kern_shutdown.c revision 222865
1234370Sjasone/*- 2234370Sjasone * Copyright (c) 1986, 1988, 1991, 1993 3234370Sjasone * The Regents of the University of California. All rights reserved. 4234370Sjasone * (c) UNIX System Laboratories, Inc. 5234370Sjasone * All or some portions of this file are derived from material licensed 6234370Sjasone * to the University of California by American Telephone and Telegraph 7234370Sjasone * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8234370Sjasone * the permission of UNIX System Laboratories, Inc. 9234370Sjasone * 10234370Sjasone * Redistribution and use in source and binary forms, with or without 11234370Sjasone * modification, are permitted provided that the following conditions 12234370Sjasone * are met: 13234370Sjasone * 1. Redistributions of source code must retain the above copyright 14234370Sjasone * notice, this list of conditions and the following disclaimer. 15234370Sjasone * 2. Redistributions in binary form must reproduce the above copyright 16234370Sjasone * notice, this list of conditions and the following disclaimer in the 17234370Sjasone * documentation and/or other materials provided with the distribution. 18234370Sjasone * 4. Neither the name of the University nor the names of its contributors 19234370Sjasone * may be used to endorse or promote products derived from this software 20234370Sjasone * without specific prior written permission. 21234370Sjasone * 22234370Sjasone * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23234370Sjasone * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24234370Sjasone * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25234370Sjasone * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26234370Sjasone * 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: head/sys/kern/kern_shutdown.c 222865 2011-06-08 19:28:59Z attilio $"); 39 40#include "opt_ddb.h" 41#include "opt_kdb.h" 42#include "opt_panic.h" 43#include "opt_show_busybufs.h" 44#include "opt_sched.h" 45#include "opt_watchdog.h" 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/bio.h> 50#include <sys/buf.h> 51#include <sys/conf.h> 52#include <sys/cons.h> 53#include <sys/eventhandler.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/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/sched.h> 66#include <sys/smp.h> 67#include <sys/sysctl.h> 68#include <sys/sysproto.h> 69#ifdef SW_WATCHDOG 70#include <sys/watchdog.h> 71#endif 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 93/* 94 * Note that stdarg.h and the ANSI style va_start macro is used for both 95 * ANSI and traditional C compilers. 96 */ 97#include <machine/stdarg.h> 98 99#ifdef KDB 100#ifdef KDB_UNATTENDED 101int debugger_on_panic = 0; 102#else 103int debugger_on_panic = 1; 104#endif 105SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 106 &debugger_on_panic, 0, "Run debugger on kernel panic"); 107TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); 108 109#ifdef KDB_TRACE 110static int trace_on_panic = 1; 111#else 112static int trace_on_panic = 0; 113#endif 114SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 115 &trace_on_panic, 0, "Print stack trace on kernel panic"); 116TUNABLE_INT("debug.trace_on_panic", &trace_on_panic); 117#endif /* KDB */ 118 119static int sync_on_panic = 0; 120SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 121 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 122TUNABLE_INT("kern.sync_on_panic", &sync_on_panic); 123 124SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment"); 125 126/* 127 * Variable panicstr contains argument to first call to panic; used as flag 128 * to indicate that the kernel has already called panic. 129 */ 130const char *panicstr; 131 132int dumping; /* system is dumping */ 133int rebooting; /* system is rebooting */ 134static struct dumperinfo dumper; /* our selected dumper */ 135 136/* Context information for dump-debuggers. */ 137static struct pcb dumppcb; /* Registers. */ 138static lwpid_t dumptid; /* Thread ID. */ 139 140static void poweroff_wait(void *, int); 141static void shutdown_halt(void *junk, int howto); 142static void shutdown_panic(void *junk, int howto); 143static void shutdown_reset(void *junk, int howto); 144 145/* register various local shutdown events */ 146static void 147shutdown_conf(void *unused) 148{ 149 150 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, 151 SHUTDOWN_PRI_FIRST); 152 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, 153 SHUTDOWN_PRI_LAST + 100); 154 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, 155 SHUTDOWN_PRI_LAST + 100); 156 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, 157 SHUTDOWN_PRI_LAST + 200); 158} 159 160SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL); 161 162/* 163 * The system call that results in a reboot. 164 */ 165/* ARGSUSED */ 166int 167reboot(struct thread *td, struct reboot_args *uap) 168{ 169 int error; 170 171 error = 0; 172#ifdef MAC 173 error = mac_system_check_reboot(td->td_ucred, uap->opt); 174#endif 175 if (error == 0) 176 error = priv_check(td, PRIV_REBOOT); 177 if (error == 0) { 178 mtx_lock(&Giant); 179 kern_reboot(uap->opt); 180 mtx_unlock(&Giant); 181 } 182 return (error); 183} 184 185/* 186 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC 187 */ 188static int shutdown_howto = 0; 189 190void 191shutdown_nice(int howto) 192{ 193 194 shutdown_howto = howto; 195 196 /* Send a signal to init(8) and have it shutdown the world */ 197 if (initproc != NULL) { 198 PROC_LOCK(initproc); 199 psignal(initproc, SIGINT); 200 PROC_UNLOCK(initproc); 201 } else { 202 /* No init(8) running, so simply reboot */ 203 kern_reboot(RB_NOSYNC); 204 } 205 return; 206} 207static int waittime = -1; 208 209static void 210print_uptime(void) 211{ 212 int f; 213 struct timespec ts; 214 215 getnanouptime(&ts); 216 printf("Uptime: "); 217 f = 0; 218 if (ts.tv_sec >= 86400) { 219 printf("%ldd", (long)ts.tv_sec / 86400); 220 ts.tv_sec %= 86400; 221 f = 1; 222 } 223 if (f || ts.tv_sec >= 3600) { 224 printf("%ldh", (long)ts.tv_sec / 3600); 225 ts.tv_sec %= 3600; 226 f = 1; 227 } 228 if (f || ts.tv_sec >= 60) { 229 printf("%ldm", (long)ts.tv_sec / 60); 230 ts.tv_sec %= 60; 231 f = 1; 232 } 233 printf("%lds\n", (long)ts.tv_sec); 234} 235 236int 237doadump(boolean_t textdump) 238{ 239 boolean_t coredump; 240 241 if (dumping) 242 return (EBUSY); 243 if (dumper.dumper == NULL) 244 return (ENXIO); 245 246 savectx(&dumppcb); 247 dumptid = curthread->td_tid; 248 dumping++; 249 250 coredump = TRUE; 251#ifdef DDB 252 if (textdump && textdump_pending) { 253 coredump = FALSE; 254 textdump_dumpsys(&dumper); 255 } 256#endif 257 if (coredump) 258 dumpsys(&dumper); 259 260 dumping--; 261 return (0); 262} 263 264static int 265isbufbusy(struct buf *bp) 266{ 267 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 268 BUF_ISLOCKED(bp)) || 269 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 270 return (1); 271 return (0); 272} 273 274/* 275 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 276 */ 277void 278kern_reboot(int howto) 279{ 280 static int first_buf_printf = 1; 281 282#if defined(SMP) 283 /* 284 * Bind us to CPU 0 so that all shutdown code runs there. Some 285 * systems don't shutdown properly (i.e., ACPI power off) if we 286 * run on another processor. 287 */ 288 thread_lock(curthread); 289 sched_bind(curthread, 0); 290 thread_unlock(curthread); 291 KASSERT(PCPU_GET(cpuid) == 0, ("%s: not running on cpu 0", __func__)); 292#endif 293 /* We're in the process of rebooting. */ 294 rebooting = 1; 295 296 /* collect extra flags that shutdown_nice might have set */ 297 howto |= shutdown_howto; 298 299 /* We are out of the debugger now. */ 300 kdb_active = 0; 301 302 /* 303 * Do any callouts that should be done BEFORE syncing the filesystems. 304 */ 305 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 306 307 /* 308 * Now sync filesystems 309 */ 310 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 311 register struct buf *bp; 312 int iter, nbusy, pbusy; 313#ifndef PREEMPTION 314 int subiter; 315#endif 316 317 waittime = 0; 318 319#ifdef SW_WATCHDOG 320 wdog_kern_pat(WD_LASTVAL); 321#endif 322 sync(curthread, NULL); 323 324 /* 325 * With soft updates, some buffers that are 326 * written will be remarked as dirty until other 327 * buffers are written. 328 */ 329 for (iter = pbusy = 0; iter < 20; iter++) { 330 nbusy = 0; 331 for (bp = &buf[nbuf]; --bp >= buf; ) 332 if (isbufbusy(bp)) 333 nbusy++; 334 if (nbusy == 0) { 335 if (first_buf_printf) 336 printf("All buffers synced."); 337 break; 338 } 339 if (first_buf_printf) { 340 printf("Syncing disks, buffers remaining... "); 341 first_buf_printf = 0; 342 } 343 printf("%d ", nbusy); 344 if (nbusy < pbusy) 345 iter = 0; 346 pbusy = nbusy; 347#ifdef SW_WATCHDOG 348 wdog_kern_pat(WD_LASTVAL); 349#endif 350 sync(curthread, NULL); 351 352#ifdef PREEMPTION 353 /* 354 * Drop Giant and spin for a while to allow 355 * interrupt threads to run. 356 */ 357 DROP_GIANT(); 358 DELAY(50000 * iter); 359 PICKUP_GIANT(); 360#else 361 /* 362 * Drop Giant and context switch several times to 363 * allow interrupt threads to run. 364 */ 365 DROP_GIANT(); 366 for (subiter = 0; subiter < 50 * iter; subiter++) { 367 thread_lock(curthread); 368 mi_switch(SW_VOL, NULL); 369 thread_unlock(curthread); 370 DELAY(1000); 371 } 372 PICKUP_GIANT(); 373#endif 374 } 375 printf("\n"); 376 /* 377 * Count only busy local buffers to prevent forcing 378 * a fsck if we're just a client of a wedged NFS server 379 */ 380 nbusy = 0; 381 for (bp = &buf[nbuf]; --bp >= buf; ) { 382 if (isbufbusy(bp)) { 383#if 0 384/* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 385 if (bp->b_dev == NULL) { 386 TAILQ_REMOVE(&mountlist, 387 bp->b_vp->v_mount, mnt_list); 388 continue; 389 } 390#endif 391 nbusy++; 392#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 393 printf( 394 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n", 395 nbusy, bp->b_bufobj, 396 bp->b_flags, (long)bp->b_blkno, 397 (long)bp->b_lblkno); 398#endif 399 } 400 } 401 if (nbusy) { 402 /* 403 * Failed to sync all blocks. Indicate this and don't 404 * unmount filesystems (thus forcing an fsck on reboot). 405 */ 406 printf("Giving up on %d buffers\n", nbusy); 407 DELAY(5000000); /* 5 seconds */ 408 } else { 409 if (!first_buf_printf) 410 printf("Final sync complete\n"); 411 /* 412 * Unmount filesystems 413 */ 414 if (panicstr == 0) 415 vfs_unmountall(); 416 } 417 swapoff_all(); 418 DELAY(100000); /* wait for console output to finish */ 419 } 420 421 print_uptime(); 422 423 /* 424 * Ok, now do things that assume all filesystem activity has 425 * been completed. 426 */ 427 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 428 429 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 430 doadump(TRUE); 431 432 /* Now that we're going to really halt the system... */ 433 EVENTHANDLER_INVOKE(shutdown_final, howto); 434 435 for(;;) ; /* safety against shutdown_reset not working */ 436 /* NOTREACHED */ 437} 438 439/* 440 * If the shutdown was a clean halt, behave accordingly. 441 */ 442static void 443shutdown_halt(void *junk, int howto) 444{ 445 446 if (howto & RB_HALT) { 447 printf("\n"); 448 printf("The operating system has halted.\n"); 449 printf("Please press any key to reboot.\n\n"); 450 switch (cngetc()) { 451 case -1: /* No console, just die */ 452 cpu_halt(); 453 /* NOTREACHED */ 454 default: 455 howto &= ~RB_HALT; 456 break; 457 } 458 } 459} 460 461/* 462 * Check to see if the system paniced, pause and then reboot 463 * according to the specified delay. 464 */ 465static void 466shutdown_panic(void *junk, int howto) 467{ 468 int loop; 469 470 if (howto & RB_DUMP) { 471 if (PANIC_REBOOT_WAIT_TIME != 0) { 472 if (PANIC_REBOOT_WAIT_TIME != -1) { 473 printf("Automatic reboot in %d seconds - " 474 "press a key on the console to abort\n", 475 PANIC_REBOOT_WAIT_TIME); 476 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 477 loop > 0; --loop) { 478 DELAY(1000 * 100); /* 1/10th second */ 479 /* Did user type a key? */ 480 if (cncheckc() != -1) 481 break; 482 } 483 if (!loop) 484 return; 485 } 486 } else { /* zero time specified - reboot NOW */ 487 return; 488 } 489 printf("--> Press a key on the console to reboot,\n"); 490 printf("--> or switch off the system now.\n"); 491 cngetc(); 492 } 493} 494 495/* 496 * Everything done, now reset 497 */ 498static void 499shutdown_reset(void *junk, int howto) 500{ 501 502 printf("Rebooting...\n"); 503 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 504 505 /* 506 * Acquiring smp_ipi_mtx here has a double effect: 507 * - it disables interrupts avoiding CPU0 preemption 508 * by fast handlers (thus deadlocking against other CPUs) 509 * - it avoids deadlocks against smp_rendezvous() or, more 510 * generally, threads busy-waiting, with this spinlock held, 511 * and waiting for responses by threads on other CPUs 512 * (ie. smp_tlb_shootdown()). 513 * 514 * For the !SMP case it just needs to handle the former problem. 515 */ 516#ifdef SMP 517 mtx_lock_spin(&smp_ipi_mtx); 518#else 519 spinlock_enter(); 520#endif 521 522 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 523 cpu_reset(); 524 /* NOTREACHED */ /* assuming reset worked */ 525} 526 527/* 528 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 529 * and then reboots. If we are called twice, then we avoid trying to sync 530 * the disks as this often leads to recursive panics. 531 */ 532void 533panic(const char *fmt, ...) 534{ 535#ifdef SMP 536 static volatile u_int panic_cpu = NOCPU; 537#endif 538 struct thread *td = curthread; 539 int bootopt, newpanic; 540 va_list ap; 541 static char buf[256]; 542 543 critical_enter(); 544#ifdef SMP 545 /* 546 * We don't want multiple CPU's to panic at the same time, so we 547 * use panic_cpu as a simple spinlock. We have to keep checking 548 * panic_cpu if we are spinning in case the panic on the first 549 * CPU is canceled. 550 */ 551 if (panic_cpu != PCPU_GET(cpuid)) 552 while (atomic_cmpset_int(&panic_cpu, NOCPU, 553 PCPU_GET(cpuid)) == 0) 554 while (panic_cpu != NOCPU) 555 ; /* nothing */ 556#endif 557 558 bootopt = RB_AUTOBOOT; 559 newpanic = 0; 560 if (panicstr) 561 bootopt |= RB_NOSYNC; 562 else { 563 bootopt |= RB_DUMP; 564 panicstr = fmt; 565 newpanic = 1; 566 } 567 568 va_start(ap, fmt); 569 if (newpanic) { 570 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 571 panicstr = buf; 572 printf("panic: %s\n", buf); 573 } else { 574 printf("panic: "); 575 vprintf(fmt, ap); 576 printf("\n"); 577 } 578 va_end(ap); 579#ifdef SMP 580 printf("cpuid = %d\n", PCPU_GET(cpuid)); 581#endif 582 583#ifdef KDB 584 if (newpanic && trace_on_panic) 585 kdb_backtrace(); 586 if (debugger_on_panic) 587 kdb_enter(KDB_WHY_PANIC, "panic"); 588#ifdef RESTARTABLE_PANICS 589 /* See if the user aborted the panic, in which case we continue. */ 590 if (panicstr == NULL) { 591#ifdef SMP 592 atomic_store_rel_int(&panic_cpu, NOCPU); 593#endif 594 return; 595 } 596#endif 597#endif 598 /*thread_lock(td); */ 599 td->td_flags |= TDF_INPANIC; 600 /* thread_unlock(td); */ 601 if (!sync_on_panic) 602 bootopt |= RB_NOSYNC; 603 critical_exit(); 604 kern_reboot(bootopt); 605} 606 607/* 608 * Support for poweroff delay. 609 * 610 * Please note that setting this delay too short might power off your machine 611 * before the write cache on your hard disk has been flushed, leading to 612 * soft-updates inconsistencies. 613 */ 614#ifndef POWEROFF_DELAY 615# define POWEROFF_DELAY 5000 616#endif 617static int poweroff_delay = POWEROFF_DELAY; 618 619SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 620 &poweroff_delay, 0, ""); 621 622static void 623poweroff_wait(void *junk, int howto) 624{ 625 626 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 627 return; 628 DELAY(poweroff_delay * 1000); 629} 630 631/* 632 * Some system processes (e.g. syncer) need to be stopped at appropriate 633 * points in their main loops prior to a system shutdown, so that they 634 * won't interfere with the shutdown process (e.g. by holding a disk buf 635 * to cause sync to fail). For each of these system processes, register 636 * shutdown_kproc() as a handler for one of shutdown events. 637 */ 638static int kproc_shutdown_wait = 60; 639SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 640 &kproc_shutdown_wait, 0, ""); 641 642void 643kproc_shutdown(void *arg, int howto) 644{ 645 struct proc *p; 646 int error; 647 648 if (panicstr) 649 return; 650 651 p = (struct proc *)arg; 652 printf("Waiting (max %d seconds) for system process `%s' to stop...", 653 kproc_shutdown_wait, p->p_comm); 654 error = kproc_suspend(p, kproc_shutdown_wait * hz); 655 656 if (error == EWOULDBLOCK) 657 printf("timed out\n"); 658 else 659 printf("done\n"); 660} 661 662void 663kthread_shutdown(void *arg, int howto) 664{ 665 struct thread *td; 666 int error; 667 668 if (panicstr) 669 return; 670 671 td = (struct thread *)arg; 672 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 673 kproc_shutdown_wait, td->td_name); 674 error = kthread_suspend(td, kproc_shutdown_wait * hz); 675 676 if (error == EWOULDBLOCK) 677 printf("timed out\n"); 678 else 679 printf("done\n"); 680} 681 682/* Registration of dumpers */ 683int 684set_dumper(struct dumperinfo *di) 685{ 686 687 if (di == NULL) { 688 bzero(&dumper, sizeof dumper); 689 return (0); 690 } 691 if (dumper.dumper != NULL) 692 return (EBUSY); 693 dumper = *di; 694 return (0); 695} 696 697/* Call dumper with bounds checking. */ 698int 699dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 700 off_t offset, size_t length) 701{ 702 703 if (length != 0 && (offset < di->mediaoffset || 704 offset - di->mediaoffset + length > di->mediasize)) { 705 printf("Attempt to write outside dump device boundaries.\n"); 706 return (ENXIO); 707 } 708 return (di->dumper(di->priv, virtual, physical, offset, length)); 709} 710 711void 712mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 713 uint64_t dumplen, uint32_t blksz) 714{ 715 716 bzero(kdh, sizeof(*kdh)); 717 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 718 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 719 kdh->version = htod32(KERNELDUMPVERSION); 720 kdh->architectureversion = htod32(archver); 721 kdh->dumplength = htod64(dumplen); 722 kdh->dumptime = htod64(time_second); 723 kdh->blocksize = htod32(blksz); 724 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 725 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 726 if (panicstr != NULL) 727 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 728 kdh->parity = kerneldump_parity(kdh); 729} 730