2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1986, 1988, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
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20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
45 #include "opt_panic.h"
46 #include "opt_printf.h"
47 #include "opt_sched.h"
48 #include "opt_watchdog.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
53 #include <sys/boottrace.h>
56 #include <sys/compressor.h>
59 #include <sys/eventhandler.h>
60 #include <sys/filedesc.h>
63 #include <sys/kernel.h>
64 #include <sys/kerneldump.h>
65 #include <sys/kthread.h>
67 #include <sys/malloc.h>
69 #include <sys/mount.h>
72 #include <sys/reboot.h>
73 #include <sys/resourcevar.h>
74 #include <sys/rwlock.h>
76 #include <sys/sched.h>
78 #include <sys/sysctl.h>
79 #include <sys/sysproto.h>
80 #include <sys/taskqueue.h>
81 #include <sys/vnode.h>
82 #include <sys/watchdog.h>
84 #include <crypto/chacha20/chacha.h>
85 #include <crypto/rijndael/rijndael-api-fst.h>
86 #include <crypto/sha2/sha256.h>
90 #include <machine/cpu.h>
91 #include <machine/dump.h>
92 #include <machine/pcb.h>
93 #include <machine/smp.h>
95 #include <security/mac/mac_framework.h>
98 #include <vm/vm_object.h>
99 #include <vm/vm_page.h>
100 #include <vm/vm_pager.h>
101 #include <vm/swap_pager.h>
103 #include <sys/signalvar.h>
105 static MALLOC_DEFINE(M_DUMPER, "dumper", "dumper block buffer");
107 #ifndef PANIC_REBOOT_WAIT_TIME
108 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
110 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME;
111 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN,
112 &panic_reboot_wait_time, 0,
113 "Seconds to wait before rebooting after a panic");
114 static int reboot_wait_time = 0;
115 SYSCTL_INT(_kern, OID_AUTO, reboot_wait_time, CTLFLAG_RWTUN,
116 &reboot_wait_time, 0,
117 "Seconds to wait before rebooting");
120 * Note that stdarg.h and the ANSI style va_start macro is used for both
121 * ANSI and traditional C compilers.
123 #include <machine/stdarg.h>
126 #ifdef KDB_UNATTENDED
127 int debugger_on_panic = 0;
129 int debugger_on_panic = 1;
131 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic,
132 CTLFLAG_RWTUN, &debugger_on_panic, 0,
133 "Run debugger on kernel panic");
135 static bool debugger_on_recursive_panic = false;
136 SYSCTL_BOOL(_debug, OID_AUTO, debugger_on_recursive_panic,
137 CTLFLAG_RWTUN, &debugger_on_recursive_panic, 0,
138 "Run debugger on recursive kernel panic");
140 int debugger_on_trap = 0;
141 SYSCTL_INT(_debug, OID_AUTO, debugger_on_trap,
142 CTLFLAG_RWTUN, &debugger_on_trap, 0,
143 "Run debugger on kernel trap before panic");
146 static int trace_on_panic = 1;
147 static bool trace_all_panics = true;
149 static int trace_on_panic = 0;
150 static bool trace_all_panics = false;
152 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
153 CTLFLAG_RWTUN | CTLFLAG_SECURE,
154 &trace_on_panic, 0, "Print stack trace on kernel panic");
155 SYSCTL_BOOL(_debug, OID_AUTO, trace_all_panics, CTLFLAG_RWTUN,
156 &trace_all_panics, 0, "Print stack traces on secondary kernel panics");
159 static int sync_on_panic = 0;
160 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN,
161 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
163 static bool poweroff_on_panic = 0;
164 SYSCTL_BOOL(_kern, OID_AUTO, poweroff_on_panic, CTLFLAG_RWTUN,
165 &poweroff_on_panic, 0, "Do a power off instead of a reboot on a panic");
167 static bool powercycle_on_panic = 0;
168 SYSCTL_BOOL(_kern, OID_AUTO, powercycle_on_panic, CTLFLAG_RWTUN,
169 &powercycle_on_panic, 0, "Do a power cycle instead of a reboot on a panic");
171 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
172 "Shutdown environment");
175 static int show_busybufs;
177 static int show_busybufs = 1;
179 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
181 "Show busy buffers during shutdown");
183 int suspend_blocked = 0;
184 SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW,
185 &suspend_blocked, 0, "Block suspend due to a pending shutdown");
188 FEATURE(ekcd, "Encrypted kernel crash dumps support");
190 MALLOC_DEFINE(M_EKCD, "ekcd", "Encrypted kernel crash dumps data");
192 struct kerneldumpcrypto {
193 uint8_t kdc_encryption;
194 uint8_t kdc_iv[KERNELDUMP_IV_MAX_SIZE];
198 cipherInstance aes_ci;
200 struct chacha_ctx u_chacha;
202 #define kdc_ki u.u_aes.aes_ki
203 #define kdc_ci u.u_aes.aes_ci
204 #define kdc_chacha u.u_chacha
205 uint32_t kdc_dumpkeysize;
206 struct kerneldumpkey kdc_dumpkey[];
210 struct kerneldumpcomp {
212 struct compressor *kdc_stream;
217 static struct kerneldumpcomp *kerneldumpcomp_create(struct dumperinfo *di,
218 uint8_t compression);
219 static void kerneldumpcomp_destroy(struct dumperinfo *di);
220 static int kerneldumpcomp_write_cb(void *base, size_t len, off_t off, void *arg);
222 static int kerneldump_gzlevel = 6;
223 SYSCTL_INT(_kern, OID_AUTO, kerneldump_gzlevel, CTLFLAG_RWTUN,
224 &kerneldump_gzlevel, 0,
225 "Kernel crash dump compression level");
228 * Variable panicstr contains argument to first call to panic; used as flag
229 * to indicate that the kernel has already called panic.
231 const char *panicstr;
232 bool __read_frequently panicked;
234 int __read_mostly dumping; /* system is dumping */
235 int rebooting; /* system is rebooting */
237 * Used to serialize between sysctl kern.shutdown.dumpdevname and list
238 * modifications via ioctl.
240 static struct mtx dumpconf_list_lk;
241 MTX_SYSINIT(dumper_configs, &dumpconf_list_lk, "dumper config list", MTX_DEF);
243 /* Our selected dumper(s). */
244 static TAILQ_HEAD(dumpconflist, dumperinfo) dumper_configs =
245 TAILQ_HEAD_INITIALIZER(dumper_configs);
247 /* Context information for dump-debuggers, saved by the dump_savectx() macro. */
248 struct pcb dumppcb; /* Registers. */
249 lwpid_t dumptid; /* Thread ID. */
251 static struct cdevsw reroot_cdevsw = {
252 .d_version = D_VERSION,
256 static void poweroff_wait(void *, int);
257 static void shutdown_halt(void *junk, int howto);
258 static void shutdown_panic(void *junk, int howto);
259 static void shutdown_reset(void *junk, int howto);
260 static int kern_reroot(void);
262 /* register various local shutdown events */
264 shutdown_conf(void *unused)
267 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
269 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
270 SHUTDOWN_PRI_LAST + 100);
271 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
272 SHUTDOWN_PRI_LAST + 100);
275 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
278 * The only reason this exists is to create the /dev/reroot/ directory,
279 * used by reroot code in init(8) as a mountpoint for tmpfs.
282 reroot_conf(void *unused)
287 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev,
288 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot");
290 printf("%s: failed to create device node, error %d",
295 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL);
298 * The system call that results in a reboot.
302 sys_reboot(struct thread *td, struct reboot_args *uap)
308 error = mac_system_check_reboot(td->td_ucred, uap->opt);
311 error = priv_check(td, PRIV_REBOOT);
313 if (uap->opt & RB_REROOT)
314 error = kern_reroot();
316 kern_reboot(uap->opt);
322 shutdown_nice_task_fn(void *arg, int pending __unused)
326 howto = (uintptr_t)arg;
327 /* Send a signal to init(8) and have it shutdown the world. */
329 if ((howto & RB_POWEROFF) != 0) {
330 BOOTTRACE("SIGUSR2 to init(8)");
331 kern_psignal(initproc, SIGUSR2);
332 } else if ((howto & RB_POWERCYCLE) != 0) {
333 BOOTTRACE("SIGWINCH to init(8)");
334 kern_psignal(initproc, SIGWINCH);
335 } else if ((howto & RB_HALT) != 0) {
336 BOOTTRACE("SIGUSR1 to init(8)");
337 kern_psignal(initproc, SIGUSR1);
339 BOOTTRACE("SIGINT to init(8)");
340 kern_psignal(initproc, SIGINT);
342 PROC_UNLOCK(initproc);
345 static struct task shutdown_nice_task = TASK_INITIALIZER(0,
346 &shutdown_nice_task_fn, NULL);
349 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
352 shutdown_nice(int howto)
355 if (initproc != NULL && !SCHEDULER_STOPPED()) {
356 BOOTTRACE("shutdown initiated");
357 shutdown_nice_task.ta_context = (void *)(uintptr_t)howto;
358 taskqueue_enqueue(taskqueue_fast, &shutdown_nice_task);
361 * No init(8) running, or scheduler would not allow it
362 * to run, so simply reboot.
364 kern_reboot(howto | RB_NOSYNC);
377 if (ts.tv_sec >= 86400) {
378 printf("%ldd", (long)ts.tv_sec / 86400);
382 if (f || ts.tv_sec >= 3600) {
383 printf("%ldh", (long)ts.tv_sec / 3600);
387 if (f || ts.tv_sec >= 60) {
388 printf("%ldm", (long)ts.tv_sec / 60);
392 printf("%lds\n", (long)ts.tv_sec);
396 doadump(boolean_t textdump)
404 if (TAILQ_EMPTY(&dumper_configs))
412 if (textdump && textdump_pending) {
414 textdump_dumpsys(TAILQ_FIRST(&dumper_configs));
418 struct dumperinfo *di;
420 TAILQ_FOREACH(di, &dumper_configs, di_next) {
432 * Trace the shutdown reason.
435 reboottrace(int howto)
437 if ((howto & RB_DUMP) != 0) {
438 if ((howto & RB_HALT) != 0)
439 BOOTTRACE("system panic: halting...");
440 if ((howto & RB_POWEROFF) != 0)
441 BOOTTRACE("system panic: powering off...");
442 if ((howto & (RB_HALT|RB_POWEROFF)) == 0)
443 BOOTTRACE("system panic: rebooting...");
445 if ((howto & RB_HALT) != 0)
446 BOOTTRACE("system halting...");
447 if ((howto & RB_POWEROFF) != 0)
448 BOOTTRACE("system powering off...");
449 if ((howto & (RB_HALT|RB_POWEROFF)) == 0)
450 BOOTTRACE("system rebooting...");
455 * kern_reboot(9): Shut down the system cleanly to prepare for reboot, halt, or
459 kern_reboot(int howto)
463 if (initproc != NULL && curproc != initproc)
464 BOOTTRACE("kernel shutdown (dirty) started");
466 BOOTTRACE("kernel shutdown (clean) started");
469 * Normal paths here don't hold Giant, but we can wind up here
470 * unexpectedly with it held. Drop it now so we don't have to
471 * drop and pick it up elsewhere. The paths it is locking will
472 * never be returned to, and it is preferable to preclude
473 * deadlock than to lock against code that won't ever
476 while (mtx_owned(&Giant))
481 * Bind us to the first CPU so that all shutdown code runs there. Some
482 * systems don't shutdown properly (i.e., ACPI power off) if we
483 * run on another processor.
485 if (!SCHEDULER_STOPPED()) {
486 thread_lock(curthread);
487 sched_bind(curthread, CPU_FIRST());
488 thread_unlock(curthread);
489 KASSERT(PCPU_GET(cpuid) == CPU_FIRST(),
490 ("%s: not running on cpu 0", __func__));
493 /* We're in the process of rebooting. */
497 /* We are out of the debugger now. */
501 * Do any callouts that should be done BEFORE syncing the filesystems.
503 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
504 BOOTTRACE("shutdown pre sync complete");
507 * Now sync filesystems
509 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) {
511 BOOTTRACE("bufshutdown begin");
512 bufshutdown(show_busybufs);
513 BOOTTRACE("bufshutdown end");
521 * Ok, now do things that assume all filesystem activity has
524 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
525 BOOTTRACE("shutdown post sync complete");
527 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
530 /* Now that we're going to really halt the system... */
531 BOOTTRACE("shutdown final begin");
534 boottrace_dump_console();
536 EVENTHANDLER_INVOKE(shutdown_final, howto);
539 * Call this directly so that reset is attempted even if shutdown
540 * handlers are not yet registered.
542 shutdown_reset(NULL, howto);
544 for(;;) ; /* safety against shutdown_reset not working */
549 * The system call that results in changing the rootfs.
554 struct vnode *oldrootvnode, *vp;
555 struct mount *mp, *devmp;
558 if (curproc != initproc)
562 * Mark the filesystem containing currently-running executable
563 * (the temporary copy of init(8)) busy.
565 vp = curproc->p_textvp;
566 error = vn_lock(vp, LK_SHARED);
570 error = vfs_busy(mp, MBF_NOWAIT);
574 error = vfs_busy(mp, 0);
575 vn_lock(vp, LK_SHARED | LK_RETRY);
581 if (VN_IS_DOOMED(vp)) {
590 * Remove the filesystem containing currently-running executable
591 * from the mount list, to prevent it from being unmounted
592 * by vfs_unmountall(), and to avoid confusing vfs_mountroot().
594 * Also preserve /dev - forcibly unmounting it could cause driver
602 mtx_lock(&mountlist_mtx);
603 TAILQ_REMOVE(&mountlist, mp, mnt_list);
604 TAILQ_REMOVE(&mountlist, devmp, mnt_list);
605 mtx_unlock(&mountlist_mtx);
607 oldrootvnode = rootvnode;
610 * Unmount everything except for the two filesystems preserved above.
615 * Add /dev back; vfs_mountroot() will move it into its new place.
617 mtx_lock(&mountlist_mtx);
618 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list);
619 mtx_unlock(&mountlist_mtx);
624 * Mount the new rootfs.
629 * Update all references to the old rootvnode.
631 mountcheckdirs(oldrootvnode, rootvnode);
634 * Add the temporary filesystem back and unbusy it.
636 mtx_lock(&mountlist_mtx);
637 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
638 mtx_unlock(&mountlist_mtx);
645 * If the shutdown was a clean halt, behave accordingly.
648 shutdown_halt(void *junk, int howto)
651 if (howto & RB_HALT) {
653 printf("The operating system has halted.\n");
654 printf("Please press any key to reboot.\n\n");
656 wdog_kern_pat(WD_TO_NEVER);
659 case -1: /* No console, just die */
669 * Check to see if the system panicked, pause and then reboot
670 * according to the specified delay.
673 shutdown_panic(void *junk, int howto)
677 if (howto & RB_DUMP) {
678 if (panic_reboot_wait_time != 0) {
679 if (panic_reboot_wait_time != -1) {
680 printf("Automatic reboot in %d seconds - "
681 "press a key on the console to abort\n",
682 panic_reboot_wait_time);
683 for (loop = panic_reboot_wait_time * 10;
685 DELAY(1000 * 100); /* 1/10th second */
686 /* Did user type a key? */
687 if (cncheckc() != -1)
693 } else { /* zero time specified - reboot NOW */
696 printf("--> Press a key on the console to reboot,\n");
697 printf("--> or switch off the system now.\n");
703 * Everything done, now reset
706 shutdown_reset(void *junk, int howto)
709 printf("Rebooting...\n");
710 DELAY(reboot_wait_time * 1000000);
713 * Acquiring smp_ipi_mtx here has a double effect:
714 * - it disables interrupts avoiding CPU0 preemption
715 * by fast handlers (thus deadlocking against other CPUs)
716 * - it avoids deadlocks against smp_rendezvous() or, more
717 * generally, threads busy-waiting, with this spinlock held,
718 * and waiting for responses by threads on other CPUs
719 * (ie. smp_tlb_shootdown()).
721 * For the !SMP case it just needs to handle the former problem.
724 mtx_lock_spin(&smp_ipi_mtx);
730 /* NOTREACHED */ /* assuming reset worked */
733 #if defined(WITNESS) || defined(INVARIANT_SUPPORT)
734 static int kassert_warn_only = 0;
736 static int kassert_do_kdb = 0;
739 static int kassert_do_ktr = 0;
741 static int kassert_do_log = 1;
742 static int kassert_log_pps_limit = 4;
743 static int kassert_log_mute_at = 0;
744 static int kassert_log_panic_at = 0;
745 static int kassert_suppress_in_panic = 0;
746 static int kassert_warnings = 0;
748 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
751 #ifdef KASSERT_PANIC_OPTIONAL
752 #define KASSERT_RWTUN CTLFLAG_RWTUN
754 #define KASSERT_RWTUN CTLFLAG_RDTUN
757 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, KASSERT_RWTUN,
758 &kassert_warn_only, 0,
759 "KASSERT triggers a panic (0) or just a warning (1)");
762 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, KASSERT_RWTUN,
763 &kassert_do_kdb, 0, "KASSERT will enter the debugger");
767 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, KASSERT_RWTUN,
769 "KASSERT does a KTR, set this to the KTRMASK you want");
772 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, KASSERT_RWTUN,
774 "If warn_only is enabled, log (1) or do not log (0) assertion violations");
776 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RD | CTLFLAG_STATS,
777 &kassert_warnings, 0, "number of KASSERTs that have been triggered");
779 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, KASSERT_RWTUN,
780 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
782 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, KASSERT_RWTUN,
783 &kassert_log_pps_limit, 0, "limit number of log messages per second");
785 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, KASSERT_RWTUN,
786 &kassert_log_mute_at, 0, "max number of KASSERTS to log");
788 SYSCTL_INT(_debug_kassert, OID_AUTO, suppress_in_panic, KASSERT_RWTUN,
789 &kassert_suppress_in_panic, 0,
790 "KASSERTs will be suppressed while handling a panic");
793 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
795 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
796 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE, NULL, 0,
797 kassert_sysctl_kassert, "I",
798 "set to trigger a test kassert");
801 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
805 error = sysctl_wire_old_buffer(req, sizeof(int));
808 error = sysctl_handle_int(oidp, &i, 0, req);
810 if (error != 0 || req->newptr == NULL)
812 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
816 #ifdef KASSERT_PANIC_OPTIONAL
818 * Called by KASSERT, this decides if we will panic
819 * or if we will log via printf and/or ktr.
822 kassert_panic(const char *fmt, ...)
824 static char buf[256];
828 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
832 * If we are suppressing secondary panics, log the warning but do not
833 * re-enter panic/kdb.
835 if (KERNEL_PANICKED() && kassert_suppress_in_panic) {
836 if (kassert_do_log) {
837 printf("KASSERT failed: %s\n", buf);
839 if (trace_all_panics && trace_on_panic)
847 * panic if we're not just warning, or if we've exceeded
848 * kassert_log_panic_at warnings.
850 if (!kassert_warn_only ||
851 (kassert_log_panic_at > 0 &&
852 kassert_warnings >= kassert_log_panic_at)) {
862 * log if we've not yet met the mute limit.
864 if (kassert_do_log &&
865 (kassert_log_mute_at == 0 ||
866 kassert_warnings < kassert_log_mute_at)) {
867 static struct timeval lasterr;
870 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
871 printf("KASSERT failed: %s\n", buf);
876 if (kassert_do_kdb) {
877 kdb_enter(KDB_WHY_KASSERT, buf);
880 atomic_add_int(&kassert_warnings, 1);
882 #endif /* KASSERT_PANIC_OPTIONAL */
886 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
887 * and then reboots. If we are called twice, then we avoid trying to sync
888 * the disks as this often leads to recursive panics.
891 panic(const char *fmt, ...)
900 vpanic(const char *fmt, va_list ap)
905 struct thread *td = curthread;
906 int bootopt, newpanic;
907 static char buf[256];
913 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from
914 * concurrently entering panic. Only the winner will proceed
917 if (panicstr == NULL && !kdb_active) {
918 other_cpus = all_cpus;
919 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
920 stop_cpus_hard(other_cpus);
925 * Ensure that the scheduler is stopped while panicking, even if panic
926 * has been entered from kdb.
928 td->td_stopsched = 1;
930 bootopt = RB_AUTOBOOT;
932 if (KERNEL_PANICKED())
933 bootopt |= RB_NOSYNC;
942 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
945 printf("panic: %s\n", buf);
952 printf("cpuid = %d\n", PCPU_GET(cpuid));
954 printf("time = %jd\n", (intmax_t )time_second);
956 if ((newpanic || trace_all_panics) && trace_on_panic)
958 if (debugger_on_panic)
959 kdb_enter(KDB_WHY_PANIC, "panic");
960 else if (!newpanic && debugger_on_recursive_panic)
961 kdb_enter(KDB_WHY_PANIC, "re-panic");
963 /*thread_lock(td); */
964 td->td_flags |= TDF_INPANIC;
965 /* thread_unlock(td); */
967 bootopt |= RB_NOSYNC;
968 if (poweroff_on_panic)
969 bootopt |= RB_POWEROFF;
970 if (powercycle_on_panic)
971 bootopt |= RB_POWERCYCLE;
972 kern_reboot(bootopt);
976 * Support for poweroff delay.
978 * Please note that setting this delay too short might power off your machine
979 * before the write cache on your hard disk has been flushed, leading to
980 * soft-updates inconsistencies.
982 #ifndef POWEROFF_DELAY
983 # define POWEROFF_DELAY 5000
985 static int poweroff_delay = POWEROFF_DELAY;
987 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
988 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
991 poweroff_wait(void *junk, int howto)
994 if ((howto & (RB_POWEROFF | RB_POWERCYCLE)) == 0 || poweroff_delay <= 0)
996 DELAY(poweroff_delay * 1000);
1000 * Some system processes (e.g. syncer) need to be stopped at appropriate
1001 * points in their main loops prior to a system shutdown, so that they
1002 * won't interfere with the shutdown process (e.g. by holding a disk buf
1003 * to cause sync to fail). For each of these system processes, register
1004 * shutdown_kproc() as a handler for one of shutdown events.
1006 static int kproc_shutdown_wait = 60;
1007 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
1008 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
1011 kproc_shutdown(void *arg, int howto)
1016 if (KERNEL_PANICKED())
1019 p = (struct proc *)arg;
1020 printf("Waiting (max %d seconds) for system process `%s' to stop... ",
1021 kproc_shutdown_wait, p->p_comm);
1022 error = kproc_suspend(p, kproc_shutdown_wait * hz);
1024 if (error == EWOULDBLOCK)
1025 printf("timed out\n");
1031 kthread_shutdown(void *arg, int howto)
1036 if (KERNEL_PANICKED())
1039 td = (struct thread *)arg;
1040 printf("Waiting (max %d seconds) for system thread `%s' to stop... ",
1041 kproc_shutdown_wait, td->td_name);
1042 error = kthread_suspend(td, kproc_shutdown_wait * hz);
1044 if (error == EWOULDBLOCK)
1045 printf("timed out\n");
1051 dumpdevname_sysctl_handler(SYSCTL_HANDLER_ARGS)
1054 struct dumperinfo *di;
1058 error = sysctl_wire_old_buffer(req, 0);
1062 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req);
1064 mtx_lock(&dumpconf_list_lk);
1065 TAILQ_FOREACH(di, &dumper_configs, di_next) {
1066 if (di != TAILQ_FIRST(&dumper_configs))
1067 sbuf_putc(&sb, ',');
1068 sbuf_cat(&sb, di->di_devname);
1070 mtx_unlock(&dumpconf_list_lk);
1072 error = sbuf_finish(&sb);
1076 SYSCTL_PROC(_kern_shutdown, OID_AUTO, dumpdevname,
1077 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, &dumper_configs, 0,
1078 dumpdevname_sysctl_handler, "A",
1079 "Device(s) for kernel dumps");
1081 static int _dump_append(struct dumperinfo *di, void *virtual, size_t length);
1084 static struct kerneldumpcrypto *
1085 kerneldumpcrypto_create(size_t blocksize, uint8_t encryption,
1086 const uint8_t *key, uint32_t encryptedkeysize, const uint8_t *encryptedkey)
1088 struct kerneldumpcrypto *kdc;
1089 struct kerneldumpkey *kdk;
1090 uint32_t dumpkeysize;
1092 dumpkeysize = roundup2(sizeof(*kdk) + encryptedkeysize, blocksize);
1093 kdc = malloc(sizeof(*kdc) + dumpkeysize, M_EKCD, M_WAITOK | M_ZERO);
1095 arc4rand(kdc->kdc_iv, sizeof(kdc->kdc_iv), 0);
1097 kdc->kdc_encryption = encryption;
1098 switch (kdc->kdc_encryption) {
1099 case KERNELDUMP_ENC_AES_256_CBC:
1100 if (rijndael_makeKey(&kdc->kdc_ki, DIR_ENCRYPT, 256, key) <= 0)
1103 case KERNELDUMP_ENC_CHACHA20:
1104 chacha_keysetup(&kdc->kdc_chacha, key, 256);
1110 kdc->kdc_dumpkeysize = dumpkeysize;
1111 kdk = kdc->kdc_dumpkey;
1112 kdk->kdk_encryption = kdc->kdc_encryption;
1113 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv));
1114 kdk->kdk_encryptedkeysize = htod32(encryptedkeysize);
1115 memcpy(kdk->kdk_encryptedkey, encryptedkey, encryptedkeysize);
1124 kerneldumpcrypto_init(struct kerneldumpcrypto *kdc)
1126 uint8_t hash[SHA256_DIGEST_LENGTH];
1128 struct kerneldumpkey *kdk;
1137 * When a user enters ddb it can write a crash dump multiple times.
1138 * Each time it should be encrypted using a different IV.
1141 SHA256_Update(&ctx, kdc->kdc_iv, sizeof(kdc->kdc_iv));
1142 SHA256_Final(hash, &ctx);
1143 bcopy(hash, kdc->kdc_iv, sizeof(kdc->kdc_iv));
1145 switch (kdc->kdc_encryption) {
1146 case KERNELDUMP_ENC_AES_256_CBC:
1147 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC,
1148 kdc->kdc_iv) <= 0) {
1153 case KERNELDUMP_ENC_CHACHA20:
1154 chacha_ivsetup(&kdc->kdc_chacha, kdc->kdc_iv, NULL);
1161 kdk = kdc->kdc_dumpkey;
1162 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv));
1164 explicit_bzero(hash, sizeof(hash));
1169 kerneldumpcrypto_dumpkeysize(const struct kerneldumpcrypto *kdc)
1174 return (kdc->kdc_dumpkeysize);
1178 static struct kerneldumpcomp *
1179 kerneldumpcomp_create(struct dumperinfo *di, uint8_t compression)
1181 struct kerneldumpcomp *kdcomp;
1184 switch (compression) {
1185 case KERNELDUMP_COMP_GZIP:
1186 format = COMPRESS_GZIP;
1188 case KERNELDUMP_COMP_ZSTD:
1189 format = COMPRESS_ZSTD;
1195 kdcomp = malloc(sizeof(*kdcomp), M_DUMPER, M_WAITOK | M_ZERO);
1196 kdcomp->kdc_format = compression;
1197 kdcomp->kdc_stream = compressor_init(kerneldumpcomp_write_cb,
1198 format, di->maxiosize, kerneldump_gzlevel, di);
1199 if (kdcomp->kdc_stream == NULL) {
1200 free(kdcomp, M_DUMPER);
1203 kdcomp->kdc_buf = malloc(di->maxiosize, M_DUMPER, M_WAITOK | M_NODUMP);
1208 kerneldumpcomp_destroy(struct dumperinfo *di)
1210 struct kerneldumpcomp *kdcomp;
1212 kdcomp = di->kdcomp;
1215 compressor_fini(kdcomp->kdc_stream);
1216 zfree(kdcomp->kdc_buf, M_DUMPER);
1217 free(kdcomp, M_DUMPER);
1221 * Free a dumper. Must not be present on global list.
1224 dumper_destroy(struct dumperinfo *di)
1230 zfree(di->blockbuf, M_DUMPER);
1231 kerneldumpcomp_destroy(di);
1233 zfree(di->kdcrypto, M_EKCD);
1235 zfree(di, M_DUMPER);
1239 * Allocate and set up a new dumper from the provided template.
1242 dumper_create(const struct dumperinfo *di_template, const char *devname,
1243 const struct diocskerneldump_arg *kda, struct dumperinfo **dip)
1245 struct dumperinfo *newdi;
1251 /* Allocate a new dumper */
1252 newdi = malloc(sizeof(*newdi) + strlen(devname) + 1, M_DUMPER,
1254 memcpy(newdi, di_template, sizeof(*newdi));
1255 newdi->blockbuf = NULL;
1256 newdi->kdcrypto = NULL;
1257 newdi->kdcomp = NULL;
1258 strcpy(newdi->di_devname, devname);
1260 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) {
1262 newdi->kdcrypto = kerneldumpcrypto_create(newdi->blocksize,
1263 kda->kda_encryption, kda->kda_key,
1264 kda->kda_encryptedkeysize, kda->kda_encryptedkey);
1265 if (newdi->kdcrypto == NULL) {
1274 if (kda->kda_compression != KERNELDUMP_COMP_NONE) {
1277 * We can't support simultaneous unpadded block cipher
1278 * encryption and compression because there is no guarantee the
1279 * length of the compressed result is exactly a multiple of the
1280 * cipher block size.
1282 if (kda->kda_encryption == KERNELDUMP_ENC_AES_256_CBC) {
1287 newdi->kdcomp = kerneldumpcomp_create(newdi,
1288 kda->kda_compression);
1289 if (newdi->kdcomp == NULL) {
1294 newdi->blockbuf = malloc(newdi->blocksize, M_DUMPER, M_WAITOK | M_ZERO);
1299 dumper_destroy(newdi);
1304 * Create a new dumper and register it in the global list.
1307 dumper_insert(const struct dumperinfo *di_template, const char *devname,
1308 const struct diocskerneldump_arg *kda)
1310 struct dumperinfo *newdi, *listdi;
1315 index = kda->kda_index;
1316 MPASS(index != KDA_REMOVE && index != KDA_REMOVE_DEV &&
1317 index != KDA_REMOVE_ALL);
1319 error = priv_check(curthread, PRIV_SETDUMPER);
1323 error = dumper_create(di_template, devname, kda, &newdi);
1327 /* Add the new configuration to the queue */
1328 mtx_lock(&dumpconf_list_lk);
1330 TAILQ_FOREACH(listdi, &dumper_configs, di_next) {
1332 TAILQ_INSERT_BEFORE(listdi, newdi, di_next);
1339 TAILQ_INSERT_TAIL(&dumper_configs, newdi, di_next);
1340 mtx_unlock(&dumpconf_list_lk);
1347 dumper_ddb_insert(struct dumperinfo *newdi)
1349 TAILQ_INSERT_HEAD(&dumper_configs, newdi, di_next);
1353 dumper_ddb_remove(struct dumperinfo *di)
1355 TAILQ_REMOVE(&dumper_configs, di, di_next);
1360 dumper_config_match(const struct dumperinfo *di, const char *devname,
1361 const struct diocskerneldump_arg *kda)
1363 if (kda->kda_index == KDA_REMOVE_ALL)
1366 if (strcmp(di->di_devname, devname) != 0)
1370 * Allow wildcard removal of configs matching a device on g_dev_orphan.
1372 if (kda->kda_index == KDA_REMOVE_DEV)
1375 if (di->kdcomp != NULL) {
1376 if (di->kdcomp->kdc_format != kda->kda_compression)
1378 } else if (kda->kda_compression != KERNELDUMP_COMP_NONE)
1381 if (di->kdcrypto != NULL) {
1382 if (di->kdcrypto->kdc_encryption != kda->kda_encryption)
1385 * Do we care to verify keys match to delete? It seems weird
1386 * to expect multiple fallback dump configurations on the same
1387 * device that only differ in crypto key.
1391 if (kda->kda_encryption != KERNELDUMP_ENC_NONE)
1398 * Remove and free the requested dumper(s) from the global list.
1401 dumper_remove(const char *devname, const struct diocskerneldump_arg *kda)
1403 struct dumperinfo *di, *sdi;
1407 error = priv_check(curthread, PRIV_SETDUMPER);
1412 * Try to find a matching configuration, and kill it.
1414 * NULL 'kda' indicates remove any configuration matching 'devname',
1415 * which may remove multiple configurations in atypical configurations.
1418 mtx_lock(&dumpconf_list_lk);
1419 TAILQ_FOREACH_SAFE(di, &dumper_configs, di_next, sdi) {
1420 if (dumper_config_match(di, devname, kda)) {
1422 TAILQ_REMOVE(&dumper_configs, di, di_next);
1426 mtx_unlock(&dumpconf_list_lk);
1428 /* Only produce ENOENT if a more targeted match didn't match. */
1429 if (!found && kda->kda_index == KDA_REMOVE)
1435 dump_check_bounds(struct dumperinfo *di, off_t offset, size_t length)
1438 if (di->mediasize > 0 && length != 0 && (offset < di->mediaoffset ||
1439 offset - di->mediaoffset + length > di->mediasize)) {
1440 if (di->kdcomp != NULL && offset >= di->mediaoffset) {
1442 "Compressed dump failed to fit in device boundaries.\n");
1446 printf("Attempt to write outside dump device boundaries.\n"
1447 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
1448 (intmax_t)offset, (intmax_t)di->mediaoffset,
1449 (uintmax_t)length, (intmax_t)di->mediasize);
1452 if (length % di->blocksize != 0) {
1453 printf("Attempt to write partial block of length %ju.\n",
1457 if (offset % di->blocksize != 0) {
1458 printf("Attempt to write at unaligned offset %jd.\n",
1468 dump_encrypt(struct kerneldumpcrypto *kdc, uint8_t *buf, size_t size)
1471 switch (kdc->kdc_encryption) {
1472 case KERNELDUMP_ENC_AES_256_CBC:
1473 if (rijndael_blockEncrypt(&kdc->kdc_ci, &kdc->kdc_ki, buf,
1474 8 * size, buf) <= 0) {
1477 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC,
1478 buf + size - 16 /* IV size for AES-256-CBC */) <= 0) {
1482 case KERNELDUMP_ENC_CHACHA20:
1483 chacha_encrypt_bytes(&kdc->kdc_chacha, buf, buf, size);
1492 /* Encrypt data and call dumper. */
1494 dump_encrypted_write(struct dumperinfo *di, void *virtual, off_t offset,
1497 static uint8_t buf[KERNELDUMP_BUFFER_SIZE];
1498 struct kerneldumpcrypto *kdc;
1504 while (length > 0) {
1505 nbytes = MIN(length, sizeof(buf));
1506 bcopy(virtual, buf, nbytes);
1508 if (dump_encrypt(kdc, buf, nbytes) != 0)
1511 error = dump_write(di, buf, offset, nbytes);
1516 virtual = (void *)((uint8_t *)virtual + nbytes);
1525 kerneldumpcomp_write_cb(void *base, size_t length, off_t offset, void *arg)
1527 struct dumperinfo *di;
1528 size_t resid, rlength;
1533 if (length % di->blocksize != 0) {
1535 * This must be the final write after flushing the compression
1536 * stream. Write as many full blocks as possible and stash the
1537 * residual data in the dumper's block buffer. It will be
1538 * padded and written in dump_finish().
1540 rlength = rounddown(length, di->blocksize);
1542 error = _dump_append(di, base, rlength);
1546 resid = length - rlength;
1547 memmove(di->blockbuf, (uint8_t *)base + rlength, resid);
1548 bzero((uint8_t *)di->blockbuf + resid, di->blocksize - resid);
1549 di->kdcomp->kdc_resid = resid;
1552 return (_dump_append(di, base, length));
1556 * Write kernel dump headers at the beginning and end of the dump extent.
1557 * Write the kernel dump encryption key after the leading header if we were
1558 * configured to do so.
1561 dump_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh)
1564 struct kerneldumpcrypto *kdc;
1572 hdrsz = sizeof(*kdh);
1573 if (hdrsz > di->blocksize)
1578 keysize = kerneldumpcrypto_dumpkeysize(kdc);
1584 * If the dump device has special handling for headers, let it take care
1585 * of writing them out.
1587 if (di->dumper_hdr != NULL)
1588 return (di->dumper_hdr(di, kdh));
1590 if (hdrsz == di->blocksize)
1594 memset(buf, 0, di->blocksize);
1595 memcpy(buf, kdh, hdrsz);
1598 extent = dtoh64(kdh->dumpextent);
1601 error = dump_write(di, kdc->kdc_dumpkey,
1602 di->mediaoffset + di->mediasize - di->blocksize - extent -
1609 error = dump_write(di, buf,
1610 di->mediaoffset + di->mediasize - 2 * di->blocksize - extent -
1611 keysize, di->blocksize);
1613 error = dump_write(di, buf, di->mediaoffset + di->mediasize -
1614 di->blocksize, di->blocksize);
1619 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This is to
1620 * protect us from metadata and metadata from us.
1622 #define SIZEOF_METADATA (64 * 1024)
1625 * Do some preliminary setup for a kernel dump: initialize state for encryption,
1626 * if requested, and make sure that we have enough space on the dump device.
1628 * We set things up so that the dump ends before the last sector of the dump
1629 * device, at which the trailing header is written.
1631 * +-----------+------+-----+----------------------------+------+
1632 * | | lhdr | key | ... kernel dump ... | thdr |
1633 * +-----------+------+-----+----------------------------+------+
1634 * 1 blk opt <------- dump extent --------> 1 blk
1636 * Dumps written using dump_append() start at the beginning of the extent.
1637 * Uncompressed dumps will use the entire extent, but compressed dumps typically
1638 * will not. The true length of the dump is recorded in the leading and trailing
1639 * headers once the dump has been completed.
1641 * The dump device may provide a callback, in which case it will initialize
1642 * dumpoff and take care of laying out the headers.
1645 dump_start(struct dumperinfo *di, struct kerneldumpheader *kdh)
1648 struct kerneldumpcrypto *kdc;
1651 uint64_t dumpextent, span;
1656 /* Send the key before the dump so a partial dump is still usable. */
1658 error = kerneldumpcrypto_init(kdc);
1661 keysize = kerneldumpcrypto_dumpkeysize(kdc);
1662 key = keysize > 0 ? kdc->kdc_dumpkey : NULL;
1669 if (di->dumper_start != NULL) {
1670 error = di->dumper_start(di, key, keysize);
1672 dumpextent = dtoh64(kdh->dumpextent);
1673 span = SIZEOF_METADATA + dumpextent + 2 * di->blocksize +
1675 if (di->mediasize < span) {
1676 if (di->kdcomp == NULL)
1680 * We don't yet know how much space the compressed dump
1681 * will occupy, so try to use the whole swap partition
1682 * (minus the first 64KB) in the hope that the
1683 * compressed dump will fit. If that doesn't turn out to
1684 * be enough, the bounds checking in dump_write()
1685 * will catch us and cause the dump to fail.
1687 dumpextent = di->mediasize - span + dumpextent;
1688 kdh->dumpextent = htod64(dumpextent);
1692 * The offset at which to begin writing the dump.
1694 di->dumpoff = di->mediaoffset + di->mediasize - di->blocksize -
1697 di->origdumpoff = di->dumpoff;
1702 _dump_append(struct dumperinfo *di, void *virtual, size_t length)
1707 if (di->kdcrypto != NULL)
1708 error = dump_encrypted_write(di, virtual, di->dumpoff, length);
1711 error = dump_write(di, virtual, di->dumpoff, length);
1713 di->dumpoff += length;
1718 * Write to the dump device starting at dumpoff. When compression is enabled,
1719 * writes to the device will be performed using a callback that gets invoked
1720 * when the compression stream's output buffer is full.
1723 dump_append(struct dumperinfo *di, void *virtual, size_t length)
1727 if (di->kdcomp != NULL) {
1728 /* Bounce through a buffer to avoid CRC errors. */
1729 if (length > di->maxiosize)
1731 buf = di->kdcomp->kdc_buf;
1732 memmove(buf, virtual, length);
1733 return (compressor_write(di->kdcomp->kdc_stream, buf, length));
1735 return (_dump_append(di, virtual, length));
1739 * Write to the dump device at the specified offset.
1742 dump_write(struct dumperinfo *di, void *virtual, off_t offset, size_t length)
1746 error = dump_check_bounds(di, offset, length);
1749 return (di->dumper(di->priv, virtual, offset, length));
1753 * Perform kernel dump finalization: flush the compression stream, if necessary,
1754 * write the leading and trailing kernel dump headers now that we know the true
1755 * length of the dump, and optionally write the encryption key following the
1759 dump_finish(struct dumperinfo *di, struct kerneldumpheader *kdh)
1763 if (di->kdcomp != NULL) {
1764 error = compressor_flush(di->kdcomp->kdc_stream);
1765 if (error == EAGAIN) {
1766 /* We have residual data in di->blockbuf. */
1767 error = _dump_append(di, di->blockbuf, di->blocksize);
1769 /* Compensate for _dump_append()'s adjustment. */
1770 di->dumpoff -= di->blocksize - di->kdcomp->kdc_resid;
1771 di->kdcomp->kdc_resid = 0;
1777 * We now know the size of the compressed dump, so update the
1778 * header accordingly and recompute parity.
1780 kdh->dumplength = htod64(di->dumpoff - di->origdumpoff);
1782 kdh->parity = kerneldump_parity(kdh);
1784 compressor_reset(di->kdcomp->kdc_stream);
1787 error = dump_write_headers(di, kdh);
1791 (void)dump_write(di, NULL, 0, 0);
1796 dump_init_header(const struct dumperinfo *di, struct kerneldumpheader *kdh,
1797 const char *magic, uint32_t archver, uint64_t dumplen)
1801 bzero(kdh, sizeof(*kdh));
1802 strlcpy(kdh->magic, magic, sizeof(kdh->magic));
1803 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
1804 kdh->version = htod32(KERNELDUMPVERSION);
1805 kdh->architectureversion = htod32(archver);
1806 kdh->dumplength = htod64(dumplen);
1807 kdh->dumpextent = kdh->dumplength;
1808 kdh->dumptime = htod64(time_second);
1810 kdh->dumpkeysize = htod32(kerneldumpcrypto_dumpkeysize(di->kdcrypto));
1812 kdh->dumpkeysize = 0;
1814 kdh->blocksize = htod32(di->blocksize);
1815 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
1816 dstsize = sizeof(kdh->versionstring);
1817 if (strlcpy(kdh->versionstring, version, dstsize) >= dstsize)
1818 kdh->versionstring[dstsize - 2] = '\n';
1819 if (panicstr != NULL)
1820 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
1821 if (di->kdcomp != NULL)
1822 kdh->compression = di->kdcomp->kdc_format;
1823 kdh->parity = kerneldump_parity(kdh);
1827 DB_SHOW_COMMAND_FLAGS(panic, db_show_panic, DB_CMD_MEMSAFE)
1830 if (panicstr == NULL)
1831 db_printf("panicstr not set\n");
1833 db_printf("panic: %s\n", panicstr);