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/jail.h> 54 #include <sys/kdb.h> 55 #include <sys/kernel.h> 56 #include <sys/kerneldump.h> 57 #include <sys/kthread.h> 58 #include <sys/ktr.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/priv.h> 62 #include <sys/proc.h> 63 #include <sys/reboot.h> 64 #include <sys/resourcevar.h> 65 #include <sys/rwlock.h> 66 #include <sys/sched.h> 67 #include <sys/smp.h> 68 #include <sys/sysctl.h> 69 #include <sys/sysproto.h> 70 #include <sys/vnode.h> 71 #include <sys/watchdog.h> 72 73 #include <ddb/ddb.h> 74 75 #include <machine/cpu.h> 76 #include <machine/pcb.h> 77 #include <machine/smp.h> 78 79 #include <security/mac/mac_framework.h> 80 81 #include <vm/vm.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> 86 87 #include <sys/signalvar.h> 88 89 #ifndef PANIC_REBOOT_WAIT_TIME 90 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 91 #endif 92 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME; 93 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN, 94 &panic_reboot_wait_time, 0, 95 "Seconds to wait before rebooting after a panic"); 96 97 /* 98 * Note that stdarg.h and the ANSI style va_start macro is used for both 99 * ANSI and traditional C compilers. 100 */ 101 #include <machine/stdarg.h> 102 103 #ifdef KDB 104 #ifdef KDB_UNATTENDED 105 int debugger_on_panic = 0; 106 #else 107 int debugger_on_panic = 1; 108 #endif 109 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 110 CTLFLAG_RWTUN | CTLFLAG_SECURE, 111 &debugger_on_panic, 0, "Run debugger on kernel panic"); 112 113 #ifdef KDB_TRACE 114 static int trace_on_panic = 1; 115 #else 116 static int trace_on_panic = 0; 117 #endif 118 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 119 CTLFLAG_RWTUN | CTLFLAG_SECURE, 120 &trace_on_panic, 0, "Print stack trace on kernel panic"); 121 #endif /* KDB */ 122 123 static int sync_on_panic = 0; 124 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN, 125 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 126 127 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 128 "Shutdown environment"); 129 130 #ifndef DIAGNOSTIC 131 static int show_busybufs; 132 #else 133 static int show_busybufs = 1; 134 #endif 135 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 136 &show_busybufs, 0, ""); 137 138 /* 139 * Variable panicstr contains argument to first call to panic; used as flag 140 * to indicate that the kernel has already called panic. 141 */ 142 const char *panicstr; 143 144 int dumping; /* system is dumping */ 145 int rebooting; /* system is rebooting */ 146 static struct dumperinfo dumper; /* our selected dumper */ 147 148 /* Context information for dump-debuggers. */ 149 static struct pcb dumppcb; /* Registers. */ 150 lwpid_t dumptid; /* Thread ID. */ 151 152 static void poweroff_wait(void *, int); 153 static void shutdown_halt(void *junk, int howto); 154 static void shutdown_panic(void *junk, int howto); 155 static void shutdown_reset(void *junk, int howto); 156 static void vpanic(const char *fmt, va_list ap) __dead2; 157 158 /* register various local shutdown events */ 159 static void 160 shutdown_conf(void *unused) 161 { 162 163 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 164 SHUTDOWN_PRI_FIRST); 165 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 166 SHUTDOWN_PRI_LAST + 100); 167 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 168 SHUTDOWN_PRI_LAST + 100); 169 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 170 SHUTDOWN_PRI_LAST + 200); 171 } 172 173 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 174 175 /* 176 * The system call that results in a reboot. 177 */ 178 /* ARGSUSED */ 179 int 180 sys_reboot(struct thread *td, struct reboot_args *uap) 181 { 182 int error; 183 184 error = 0; 185 #ifdef MAC 186 error = mac_system_check_reboot(td->td_ucred, uap->opt); 187 #endif 188 if (error == 0) 189 error = priv_check(td, PRIV_REBOOT); 190 if (error == 0) { 191 mtx_lock(&Giant); 192 kern_reboot(uap->opt); 193 mtx_unlock(&Giant); 194 } 195 return (error); 196 } 197 198 /* 199 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 200 */ 201 void 202 shutdown_nice(int howto) 203 { 204 205 if (initproc != NULL) { 206 /* Send a signal to init(8) and have it shutdown the world. */ 207 PROC_LOCK(initproc); 208 if (howto & RB_POWEROFF) 209 kern_psignal(initproc, SIGUSR2); 210 else if (howto & RB_HALT) 211 kern_psignal(initproc, SIGUSR1); 212 else 213 kern_psignal(initproc, SIGINT); 214 PROC_UNLOCK(initproc); 215 } else { 216 /* No init(8) running, so simply reboot. */ 217 kern_reboot(howto | RB_NOSYNC); 218 } 219 } 220 221 static void 222 print_uptime(void) 223 { 224 int f; 225 struct timespec ts; 226 227 getnanouptime(&ts); 228 printf("Uptime: "); 229 f = 0; 230 if (ts.tv_sec >= 86400) { 231 printf("%ldd", (long)ts.tv_sec / 86400); 232 ts.tv_sec %= 86400; 233 f = 1; 234 } 235 if (f || ts.tv_sec >= 3600) { 236 printf("%ldh", (long)ts.tv_sec / 3600); 237 ts.tv_sec %= 3600; 238 f = 1; 239 } 240 if (f || ts.tv_sec >= 60) { 241 printf("%ldm", (long)ts.tv_sec / 60); 242 ts.tv_sec %= 60; 243 f = 1; 244 } 245 printf("%lds\n", (long)ts.tv_sec); 246 } 247 248 int 249 doadump(boolean_t textdump) 250 { 251 boolean_t coredump; 252 253 if (dumping) 254 return (EBUSY); 255 if (dumper.dumper == NULL) 256 return (ENXIO); 257 258 savectx(&dumppcb); 259 dumptid = curthread->td_tid; 260 dumping++; 261 262 coredump = TRUE; 263 #ifdef DDB 264 if (textdump && textdump_pending) { 265 coredump = FALSE; 266 textdump_dumpsys(&dumper); 267 } 268 #endif 269 if (coredump) 270 dumpsys(&dumper); 271 272 dumping--; 273 return (0); 274 } 275 276 static int 277 isbufbusy(struct buf *bp) 278 { 279 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 280 BUF_ISLOCKED(bp)) || 281 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 282 return (1); 283 return (0); 284 } 285 286 /* 287 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 288 */ 289 void 290 kern_reboot(int howto) 291 { 292 static int first_buf_printf = 1; 293 static int waittime = -1; 294 295 #if defined(SMP) 296 /* 297 * Bind us to CPU 0 so that all shutdown code runs there. Some 298 * systems don't shutdown properly (i.e., ACPI power off) if we 299 * run on another processor. 300 */ 301 if (!SCHEDULER_STOPPED()) { 302 thread_lock(curthread); 303 sched_bind(curthread, 0); 304 thread_unlock(curthread); 305 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 306 } 307 #endif 308 /* We're in the process of rebooting. */ 309 rebooting = 1; 310 311 /* We are out of the debugger now. */ 312 kdb_active = 0; 313 314 /* 315 * Do any callouts that should be done BEFORE syncing the filesystems. 316 */ 317 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 318 319 /* 320 * Now sync filesystems 321 */ 322 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 323 register struct buf *bp; 324 int iter, nbusy, pbusy; 325 #ifndef PREEMPTION 326 int subiter; 327 #endif 328 329 waittime = 0; 330 331 wdog_kern_pat(WD_LASTVAL); 332 sys_sync(curthread, NULL); 333 334 /* 335 * With soft updates, some buffers that are 336 * written will be remarked as dirty until other 337 * buffers are written. 338 */ 339 for (iter = pbusy = 0; iter < 20; iter++) { 340 nbusy = 0; 341 for (bp = &buf[nbuf]; --bp >= buf; ) 342 if (isbufbusy(bp)) 343 nbusy++; 344 if (nbusy == 0) { 345 if (first_buf_printf) 346 printf("All buffers synced."); 347 break; 348 } 349 if (first_buf_printf) { 350 printf("Syncing disks, buffers remaining... "); 351 first_buf_printf = 0; 352 } 353 printf("%d ", nbusy); 354 if (nbusy < pbusy) 355 iter = 0; 356 pbusy = nbusy; 357 358 wdog_kern_pat(WD_LASTVAL); 359 sys_sync(curthread, NULL); 360 361 #ifdef PREEMPTION 362 /* 363 * Drop Giant and spin for a while to allow 364 * interrupt threads to run. 365 */ 366 DROP_GIANT(); 367 DELAY(50000 * iter); 368 PICKUP_GIANT(); 369 #else 370 /* 371 * Drop Giant and context switch several times to 372 * allow interrupt threads to run. 373 */ 374 DROP_GIANT(); 375 for (subiter = 0; subiter < 50 * iter; subiter++) { 376 thread_lock(curthread); 377 mi_switch(SW_VOL, NULL); 378 thread_unlock(curthread); 379 DELAY(1000); 380 } 381 PICKUP_GIANT(); 382 #endif 383 } 384 printf("\n"); 385 /* 386 * Count only busy local buffers to prevent forcing 387 * a fsck if we're just a client of a wedged NFS server 388 */ 389 nbusy = 0; 390 for (bp = &buf[nbuf]; --bp >= buf; ) { 391 if (isbufbusy(bp)) { 392 #if 0 393 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 394 if (bp->b_dev == NULL) { 395 TAILQ_REMOVE(&mountlist, 396 bp->b_vp->v_mount, mnt_list); 397 continue; 398 } 399 #endif 400 nbusy++; 401 if (show_busybufs > 0) { 402 printf( 403 "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:", 404 nbusy, bp, bp->b_vp, bp->b_flags, 405 (intmax_t)bp->b_blkno, 406 (intmax_t)bp->b_lblkno); 407 BUF_LOCKPRINTINFO(bp); 408 if (show_busybufs > 1) 409 vn_printf(bp->b_vp, 410 "vnode content: "); 411 } 412 } 413 } 414 if (nbusy) { 415 /* 416 * Failed to sync all blocks. Indicate this and don't 417 * unmount filesystems (thus forcing an fsck on reboot). 418 */ 419 printf("Giving up on %d buffers\n", nbusy); 420 DELAY(5000000); /* 5 seconds */ 421 } else { 422 if (!first_buf_printf) 423 printf("Final sync complete\n"); 424 /* 425 * Unmount filesystems 426 */ 427 if (panicstr == 0) 428 vfs_unmountall(); 429 } 430 swapoff_all(); 431 DELAY(100000); /* wait for console output to finish */ 432 } 433 434 print_uptime(); 435 436 cngrab(); 437 438 /* 439 * Ok, now do things that assume all filesystem activity has 440 * been completed. 441 */ 442 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 443 444 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 445 doadump(TRUE); 446 447 /* Now that we're going to really halt the system... */ 448 EVENTHANDLER_INVOKE(shutdown_final, howto); 449 450 for(;;) ; /* safety against shutdown_reset not working */ 451 /* NOTREACHED */ 452 } 453 454 /* 455 * If the shutdown was a clean halt, behave accordingly. 456 */ 457 static void 458 shutdown_halt(void *junk, int howto) 459 { 460 461 if (howto & RB_HALT) { 462 printf("\n"); 463 printf("The operating system has halted.\n"); 464 printf("Please press any key to reboot.\n\n"); 465 switch (cngetc()) { 466 case -1: /* No console, just die */ 467 cpu_halt(); 468 /* NOTREACHED */ 469 default: 470 howto &= ~RB_HALT; 471 break; 472 } 473 } 474 } 475 476 /* 477 * Check to see if the system paniced, pause and then reboot 478 * according to the specified delay. 479 */ 480 static void 481 shutdown_panic(void *junk, int howto) 482 { 483 int loop; 484 485 if (howto & RB_DUMP) { 486 if (panic_reboot_wait_time != 0) { 487 if (panic_reboot_wait_time != -1) { 488 printf("Automatic reboot in %d seconds - " 489 "press a key on the console to abort\n", 490 panic_reboot_wait_time); 491 for (loop = panic_reboot_wait_time * 10; 492 loop > 0; --loop) { 493 DELAY(1000 * 100); /* 1/10th second */ 494 /* Did user type a key? */ 495 if (cncheckc() != -1) 496 break; 497 } 498 if (!loop) 499 return; 500 } 501 } else { /* zero time specified - reboot NOW */ 502 return; 503 } 504 printf("--> Press a key on the console to reboot,\n"); 505 printf("--> or switch off the system now.\n"); 506 cngetc(); 507 } 508 } 509 510 /* 511 * Everything done, now reset 512 */ 513 static void 514 shutdown_reset(void *junk, int howto) 515 { 516 517 printf("Rebooting...\n"); 518 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 519 520 /* 521 * Acquiring smp_ipi_mtx here has a double effect: 522 * - it disables interrupts avoiding CPU0 preemption 523 * by fast handlers (thus deadlocking against other CPUs) 524 * - it avoids deadlocks against smp_rendezvous() or, more 525 * generally, threads busy-waiting, with this spinlock held, 526 * and waiting for responses by threads on other CPUs 527 * (ie. smp_tlb_shootdown()). 528 * 529 * For the !SMP case it just needs to handle the former problem. 530 */ 531 #ifdef SMP 532 mtx_lock_spin(&smp_ipi_mtx); 533 #else 534 spinlock_enter(); 535 #endif 536 537 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 538 cpu_reset(); 539 /* NOTREACHED */ /* assuming reset worked */ 540 } 541 542 #if defined(WITNESS) || defined(INVARIANTS) 543 static int kassert_warn_only = 0; 544 #ifdef KDB 545 static int kassert_do_kdb = 0; 546 #endif 547 #ifdef KTR 548 static int kassert_do_ktr = 0; 549 #endif 550 static int kassert_do_log = 1; 551 static int kassert_log_pps_limit = 4; 552 static int kassert_log_mute_at = 0; 553 static int kassert_log_panic_at = 0; 554 static int kassert_warnings = 0; 555 556 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options"); 557 558 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RWTUN, 559 &kassert_warn_only, 0, 560 "KASSERT triggers a panic (1) or just a warning (0)"); 561 562 #ifdef KDB 563 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RWTUN, 564 &kassert_do_kdb, 0, "KASSERT will enter the debugger"); 565 #endif 566 567 #ifdef KTR 568 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RWTUN, 569 &kassert_do_ktr, 0, 570 "KASSERT does a KTR, set this to the KTRMASK you want"); 571 #endif 572 573 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RWTUN, 574 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)"); 575 576 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RWTUN, 577 &kassert_warnings, 0, "number of KASSERTs that have been triggered"); 578 579 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RWTUN, 580 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic"); 581 582 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RWTUN, 583 &kassert_log_pps_limit, 0, "limit number of log messages per second"); 584 585 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RWTUN, 586 &kassert_log_mute_at, 0, "max number of KASSERTS to log"); 587 588 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS); 589 590 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert, 591 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0, 592 kassert_sysctl_kassert, "I", "set to trigger a test kassert"); 593 594 static int 595 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS) 596 { 597 int error, i; 598 599 error = sysctl_wire_old_buffer(req, sizeof(int)); 600 if (error == 0) { 601 i = 0; 602 error = sysctl_handle_int(oidp, &i, 0, req); 603 } 604 if (error != 0 || req->newptr == NULL) 605 return (error); 606 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i)); 607 return (0); 608 } 609 610 /* 611 * Called by KASSERT, this decides if we will panic 612 * or if we will log via printf and/or ktr. 613 */ 614 void 615 kassert_panic(const char *fmt, ...) 616 { 617 static char buf[256]; 618 va_list ap; 619 620 va_start(ap, fmt); 621 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 622 va_end(ap); 623 624 /* 625 * panic if we're not just warning, or if we've exceeded 626 * kassert_log_panic_at warnings. 627 */ 628 if (!kassert_warn_only || 629 (kassert_log_panic_at > 0 && 630 kassert_warnings >= kassert_log_panic_at)) { 631 va_start(ap, fmt); 632 vpanic(fmt, ap); 633 /* NORETURN */ 634 } 635 #ifdef KTR 636 if (kassert_do_ktr) 637 CTR0(ktr_mask, buf); 638 #endif /* KTR */ 639 /* 640 * log if we've not yet met the mute limit. 641 */ 642 if (kassert_do_log && 643 (kassert_log_mute_at == 0 || 644 kassert_warnings < kassert_log_mute_at)) { 645 static struct timeval lasterr; 646 static int curerr; 647 648 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) { 649 printf("KASSERT failed: %s\n", buf); 650 kdb_backtrace(); 651 } 652 } 653 #ifdef KDB 654 if (kassert_do_kdb) { 655 kdb_enter(KDB_WHY_KASSERT, buf); 656 } 657 #endif 658 atomic_add_int(&kassert_warnings, 1); 659 } 660 #endif 661 662 /* 663 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 664 * and then reboots. If we are called twice, then we avoid trying to sync 665 * the disks as this often leads to recursive panics. 666 */ 667 void 668 panic(const char *fmt, ...) 669 { 670 va_list ap; 671 672 va_start(ap, fmt); 673 vpanic(fmt, ap); 674 } 675 676 static void 677 vpanic(const char *fmt, va_list ap) 678 { 679 #ifdef SMP 680 cpuset_t other_cpus; 681 #endif 682 struct thread *td = curthread; 683 int bootopt, newpanic; 684 static char buf[256]; 685 686 spinlock_enter(); 687 688 #ifdef SMP 689 /* 690 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from 691 * concurrently entering panic. Only the winner will proceed 692 * further. 693 */ 694 if (panicstr == NULL && !kdb_active) { 695 other_cpus = all_cpus; 696 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 697 stop_cpus_hard(other_cpus); 698 } 699 700 /* 701 * We set stop_scheduler here and not in the block above, 702 * because we want to ensure that if panic has been called and 703 * stop_scheduler_on_panic is true, then stop_scheduler will 704 * always be set. Even if panic has been entered from kdb. 705 */ 706 td->td_stopsched = 1; 707 #endif 708 709 bootopt = RB_AUTOBOOT; 710 newpanic = 0; 711 if (panicstr) 712 bootopt |= RB_NOSYNC; 713 else { 714 bootopt |= RB_DUMP; 715 panicstr = fmt; 716 newpanic = 1; 717 } 718 719 if (newpanic) { 720 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 721 panicstr = buf; 722 cngrab(); 723 printf("panic: %s\n", buf); 724 } else { 725 printf("panic: "); 726 vprintf(fmt, ap); 727 printf("\n"); 728 } 729 #ifdef SMP 730 printf("cpuid = %d\n", PCPU_GET(cpuid)); 731 #endif 732 733 #ifdef KDB 734 if (newpanic && trace_on_panic) 735 kdb_backtrace(); 736 if (debugger_on_panic) 737 kdb_enter(KDB_WHY_PANIC, "panic"); 738 #endif 739 /*thread_lock(td); */ 740 td->td_flags |= TDF_INPANIC; 741 /* thread_unlock(td); */ 742 if (!sync_on_panic) 743 bootopt |= RB_NOSYNC; 744 kern_reboot(bootopt); 745 } 746 747 /* 748 * Support for poweroff delay. 749 * 750 * Please note that setting this delay too short might power off your machine 751 * before the write cache on your hard disk has been flushed, leading to 752 * soft-updates inconsistencies. 753 */ 754 #ifndef POWEROFF_DELAY 755 # define POWEROFF_DELAY 5000 756 #endif 757 static int poweroff_delay = POWEROFF_DELAY; 758 759 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 760 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 761 762 static void 763 poweroff_wait(void *junk, int howto) 764 { 765 766 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 767 return; 768 DELAY(poweroff_delay * 1000); 769 } 770 771 /* 772 * Some system processes (e.g. syncer) need to be stopped at appropriate 773 * points in their main loops prior to a system shutdown, so that they 774 * won't interfere with the shutdown process (e.g. by holding a disk buf 775 * to cause sync to fail). For each of these system processes, register 776 * shutdown_kproc() as a handler for one of shutdown events. 777 */ 778 static int kproc_shutdown_wait = 60; 779 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 780 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 781 782 void 783 kproc_shutdown(void *arg, int howto) 784 { 785 struct proc *p; 786 int error; 787 788 if (panicstr) 789 return; 790 791 p = (struct proc *)arg; 792 printf("Waiting (max %d seconds) for system process `%s' to stop...", 793 kproc_shutdown_wait, p->p_comm); 794 error = kproc_suspend(p, kproc_shutdown_wait * hz); 795 796 if (error == EWOULDBLOCK) 797 printf("timed out\n"); 798 else 799 printf("done\n"); 800 } 801 802 void 803 kthread_shutdown(void *arg, int howto) 804 { 805 struct thread *td; 806 int error; 807 808 if (panicstr) 809 return; 810 811 td = (struct thread *)arg; 812 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 813 kproc_shutdown_wait, td->td_name); 814 error = kthread_suspend(td, kproc_shutdown_wait * hz); 815 816 if (error == EWOULDBLOCK) 817 printf("timed out\n"); 818 else 819 printf("done\n"); 820 } 821 822 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)]; 823 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD, 824 dumpdevname, 0, "Device for kernel dumps"); 825 826 /* Registration of dumpers */ 827 int 828 set_dumper(struct dumperinfo *di, const char *devname) 829 { 830 size_t wantcopy; 831 832 if (di == NULL) { 833 bzero(&dumper, sizeof dumper); 834 dumpdevname[0] = '\0'; 835 return (0); 836 } 837 if (dumper.dumper != NULL) 838 return (EBUSY); 839 dumper = *di; 840 wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname)); 841 if (wantcopy >= sizeof(dumpdevname)) { 842 printf("set_dumper: device name truncated from '%s' -> '%s'\n", 843 devname, dumpdevname); 844 } 845 return (0); 846 } 847 848 /* Call dumper with bounds checking. */ 849 int 850 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 851 off_t offset, size_t length) 852 { 853 854 if (length != 0 && (offset < di->mediaoffset || 855 offset - di->mediaoffset + length > di->mediasize)) { 856 printf("Attempt to write outside dump device boundaries.\n" 857 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n", 858 (intmax_t)offset, (intmax_t)di->mediaoffset, 859 (uintmax_t)length, (intmax_t)di->mediasize); 860 return (ENOSPC); 861 } 862 return (di->dumper(di->priv, virtual, physical, offset, length)); 863 } 864 865 void 866 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 867 uint64_t dumplen, uint32_t blksz) 868 { 869 870 bzero(kdh, sizeof(*kdh)); 871 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 872 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 873 kdh->version = htod32(KERNELDUMPVERSION); 874 kdh->architectureversion = htod32(archver); 875 kdh->dumplength = htod64(dumplen); 876 kdh->dumptime = htod64(time_second); 877 kdh->blocksize = htod32(blksz); 878 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 879 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 880 if (panicstr != NULL) 881 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 882 kdh->parity = kerneldump_parity(kdh); 883 } 884