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_panic.h" 43 #include "opt_sched.h" 44 #include "opt_watchdog.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/conf.h> 51 #include <sys/cons.h> 52 #include <sys/eventhandler.h> 53 #include <sys/filedesc.h> 54 #include <sys/jail.h> 55 #include <sys/kdb.h> 56 #include <sys/kernel.h> 57 #include <sys/kerneldump.h> 58 #include <sys/kthread.h> 59 #include <sys/ktr.h> 60 #include <sys/malloc.h> 61 #include <sys/mount.h> 62 #include <sys/priv.h> 63 #include <sys/proc.h> 64 #include <sys/reboot.h> 65 #include <sys/resourcevar.h> 66 #include <sys/rwlock.h> 67 #include <sys/sched.h> 68 #include <sys/smp.h> 69 #include <sys/sysctl.h> 70 #include <sys/sysproto.h> 71 #include <sys/vnode.h> 72 #include <sys/watchdog.h> 73 74 #include <ddb/ddb.h> 75 76 #include <machine/cpu.h> 77 #include <machine/dump.h> 78 #include <machine/pcb.h> 79 #include <machine/smp.h> 80 81 #include <security/mac/mac_framework.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_pager.h> 87 #include <vm/swap_pager.h> 88 89 #include <sys/signalvar.h> 90 91 #ifndef PANIC_REBOOT_WAIT_TIME 92 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 93 #endif 94 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME; 95 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN, 96 &panic_reboot_wait_time, 0, 97 "Seconds to wait before rebooting after a panic"); 98 99 /* 100 * Note that stdarg.h and the ANSI style va_start macro is used for both 101 * ANSI and traditional C compilers. 102 */ 103 #include <machine/stdarg.h> 104 105 #ifdef KDB 106 #ifdef KDB_UNATTENDED 107 int debugger_on_panic = 0; 108 #else 109 int debugger_on_panic = 1; 110 #endif 111 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 112 CTLFLAG_RWTUN | CTLFLAG_SECURE, 113 &debugger_on_panic, 0, "Run debugger on kernel panic"); 114 115 #ifdef KDB_TRACE 116 static int trace_on_panic = 1; 117 #else 118 static int trace_on_panic = 0; 119 #endif 120 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 121 CTLFLAG_RWTUN | CTLFLAG_SECURE, 122 &trace_on_panic, 0, "Print stack trace on kernel panic"); 123 #endif /* KDB */ 124 125 static int sync_on_panic = 0; 126 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN, 127 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 128 129 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 130 "Shutdown environment"); 131 132 #ifndef DIAGNOSTIC 133 static int show_busybufs; 134 #else 135 static int show_busybufs = 1; 136 #endif 137 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 138 &show_busybufs, 0, ""); 139 140 /* 141 * Variable panicstr contains argument to first call to panic; used as flag 142 * to indicate that the kernel has already called panic. 143 */ 144 const char *panicstr; 145 146 int dumping; /* system is dumping */ 147 int rebooting; /* system is rebooting */ 148 static struct dumperinfo dumper; /* our selected dumper */ 149 150 /* Context information for dump-debuggers. */ 151 static struct pcb dumppcb; /* Registers. */ 152 lwpid_t dumptid; /* Thread ID. */ 153 154 static struct cdevsw reroot_cdevsw = { 155 .d_version = D_VERSION, 156 .d_name = "reroot", 157 }; 158 159 static void poweroff_wait(void *, int); 160 static void shutdown_halt(void *junk, int howto); 161 static void shutdown_panic(void *junk, int howto); 162 static void shutdown_reset(void *junk, int howto); 163 static int kern_reroot(void); 164 165 /* register various local shutdown events */ 166 static void 167 shutdown_conf(void *unused) 168 { 169 170 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 171 SHUTDOWN_PRI_FIRST); 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); 178 } 179 180 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 181 182 /* 183 * The only reason this exists is to create the /dev/reroot/ directory, 184 * used by reroot code in init(8) as a mountpoint for tmpfs. 185 */ 186 static void 187 reroot_conf(void *unused) 188 { 189 int error; 190 struct cdev *cdev; 191 192 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev, 193 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot"); 194 if (error != 0) { 195 printf("%s: failed to create device node, error %d", 196 __func__, error); 197 } 198 } 199 200 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL); 201 202 /* 203 * The system call that results in a reboot. 204 */ 205 /* ARGSUSED */ 206 int 207 sys_reboot(struct thread *td, struct reboot_args *uap) 208 { 209 int error; 210 211 error = 0; 212 #ifdef MAC 213 error = mac_system_check_reboot(td->td_ucred, uap->opt); 214 #endif 215 if (error == 0) 216 error = priv_check(td, PRIV_REBOOT); 217 if (error == 0) { 218 if (uap->opt & RB_REROOT) { 219 error = kern_reroot(); 220 } else { 221 mtx_lock(&Giant); 222 kern_reboot(uap->opt); 223 mtx_unlock(&Giant); 224 } 225 } 226 return (error); 227 } 228 229 /* 230 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 231 */ 232 void 233 shutdown_nice(int howto) 234 { 235 236 if (initproc != NULL) { 237 /* Send a signal to init(8) and have it shutdown the world. */ 238 PROC_LOCK(initproc); 239 if (howto & RB_POWEROFF) 240 kern_psignal(initproc, SIGUSR2); 241 else if (howto & RB_HALT) 242 kern_psignal(initproc, SIGUSR1); 243 else 244 kern_psignal(initproc, SIGINT); 245 PROC_UNLOCK(initproc); 246 } else { 247 /* No init(8) running, so simply reboot. */ 248 kern_reboot(howto | RB_NOSYNC); 249 } 250 } 251 252 static void 253 print_uptime(void) 254 { 255 int f; 256 struct timespec ts; 257 258 getnanouptime(&ts); 259 printf("Uptime: "); 260 f = 0; 261 if (ts.tv_sec >= 86400) { 262 printf("%ldd", (long)ts.tv_sec / 86400); 263 ts.tv_sec %= 86400; 264 f = 1; 265 } 266 if (f || ts.tv_sec >= 3600) { 267 printf("%ldh", (long)ts.tv_sec / 3600); 268 ts.tv_sec %= 3600; 269 f = 1; 270 } 271 if (f || ts.tv_sec >= 60) { 272 printf("%ldm", (long)ts.tv_sec / 60); 273 ts.tv_sec %= 60; 274 f = 1; 275 } 276 printf("%lds\n", (long)ts.tv_sec); 277 } 278 279 int 280 doadump(boolean_t textdump) 281 { 282 boolean_t coredump; 283 int error; 284 285 error = 0; 286 if (dumping) 287 return (EBUSY); 288 if (dumper.dumper == NULL) 289 return (ENXIO); 290 291 savectx(&dumppcb); 292 dumptid = curthread->td_tid; 293 dumping++; 294 295 coredump = TRUE; 296 #ifdef DDB 297 if (textdump && textdump_pending) { 298 coredump = FALSE; 299 textdump_dumpsys(&dumper); 300 } 301 #endif 302 if (coredump) 303 error = dumpsys(&dumper); 304 305 dumping--; 306 return (error); 307 } 308 309 /* 310 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 311 */ 312 void 313 kern_reboot(int howto) 314 { 315 static int once = 0; 316 317 #if defined(SMP) 318 /* 319 * Bind us to CPU 0 so that all shutdown code runs there. Some 320 * systems don't shutdown properly (i.e., ACPI power off) if we 321 * run on another processor. 322 */ 323 if (!SCHEDULER_STOPPED()) { 324 thread_lock(curthread); 325 sched_bind(curthread, 0); 326 thread_unlock(curthread); 327 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 328 } 329 #endif 330 /* We're in the process of rebooting. */ 331 rebooting = 1; 332 333 /* We are out of the debugger now. */ 334 kdb_active = 0; 335 336 /* 337 * Do any callouts that should be done BEFORE syncing the filesystems. 338 */ 339 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 340 341 /* 342 * Now sync filesystems 343 */ 344 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) { 345 once = 1; 346 bufshutdown(show_busybufs); 347 } 348 349 print_uptime(); 350 351 cngrab(); 352 353 /* 354 * Ok, now do things that assume all filesystem activity has 355 * been completed. 356 */ 357 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 358 359 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 360 doadump(TRUE); 361 362 /* Now that we're going to really halt the system... */ 363 EVENTHANDLER_INVOKE(shutdown_final, howto); 364 365 for(;;) ; /* safety against shutdown_reset not working */ 366 /* NOTREACHED */ 367 } 368 369 /* 370 * The system call that results in changing the rootfs. 371 */ 372 static int 373 kern_reroot(void) 374 { 375 struct vnode *oldrootvnode, *vp; 376 struct mount *mp, *devmp; 377 int error; 378 379 if (curproc != initproc) 380 return (EPERM); 381 382 /* 383 * Mark the filesystem containing currently-running executable 384 * (the temporary copy of init(8)) busy. 385 */ 386 vp = curproc->p_textvp; 387 error = vn_lock(vp, LK_SHARED); 388 if (error != 0) 389 return (error); 390 mp = vp->v_mount; 391 error = vfs_busy(mp, MBF_NOWAIT); 392 if (error != 0) { 393 vfs_ref(mp); 394 VOP_UNLOCK(vp, 0); 395 error = vfs_busy(mp, 0); 396 vn_lock(vp, LK_SHARED | LK_RETRY); 397 vfs_rel(mp); 398 if (error != 0) { 399 VOP_UNLOCK(vp, 0); 400 return (ENOENT); 401 } 402 if (vp->v_iflag & VI_DOOMED) { 403 VOP_UNLOCK(vp, 0); 404 vfs_unbusy(mp); 405 return (ENOENT); 406 } 407 } 408 VOP_UNLOCK(vp, 0); 409 410 /* 411 * Remove the filesystem containing currently-running executable 412 * from the mount list, to prevent it from being unmounted 413 * by vfs_unmountall(), and to avoid confusing vfs_mountroot(). 414 * 415 * Also preserve /dev - forcibly unmounting it could cause driver 416 * reinitialization. 417 */ 418 419 vfs_ref(rootdevmp); 420 devmp = rootdevmp; 421 rootdevmp = NULL; 422 423 mtx_lock(&mountlist_mtx); 424 TAILQ_REMOVE(&mountlist, mp, mnt_list); 425 TAILQ_REMOVE(&mountlist, devmp, mnt_list); 426 mtx_unlock(&mountlist_mtx); 427 428 oldrootvnode = rootvnode; 429 430 /* 431 * Unmount everything except for the two filesystems preserved above. 432 */ 433 vfs_unmountall(); 434 435 /* 436 * Add /dev back; vfs_mountroot() will move it into its new place. 437 */ 438 mtx_lock(&mountlist_mtx); 439 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list); 440 mtx_unlock(&mountlist_mtx); 441 rootdevmp = devmp; 442 vfs_rel(rootdevmp); 443 444 /* 445 * Mount the new rootfs. 446 */ 447 vfs_mountroot(); 448 449 /* 450 * Update all references to the old rootvnode. 451 */ 452 mountcheckdirs(oldrootvnode, rootvnode); 453 454 /* 455 * Add the temporary filesystem back and unbusy it. 456 */ 457 mtx_lock(&mountlist_mtx); 458 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 459 mtx_unlock(&mountlist_mtx); 460 vfs_unbusy(mp); 461 462 return (0); 463 } 464 465 /* 466 * If the shutdown was a clean halt, behave accordingly. 467 */ 468 static void 469 shutdown_halt(void *junk, int howto) 470 { 471 472 if (howto & RB_HALT) { 473 printf("\n"); 474 printf("The operating system has halted.\n"); 475 printf("Please press any key to reboot.\n\n"); 476 switch (cngetc()) { 477 case -1: /* No console, just die */ 478 cpu_halt(); 479 /* NOTREACHED */ 480 default: 481 howto &= ~RB_HALT; 482 break; 483 } 484 } 485 } 486 487 /* 488 * Check to see if the system paniced, pause and then reboot 489 * according to the specified delay. 490 */ 491 static void 492 shutdown_panic(void *junk, int howto) 493 { 494 int loop; 495 496 if (howto & RB_DUMP) { 497 if (panic_reboot_wait_time != 0) { 498 if (panic_reboot_wait_time != -1) { 499 printf("Automatic reboot in %d seconds - " 500 "press a key on the console to abort\n", 501 panic_reboot_wait_time); 502 for (loop = panic_reboot_wait_time * 10; 503 loop > 0; --loop) { 504 DELAY(1000 * 100); /* 1/10th second */ 505 /* Did user type a key? */ 506 if (cncheckc() != -1) 507 break; 508 } 509 if (!loop) 510 return; 511 } 512 } else { /* zero time specified - reboot NOW */ 513 return; 514 } 515 printf("--> Press a key on the console to reboot,\n"); 516 printf("--> or switch off the system now.\n"); 517 cngetc(); 518 } 519 } 520 521 /* 522 * Everything done, now reset 523 */ 524 static void 525 shutdown_reset(void *junk, int howto) 526 { 527 528 printf("Rebooting...\n"); 529 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 530 531 /* 532 * Acquiring smp_ipi_mtx here has a double effect: 533 * - it disables interrupts avoiding CPU0 preemption 534 * by fast handlers (thus deadlocking against other CPUs) 535 * - it avoids deadlocks against smp_rendezvous() or, more 536 * generally, threads busy-waiting, with this spinlock held, 537 * and waiting for responses by threads on other CPUs 538 * (ie. smp_tlb_shootdown()). 539 * 540 * For the !SMP case it just needs to handle the former problem. 541 */ 542 #ifdef SMP 543 mtx_lock_spin(&smp_ipi_mtx); 544 #else 545 spinlock_enter(); 546 #endif 547 548 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 549 cpu_reset(); 550 /* NOTREACHED */ /* assuming reset worked */ 551 } 552 553 #if defined(WITNESS) || defined(INVARIANTS) 554 static int kassert_warn_only = 0; 555 #ifdef KDB 556 static int kassert_do_kdb = 0; 557 #endif 558 #ifdef KTR 559 static int kassert_do_ktr = 0; 560 #endif 561 static int kassert_do_log = 1; 562 static int kassert_log_pps_limit = 4; 563 static int kassert_log_mute_at = 0; 564 static int kassert_log_panic_at = 0; 565 static int kassert_warnings = 0; 566 567 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options"); 568 569 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RWTUN, 570 &kassert_warn_only, 0, 571 "KASSERT triggers a panic (1) or just a warning (0)"); 572 573 #ifdef KDB 574 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RWTUN, 575 &kassert_do_kdb, 0, "KASSERT will enter the debugger"); 576 #endif 577 578 #ifdef KTR 579 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RWTUN, 580 &kassert_do_ktr, 0, 581 "KASSERT does a KTR, set this to the KTRMASK you want"); 582 #endif 583 584 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RWTUN, 585 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)"); 586 587 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RWTUN, 588 &kassert_warnings, 0, "number of KASSERTs that have been triggered"); 589 590 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RWTUN, 591 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic"); 592 593 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RWTUN, 594 &kassert_log_pps_limit, 0, "limit number of log messages per second"); 595 596 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RWTUN, 597 &kassert_log_mute_at, 0, "max number of KASSERTS to log"); 598 599 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS); 600 601 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert, 602 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0, 603 kassert_sysctl_kassert, "I", "set to trigger a test kassert"); 604 605 static int 606 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS) 607 { 608 int error, i; 609 610 error = sysctl_wire_old_buffer(req, sizeof(int)); 611 if (error == 0) { 612 i = 0; 613 error = sysctl_handle_int(oidp, &i, 0, req); 614 } 615 if (error != 0 || req->newptr == NULL) 616 return (error); 617 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i)); 618 return (0); 619 } 620 621 /* 622 * Called by KASSERT, this decides if we will panic 623 * or if we will log via printf and/or ktr. 624 */ 625 void 626 kassert_panic(const char *fmt, ...) 627 { 628 static char buf[256]; 629 va_list ap; 630 631 va_start(ap, fmt); 632 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 633 va_end(ap); 634 635 /* 636 * panic if we're not just warning, or if we've exceeded 637 * kassert_log_panic_at warnings. 638 */ 639 if (!kassert_warn_only || 640 (kassert_log_panic_at > 0 && 641 kassert_warnings >= kassert_log_panic_at)) { 642 va_start(ap, fmt); 643 vpanic(fmt, ap); 644 /* NORETURN */ 645 } 646 #ifdef KTR 647 if (kassert_do_ktr) 648 CTR0(ktr_mask, buf); 649 #endif /* KTR */ 650 /* 651 * log if we've not yet met the mute limit. 652 */ 653 if (kassert_do_log && 654 (kassert_log_mute_at == 0 || 655 kassert_warnings < kassert_log_mute_at)) { 656 static struct timeval lasterr; 657 static int curerr; 658 659 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) { 660 printf("KASSERT failed: %s\n", buf); 661 kdb_backtrace(); 662 } 663 } 664 #ifdef KDB 665 if (kassert_do_kdb) { 666 kdb_enter(KDB_WHY_KASSERT, buf); 667 } 668 #endif 669 atomic_add_int(&kassert_warnings, 1); 670 } 671 #endif 672 673 /* 674 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 675 * and then reboots. If we are called twice, then we avoid trying to sync 676 * the disks as this often leads to recursive panics. 677 */ 678 void 679 panic(const char *fmt, ...) 680 { 681 va_list ap; 682 683 va_start(ap, fmt); 684 vpanic(fmt, ap); 685 } 686 687 void 688 vpanic(const char *fmt, va_list ap) 689 { 690 #ifdef SMP 691 cpuset_t other_cpus; 692 #endif 693 struct thread *td = curthread; 694 int bootopt, newpanic; 695 static char buf[256]; 696 697 spinlock_enter(); 698 699 #ifdef SMP 700 /* 701 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from 702 * concurrently entering panic. Only the winner will proceed 703 * further. 704 */ 705 if (panicstr == NULL && !kdb_active) { 706 other_cpus = all_cpus; 707 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 708 stop_cpus_hard(other_cpus); 709 } 710 711 /* 712 * Ensure that the scheduler is stopped while panicking, even if panic 713 * has been entered from kdb. 714 */ 715 td->td_stopsched = 1; 716 #endif 717 718 bootopt = RB_AUTOBOOT; 719 newpanic = 0; 720 if (panicstr) 721 bootopt |= RB_NOSYNC; 722 else { 723 bootopt |= RB_DUMP; 724 panicstr = fmt; 725 newpanic = 1; 726 } 727 728 if (newpanic) { 729 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 730 panicstr = buf; 731 cngrab(); 732 printf("panic: %s\n", buf); 733 } else { 734 printf("panic: "); 735 vprintf(fmt, ap); 736 printf("\n"); 737 } 738 #ifdef SMP 739 printf("cpuid = %d\n", PCPU_GET(cpuid)); 740 #endif 741 742 #ifdef KDB 743 if (newpanic && trace_on_panic) 744 kdb_backtrace(); 745 if (debugger_on_panic) 746 kdb_enter(KDB_WHY_PANIC, "panic"); 747 #endif 748 /*thread_lock(td); */ 749 td->td_flags |= TDF_INPANIC; 750 /* thread_unlock(td); */ 751 if (!sync_on_panic) 752 bootopt |= RB_NOSYNC; 753 kern_reboot(bootopt); 754 } 755 756 /* 757 * Support for poweroff delay. 758 * 759 * Please note that setting this delay too short might power off your machine 760 * before the write cache on your hard disk has been flushed, leading to 761 * soft-updates inconsistencies. 762 */ 763 #ifndef POWEROFF_DELAY 764 # define POWEROFF_DELAY 5000 765 #endif 766 static int poweroff_delay = POWEROFF_DELAY; 767 768 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 769 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 770 771 static void 772 poweroff_wait(void *junk, int howto) 773 { 774 775 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 776 return; 777 DELAY(poweroff_delay * 1000); 778 } 779 780 /* 781 * Some system processes (e.g. syncer) need to be stopped at appropriate 782 * points in their main loops prior to a system shutdown, so that they 783 * won't interfere with the shutdown process (e.g. by holding a disk buf 784 * to cause sync to fail). For each of these system processes, register 785 * shutdown_kproc() as a handler for one of shutdown events. 786 */ 787 static int kproc_shutdown_wait = 60; 788 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 789 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 790 791 void 792 kproc_shutdown(void *arg, int howto) 793 { 794 struct proc *p; 795 int error; 796 797 if (panicstr) 798 return; 799 800 p = (struct proc *)arg; 801 printf("Waiting (max %d seconds) for system process `%s' to stop...", 802 kproc_shutdown_wait, p->p_comm); 803 error = kproc_suspend(p, kproc_shutdown_wait * hz); 804 805 if (error == EWOULDBLOCK) 806 printf("timed out\n"); 807 else 808 printf("done\n"); 809 } 810 811 void 812 kthread_shutdown(void *arg, int howto) 813 { 814 struct thread *td; 815 int error; 816 817 if (panicstr) 818 return; 819 820 td = (struct thread *)arg; 821 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 822 kproc_shutdown_wait, td->td_name); 823 error = kthread_suspend(td, kproc_shutdown_wait * hz); 824 825 if (error == EWOULDBLOCK) 826 printf("timed out\n"); 827 else 828 printf("done\n"); 829 } 830 831 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)]; 832 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD, 833 dumpdevname, 0, "Device for kernel dumps"); 834 835 /* Registration of dumpers */ 836 int 837 set_dumper(struct dumperinfo *di, const char *devname, struct thread *td) 838 { 839 size_t wantcopy; 840 int error; 841 842 error = priv_check(td, PRIV_SETDUMPER); 843 if (error != 0) 844 return (error); 845 846 if (di == NULL) { 847 bzero(&dumper, sizeof dumper); 848 dumpdevname[0] = '\0'; 849 return (0); 850 } 851 if (dumper.dumper != NULL) 852 return (EBUSY); 853 dumper = *di; 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); 858 } 859 return (0); 860 } 861 862 /* Call dumper with bounds checking. */ 863 int 864 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 865 off_t offset, size_t length) 866 { 867 868 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); 874 return (ENOSPC); 875 } 876 return (di->dumper(di->priv, virtual, physical, offset, length)); 877 } 878 879 void 880 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 881 uint64_t dumplen, uint32_t blksz) 882 { 883 884 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); 897 } 898