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 static MALLOC_DEFINE(M_DUMPER, "dumper", "dumper block buffer"); 92 93 #ifndef PANIC_REBOOT_WAIT_TIME 94 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 95 #endif 96 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME; 97 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN, 98 &panic_reboot_wait_time, 0, 99 "Seconds to wait before rebooting after a panic"); 100 101 /* 102 * Note that stdarg.h and the ANSI style va_start macro is used for both 103 * ANSI and traditional C compilers. 104 */ 105 #include <machine/stdarg.h> 106 107 #ifdef KDB 108 #ifdef KDB_UNATTENDED 109 int debugger_on_panic = 0; 110 #else 111 int debugger_on_panic = 1; 112 #endif 113 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, 114 CTLFLAG_RWTUN | CTLFLAG_SECURE, 115 &debugger_on_panic, 0, "Run debugger on kernel panic"); 116 117 #ifdef KDB_TRACE 118 static int trace_on_panic = 1; 119 #else 120 static int trace_on_panic = 0; 121 #endif 122 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, 123 CTLFLAG_RWTUN | CTLFLAG_SECURE, 124 &trace_on_panic, 0, "Print stack trace on kernel panic"); 125 #endif /* KDB */ 126 127 static int sync_on_panic = 0; 128 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN, 129 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 130 131 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, 132 "Shutdown environment"); 133 134 #ifndef DIAGNOSTIC 135 static int show_busybufs; 136 #else 137 static int show_busybufs = 1; 138 #endif 139 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW, 140 &show_busybufs, 0, ""); 141 142 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"); 145 146 /* 147 * Variable panicstr contains argument to first call to panic; used as flag 148 * to indicate that the kernel has already called panic. 149 */ 150 const char *panicstr; 151 152 int dumping; /* system is dumping */ 153 int rebooting; /* system is rebooting */ 154 static struct dumperinfo dumper; /* our selected dumper */ 155 156 /* Context information for dump-debuggers. */ 157 static struct pcb dumppcb; /* Registers. */ 158 lwpid_t dumptid; /* Thread ID. */ 159 160 static struct cdevsw reroot_cdevsw = { 161 .d_version = D_VERSION, 162 .d_name = "reroot", 163 }; 164 165 static void poweroff_wait(void *, int); 166 static void shutdown_halt(void *junk, int howto); 167 static void shutdown_panic(void *junk, int howto); 168 static void shutdown_reset(void *junk, int howto); 169 static int kern_reroot(void); 170 171 /* register various local shutdown events */ 172 static void 173 shutdown_conf(void *unused) 174 { 175 176 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 177 SHUTDOWN_PRI_FIRST); 178 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 179 SHUTDOWN_PRI_LAST + 100); 180 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 181 SHUTDOWN_PRI_LAST + 100); 182 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 183 SHUTDOWN_PRI_LAST + 200); 184 } 185 186 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 187 188 /* 189 * The only reason this exists is to create the /dev/reroot/ directory, 190 * used by reroot code in init(8) as a mountpoint for tmpfs. 191 */ 192 static void 193 reroot_conf(void *unused) 194 { 195 int error; 196 struct cdev *cdev; 197 198 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev, 199 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot"); 200 if (error != 0) { 201 printf("%s: failed to create device node, error %d", 202 __func__, error); 203 } 204 } 205 206 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL); 207 208 /* 209 * The system call that results in a reboot. 210 */ 211 /* ARGSUSED */ 212 int 213 sys_reboot(struct thread *td, struct reboot_args *uap) 214 { 215 int error; 216 217 error = 0; 218 #ifdef MAC 219 error = mac_system_check_reboot(td->td_ucred, uap->opt); 220 #endif 221 if (error == 0) 222 error = priv_check(td, PRIV_REBOOT); 223 if (error == 0) { 224 if (uap->opt & RB_REROOT) { 225 error = kern_reroot(); 226 } else { 227 mtx_lock(&Giant); 228 kern_reboot(uap->opt); 229 mtx_unlock(&Giant); 230 } 231 } 232 return (error); 233 } 234 235 /* 236 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 237 */ 238 void 239 shutdown_nice(int howto) 240 { 241 242 if (initproc != NULL) { 243 /* Send a signal to init(8) and have it shutdown the world. */ 244 PROC_LOCK(initproc); 245 if (howto & RB_POWEROFF) 246 kern_psignal(initproc, SIGUSR2); 247 else if (howto & RB_HALT) 248 kern_psignal(initproc, SIGUSR1); 249 else 250 kern_psignal(initproc, SIGINT); 251 PROC_UNLOCK(initproc); 252 } else { 253 /* No init(8) running, so simply reboot. */ 254 kern_reboot(howto | RB_NOSYNC); 255 } 256 } 257 258 static void 259 print_uptime(void) 260 { 261 int f; 262 struct timespec ts; 263 264 getnanouptime(&ts); 265 printf("Uptime: "); 266 f = 0; 267 if (ts.tv_sec >= 86400) { 268 printf("%ldd", (long)ts.tv_sec / 86400); 269 ts.tv_sec %= 86400; 270 f = 1; 271 } 272 if (f || ts.tv_sec >= 3600) { 273 printf("%ldh", (long)ts.tv_sec / 3600); 274 ts.tv_sec %= 3600; 275 f = 1; 276 } 277 if (f || ts.tv_sec >= 60) { 278 printf("%ldm", (long)ts.tv_sec / 60); 279 ts.tv_sec %= 60; 280 f = 1; 281 } 282 printf("%lds\n", (long)ts.tv_sec); 283 } 284 285 int 286 doadump(boolean_t textdump) 287 { 288 boolean_t coredump; 289 int error; 290 291 error = 0; 292 if (dumping) 293 return (EBUSY); 294 if (dumper.dumper == NULL) 295 return (ENXIO); 296 297 savectx(&dumppcb); 298 dumptid = curthread->td_tid; 299 dumping++; 300 301 coredump = TRUE; 302 #ifdef DDB 303 if (textdump && textdump_pending) { 304 coredump = FALSE; 305 textdump_dumpsys(&dumper); 306 } 307 #endif 308 if (coredump) 309 error = dumpsys(&dumper); 310 311 dumping--; 312 return (error); 313 } 314 315 /* 316 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 317 */ 318 void 319 kern_reboot(int howto) 320 { 321 static int once = 0; 322 323 #if defined(SMP) 324 /* 325 * Bind us to CPU 0 so that all shutdown code runs there. Some 326 * systems don't shutdown properly (i.e., ACPI power off) if we 327 * run on another processor. 328 */ 329 if (!SCHEDULER_STOPPED()) { 330 thread_lock(curthread); 331 sched_bind(curthread, 0); 332 thread_unlock(curthread); 333 KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0")); 334 } 335 #endif 336 /* We're in the process of rebooting. */ 337 rebooting = 1; 338 339 /* We are out of the debugger now. */ 340 kdb_active = 0; 341 342 /* 343 * Do any callouts that should be done BEFORE syncing the filesystems. 344 */ 345 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 346 347 /* 348 * Now sync filesystems 349 */ 350 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) { 351 once = 1; 352 bufshutdown(show_busybufs); 353 } 354 355 print_uptime(); 356 357 cngrab(); 358 359 /* 360 * Ok, now do things that assume all filesystem activity has 361 * been completed. 362 */ 363 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 364 365 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 366 doadump(TRUE); 367 368 /* Now that we're going to really halt the system... */ 369 EVENTHANDLER_INVOKE(shutdown_final, howto); 370 371 for(;;) ; /* safety against shutdown_reset not working */ 372 /* NOTREACHED */ 373 } 374 375 /* 376 * The system call that results in changing the rootfs. 377 */ 378 static int 379 kern_reroot(void) 380 { 381 struct vnode *oldrootvnode, *vp; 382 struct mount *mp, *devmp; 383 int error; 384 385 if (curproc != initproc) 386 return (EPERM); 387 388 /* 389 * Mark the filesystem containing currently-running executable 390 * (the temporary copy of init(8)) busy. 391 */ 392 vp = curproc->p_textvp; 393 error = vn_lock(vp, LK_SHARED); 394 if (error != 0) 395 return (error); 396 mp = vp->v_mount; 397 error = vfs_busy(mp, MBF_NOWAIT); 398 if (error != 0) { 399 vfs_ref(mp); 400 VOP_UNLOCK(vp, 0); 401 error = vfs_busy(mp, 0); 402 vn_lock(vp, LK_SHARED | LK_RETRY); 403 vfs_rel(mp); 404 if (error != 0) { 405 VOP_UNLOCK(vp, 0); 406 return (ENOENT); 407 } 408 if (vp->v_iflag & VI_DOOMED) { 409 VOP_UNLOCK(vp, 0); 410 vfs_unbusy(mp); 411 return (ENOENT); 412 } 413 } 414 VOP_UNLOCK(vp, 0); 415 416 /* 417 * Remove the filesystem containing currently-running executable 418 * from the mount list, to prevent it from being unmounted 419 * by vfs_unmountall(), and to avoid confusing vfs_mountroot(). 420 * 421 * Also preserve /dev - forcibly unmounting it could cause driver 422 * reinitialization. 423 */ 424 425 vfs_ref(rootdevmp); 426 devmp = rootdevmp; 427 rootdevmp = NULL; 428 429 mtx_lock(&mountlist_mtx); 430 TAILQ_REMOVE(&mountlist, mp, mnt_list); 431 TAILQ_REMOVE(&mountlist, devmp, mnt_list); 432 mtx_unlock(&mountlist_mtx); 433 434 oldrootvnode = rootvnode; 435 436 /* 437 * Unmount everything except for the two filesystems preserved above. 438 */ 439 vfs_unmountall(); 440 441 /* 442 * Add /dev back; vfs_mountroot() will move it into its new place. 443 */ 444 mtx_lock(&mountlist_mtx); 445 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list); 446 mtx_unlock(&mountlist_mtx); 447 rootdevmp = devmp; 448 vfs_rel(rootdevmp); 449 450 /* 451 * Mount the new rootfs. 452 */ 453 vfs_mountroot(); 454 455 /* 456 * Update all references to the old rootvnode. 457 */ 458 mountcheckdirs(oldrootvnode, rootvnode); 459 460 /* 461 * Add the temporary filesystem back and unbusy it. 462 */ 463 mtx_lock(&mountlist_mtx); 464 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 465 mtx_unlock(&mountlist_mtx); 466 vfs_unbusy(mp); 467 468 return (0); 469 } 470 471 /* 472 * If the shutdown was a clean halt, behave accordingly. 473 */ 474 static void 475 shutdown_halt(void *junk, int howto) 476 { 477 478 if (howto & RB_HALT) { 479 printf("\n"); 480 printf("The operating system has halted.\n"); 481 printf("Please press any key to reboot.\n\n"); 482 switch (cngetc()) { 483 case -1: /* No console, just die */ 484 cpu_halt(); 485 /* NOTREACHED */ 486 default: 487 howto &= ~RB_HALT; 488 break; 489 } 490 } 491 } 492 493 /* 494 * Check to see if the system paniced, pause and then reboot 495 * according to the specified delay. 496 */ 497 static void 498 shutdown_panic(void *junk, int howto) 499 { 500 int loop; 501 502 if (howto & RB_DUMP) { 503 if (panic_reboot_wait_time != 0) { 504 if (panic_reboot_wait_time != -1) { 505 printf("Automatic reboot in %d seconds - " 506 "press a key on the console to abort\n", 507 panic_reboot_wait_time); 508 for (loop = panic_reboot_wait_time * 10; 509 loop > 0; --loop) { 510 DELAY(1000 * 100); /* 1/10th second */ 511 /* Did user type a key? */ 512 if (cncheckc() != -1) 513 break; 514 } 515 if (!loop) 516 return; 517 } 518 } else { /* zero time specified - reboot NOW */ 519 return; 520 } 521 printf("--> Press a key on the console to reboot,\n"); 522 printf("--> or switch off the system now.\n"); 523 cngetc(); 524 } 525 } 526 527 /* 528 * Everything done, now reset 529 */ 530 static void 531 shutdown_reset(void *junk, int howto) 532 { 533 534 printf("Rebooting...\n"); 535 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 536 537 /* 538 * Acquiring smp_ipi_mtx here has a double effect: 539 * - it disables interrupts avoiding CPU0 preemption 540 * by fast handlers (thus deadlocking against other CPUs) 541 * - it avoids deadlocks against smp_rendezvous() or, more 542 * generally, threads busy-waiting, with this spinlock held, 543 * and waiting for responses by threads on other CPUs 544 * (ie. smp_tlb_shootdown()). 545 * 546 * For the !SMP case it just needs to handle the former problem. 547 */ 548 #ifdef SMP 549 mtx_lock_spin(&smp_ipi_mtx); 550 #else 551 spinlock_enter(); 552 #endif 553 554 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 555 cpu_reset(); 556 /* NOTREACHED */ /* assuming reset worked */ 557 } 558 559 #if defined(WITNESS) || defined(INVARIANT_SUPPORT) 560 static int kassert_warn_only = 0; 561 #ifdef KDB 562 static int kassert_do_kdb = 0; 563 #endif 564 #ifdef KTR 565 static int kassert_do_ktr = 0; 566 #endif 567 static int kassert_do_log = 1; 568 static int kassert_log_pps_limit = 4; 569 static int kassert_log_mute_at = 0; 570 static int kassert_log_panic_at = 0; 571 static int kassert_warnings = 0; 572 573 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options"); 574 575 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RWTUN, 576 &kassert_warn_only, 0, 577 "KASSERT triggers a panic (1) or just a warning (0)"); 578 579 #ifdef KDB 580 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RWTUN, 581 &kassert_do_kdb, 0, "KASSERT will enter the debugger"); 582 #endif 583 584 #ifdef KTR 585 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RWTUN, 586 &kassert_do_ktr, 0, 587 "KASSERT does a KTR, set this to the KTRMASK you want"); 588 #endif 589 590 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RWTUN, 591 &kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)"); 592 593 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RWTUN, 594 &kassert_warnings, 0, "number of KASSERTs that have been triggered"); 595 596 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RWTUN, 597 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic"); 598 599 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RWTUN, 600 &kassert_log_pps_limit, 0, "limit number of log messages per second"); 601 602 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RWTUN, 603 &kassert_log_mute_at, 0, "max number of KASSERTS to log"); 604 605 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS); 606 607 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert, 608 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0, 609 kassert_sysctl_kassert, "I", "set to trigger a test kassert"); 610 611 static int 612 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS) 613 { 614 int error, i; 615 616 error = sysctl_wire_old_buffer(req, sizeof(int)); 617 if (error == 0) { 618 i = 0; 619 error = sysctl_handle_int(oidp, &i, 0, req); 620 } 621 if (error != 0 || req->newptr == NULL) 622 return (error); 623 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i)); 624 return (0); 625 } 626 627 /* 628 * Called by KASSERT, this decides if we will panic 629 * or if we will log via printf and/or ktr. 630 */ 631 void 632 kassert_panic(const char *fmt, ...) 633 { 634 static char buf[256]; 635 va_list ap; 636 637 va_start(ap, fmt); 638 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 639 va_end(ap); 640 641 /* 642 * panic if we're not just warning, or if we've exceeded 643 * kassert_log_panic_at warnings. 644 */ 645 if (!kassert_warn_only || 646 (kassert_log_panic_at > 0 && 647 kassert_warnings >= kassert_log_panic_at)) { 648 va_start(ap, fmt); 649 vpanic(fmt, ap); 650 /* NORETURN */ 651 } 652 #ifdef KTR 653 if (kassert_do_ktr) 654 CTR0(ktr_mask, buf); 655 #endif /* KTR */ 656 /* 657 * log if we've not yet met the mute limit. 658 */ 659 if (kassert_do_log && 660 (kassert_log_mute_at == 0 || 661 kassert_warnings < kassert_log_mute_at)) { 662 static struct timeval lasterr; 663 static int curerr; 664 665 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) { 666 printf("KASSERT failed: %s\n", buf); 667 kdb_backtrace(); 668 } 669 } 670 #ifdef KDB 671 if (kassert_do_kdb) { 672 kdb_enter(KDB_WHY_KASSERT, buf); 673 } 674 #endif 675 atomic_add_int(&kassert_warnings, 1); 676 } 677 #endif 678 679 /* 680 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 681 * and then reboots. If we are called twice, then we avoid trying to sync 682 * the disks as this often leads to recursive panics. 683 */ 684 void 685 panic(const char *fmt, ...) 686 { 687 va_list ap; 688 689 va_start(ap, fmt); 690 vpanic(fmt, ap); 691 } 692 693 void 694 vpanic(const char *fmt, va_list ap) 695 { 696 #ifdef SMP 697 cpuset_t other_cpus; 698 #endif 699 struct thread *td = curthread; 700 int bootopt, newpanic; 701 static char buf[256]; 702 703 spinlock_enter(); 704 705 #ifdef SMP 706 /* 707 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from 708 * concurrently entering panic. Only the winner will proceed 709 * further. 710 */ 711 if (panicstr == NULL && !kdb_active) { 712 other_cpus = all_cpus; 713 CPU_CLR(PCPU_GET(cpuid), &other_cpus); 714 stop_cpus_hard(other_cpus); 715 } 716 717 /* 718 * Ensure that the scheduler is stopped while panicking, even if panic 719 * has been entered from kdb. 720 */ 721 td->td_stopsched = 1; 722 #endif 723 724 bootopt = RB_AUTOBOOT; 725 newpanic = 0; 726 if (panicstr) 727 bootopt |= RB_NOSYNC; 728 else { 729 bootopt |= RB_DUMP; 730 panicstr = fmt; 731 newpanic = 1; 732 } 733 734 if (newpanic) { 735 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 736 panicstr = buf; 737 cngrab(); 738 printf("panic: %s\n", buf); 739 } else { 740 printf("panic: "); 741 vprintf(fmt, ap); 742 printf("\n"); 743 } 744 #ifdef SMP 745 printf("cpuid = %d\n", PCPU_GET(cpuid)); 746 #endif 747 748 #ifdef KDB 749 if (newpanic && trace_on_panic) 750 kdb_backtrace(); 751 if (debugger_on_panic) 752 kdb_enter(KDB_WHY_PANIC, "panic"); 753 #endif 754 /*thread_lock(td); */ 755 td->td_flags |= TDF_INPANIC; 756 /* thread_unlock(td); */ 757 if (!sync_on_panic) 758 bootopt |= RB_NOSYNC; 759 kern_reboot(bootopt); 760 } 761 762 /* 763 * Support for poweroff delay. 764 * 765 * Please note that setting this delay too short might power off your machine 766 * before the write cache on your hard disk has been flushed, leading to 767 * soft-updates inconsistencies. 768 */ 769 #ifndef POWEROFF_DELAY 770 # define POWEROFF_DELAY 5000 771 #endif 772 static int poweroff_delay = POWEROFF_DELAY; 773 774 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 775 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)"); 776 777 static void 778 poweroff_wait(void *junk, int howto) 779 { 780 781 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 782 return; 783 DELAY(poweroff_delay * 1000); 784 } 785 786 /* 787 * Some system processes (e.g. syncer) need to be stopped at appropriate 788 * points in their main loops prior to a system shutdown, so that they 789 * won't interfere with the shutdown process (e.g. by holding a disk buf 790 * to cause sync to fail). For each of these system processes, register 791 * shutdown_kproc() as a handler for one of shutdown events. 792 */ 793 static int kproc_shutdown_wait = 60; 794 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 795 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process"); 796 797 void 798 kproc_shutdown(void *arg, int howto) 799 { 800 struct proc *p; 801 int error; 802 803 if (panicstr) 804 return; 805 806 p = (struct proc *)arg; 807 printf("Waiting (max %d seconds) for system process `%s' to stop... ", 808 kproc_shutdown_wait, p->p_comm); 809 error = kproc_suspend(p, kproc_shutdown_wait * hz); 810 811 if (error == EWOULDBLOCK) 812 printf("timed out\n"); 813 else 814 printf("done\n"); 815 } 816 817 void 818 kthread_shutdown(void *arg, int howto) 819 { 820 struct thread *td; 821 int error; 822 823 if (panicstr) 824 return; 825 826 td = (struct thread *)arg; 827 printf("Waiting (max %d seconds) for system thread `%s' to stop... ", 828 kproc_shutdown_wait, td->td_name); 829 error = kthread_suspend(td, kproc_shutdown_wait * hz); 830 831 if (error == EWOULDBLOCK) 832 printf("timed out\n"); 833 else 834 printf("done\n"); 835 } 836 837 static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)]; 838 SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD, 839 dumpdevname, 0, "Device for kernel dumps"); 840 841 /* Registration of dumpers */ 842 int 843 set_dumper(struct dumperinfo *di, const char *devname, struct thread *td) 844 { 845 size_t wantcopy; 846 int error; 847 848 error = priv_check(td, PRIV_SETDUMPER); 849 if (error != 0) 850 return (error); 851 852 if (di == NULL) { 853 if (dumper.blockbuf != NULL) 854 free(dumper.blockbuf, M_DUMPER); 855 bzero(&dumper, sizeof(dumper)); 856 dumpdevname[0] = '\0'; 857 return (0); 858 } 859 if (dumper.dumper != NULL) 860 return (EBUSY); 861 dumper = *di; 862 wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname)); 863 if (wantcopy >= sizeof(dumpdevname)) { 864 printf("set_dumper: device name truncated from '%s' -> '%s'\n", 865 devname, dumpdevname); 866 } 867 dumper.blockbuf = malloc(di->blocksize, M_DUMPER, M_WAITOK | M_ZERO); 868 return (0); 869 } 870 871 /* Call dumper with bounds checking. */ 872 int 873 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 874 off_t offset, size_t length) 875 { 876 877 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); 883 return (ENOSPC); 884 } 885 return (di->dumper(di->priv, virtual, physical, offset, length)); 886 } 887 888 /* Call dumper with bounds checking. */ 889 int 890 dump_write_pad(struct dumperinfo *di, void *virtual, vm_offset_t physical, 891 off_t offset, size_t length, size_t *size) 892 { 893 char *temp; 894 int ret; 895 896 if (length > di->blocksize) 897 return (ENOMEM); 898 899 *size = di->blocksize; 900 if (length == di->blocksize) 901 temp = virtual; 902 else { 903 temp = di->blockbuf; 904 memset(temp + length, 0, di->blocksize - length); 905 memcpy(temp, virtual, length); 906 } 907 ret = dump_write(di, temp, physical, offset, *size); 908 909 return (ret); 910 } 911 912 913 void 914 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 915 uint64_t dumplen, uint32_t blksz) 916 { 917 918 bzero(kdh, sizeof(*kdh)); 919 strlcpy(kdh->magic, magic, sizeof(kdh->magic)); 920 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 921 kdh->version = htod32(KERNELDUMPVERSION); 922 kdh->architectureversion = htod32(archver); 923 kdh->dumplength = htod64(dumplen); 924 kdh->dumptime = htod64(time_second); 925 kdh->blocksize = htod32(blksz); 926 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 927 strlcpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 928 if (panicstr != NULL) 929 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 930 kdh->parity = kerneldump_parity(kdh); 931 } 932 933 #ifdef DDB 934 DB_SHOW_COMMAND(panic, db_show_panic) 935 { 936 937 if (panicstr == NULL) 938 db_printf("panicstr not set\n"); 939 else 940 db_printf("panic: %s\n", panicstr); 941 } 942 #endif 943