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_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 101 int debugger_on_panic = 0; 102 #else 103 int debugger_on_panic = 1; 104 #endif 105 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 106 &debugger_on_panic, 0, "Run debugger on kernel panic"); 107 TUNABLE_INT("debug.debugger_on_panic", &debugger_on_panic); 108 109 #ifdef KDB_TRACE 110 static int trace_on_panic = 1; 111 #else 112 static int trace_on_panic = 0; 113 #endif 114 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 115 &trace_on_panic, 0, "Print stack trace on kernel panic"); 116 TUNABLE_INT("debug.trace_on_panic", &trace_on_panic); 117 #endif /* KDB */ 118 119 static int sync_on_panic = 0; 120 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RW | CTLFLAG_TUN, 121 &sync_on_panic, 0, "Do a sync before rebooting from a panic"); 122 TUNABLE_INT("kern.sync_on_panic", &sync_on_panic); 123 124 SYSCTL_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 */ 130 const char *panicstr; 131 132 int dumping; /* system is dumping */ 133 int rebooting; /* system is rebooting */ 134 static struct dumperinfo dumper; /* our selected dumper */ 135 136 /* Context information for dump-debuggers. */ 137 static struct pcb dumppcb; /* Registers. */ 138 static lwpid_t dumptid; /* Thread ID. */ 139 140 static void poweroff_wait(void *, int); 141 static void shutdown_halt(void *junk, int howto); 142 static void shutdown_panic(void *junk, int howto); 143 static void shutdown_reset(void *junk, int howto); 144 145 /* register various local shutdown events */ 146 static void 147 shutdown_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 } 159 160 SYSINIT(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 */ 166 int 167 reboot(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 */ 188 static int shutdown_howto = 0; 189 190 void 191 shutdown_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 } 207 static int waittime = -1; 208 209 static void 210 print_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 } 235 236 static void 237 doadump(void) 238 { 239 240 /* 241 * Sometimes people have to call this from the kernel debugger. 242 * (if 'panic' can not dump) 243 * Give them a clue as to why they can't dump. 244 */ 245 if (dumper.dumper == NULL) { 246 printf("Cannot dump. Device not defined or unavailable.\n"); 247 return; 248 } 249 250 savectx(&dumppcb); 251 dumptid = curthread->td_tid; 252 dumping++; 253 #ifdef DDB 254 if (textdump_pending) 255 textdump_dumpsys(&dumper); 256 else 257 #endif 258 dumpsys(&dumper); 259 dumping--; 260 } 261 262 static int 263 isbufbusy(struct buf *bp) 264 { 265 if (((bp->b_flags & (B_INVAL | B_PERSISTENT)) == 0 && 266 BUF_ISLOCKED(bp)) || 267 ((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI)) 268 return (1); 269 return (0); 270 } 271 272 /* 273 * Shutdown the system cleanly to prepare for reboot, halt, or power off. 274 */ 275 void 276 kern_reboot(int howto) 277 { 278 static int first_buf_printf = 1; 279 280 #if defined(SMP) 281 /* 282 * Bind us to CPU 0 so that all shutdown code runs there. Some 283 * systems don't shutdown properly (i.e., ACPI power off) if we 284 * run on another processor. 285 */ 286 thread_lock(curthread); 287 sched_bind(curthread, 0); 288 thread_unlock(curthread); 289 KASSERT(PCPU_GET(cpuid) == 0, ("%s: not running on cpu 0", __func__)); 290 #endif 291 /* We're in the process of rebooting. */ 292 rebooting = 1; 293 294 /* collect extra flags that shutdown_nice might have set */ 295 howto |= shutdown_howto; 296 297 /* We are out of the debugger now. */ 298 kdb_active = 0; 299 300 /* 301 * Do any callouts that should be done BEFORE syncing the filesystems. 302 */ 303 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto); 304 305 /* 306 * Now sync filesystems 307 */ 308 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 309 register struct buf *bp; 310 int iter, nbusy, pbusy; 311 #ifndef PREEMPTION 312 int subiter; 313 #endif 314 315 waittime = 0; 316 317 #ifdef SW_WATCHDOG 318 wdog_kern_pat(WD_LASTVAL); 319 #endif 320 sync(curthread, NULL); 321 322 /* 323 * With soft updates, some buffers that are 324 * written will be remarked as dirty until other 325 * buffers are written. 326 */ 327 for (iter = pbusy = 0; iter < 20; iter++) { 328 nbusy = 0; 329 for (bp = &buf[nbuf]; --bp >= buf; ) 330 if (isbufbusy(bp)) 331 nbusy++; 332 if (nbusy == 0) { 333 if (first_buf_printf) 334 printf("All buffers synced."); 335 break; 336 } 337 if (first_buf_printf) { 338 printf("Syncing disks, buffers remaining... "); 339 first_buf_printf = 0; 340 } 341 printf("%d ", nbusy); 342 if (nbusy < pbusy) 343 iter = 0; 344 pbusy = nbusy; 345 #ifdef SW_WATCHDOG 346 wdog_kern_pat(WD_LASTVAL); 347 #endif 348 sync(curthread, NULL); 349 350 #ifdef PREEMPTION 351 /* 352 * Drop Giant and spin for a while to allow 353 * interrupt threads to run. 354 */ 355 DROP_GIANT(); 356 DELAY(50000 * iter); 357 PICKUP_GIANT(); 358 #else 359 /* 360 * Drop Giant and context switch several times to 361 * allow interrupt threads to run. 362 */ 363 DROP_GIANT(); 364 for (subiter = 0; subiter < 50 * iter; subiter++) { 365 thread_lock(curthread); 366 mi_switch(SW_VOL, NULL); 367 thread_unlock(curthread); 368 DELAY(1000); 369 } 370 PICKUP_GIANT(); 371 #endif 372 } 373 printf("\n"); 374 /* 375 * Count only busy local buffers to prevent forcing 376 * a fsck if we're just a client of a wedged NFS server 377 */ 378 nbusy = 0; 379 for (bp = &buf[nbuf]; --bp >= buf; ) { 380 if (isbufbusy(bp)) { 381 #if 0 382 /* XXX: This is bogus. We should probably have a BO_REMOTE flag instead */ 383 if (bp->b_dev == NULL) { 384 TAILQ_REMOVE(&mountlist, 385 bp->b_vp->v_mount, mnt_list); 386 continue; 387 } 388 #endif 389 nbusy++; 390 #if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC) 391 printf( 392 "%d: bufobj:%p, flags:%0x, blkno:%ld, lblkno:%ld\n", 393 nbusy, bp->b_bufobj, 394 bp->b_flags, (long)bp->b_blkno, 395 (long)bp->b_lblkno); 396 #endif 397 } 398 } 399 if (nbusy) { 400 /* 401 * Failed to sync all blocks. Indicate this and don't 402 * unmount filesystems (thus forcing an fsck on reboot). 403 */ 404 printf("Giving up on %d buffers\n", nbusy); 405 DELAY(5000000); /* 5 seconds */ 406 } else { 407 if (!first_buf_printf) 408 printf("Final sync complete\n"); 409 /* 410 * Unmount filesystems 411 */ 412 if (panicstr == 0) 413 vfs_unmountall(); 414 } 415 swapoff_all(); 416 DELAY(100000); /* wait for console output to finish */ 417 } 418 419 print_uptime(); 420 421 /* 422 * Ok, now do things that assume all filesystem activity has 423 * been completed. 424 */ 425 EVENTHANDLER_INVOKE(shutdown_post_sync, howto); 426 427 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 428 doadump(); 429 430 /* Now that we're going to really halt the system... */ 431 EVENTHANDLER_INVOKE(shutdown_final, howto); 432 433 for(;;) ; /* safety against shutdown_reset not working */ 434 /* NOTREACHED */ 435 } 436 437 /* 438 * If the shutdown was a clean halt, behave accordingly. 439 */ 440 static void 441 shutdown_halt(void *junk, int howto) 442 { 443 444 if (howto & RB_HALT) { 445 printf("\n"); 446 printf("The operating system has halted.\n"); 447 printf("Please press any key to reboot.\n\n"); 448 switch (cngetc()) { 449 case -1: /* No console, just die */ 450 cpu_halt(); 451 /* NOTREACHED */ 452 default: 453 howto &= ~RB_HALT; 454 break; 455 } 456 } 457 } 458 459 /* 460 * Check to see if the system paniced, pause and then reboot 461 * according to the specified delay. 462 */ 463 static void 464 shutdown_panic(void *junk, int howto) 465 { 466 int loop; 467 468 if (howto & RB_DUMP) { 469 if (PANIC_REBOOT_WAIT_TIME != 0) { 470 if (PANIC_REBOOT_WAIT_TIME != -1) { 471 printf("Automatic reboot in %d seconds - " 472 "press a key on the console to abort\n", 473 PANIC_REBOOT_WAIT_TIME); 474 for (loop = PANIC_REBOOT_WAIT_TIME * 10; 475 loop > 0; --loop) { 476 DELAY(1000 * 100); /* 1/10th second */ 477 /* Did user type a key? */ 478 if (cncheckc() != -1) 479 break; 480 } 481 if (!loop) 482 return; 483 } 484 } else { /* zero time specified - reboot NOW */ 485 return; 486 } 487 printf("--> Press a key on the console to reboot,\n"); 488 printf("--> or switch off the system now.\n"); 489 cngetc(); 490 } 491 } 492 493 /* 494 * Everything done, now reset 495 */ 496 static void 497 shutdown_reset(void *junk, int howto) 498 { 499 500 printf("Rebooting...\n"); 501 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 502 503 /* 504 * Acquiring smp_ipi_mtx here has a double effect: 505 * - it disables interrupts avoiding CPU0 preemption 506 * by fast handlers (thus deadlocking against other CPUs) 507 * - it avoids deadlocks against smp_rendezvous() or, more 508 * generally, threads busy-waiting, with this spinlock held, 509 * and waiting for responses by threads on other CPUs 510 * (ie. smp_tlb_shootdown()). 511 * 512 * For the !SMP case it just needs to handle the former problem. 513 */ 514 #ifdef SMP 515 mtx_lock_spin(&smp_ipi_mtx); 516 #else 517 spinlock_enter(); 518 #endif 519 520 /* cpu_boot(howto); */ /* doesn't do anything at the moment */ 521 cpu_reset(); 522 /* NOTREACHED */ /* assuming reset worked */ 523 } 524 525 /* 526 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 527 * and then reboots. If we are called twice, then we avoid trying to sync 528 * the disks as this often leads to recursive panics. 529 */ 530 void 531 panic(const char *fmt, ...) 532 { 533 #ifdef SMP 534 static volatile u_int panic_cpu = NOCPU; 535 #endif 536 struct thread *td = curthread; 537 int bootopt, newpanic; 538 va_list ap; 539 static char buf[256]; 540 541 critical_enter(); 542 #ifdef SMP 543 /* 544 * We don't want multiple CPU's to panic at the same time, so we 545 * use panic_cpu as a simple spinlock. We have to keep checking 546 * panic_cpu if we are spinning in case the panic on the first 547 * CPU is canceled. 548 */ 549 if (panic_cpu != PCPU_GET(cpuid)) 550 while (atomic_cmpset_int(&panic_cpu, NOCPU, 551 PCPU_GET(cpuid)) == 0) 552 while (panic_cpu != NOCPU) 553 ; /* nothing */ 554 #endif 555 556 bootopt = RB_AUTOBOOT | RB_DUMP; 557 newpanic = 0; 558 if (panicstr) 559 bootopt |= RB_NOSYNC; 560 else { 561 panicstr = fmt; 562 newpanic = 1; 563 } 564 565 va_start(ap, fmt); 566 if (newpanic) { 567 (void)vsnprintf(buf, sizeof(buf), fmt, ap); 568 panicstr = buf; 569 printf("panic: %s\n", buf); 570 } else { 571 printf("panic: "); 572 vprintf(fmt, ap); 573 printf("\n"); 574 } 575 va_end(ap); 576 #ifdef SMP 577 printf("cpuid = %d\n", PCPU_GET(cpuid)); 578 #endif 579 580 #ifdef KDB 581 if (newpanic && trace_on_panic) 582 kdb_backtrace(); 583 if (debugger_on_panic) 584 kdb_enter(KDB_WHY_PANIC, "panic"); 585 #ifdef RESTARTABLE_PANICS 586 /* See if the user aborted the panic, in which case we continue. */ 587 if (panicstr == NULL) { 588 #ifdef SMP 589 atomic_store_rel_int(&panic_cpu, NOCPU); 590 #endif 591 return; 592 } 593 #endif 594 #endif 595 /*thread_lock(td); */ 596 td->td_flags |= TDF_INPANIC; 597 /* thread_unlock(td); */ 598 if (!sync_on_panic) 599 bootopt |= RB_NOSYNC; 600 critical_exit(); 601 kern_reboot(bootopt); 602 } 603 604 /* 605 * Support for poweroff delay. 606 * 607 * Please note that setting this delay too short might power off your machine 608 * before the write cache on your hard disk has been flushed, leading to 609 * soft-updates inconsistencies. 610 */ 611 #ifndef POWEROFF_DELAY 612 # define POWEROFF_DELAY 5000 613 #endif 614 static int poweroff_delay = POWEROFF_DELAY; 615 616 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW, 617 &poweroff_delay, 0, ""); 618 619 static void 620 poweroff_wait(void *junk, int howto) 621 { 622 623 if (!(howto & RB_POWEROFF) || poweroff_delay <= 0) 624 return; 625 DELAY(poweroff_delay * 1000); 626 } 627 628 /* 629 * Some system processes (e.g. syncer) need to be stopped at appropriate 630 * points in their main loops prior to a system shutdown, so that they 631 * won't interfere with the shutdown process (e.g. by holding a disk buf 632 * to cause sync to fail). For each of these system processes, register 633 * shutdown_kproc() as a handler for one of shutdown events. 634 */ 635 static int kproc_shutdown_wait = 60; 636 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW, 637 &kproc_shutdown_wait, 0, ""); 638 639 void 640 kproc_shutdown(void *arg, int howto) 641 { 642 struct proc *p; 643 int error; 644 645 if (panicstr) 646 return; 647 648 p = (struct proc *)arg; 649 printf("Waiting (max %d seconds) for system process `%s' to stop...", 650 kproc_shutdown_wait, p->p_comm); 651 error = kproc_suspend(p, kproc_shutdown_wait * hz); 652 653 if (error == EWOULDBLOCK) 654 printf("timed out\n"); 655 else 656 printf("done\n"); 657 } 658 659 void 660 kthread_shutdown(void *arg, int howto) 661 { 662 struct thread *td; 663 int error; 664 665 if (panicstr) 666 return; 667 668 td = (struct thread *)arg; 669 printf("Waiting (max %d seconds) for system thread `%s' to stop...", 670 kproc_shutdown_wait, td->td_name); 671 error = kthread_suspend(td, kproc_shutdown_wait * hz); 672 673 if (error == EWOULDBLOCK) 674 printf("timed out\n"); 675 else 676 printf("done\n"); 677 } 678 679 /* Registration of dumpers */ 680 int 681 set_dumper(struct dumperinfo *di) 682 { 683 684 if (di == NULL) { 685 bzero(&dumper, sizeof dumper); 686 return (0); 687 } 688 if (dumper.dumper != NULL) 689 return (EBUSY); 690 dumper = *di; 691 return (0); 692 } 693 694 /* Call dumper with bounds checking. */ 695 int 696 dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical, 697 off_t offset, size_t length) 698 { 699 700 if (length != 0 && (offset < di->mediaoffset || 701 offset - di->mediaoffset + length > di->mediasize)) { 702 printf("Attempt to write outside dump device boundaries.\n"); 703 return (ENXIO); 704 } 705 return (di->dumper(di->priv, virtual, physical, offset, length)); 706 } 707 708 void 709 mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver, 710 uint64_t dumplen, uint32_t blksz) 711 { 712 713 bzero(kdh, sizeof(*kdh)); 714 strncpy(kdh->magic, magic, sizeof(kdh->magic)); 715 strncpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture)); 716 kdh->version = htod32(KERNELDUMPVERSION); 717 kdh->architectureversion = htod32(archver); 718 kdh->dumplength = htod64(dumplen); 719 kdh->dumptime = htod64(time_second); 720 kdh->blocksize = htod32(blksz); 721 strncpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname)); 722 strncpy(kdh->versionstring, version, sizeof(kdh->versionstring)); 723 if (panicstr != NULL) 724 strncpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring)); 725 kdh->parity = kerneldump_parity(kdh); 726 } 727