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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 39 * $FreeBSD: src/sys/kern/kern_shutdown.c,v 1.72.2.12 2002/02/21 19:15:10 dillon Exp $ 40 * $DragonFly: src/sys/kern/kern_shutdown.c,v 1.41 2006/11/07 17:51:23 dillon Exp $ 41 */ 42 43 #include "opt_ddb.h" 44 #include "opt_ddb_trace.h" 45 #include "opt_hw_wdog.h" 46 #include "opt_panic.h" 47 #include "opt_show_busybufs.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/eventhandler.h> 52 #include <sys/buf.h> 53 #include <sys/disklabel.h> 54 #include <sys/reboot.h> 55 #include <sys/proc.h> 56 #include <sys/vnode.h> 57 #include <sys/kernel.h> 58 #include <sys/kthread.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/queue.h> 62 #include <sys/sysctl.h> 63 #include <sys/vkernel.h> 64 #include <sys/conf.h> 65 #include <sys/sysproto.h> 66 #include <sys/device.h> 67 #include <sys/cons.h> 68 #include <sys/shm.h> 69 #include <sys/kern_syscall.h> 70 #include <vm/vm_map.h> 71 #include <vm/pmap.h> 72 73 #include <sys/thread2.h> 74 #include <sys/buf2.h> 75 76 #include <machine/pcb.h> 77 #include <machine/clock.h> 78 #include <machine/md_var.h> 79 #include <machine/smp.h> /* smp_active_mask, cpuid */ 80 81 #include <sys/signalvar.h> 82 83 #ifndef PANIC_REBOOT_WAIT_TIME 84 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 85 #endif 86 87 /* 88 * Note that stdarg.h and the ANSI style va_start macro is used for both 89 * ANSI and traditional C compilers. We use the machine version to stay 90 * within the confines of the kernel header files. 91 */ 92 #include <machine/stdarg.h> 93 94 #ifdef DDB 95 #ifdef DDB_UNATTENDED 96 int debugger_on_panic = 0; 97 #else 98 int debugger_on_panic = 1; 99 #endif 100 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, 101 &debugger_on_panic, 0, "Run debugger on kernel panic"); 102 103 extern void db_print_backtrace(void); 104 105 #ifdef DDB_TRACE 106 int trace_on_panic = 1; 107 #else 108 int trace_on_panic = 0; 109 #endif 110 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW, 111 &trace_on_panic, 0, "Print stack trace on kernel panic"); 112 #endif 113 114 static int sync_on_panic = 1; 115 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW, 116 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 117 118 SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 119 120 #ifdef HW_WDOG 121 /* 122 * If there is a hardware watchdog, point this at the function needed to 123 * hold it off. 124 * It's needed when the kernel needs to do some lengthy operations. 125 * e.g. in wd.c when dumping core.. It's most annoying to have 126 * your precious core-dump only half written because the wdog kicked in. 127 */ 128 watchdog_tickle_fn wdog_tickler = NULL; 129 #endif /* HW_WDOG */ 130 131 /* 132 * Variable panicstr contains argument to first call to panic; used as flag 133 * to indicate that the kernel has already called panic. 134 */ 135 const char *panicstr; 136 137 int dumping; /* system is dumping */ 138 #ifdef SMP 139 u_int panic_cpu_interlock; /* panic interlock */ 140 globaldata_t panic_cpu_gd; /* which cpu took the panic */ 141 #endif 142 143 static void boot (int) __dead2; 144 static void dumpsys (void); 145 static int setdumpdev (cdev_t dev); 146 static void poweroff_wait (void *, int); 147 static void print_uptime (void); 148 static void shutdown_halt (void *junk, int howto); 149 static void shutdown_panic (void *junk, int howto); 150 static void shutdown_reset (void *junk, int howto); 151 static int shutdown_busycount1(struct buf *bp, void *info); 152 static int shutdown_busycount2(struct buf *bp, void *info); 153 static void shutdown_cleanup_proc(struct proc *p); 154 155 /* register various local shutdown events */ 156 static void 157 shutdown_conf(void *unused) 158 { 159 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST); 160 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100); 161 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100); 162 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200); 163 } 164 165 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL) 166 167 /* ARGSUSED */ 168 169 /* 170 * The system call that results in a reboot 171 */ 172 int 173 sys_reboot(struct reboot_args *uap) 174 { 175 struct thread *td = curthread; 176 int error; 177 178 if ((error = suser(td))) 179 return (error); 180 181 boot(uap->opt); 182 return (0); 183 } 184 185 /* 186 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 187 */ 188 static int shutdown_howto = 0; 189 190 void 191 shutdown_nice(int howto) 192 { 193 shutdown_howto = howto; 194 195 /* Send a signal to init(8) and have it shutdown the world */ 196 if (initproc != NULL) { 197 ksignal(initproc, SIGINT); 198 } else { 199 /* No init(8) running, so simply reboot */ 200 boot(RB_NOSYNC); 201 } 202 return; 203 } 204 static int waittime = -1; 205 static struct thread *dumpthread; 206 static struct pcb dumppcb; 207 208 static void 209 print_uptime() 210 { 211 int f; 212 struct timespec ts; 213 214 getnanouptime(&ts); 215 printf("Uptime: "); 216 f = 0; 217 if (ts.tv_sec >= 86400) { 218 printf("%ldd", ts.tv_sec / 86400); 219 ts.tv_sec %= 86400; 220 f = 1; 221 } 222 if (f || ts.tv_sec >= 3600) { 223 printf("%ldh", ts.tv_sec / 3600); 224 ts.tv_sec %= 3600; 225 f = 1; 226 } 227 if (f || ts.tv_sec >= 60) { 228 printf("%ldm", ts.tv_sec / 60); 229 ts.tv_sec %= 60; 230 f = 1; 231 } 232 printf("%lds\n", ts.tv_sec); 233 } 234 235 /* 236 * Go through the rigmarole of shutting down.. 237 * this used to be in machdep.c but I'll be dammned if I could see 238 * anything machine dependant in it. 239 */ 240 static void 241 boot(int howto) 242 { 243 /* 244 * Get rid of any user scheduler baggage and then give 245 * us a high priority. 246 */ 247 if (curthread->td_release) 248 curthread->td_release(curthread); 249 lwkt_setpri_self(TDPRI_MAX); 250 251 /* collect extra flags that shutdown_nice might have set */ 252 howto |= shutdown_howto; 253 254 #ifdef SMP 255 /* 256 * We really want to shutdown on the BSP. Subsystems such as ACPI 257 * can't power-down the box otherwise. 258 */ 259 if (smp_active_mask > 1) { 260 printf("boot() called on cpu#%d\n", mycpu->gd_cpuid); 261 } 262 if (panicstr == NULL && mycpu->gd_cpuid != 0) { 263 printf("Switching to cpu #0 for shutdown\n"); 264 lwkt_setcpu_self(globaldata_find(0)); 265 } 266 #endif 267 /* 268 * Do any callouts that should be done BEFORE syncing the filesystems. 269 */ 270 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 271 272 /* 273 * Try to get rid of any remaining FS references. The calling 274 * process, proc0, and init may still hold references. The 275 * VFS cache subsystem may still hold a root reference to root. 276 */ 277 if (panicstr == NULL) { 278 shutdown_cleanup_proc(curproc); 279 shutdown_cleanup_proc(&proc0); 280 if (initproc) 281 shutdown_cleanup_proc(initproc); 282 vfs_cache_setroot(NULL, NULL); 283 } 284 285 /* 286 * Now sync filesystems 287 */ 288 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 289 int iter, nbusy, pbusy; 290 291 waittime = 0; 292 printf("\nsyncing disks... "); 293 294 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 295 296 /* 297 * With soft updates, some buffers that are 298 * written will be remarked as dirty until other 299 * buffers are written. 300 */ 301 for (iter = pbusy = 0; iter < 20; iter++) { 302 nbusy = scan_all_buffers(shutdown_busycount1, NULL); 303 if (nbusy == 0) 304 break; 305 printf("%d ", nbusy); 306 if (nbusy < pbusy) 307 iter = 0; 308 pbusy = nbusy; 309 /* 310 * XXX: 311 * Process soft update work queue if buffers don't sync 312 * after 6 iterations by permitting the syncer to run. 313 */ 314 if (iter > 5 && bioops.io_sync) 315 (*bioops.io_sync)(NULL); 316 sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */ 317 tsleep(boot, 0, "shutdn", hz * iter / 20 + 1); 318 } 319 printf("\n"); 320 /* 321 * Count only busy local buffers to prevent forcing 322 * a fsck if we're just a client of a wedged NFS server 323 */ 324 nbusy = scan_all_buffers(shutdown_busycount2, NULL); 325 if (nbusy) { 326 /* 327 * Failed to sync all blocks. Indicate this and don't 328 * unmount filesystems (thus forcing an fsck on reboot). 329 */ 330 printf("giving up on %d buffers\n", nbusy); 331 #ifdef DDB 332 Debugger("busy buffer problem"); 333 #endif /* DDB */ 334 tsleep(boot, 0, "shutdn", hz * 5 + 1); 335 } else { 336 printf("done\n"); 337 /* 338 * Unmount filesystems 339 */ 340 if (panicstr == NULL) 341 vfs_unmountall(); 342 } 343 tsleep(boot, 0, "shutdn", hz / 10 + 1); 344 } 345 346 print_uptime(); 347 348 /* 349 * Ok, now do things that assume all filesystem activity has 350 * been completed. 351 */ 352 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 353 crit_enter(); 354 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) 355 dumpsys(); 356 357 /* Now that we're going to really halt the system... */ 358 EVENTHANDLER_INVOKE(shutdown_final, howto); 359 360 for(;;) ; /* safety against shutdown_reset not working */ 361 /* NOTREACHED */ 362 } 363 364 static int 365 shutdown_busycount1(struct buf *bp, void *info) 366 { 367 if ((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp) > 0) 368 return(1); 369 if ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) 370 return (1); 371 return (0); 372 } 373 374 static int 375 shutdown_busycount2(struct buf *bp, void *info) 376 { 377 if (((bp->b_flags & B_INVAL) == 0 && BUF_REFCNT(bp)) || 378 ((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) { 379 /* 380 * Only count buffers undergoing write I/O 381 * on the related vnode. 382 */ 383 if (bp->b_vp == NULL || 384 bp->b_vp->v_track_write.bk_active == 0) { 385 return (0); 386 } 387 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 388 printf( 389 "%p dev:?, flags:%08x, loffset:%lld, doffset:%lld\n", 390 bp, 391 bp->b_flags, bp->b_loffset, 392 bp->b_bio2.bio_offset); 393 #endif 394 return(1); 395 } 396 return(0); 397 } 398 399 /* 400 * If the shutdown was a clean halt, behave accordingly. 401 */ 402 static void 403 shutdown_halt(void *junk, int howto) 404 { 405 if (howto & RB_HALT) { 406 printf("\n"); 407 printf("The operating system has halted.\n"); 408 printf("Please press any key to reboot.\n\n"); 409 switch (cngetc()) { 410 case -1: /* No console, just die */ 411 cpu_halt(); 412 /* NOTREACHED */ 413 default: 414 howto &= ~RB_HALT; 415 break; 416 } 417 } 418 } 419 420 /* 421 * Check to see if the system paniced, pause and then reboot 422 * according to the specified delay. 423 */ 424 static void 425 shutdown_panic(void *junk, int howto) 426 { 427 int loop; 428 429 if (howto & RB_DUMP) { 430 if (PANIC_REBOOT_WAIT_TIME != 0) { 431 if (PANIC_REBOOT_WAIT_TIME != -1) { 432 printf("Automatic reboot in %d seconds - " 433 "press a key on the console to abort\n", 434 PANIC_REBOOT_WAIT_TIME); 435 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 436 loop > 0; --loop) { 437 DELAY(1000 * 100); /* 1/10th second */ 438 /* Did user type a key? */ 439 if (cncheckc() != -1) 440 break; 441 } 442 if (!loop) 443 return; 444 } 445 } else { /* zero time specified - reboot NOW */ 446 return; 447 } 448 printf("--> Press a key on the console to reboot,\n"); 449 printf("--> or switch off the system now.\n"); 450 cngetc(); 451 } 452 } 453 454 /* 455 * Everything done, now reset 456 */ 457 static void 458 shutdown_reset(void *junk, int howto) 459 { 460 printf("Rebooting...\n"); 461 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 462 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 463 cpu_reset(); 464 /* NOTREACHED */ /* assuming reset worked */ 465 } 466 467 /* 468 * Try to remove FS references in the specified process. This function 469 * is used during shutdown 470 */ 471 static 472 void 473 shutdown_cleanup_proc(struct proc *p) 474 { 475 struct filedesc *fdp; 476 struct vmspace *vm; 477 478 if (p == NULL) 479 return; 480 if ((fdp = p->p_fd) != NULL) { 481 kern_closefrom(0); 482 if (fdp->fd_cdir) { 483 cache_drop(&fdp->fd_ncdir); 484 vrele(fdp->fd_cdir); 485 fdp->fd_cdir = NULL; 486 } 487 if (fdp->fd_rdir) { 488 cache_drop(&fdp->fd_nrdir); 489 vrele(fdp->fd_rdir); 490 fdp->fd_rdir = NULL; 491 } 492 if (fdp->fd_jdir) { 493 cache_drop(&fdp->fd_njdir); 494 vrele(fdp->fd_jdir); 495 fdp->fd_jdir = NULL; 496 } 497 } 498 if (p->p_vkernel) 499 vkernel_exit(p); 500 if (p->p_textvp) { 501 vrele(p->p_textvp); 502 p->p_textvp = NULL; 503 } 504 vm = p->p_vmspace; 505 if (vm != NULL) { 506 pmap_remove_pages(vmspace_pmap(vm), 507 VM_MIN_USER_ADDRESS, 508 VM_MAX_USER_ADDRESS); 509 vm_map_remove(&vm->vm_map, 510 VM_MIN_USER_ADDRESS, 511 VM_MAX_USER_ADDRESS); 512 } 513 } 514 515 /* 516 * Magic number for savecore 517 * 518 * exported (symorder) and used at least by savecore(8) 519 * 520 */ 521 static u_long const dumpmag = 0x8fca0101UL; 522 523 static int dumpsize = 0; /* also for savecore */ 524 525 static int dodump = 1; 526 527 SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, 528 "Try to perform coredump on kernel panic"); 529 530 static int 531 setdumpdev(dev) 532 cdev_t dev; 533 { 534 int psize; 535 long newdumplo; 536 537 if (dev == NOCDEV) { 538 dumpdev = dev; 539 return (0); 540 } 541 psize = dev_dpsize(dev); 542 if (psize == -1) 543 return (ENXIO); 544 /* 545 * XXX should clean up checking in dumpsys() to be more like this. 546 */ 547 newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE); 548 if (newdumplo <= LABELSECTOR) 549 return (ENOSPC); 550 dumpdev = dev; 551 dumplo = newdumplo; 552 return (0); 553 } 554 555 556 /* ARGSUSED */ 557 static void dump_conf (void *dummy); 558 static void 559 dump_conf(dummy) 560 void *dummy; 561 { 562 char *path; 563 cdev_t dev; 564 565 path = kmalloc(MNAMELEN, M_TEMP, M_WAITOK); 566 if (TUNABLE_STR_FETCH("dumpdev", path, MNAMELEN) != 0) { 567 dev = kgetdiskbyname(path); 568 if (dev != NOCDEV) 569 dumpdev = dev; 570 } 571 kfree(path, M_TEMP); 572 if (setdumpdev(dumpdev) != 0) 573 dumpdev = NOCDEV; 574 } 575 576 SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL) 577 578 static int 579 sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS) 580 { 581 int error; 582 udev_t ndumpdev; 583 584 ndumpdev = dev2udev(dumpdev); 585 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req); 586 if (error == 0 && req->newptr != NULL) 587 error = setdumpdev(udev2dev(ndumpdev, 0)); 588 return (error); 589 } 590 591 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW, 592 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,udev_t", ""); 593 594 /* 595 * Doadump comes here after turning off memory management and 596 * getting on the dump stack, either when called above, or by 597 * the auto-restart code. 598 */ 599 static void 600 dumpsys(void) 601 { 602 int error; 603 604 savectx(&dumppcb); 605 dumpthread = curthread; 606 if (dumping++) { 607 printf("Dump already in progress, bailing...\n"); 608 return; 609 } 610 if (!dodump) 611 return; 612 if (dumpdev == NOCDEV) 613 return; 614 dumpsize = Maxmem; 615 printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo); 616 printf("dump "); 617 error = dev_ddump(dumpdev); 618 if (error == 0) { 619 printf("succeeded\n"); 620 return; 621 } 622 printf("failed, reason: "); 623 switch (error) { 624 case ENOSYS: 625 case ENODEV: 626 printf("device doesn't support a dump routine\n"); 627 break; 628 629 case ENXIO: 630 printf("device bad\n"); 631 break; 632 633 case EFAULT: 634 printf("device not ready\n"); 635 break; 636 637 case EINVAL: 638 printf("area improper\n"); 639 break; 640 641 case EIO: 642 printf("i/o error\n"); 643 break; 644 645 case EINTR: 646 printf("aborted from console\n"); 647 break; 648 649 default: 650 printf("unknown, error = %d\n", error); 651 break; 652 } 653 } 654 655 int 656 dumpstatus(vm_offset_t addr, off_t count) 657 { 658 int c; 659 660 if (addr % (1024 * 1024) == 0) { 661 #ifdef HW_WDOG 662 if (wdog_tickler) 663 (*wdog_tickler)(); 664 #endif 665 printf("%ld ", (long)(count / (1024 * 1024))); 666 } 667 668 if ((c = cncheckc()) == 0x03) 669 return -1; 670 else if (c != -1) 671 printf("[CTRL-C to abort] "); 672 673 return 0; 674 } 675 676 /* 677 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 678 * and then reboots. If we are called twice, then we avoid trying to sync 679 * the disks as this often leads to recursive panics. 680 */ 681 void 682 panic(const char *fmt, ...) 683 { 684 int bootopt, newpanic; 685 __va_list ap; 686 static char buf[256]; 687 688 #ifdef SMP 689 /* 690 * If a panic occurs on multiple cpus before the first is able to 691 * halt the other cpus, only one cpu is allowed to take the panic. 692 * Attempt to be verbose about this situation but if the printf() 693 * itself panics don't let us overrun the kernel stack. 694 * 695 * Be very nasty about descheduling our thread at the lowest 696 * level possible in an attempt to freeze the thread without 697 * inducing further panics. 698 * 699 * Bumping gd_trap_nesting_level will also bypass assertions in 700 * lwkt_switch() and allow us to switch away even if we are a 701 * FAST interrupt or IPI. 702 */ 703 if (atomic_poll_acquire_int(&panic_cpu_interlock)) { 704 panic_cpu_gd = mycpu; 705 } else if (panic_cpu_gd != mycpu) { 706 crit_enter(); 707 ++mycpu->gd_trap_nesting_level; 708 if (mycpu->gd_trap_nesting_level < 25) { 709 printf("SECONDARY PANIC ON CPU %d THREAD %p\n", 710 mycpu->gd_cpuid, curthread); 711 } 712 curthread->td_release = NULL; /* be a grinch */ 713 for (;;) { 714 lwkt_deschedule_self(curthread); 715 lwkt_switch(); 716 } 717 /* NOT REACHED */ 718 /* --mycpu->gd_trap_nesting_level */ 719 /* crit_exit() */ 720 } 721 #endif 722 bootopt = RB_AUTOBOOT | RB_DUMP; 723 if (sync_on_panic == 0) 724 bootopt |= RB_NOSYNC; 725 newpanic = 0; 726 if (panicstr) 727 bootopt |= RB_NOSYNC; 728 else { 729 panicstr = fmt; 730 newpanic = 1; 731 } 732 733 __va_start(ap, fmt); 734 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 735 if (panicstr == fmt) 736 panicstr = buf; 737 __va_end(ap); 738 printf("panic: %s\n", buf); 739 #ifdef SMP 740 /* three separate prints in case of an unmapped page and trap */ 741 printf("mp_lock = %08x; ", mp_lock); 742 printf("cpuid = %d; ", mycpu->gd_cpuid); 743 printf("lapic.id = %08x\n", lapic.id); 744 #endif 745 746 #if defined(DDB) 747 if (newpanic && trace_on_panic) 748 db_print_backtrace(); 749 if (debugger_on_panic) 750 Debugger ("panic"); 751 #endif 752 boot(bootopt); 753 } 754 755 /* 756 * Support for poweroff delay. 757 */ 758 #ifndef POWEROFF_DELAY 759 # define POWEROFF_DELAY 5000 760 #endif 761 static int poweroff_delay = POWEROFF_DELAY; 762 763 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 764 &poweroff_delay, 0, ""); 765 766 static void 767 poweroff_wait(void *junk, int howto) 768 { 769 if(!(howto & RB_POWEROFF) || poweroff_delay <= 0) 770 return; 771 DELAY(poweroff_delay * 1000); 772 } 773 774 /* 775 * Some system processes (e.g. syncer) need to be stopped at appropriate 776 * points in their main loops prior to a system shutdown, so that they 777 * won't interfere with the shutdown process (e.g. by holding a disk buf 778 * to cause sync to fail). For each of these system processes, register 779 * shutdown_kproc() as a handler for one of shutdown events. 780 */ 781 static int kproc_shutdown_wait = 60; 782 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 783 &kproc_shutdown_wait, 0, ""); 784 785 void 786 shutdown_kproc(void *arg, int howto) 787 { 788 struct thread *td; 789 struct proc *p; 790 int error; 791 792 if (panicstr) 793 return; 794 795 td = (struct thread *)arg; 796 if ((p = td->td_proc) != NULL) { 797 printf("Waiting (max %d seconds) for system process `%s' to stop...", 798 kproc_shutdown_wait, p->p_comm); 799 } else { 800 printf("Waiting (max %d seconds) for system thread %s to stop...", 801 kproc_shutdown_wait, td->td_comm); 802 } 803 error = suspend_kproc(td, kproc_shutdown_wait * hz); 804 805 if (error == EWOULDBLOCK) 806 printf("timed out\n"); 807 else 808 printf("stopped\n"); 809 } 810