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.
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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
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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 | CTLFLAG_SECURE,
133 &debugger_on_panic, 0, "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 | CTLFLAG_SECURE,
138 &debugger_on_recursive_panic, 0, "Run debugger on recursive kernel panic");
140 int debugger_on_trap = 0;
141 SYSCTL_INT(_debug, OID_AUTO, debugger_on_trap,
142 CTLFLAG_RWTUN | CTLFLAG_SECURE,
143 &debugger_on_trap, 0, "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. */
248 static 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);
273 EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
274 SHUTDOWN_PRI_LAST + 200);
277 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
280 * The only reason this exists is to create the /dev/reroot/ directory,
281 * used by reroot code in init(8) as a mountpoint for tmpfs.
284 reroot_conf(void *unused)
289 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev,
290 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot");
292 printf("%s: failed to create device node, error %d",
297 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL);
300 * The system call that results in a reboot.
304 sys_reboot(struct thread *td, struct reboot_args *uap)
310 error = mac_system_check_reboot(td->td_ucred, uap->opt);
313 error = priv_check(td, PRIV_REBOOT);
315 if (uap->opt & RB_REROOT)
316 error = kern_reroot();
318 kern_reboot(uap->opt);
324 shutdown_nice_task_fn(void *arg, int pending __unused)
328 howto = (uintptr_t)arg;
329 /* Send a signal to init(8) and have it shutdown the world. */
331 if ((howto & RB_POWEROFF) != 0) {
332 BOOTTRACE("SIGUSR2 to init(8)");
333 kern_psignal(initproc, SIGUSR2);
334 } else if ((howto & RB_POWERCYCLE) != 0) {
335 BOOTTRACE("SIGWINCH to init(8)");
336 kern_psignal(initproc, SIGWINCH);
337 } else if ((howto & RB_HALT) != 0) {
338 BOOTTRACE("SIGUSR1 to init(8)");
339 kern_psignal(initproc, SIGUSR1);
341 BOOTTRACE("SIGINT to init(8)");
342 kern_psignal(initproc, SIGINT);
344 PROC_UNLOCK(initproc);
347 static struct task shutdown_nice_task = TASK_INITIALIZER(0,
348 &shutdown_nice_task_fn, NULL);
351 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
354 shutdown_nice(int howto)
357 if (initproc != NULL && !SCHEDULER_STOPPED()) {
358 BOOTTRACE("shutdown initiated");
359 shutdown_nice_task.ta_context = (void *)(uintptr_t)howto;
360 taskqueue_enqueue(taskqueue_fast, &shutdown_nice_task);
363 * No init(8) running, or scheduler would not allow it
364 * to run, so simply reboot.
366 kern_reboot(howto | RB_NOSYNC);
379 if (ts.tv_sec >= 86400) {
380 printf("%ldd", (long)ts.tv_sec / 86400);
384 if (f || ts.tv_sec >= 3600) {
385 printf("%ldh", (long)ts.tv_sec / 3600);
389 if (f || ts.tv_sec >= 60) {
390 printf("%ldm", (long)ts.tv_sec / 60);
394 printf("%lds\n", (long)ts.tv_sec);
398 * Set up a context that can be extracted from the dump.
405 dumptid = curthread->td_tid;
409 doadump(boolean_t textdump)
417 if (TAILQ_EMPTY(&dumper_configs))
425 if (textdump && textdump_pending) {
427 textdump_dumpsys(TAILQ_FIRST(&dumper_configs));
431 struct dumperinfo *di;
433 TAILQ_FOREACH(di, &dumper_configs, di_next) {
445 * Trace the shutdown reason.
448 reboottrace(int howto)
450 if ((howto & RB_DUMP) != 0) {
451 if ((howto & RB_HALT) != 0)
452 BOOTTRACE("system panic: halting...");
453 if ((howto & RB_POWEROFF) != 0)
454 BOOTTRACE("system panic: powering off...");
455 if ((howto & (RB_HALT|RB_POWEROFF)) == 0)
456 BOOTTRACE("system panic: rebooting...");
458 if ((howto & RB_HALT) != 0)
459 BOOTTRACE("system halting...");
460 if ((howto & RB_POWEROFF) != 0)
461 BOOTTRACE("system powering off...");
462 if ((howto & (RB_HALT|RB_POWEROFF)) == 0)
463 BOOTTRACE("system rebooting...");
468 * kern_reboot(9): Shut down the system cleanly to prepare for reboot, halt, or
472 kern_reboot(int howto)
476 if (initproc != NULL && curproc != initproc)
477 BOOTTRACE("kernel shutdown (dirty) started");
479 BOOTTRACE("kernel shutdown (clean) started");
482 * Normal paths here don't hold Giant, but we can wind up here
483 * unexpectedly with it held. Drop it now so we don't have to
484 * drop and pick it up elsewhere. The paths it is locking will
485 * never be returned to, and it is preferable to preclude
486 * deadlock than to lock against code that won't ever
489 while (mtx_owned(&Giant))
494 * Bind us to the first CPU so that all shutdown code runs there. Some
495 * systems don't shutdown properly (i.e., ACPI power off) if we
496 * run on another processor.
498 if (!SCHEDULER_STOPPED()) {
499 thread_lock(curthread);
500 sched_bind(curthread, CPU_FIRST());
501 thread_unlock(curthread);
502 KASSERT(PCPU_GET(cpuid) == CPU_FIRST(),
503 ("%s: not running on cpu 0", __func__));
506 /* We're in the process of rebooting. */
510 /* We are out of the debugger now. */
514 * Do any callouts that should be done BEFORE syncing the filesystems.
516 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
517 BOOTTRACE("shutdown pre sync complete");
520 * Now sync filesystems
522 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) {
524 BOOTTRACE("bufshutdown begin");
525 bufshutdown(show_busybufs);
526 BOOTTRACE("bufshutdown end");
534 * Ok, now do things that assume all filesystem activity has
537 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
538 BOOTTRACE("shutdown post sync complete");
540 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
543 /* Now that we're going to really halt the system... */
544 BOOTTRACE("shutdown final begin");
547 boottrace_dump_console();
549 EVENTHANDLER_INVOKE(shutdown_final, howto);
551 for(;;) ; /* safety against shutdown_reset not working */
556 * The system call that results in changing the rootfs.
561 struct vnode *oldrootvnode, *vp;
562 struct mount *mp, *devmp;
565 if (curproc != initproc)
569 * Mark the filesystem containing currently-running executable
570 * (the temporary copy of init(8)) busy.
572 vp = curproc->p_textvp;
573 error = vn_lock(vp, LK_SHARED);
577 error = vfs_busy(mp, MBF_NOWAIT);
581 error = vfs_busy(mp, 0);
582 vn_lock(vp, LK_SHARED | LK_RETRY);
588 if (VN_IS_DOOMED(vp)) {
597 * Remove the filesystem containing currently-running executable
598 * from the mount list, to prevent it from being unmounted
599 * by vfs_unmountall(), and to avoid confusing vfs_mountroot().
601 * Also preserve /dev - forcibly unmounting it could cause driver
609 mtx_lock(&mountlist_mtx);
610 TAILQ_REMOVE(&mountlist, mp, mnt_list);
611 TAILQ_REMOVE(&mountlist, devmp, mnt_list);
612 mtx_unlock(&mountlist_mtx);
614 oldrootvnode = rootvnode;
617 * Unmount everything except for the two filesystems preserved above.
622 * Add /dev back; vfs_mountroot() will move it into its new place.
624 mtx_lock(&mountlist_mtx);
625 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list);
626 mtx_unlock(&mountlist_mtx);
631 * Mount the new rootfs.
636 * Update all references to the old rootvnode.
638 mountcheckdirs(oldrootvnode, rootvnode);
641 * Add the temporary filesystem back and unbusy it.
643 mtx_lock(&mountlist_mtx);
644 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
645 mtx_unlock(&mountlist_mtx);
652 * If the shutdown was a clean halt, behave accordingly.
655 shutdown_halt(void *junk, int howto)
658 if (howto & RB_HALT) {
660 printf("The operating system has halted.\n");
661 printf("Please press any key to reboot.\n\n");
663 wdog_kern_pat(WD_TO_NEVER);
666 case -1: /* No console, just die */
676 * Check to see if the system panicked, pause and then reboot
677 * according to the specified delay.
680 shutdown_panic(void *junk, int howto)
684 if (howto & RB_DUMP) {
685 if (panic_reboot_wait_time != 0) {
686 if (panic_reboot_wait_time != -1) {
687 printf("Automatic reboot in %d seconds - "
688 "press a key on the console to abort\n",
689 panic_reboot_wait_time);
690 for (loop = panic_reboot_wait_time * 10;
692 DELAY(1000 * 100); /* 1/10th second */
693 /* Did user type a key? */
694 if (cncheckc() != -1)
700 } else { /* zero time specified - reboot NOW */
703 printf("--> Press a key on the console to reboot,\n");
704 printf("--> or switch off the system now.\n");
710 * Everything done, now reset
713 shutdown_reset(void *junk, int howto)
716 printf("Rebooting...\n");
717 DELAY(reboot_wait_time * 1000000);
720 * Acquiring smp_ipi_mtx here has a double effect:
721 * - it disables interrupts avoiding CPU0 preemption
722 * by fast handlers (thus deadlocking against other CPUs)
723 * - it avoids deadlocks against smp_rendezvous() or, more
724 * generally, threads busy-waiting, with this spinlock held,
725 * and waiting for responses by threads on other CPUs
726 * (ie. smp_tlb_shootdown()).
728 * For the !SMP case it just needs to handle the former problem.
731 mtx_lock_spin(&smp_ipi_mtx);
737 /* NOTREACHED */ /* assuming reset worked */
740 #if defined(WITNESS) || defined(INVARIANT_SUPPORT)
741 static int kassert_warn_only = 0;
743 static int kassert_do_kdb = 0;
746 static int kassert_do_ktr = 0;
748 static int kassert_do_log = 1;
749 static int kassert_log_pps_limit = 4;
750 static int kassert_log_mute_at = 0;
751 static int kassert_log_panic_at = 0;
752 static int kassert_suppress_in_panic = 0;
753 static int kassert_warnings = 0;
755 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
758 #ifdef KASSERT_PANIC_OPTIONAL
759 #define KASSERT_RWTUN CTLFLAG_RWTUN
761 #define KASSERT_RWTUN CTLFLAG_RDTUN
764 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, KASSERT_RWTUN,
765 &kassert_warn_only, 0,
766 "KASSERT triggers a panic (0) or just a warning (1)");
769 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, KASSERT_RWTUN,
770 &kassert_do_kdb, 0, "KASSERT will enter the debugger");
774 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, KASSERT_RWTUN,
776 "KASSERT does a KTR, set this to the KTRMASK you want");
779 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, KASSERT_RWTUN,
781 "If warn_only is enabled, log (1) or do not log (0) assertion violations");
783 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RD | CTLFLAG_STATS,
784 &kassert_warnings, 0, "number of KASSERTs that have been triggered");
786 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, KASSERT_RWTUN,
787 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
789 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, KASSERT_RWTUN,
790 &kassert_log_pps_limit, 0, "limit number of log messages per second");
792 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, KASSERT_RWTUN,
793 &kassert_log_mute_at, 0, "max number of KASSERTS to log");
795 SYSCTL_INT(_debug_kassert, OID_AUTO, suppress_in_panic, KASSERT_RWTUN,
796 &kassert_suppress_in_panic, 0,
797 "KASSERTs will be suppressed while handling a panic");
800 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
802 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
803 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE, NULL, 0,
804 kassert_sysctl_kassert, "I",
805 "set to trigger a test kassert");
808 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
812 error = sysctl_wire_old_buffer(req, sizeof(int));
815 error = sysctl_handle_int(oidp, &i, 0, req);
817 if (error != 0 || req->newptr == NULL)
819 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
823 #ifdef KASSERT_PANIC_OPTIONAL
825 * Called by KASSERT, this decides if we will panic
826 * or if we will log via printf and/or ktr.
829 kassert_panic(const char *fmt, ...)
831 static char buf[256];
835 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
839 * If we are suppressing secondary panics, log the warning but do not
840 * re-enter panic/kdb.
842 if (KERNEL_PANICKED() && kassert_suppress_in_panic) {
843 if (kassert_do_log) {
844 printf("KASSERT failed: %s\n", buf);
846 if (trace_all_panics && trace_on_panic)
854 * panic if we're not just warning, or if we've exceeded
855 * kassert_log_panic_at warnings.
857 if (!kassert_warn_only ||
858 (kassert_log_panic_at > 0 &&
859 kassert_warnings >= kassert_log_panic_at)) {
869 * log if we've not yet met the mute limit.
871 if (kassert_do_log &&
872 (kassert_log_mute_at == 0 ||
873 kassert_warnings < kassert_log_mute_at)) {
874 static struct timeval lasterr;
877 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
878 printf("KASSERT failed: %s\n", buf);
883 if (kassert_do_kdb) {
884 kdb_enter(KDB_WHY_KASSERT, buf);
887 atomic_add_int(&kassert_warnings, 1);
889 #endif /* KASSERT_PANIC_OPTIONAL */
893 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
894 * and then reboots. If we are called twice, then we avoid trying to sync
895 * the disks as this often leads to recursive panics.
898 panic(const char *fmt, ...)
907 vpanic(const char *fmt, va_list ap)
912 struct thread *td = curthread;
913 int bootopt, newpanic;
914 static char buf[256];
920 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from
921 * concurrently entering panic. Only the winner will proceed
924 if (panicstr == NULL && !kdb_active) {
925 other_cpus = all_cpus;
926 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
927 stop_cpus_hard(other_cpus);
932 * Ensure that the scheduler is stopped while panicking, even if panic
933 * has been entered from kdb.
935 td->td_stopsched = 1;
937 bootopt = RB_AUTOBOOT;
939 if (KERNEL_PANICKED())
940 bootopt |= RB_NOSYNC;
949 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
952 printf("panic: %s\n", buf);
959 printf("cpuid = %d\n", PCPU_GET(cpuid));
961 printf("time = %jd\n", (intmax_t )time_second);
963 if ((newpanic || trace_all_panics) && trace_on_panic)
965 if (debugger_on_panic)
966 kdb_enter(KDB_WHY_PANIC, "panic");
967 else if (!newpanic && debugger_on_recursive_panic)
968 kdb_enter(KDB_WHY_PANIC, "re-panic");
970 /*thread_lock(td); */
971 td->td_flags |= TDF_INPANIC;
972 /* thread_unlock(td); */
974 bootopt |= RB_NOSYNC;
975 if (poweroff_on_panic)
976 bootopt |= RB_POWEROFF;
977 if (powercycle_on_panic)
978 bootopt |= RB_POWERCYCLE;
979 kern_reboot(bootopt);
983 * Support for poweroff delay.
985 * Please note that setting this delay too short might power off your machine
986 * before the write cache on your hard disk has been flushed, leading to
987 * soft-updates inconsistencies.
989 #ifndef POWEROFF_DELAY
990 # define POWEROFF_DELAY 5000
992 static int poweroff_delay = POWEROFF_DELAY;
994 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
995 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
998 poweroff_wait(void *junk, int howto)
1001 if ((howto & (RB_POWEROFF | RB_POWERCYCLE)) == 0 || poweroff_delay <= 0)
1003 DELAY(poweroff_delay * 1000);
1007 * Some system processes (e.g. syncer) need to be stopped at appropriate
1008 * points in their main loops prior to a system shutdown, so that they
1009 * won't interfere with the shutdown process (e.g. by holding a disk buf
1010 * to cause sync to fail). For each of these system processes, register
1011 * shutdown_kproc() as a handler for one of shutdown events.
1013 static int kproc_shutdown_wait = 60;
1014 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
1015 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
1018 kproc_shutdown(void *arg, int howto)
1023 if (KERNEL_PANICKED())
1026 p = (struct proc *)arg;
1027 printf("Waiting (max %d seconds) for system process `%s' to stop... ",
1028 kproc_shutdown_wait, p->p_comm);
1029 error = kproc_suspend(p, kproc_shutdown_wait * hz);
1031 if (error == EWOULDBLOCK)
1032 printf("timed out\n");
1038 kthread_shutdown(void *arg, int howto)
1043 if (KERNEL_PANICKED())
1046 td = (struct thread *)arg;
1047 printf("Waiting (max %d seconds) for system thread `%s' to stop... ",
1048 kproc_shutdown_wait, td->td_name);
1049 error = kthread_suspend(td, kproc_shutdown_wait * hz);
1051 if (error == EWOULDBLOCK)
1052 printf("timed out\n");
1058 dumpdevname_sysctl_handler(SYSCTL_HANDLER_ARGS)
1061 struct dumperinfo *di;
1065 error = sysctl_wire_old_buffer(req, 0);
1069 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req);
1071 mtx_lock(&dumpconf_list_lk);
1072 TAILQ_FOREACH(di, &dumper_configs, di_next) {
1073 if (di != TAILQ_FIRST(&dumper_configs))
1074 sbuf_putc(&sb, ',');
1075 sbuf_cat(&sb, di->di_devname);
1077 mtx_unlock(&dumpconf_list_lk);
1079 error = sbuf_finish(&sb);
1083 SYSCTL_PROC(_kern_shutdown, OID_AUTO, dumpdevname,
1084 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, &dumper_configs, 0,
1085 dumpdevname_sysctl_handler, "A",
1086 "Device(s) for kernel dumps");
1088 static int _dump_append(struct dumperinfo *di, void *virtual, size_t length);
1091 static struct kerneldumpcrypto *
1092 kerneldumpcrypto_create(size_t blocksize, uint8_t encryption,
1093 const uint8_t *key, uint32_t encryptedkeysize, const uint8_t *encryptedkey)
1095 struct kerneldumpcrypto *kdc;
1096 struct kerneldumpkey *kdk;
1097 uint32_t dumpkeysize;
1099 dumpkeysize = roundup2(sizeof(*kdk) + encryptedkeysize, blocksize);
1100 kdc = malloc(sizeof(*kdc) + dumpkeysize, M_EKCD, M_WAITOK | M_ZERO);
1102 arc4rand(kdc->kdc_iv, sizeof(kdc->kdc_iv), 0);
1104 kdc->kdc_encryption = encryption;
1105 switch (kdc->kdc_encryption) {
1106 case KERNELDUMP_ENC_AES_256_CBC:
1107 if (rijndael_makeKey(&kdc->kdc_ki, DIR_ENCRYPT, 256, key) <= 0)
1110 case KERNELDUMP_ENC_CHACHA20:
1111 chacha_keysetup(&kdc->kdc_chacha, key, 256);
1117 kdc->kdc_dumpkeysize = dumpkeysize;
1118 kdk = kdc->kdc_dumpkey;
1119 kdk->kdk_encryption = kdc->kdc_encryption;
1120 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv));
1121 kdk->kdk_encryptedkeysize = htod32(encryptedkeysize);
1122 memcpy(kdk->kdk_encryptedkey, encryptedkey, encryptedkeysize);
1131 kerneldumpcrypto_init(struct kerneldumpcrypto *kdc)
1133 uint8_t hash[SHA256_DIGEST_LENGTH];
1135 struct kerneldumpkey *kdk;
1144 * When a user enters ddb it can write a crash dump multiple times.
1145 * Each time it should be encrypted using a different IV.
1148 SHA256_Update(&ctx, kdc->kdc_iv, sizeof(kdc->kdc_iv));
1149 SHA256_Final(hash, &ctx);
1150 bcopy(hash, kdc->kdc_iv, sizeof(kdc->kdc_iv));
1152 switch (kdc->kdc_encryption) {
1153 case KERNELDUMP_ENC_AES_256_CBC:
1154 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC,
1155 kdc->kdc_iv) <= 0) {
1160 case KERNELDUMP_ENC_CHACHA20:
1161 chacha_ivsetup(&kdc->kdc_chacha, kdc->kdc_iv, NULL);
1168 kdk = kdc->kdc_dumpkey;
1169 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv));
1171 explicit_bzero(hash, sizeof(hash));
1176 kerneldumpcrypto_dumpkeysize(const struct kerneldumpcrypto *kdc)
1181 return (kdc->kdc_dumpkeysize);
1185 static struct kerneldumpcomp *
1186 kerneldumpcomp_create(struct dumperinfo *di, uint8_t compression)
1188 struct kerneldumpcomp *kdcomp;
1191 switch (compression) {
1192 case KERNELDUMP_COMP_GZIP:
1193 format = COMPRESS_GZIP;
1195 case KERNELDUMP_COMP_ZSTD:
1196 format = COMPRESS_ZSTD;
1202 kdcomp = malloc(sizeof(*kdcomp), M_DUMPER, M_WAITOK | M_ZERO);
1203 kdcomp->kdc_format = compression;
1204 kdcomp->kdc_stream = compressor_init(kerneldumpcomp_write_cb,
1205 format, di->maxiosize, kerneldump_gzlevel, di);
1206 if (kdcomp->kdc_stream == NULL) {
1207 free(kdcomp, M_DUMPER);
1210 kdcomp->kdc_buf = malloc(di->maxiosize, M_DUMPER, M_WAITOK | M_NODUMP);
1215 kerneldumpcomp_destroy(struct dumperinfo *di)
1217 struct kerneldumpcomp *kdcomp;
1219 kdcomp = di->kdcomp;
1222 compressor_fini(kdcomp->kdc_stream);
1223 zfree(kdcomp->kdc_buf, M_DUMPER);
1224 free(kdcomp, M_DUMPER);
1228 * Free a dumper. Must not be present on global list.
1231 dumper_destroy(struct dumperinfo *di)
1237 zfree(di->blockbuf, M_DUMPER);
1238 kerneldumpcomp_destroy(di);
1240 zfree(di->kdcrypto, M_EKCD);
1242 zfree(di, M_DUMPER);
1246 * Allocate and set up a new dumper from the provided template.
1249 dumper_create(const struct dumperinfo *di_template, const char *devname,
1250 const struct diocskerneldump_arg *kda, struct dumperinfo **dip)
1252 struct dumperinfo *newdi;
1258 /* Allocate a new dumper */
1259 newdi = malloc(sizeof(*newdi) + strlen(devname) + 1, M_DUMPER,
1261 memcpy(newdi, di_template, sizeof(*newdi));
1262 newdi->blockbuf = NULL;
1263 newdi->kdcrypto = NULL;
1264 newdi->kdcomp = NULL;
1265 strcpy(newdi->di_devname, devname);
1267 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) {
1269 newdi->kdcrypto = kerneldumpcrypto_create(newdi->blocksize,
1270 kda->kda_encryption, kda->kda_key,
1271 kda->kda_encryptedkeysize, kda->kda_encryptedkey);
1272 if (newdi->kdcrypto == NULL) {
1281 if (kda->kda_compression != KERNELDUMP_COMP_NONE) {
1284 * We can't support simultaneous unpadded block cipher
1285 * encryption and compression because there is no guarantee the
1286 * length of the compressed result is exactly a multiple of the
1287 * cipher block size.
1289 if (kda->kda_encryption == KERNELDUMP_ENC_AES_256_CBC) {
1294 newdi->kdcomp = kerneldumpcomp_create(newdi,
1295 kda->kda_compression);
1296 if (newdi->kdcomp == NULL) {
1301 newdi->blockbuf = malloc(newdi->blocksize, M_DUMPER, M_WAITOK | M_ZERO);
1306 dumper_destroy(newdi);
1311 * Create a new dumper and register it in the global list.
1314 dumper_insert(const struct dumperinfo *di_template, const char *devname,
1315 const struct diocskerneldump_arg *kda)
1317 struct dumperinfo *newdi, *listdi;
1322 index = kda->kda_index;
1323 MPASS(index != KDA_REMOVE && index != KDA_REMOVE_DEV &&
1324 index != KDA_REMOVE_ALL);
1326 error = priv_check(curthread, PRIV_SETDUMPER);
1330 error = dumper_create(di_template, devname, kda, &newdi);
1334 /* Add the new configuration to the queue */
1335 mtx_lock(&dumpconf_list_lk);
1337 TAILQ_FOREACH(listdi, &dumper_configs, di_next) {
1339 TAILQ_INSERT_BEFORE(listdi, newdi, di_next);
1346 TAILQ_INSERT_TAIL(&dumper_configs, newdi, di_next);
1347 mtx_unlock(&dumpconf_list_lk);
1354 dumper_ddb_insert(struct dumperinfo *newdi)
1356 TAILQ_INSERT_HEAD(&dumper_configs, newdi, di_next);
1360 dumper_ddb_remove(struct dumperinfo *di)
1362 TAILQ_REMOVE(&dumper_configs, di, di_next);
1367 dumper_config_match(const struct dumperinfo *di, const char *devname,
1368 const struct diocskerneldump_arg *kda)
1370 if (kda->kda_index == KDA_REMOVE_ALL)
1373 if (strcmp(di->di_devname, devname) != 0)
1377 * Allow wildcard removal of configs matching a device on g_dev_orphan.
1379 if (kda->kda_index == KDA_REMOVE_DEV)
1382 if (di->kdcomp != NULL) {
1383 if (di->kdcomp->kdc_format != kda->kda_compression)
1385 } else if (kda->kda_compression != KERNELDUMP_COMP_NONE)
1388 if (di->kdcrypto != NULL) {
1389 if (di->kdcrypto->kdc_encryption != kda->kda_encryption)
1392 * Do we care to verify keys match to delete? It seems weird
1393 * to expect multiple fallback dump configurations on the same
1394 * device that only differ in crypto key.
1398 if (kda->kda_encryption != KERNELDUMP_ENC_NONE)
1405 * Remove and free the requested dumper(s) from the global list.
1408 dumper_remove(const char *devname, const struct diocskerneldump_arg *kda)
1410 struct dumperinfo *di, *sdi;
1414 error = priv_check(curthread, PRIV_SETDUMPER);
1419 * Try to find a matching configuration, and kill it.
1421 * NULL 'kda' indicates remove any configuration matching 'devname',
1422 * which may remove multiple configurations in atypical configurations.
1425 mtx_lock(&dumpconf_list_lk);
1426 TAILQ_FOREACH_SAFE(di, &dumper_configs, di_next, sdi) {
1427 if (dumper_config_match(di, devname, kda)) {
1429 TAILQ_REMOVE(&dumper_configs, di, di_next);
1433 mtx_unlock(&dumpconf_list_lk);
1435 /* Only produce ENOENT if a more targeted match didn't match. */
1436 if (!found && kda->kda_index == KDA_REMOVE)
1442 dump_check_bounds(struct dumperinfo *di, off_t offset, size_t length)
1445 if (di->mediasize > 0 && length != 0 && (offset < di->mediaoffset ||
1446 offset - di->mediaoffset + length > di->mediasize)) {
1447 if (di->kdcomp != NULL && offset >= di->mediaoffset) {
1449 "Compressed dump failed to fit in device boundaries.\n");
1453 printf("Attempt to write outside dump device boundaries.\n"
1454 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
1455 (intmax_t)offset, (intmax_t)di->mediaoffset,
1456 (uintmax_t)length, (intmax_t)di->mediasize);
1459 if (length % di->blocksize != 0) {
1460 printf("Attempt to write partial block of length %ju.\n",
1464 if (offset % di->blocksize != 0) {
1465 printf("Attempt to write at unaligned offset %jd.\n",
1475 dump_encrypt(struct kerneldumpcrypto *kdc, uint8_t *buf, size_t size)
1478 switch (kdc->kdc_encryption) {
1479 case KERNELDUMP_ENC_AES_256_CBC:
1480 if (rijndael_blockEncrypt(&kdc->kdc_ci, &kdc->kdc_ki, buf,
1481 8 * size, buf) <= 0) {
1484 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC,
1485 buf + size - 16 /* IV size for AES-256-CBC */) <= 0) {
1489 case KERNELDUMP_ENC_CHACHA20:
1490 chacha_encrypt_bytes(&kdc->kdc_chacha, buf, buf, size);
1499 /* Encrypt data and call dumper. */
1501 dump_encrypted_write(struct dumperinfo *di, void *virtual, off_t offset,
1504 static uint8_t buf[KERNELDUMP_BUFFER_SIZE];
1505 struct kerneldumpcrypto *kdc;
1511 while (length > 0) {
1512 nbytes = MIN(length, sizeof(buf));
1513 bcopy(virtual, buf, nbytes);
1515 if (dump_encrypt(kdc, buf, nbytes) != 0)
1518 error = dump_write(di, buf, offset, nbytes);
1523 virtual = (void *)((uint8_t *)virtual + nbytes);
1532 kerneldumpcomp_write_cb(void *base, size_t length, off_t offset, void *arg)
1534 struct dumperinfo *di;
1535 size_t resid, rlength;
1540 if (length % di->blocksize != 0) {
1542 * This must be the final write after flushing the compression
1543 * stream. Write as many full blocks as possible and stash the
1544 * residual data in the dumper's block buffer. It will be
1545 * padded and written in dump_finish().
1547 rlength = rounddown(length, di->blocksize);
1549 error = _dump_append(di, base, rlength);
1553 resid = length - rlength;
1554 memmove(di->blockbuf, (uint8_t *)base + rlength, resid);
1555 bzero((uint8_t *)di->blockbuf + resid, di->blocksize - resid);
1556 di->kdcomp->kdc_resid = resid;
1559 return (_dump_append(di, base, length));
1563 * Write kernel dump headers at the beginning and end of the dump extent.
1564 * Write the kernel dump encryption key after the leading header if we were
1565 * configured to do so.
1568 dump_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh)
1571 struct kerneldumpcrypto *kdc;
1579 hdrsz = sizeof(*kdh);
1580 if (hdrsz > di->blocksize)
1585 keysize = kerneldumpcrypto_dumpkeysize(kdc);
1591 * If the dump device has special handling for headers, let it take care
1592 * of writing them out.
1594 if (di->dumper_hdr != NULL)
1595 return (di->dumper_hdr(di, kdh));
1597 if (hdrsz == di->blocksize)
1601 memset(buf, 0, di->blocksize);
1602 memcpy(buf, kdh, hdrsz);
1605 extent = dtoh64(kdh->dumpextent);
1608 error = dump_write(di, kdc->kdc_dumpkey,
1609 di->mediaoffset + di->mediasize - di->blocksize - extent -
1616 error = dump_write(di, buf,
1617 di->mediaoffset + di->mediasize - 2 * di->blocksize - extent -
1618 keysize, di->blocksize);
1620 error = dump_write(di, buf, di->mediaoffset + di->mediasize -
1621 di->blocksize, di->blocksize);
1626 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This is to
1627 * protect us from metadata and metadata from us.
1629 #define SIZEOF_METADATA (64 * 1024)
1632 * Do some preliminary setup for a kernel dump: initialize state for encryption,
1633 * if requested, and make sure that we have enough space on the dump device.
1635 * We set things up so that the dump ends before the last sector of the dump
1636 * device, at which the trailing header is written.
1638 * +-----------+------+-----+----------------------------+------+
1639 * | | lhdr | key | ... kernel dump ... | thdr |
1640 * +-----------+------+-----+----------------------------+------+
1641 * 1 blk opt <------- dump extent --------> 1 blk
1643 * Dumps written using dump_append() start at the beginning of the extent.
1644 * Uncompressed dumps will use the entire extent, but compressed dumps typically
1645 * will not. The true length of the dump is recorded in the leading and trailing
1646 * headers once the dump has been completed.
1648 * The dump device may provide a callback, in which case it will initialize
1649 * dumpoff and take care of laying out the headers.
1652 dump_start(struct dumperinfo *di, struct kerneldumpheader *kdh)
1655 struct kerneldumpcrypto *kdc;
1658 uint64_t dumpextent, span;
1663 /* Send the key before the dump so a partial dump is still usable. */
1665 error = kerneldumpcrypto_init(kdc);
1668 keysize = kerneldumpcrypto_dumpkeysize(kdc);
1669 key = keysize > 0 ? kdc->kdc_dumpkey : NULL;
1676 if (di->dumper_start != NULL) {
1677 error = di->dumper_start(di, key, keysize);
1679 dumpextent = dtoh64(kdh->dumpextent);
1680 span = SIZEOF_METADATA + dumpextent + 2 * di->blocksize +
1682 if (di->mediasize < span) {
1683 if (di->kdcomp == NULL)
1687 * We don't yet know how much space the compressed dump
1688 * will occupy, so try to use the whole swap partition
1689 * (minus the first 64KB) in the hope that the
1690 * compressed dump will fit. If that doesn't turn out to
1691 * be enough, the bounds checking in dump_write()
1692 * will catch us and cause the dump to fail.
1694 dumpextent = di->mediasize - span + dumpextent;
1695 kdh->dumpextent = htod64(dumpextent);
1699 * The offset at which to begin writing the dump.
1701 di->dumpoff = di->mediaoffset + di->mediasize - di->blocksize -
1704 di->origdumpoff = di->dumpoff;
1709 _dump_append(struct dumperinfo *di, void *virtual, size_t length)
1714 if (di->kdcrypto != NULL)
1715 error = dump_encrypted_write(di, virtual, di->dumpoff, length);
1718 error = dump_write(di, virtual, di->dumpoff, length);
1720 di->dumpoff += length;
1725 * Write to the dump device starting at dumpoff. When compression is enabled,
1726 * writes to the device will be performed using a callback that gets invoked
1727 * when the compression stream's output buffer is full.
1730 dump_append(struct dumperinfo *di, void *virtual, size_t length)
1734 if (di->kdcomp != NULL) {
1735 /* Bounce through a buffer to avoid CRC errors. */
1736 if (length > di->maxiosize)
1738 buf = di->kdcomp->kdc_buf;
1739 memmove(buf, virtual, length);
1740 return (compressor_write(di->kdcomp->kdc_stream, buf, length));
1742 return (_dump_append(di, virtual, length));
1746 * Write to the dump device at the specified offset.
1749 dump_write(struct dumperinfo *di, void *virtual, off_t offset, size_t length)
1753 error = dump_check_bounds(di, offset, length);
1756 return (di->dumper(di->priv, virtual, offset, length));
1760 * Perform kernel dump finalization: flush the compression stream, if necessary,
1761 * write the leading and trailing kernel dump headers now that we know the true
1762 * length of the dump, and optionally write the encryption key following the
1766 dump_finish(struct dumperinfo *di, struct kerneldumpheader *kdh)
1770 if (di->kdcomp != NULL) {
1771 error = compressor_flush(di->kdcomp->kdc_stream);
1772 if (error == EAGAIN) {
1773 /* We have residual data in di->blockbuf. */
1774 error = _dump_append(di, di->blockbuf, di->blocksize);
1776 /* Compensate for _dump_append()'s adjustment. */
1777 di->dumpoff -= di->blocksize - di->kdcomp->kdc_resid;
1778 di->kdcomp->kdc_resid = 0;
1784 * We now know the size of the compressed dump, so update the
1785 * header accordingly and recompute parity.
1787 kdh->dumplength = htod64(di->dumpoff - di->origdumpoff);
1789 kdh->parity = kerneldump_parity(kdh);
1791 compressor_reset(di->kdcomp->kdc_stream);
1794 error = dump_write_headers(di, kdh);
1798 (void)dump_write(di, NULL, 0, 0);
1803 dump_init_header(const struct dumperinfo *di, struct kerneldumpheader *kdh,
1804 const char *magic, uint32_t archver, uint64_t dumplen)
1808 bzero(kdh, sizeof(*kdh));
1809 strlcpy(kdh->magic, magic, sizeof(kdh->magic));
1810 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
1811 kdh->version = htod32(KERNELDUMPVERSION);
1812 kdh->architectureversion = htod32(archver);
1813 kdh->dumplength = htod64(dumplen);
1814 kdh->dumpextent = kdh->dumplength;
1815 kdh->dumptime = htod64(time_second);
1817 kdh->dumpkeysize = htod32(kerneldumpcrypto_dumpkeysize(di->kdcrypto));
1819 kdh->dumpkeysize = 0;
1821 kdh->blocksize = htod32(di->blocksize);
1822 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
1823 dstsize = sizeof(kdh->versionstring);
1824 if (strlcpy(kdh->versionstring, version, dstsize) >= dstsize)
1825 kdh->versionstring[dstsize - 2] = '\n';
1826 if (panicstr != NULL)
1827 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
1828 if (di->kdcomp != NULL)
1829 kdh->compression = di->kdcomp->kdc_format;
1830 kdh->parity = kerneldump_parity(kdh);
1834 DB_SHOW_COMMAND_FLAGS(panic, db_show_panic, DB_CMD_MEMSAFE)
1837 if (panicstr == NULL)
1838 db_printf("panicstr not set\n");
1840 db_printf("panic: %s\n", panicstr);