHARED);
419 error = vfs_busy(mp, MBF_NOWAIT);
423 error = vfs_busy(mp, 0);
424 vn_lock(vp, LK_SHARED | LK_RETRY);
430 if (vp->v_iflag & VI_DOOMED) {
439 * Remove the filesystem containing currently-running executable
440 * from the mount list, to prevent it from being unmounted
441 * by vfs_unmountall(), and to avoid confusing vfs_mountroot().
443 * Also preserve /dev - forcibly unmounting it could cause driver
451 mtx_lock(&mountlist_mtx);
452 TAILQ_REMOVE(&mountlist, mp, mnt_list);
453 TAILQ_REMOVE(&mountlist, devmp, mnt_list);
454 mtx_unlock(&mountlist_mtx);
456 oldrootvnode = rootvnode;
459 * Unmount everything except for the two filesystems preserved above.
464 * Add /dev back; vfs_mountroot() will move it into its new place.
466 mtx_lock(&mountlist_mtx);
467 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list);
468 mtx_unlock(&mountlist_mtx);
473 * Mount the new rootfs.
478 * Update all references to the old rootvnode.
480 mountcheckdirs(oldrootvnode, rootvnode);
483 * Add the temporary filesystem back and unbusy it.
485 mtx_lock(&mountlist_mtx);
486 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
487 mtx_unlock(&mountlist_mtx);
494 * If the shutdown was a clean halt, behave accordingly.
497 shutdown_halt(void *junk, int howto)
500 if (howto & RB_HALT) {
502 printf("The operating system has halted.\n");
503 printf("Please press any key to reboot.\n\n");
505 case -1: /* No console, just die */
516 * Check to see if the system paniced, pause and then reboot
517 * according to the specified delay.
520 shutdown_panic(void *junk, int howto)
524 if (howto & RB_DUMP) {
525 if (panic_reboot_wait_time != 0) {
526 if (panic_reboot_wait_time != -1) {
527 printf("Automatic reboot in %d seconds - "
528 "press a key on the console to abort\n",
529 panic_reboot_wait_time);
530 for (loop = panic_reboot_wait_time * 10;
532 DELAY(1000 * 100); /* 1/10th second */
533 /* Did user type a key? */
534 if (cncheckc() != -1)
540 } else { /* zero time specified - reboot NOW */
543 printf("--> Press a key on the console to reboot,\n");
544 printf("--> or switch off the system now.\n");
550 * Everything done, now reset
553 shutdown_reset(void *junk, int howto)
556 printf("Rebooting...\n");
557 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
560 * Acquiring smp_ipi_mtx here has a double effect:
561 * - it disables interrupts avoiding CPU0 preemption
562 * by fast handlers (thus deadlocking against other CPUs)
563 * - it avoids deadlocks against smp_rendezvous() or, more
564 * generally, threads busy-waiting, with this spinlock held,
565 * and waiting for responses by threads on other CPUs
566 * (ie. smp_tlb_shootdown()).
568 * For the !SMP case it just needs to handle the former problem.
571 mtx_lock_spin(&smp_ipi_mtx);
576 /* cpu_boot(howto); */ /* doesn't do anything at the moment */
578 /* NOTREACHED */ /* assuming reset worked */
581 #if defined(WITNESS) || defined(INVARIANT_SUPPORT)
582 static int kassert_warn_only = 0;
584 static int kassert_do_kdb = 0;
587 static int kassert_do_ktr = 0;
589 static int kassert_do_log = 1;
590 static int kassert_log_pps_limit = 4;
591 static int kassert_log_mute_at = 0;
592 static int kassert_log_panic_at = 0;
593 static int kassert_warnings = 0;
595 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options");
597 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RWTUN,
598 &kassert_warn_only, 0,
599 "KASSERT triggers a panic (1) or just a warning (0)");
602 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RWTUN,
603 &kassert_do_kdb, 0, "KASSERT will enter the debugger");
607 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RWTUN,
609 "KASSERT does a KTR, set this to the KTRMASK you want");
612 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RWTUN,
613 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)");
615 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RWTUN,
616 &kassert_warnings, 0, "number of KASSERTs that have been triggered");
618 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RWTUN,
619 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
621 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RWTUN,
622 &kassert_log_pps_limit, 0, "limit number of log messages per second");
624 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RWTUN,
625 &kassert_log_mute_at, 0, "max number of KASSERTS to log");
627 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
629 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
630 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0,
631 kassert_sysctl_kassert, "I", "set to trigger a test kassert");
634 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
638 error = sysctl_wire_old_buffer(req, sizeof(int));
641 error = sysctl_handle_int(oidp, &i, 0, req);
643 if (error != 0 || req->newptr == NULL)
645 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
650 * Called by KASSERT, this decides if we will panic
651 * or if we will log via printf and/or ktr.
654 kassert_panic(const char *fmt, ...)
656 static char buf[256];
660 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
664 * panic if we're not just warning, or if we've exceeded
665 * kassert_log_panic_at warnings.
667 if (!kassert_warn_only ||
668 (kassert_log_panic_at > 0 &&
669 kassert_warnings >= kassert_log_panic_at)) {
679 * log if we've not yet met the mute limit.
681 if (kassert_do_log &&
682 (kassert_log_mute_at == 0 ||
683 kassert_warnings < kassert_log_mute_at)) {
684 static struct timeval lasterr;
687 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
688 printf("KASSERT failed: %s\n", buf);
693 if (kassert_do_kdb) {
694 kdb_enter(KDB_WHY_KASSERT, buf);
697 atomic_add_int(&kassert_warnings, 1);
702 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
703 * and then reboots. If we are called twice, then we avoid trying to sync
704 * the disks as this often leads to recursive panics.
707 panic(const char *fmt, ...)
716 vpanic(const char *fmt, va_list ap)
721 struct thread *td = curthread;
722 int bootopt, newpanic;
723 static char buf[256];
729 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from
730 * concurrently entering panic. Only the winner will proceed
733 if (panicstr == NULL && !kdb_active) {
734 other_cpus = all_cpus;
735 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
736 stop_cpus_hard(other_cpus);
741 * Ensure that the scheduler is stopped while panicking, even if panic
742 * has been entered from kdb.
744 td->td_stopsched = 1;
746 bootopt = RB_AUTOBOOT;
749 bootopt |= RB_NOSYNC;
757 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
760 printf("panic: %s\n", buf);
767 printf("cpuid = %d\n", PCPU_GET(cpuid));
771 if (newpanic && trace_on_panic)
773 if (debugger_on_panic)
774 kdb_enter(KDB_WHY_PANIC, "panic");
776 /*thread_lock(td); */
777 td->td_flags |= TDF_INPANIC;
778 /* thread_unlock(td); */
780 bootopt |= RB_NOSYNC;
781 kern_reboot(bootopt);
785 * Support for poweroff delay.
787 * Please note that setting this delay too short might power off your machine
788 * before the write cache on your hard disk has been flushed, leading to
789 * soft-updates inconsistencies.
791 #ifndef POWEROFF_DELAY
792 # define POWEROFF_DELAY 5000
794 static int poweroff_delay = POWEROFF_DELAY;
796 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
797 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
800 poweroff_wait(void *junk, int howto)
803 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
805 DELAY(poweroff_delay * 1000);
809 * Some system processes (e.g. syncer) need to be stopped at appropriate
810 * points in their main loops prior to a system shutdown, so that they
811 * won't interfere with the shutdown process (e.g. by holding a disk buf
812 * to cause sync to fail). For each of these system processes, register
813 * shutdown_kproc() as a handler for one of shutdown events.
815 static int kproc_shutdown_wait = 60;
816 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
817 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
820 kproc_shutdown(void *arg, int howto)
828 p = (struct proc *)arg;
829 printf("Waiting (max %d seconds) for system process `%s' to stop... ",
830 kproc_shutdown_wait, p->p_comm);
831 error = kproc_suspend(p, kproc_shutdown_wait * hz);
833 if (error == EWOULDBLOCK)
834 printf("timed out\n");
840 kthread_shutdown(void *arg, int howto)
848 td = (struct thread *)arg;
849 printf("Waiting (max %d seconds) for system thread `%s' to stop... ",
850 kproc_shutdown_wait, td->td_name);
851 error = kthread_suspend(td, kproc_shutdown_wait * hz);
853 if (error == EWOULDBLOCK)
854 printf("timed out\n");
859 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)];
860 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD,
861 dumpdevname, 0, "Device for kernel dumps");
863 /* Registration of dumpers */
865 set_dumper(struct dumperinfo *di, const char *devname, struct thread *td)
870 error = priv_check(td, PRIV_SETDUMPER);
875 if (dumper.blockbuf != NULL)
876 free(dumper.blockbuf, M_DUMPER);
877 bzero(&dumper, sizeof(dumper));
878 dumpdevname[0] = '\0';
881 if (dumper.dumper != NULL)
884 wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname));
885 if (wantcopy >= sizeof(dumpdevname)) {
886 printf("set_dumper: device name truncated from '%s' -> '%s'\n",
887 devname, dumpdevname);
889 dumper.blockbuf = malloc(di->blocksize, M_DUMPER, M_WAITOK | M_ZERO);
893 /* Call dumper with bounds checking. */
895 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
896 off_t offset, size_t length)
899 if (length != 0 && (offset < di->mediaoffset ||
900 offset - di->mediaoffset + length > di->mediasize)) {
901 printf("Attempt to write outside dump device boundaries.\n"
902 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
903 (intmax_t)offset, (intmax_t)di->mediaoffset,
904 (uintmax_t)length, (intmax_t)di->mediasize);
907 return (di->dumper(di->priv, virtual, physical, offset, length));
910 /* Call dumper with bounds checking. */
912 dump_write_pad(struct dumperinfo *di, void *virtual, vm_offset_t physical,
913 off_t offset, size_t length, size_t *size)
918 if (length > di->blocksize)
921 *size = di->blocksize;
922 if (length == di->blocksize)
926 memset(temp + length, 0, di->blocksize - length);
927 memcpy(temp, virtual, length);
929 ret = dump_write(di, temp, physical, offset, *size);
936 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
937 uint64_t dumplen, uint32_t blksz)
941 bzero(kdh, sizeof(*kdh));
942 strlcpy(kdh->magic, magic, sizeof(kdh->magic));
943 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
944 kdh->version = htod32(KERNELDUMPVERSION);
945 kdh->architectureversion = htod32(archver);
946 kdh->dumplength = htod64(dumplen);
947 kdh->dumptime = htod64(time_second);
948 kdh->blocksize = htod32(blksz);
949 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
950 dstsize = sizeof(kdh->versionstring);
951 if (strlcpy(kdh->versionstring, version, dstsize) >= dstsize)
952 kdh->versionstring[dstsize - 2] = '\n';
953 if (panicstr != NULL)
954 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
955 kdh->parity = kerneldump_parity(kdh);
959 DB_SHOW_COMMAND(panic, db_show_panic)
962 if (panicstr == NULL)
963 db_printf("panicstr not set\n");
965 db_printf("panic: %s\n", panicstr);