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
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
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
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30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include <sys/cdefs.h>
41 #include "opt_panic.h"
42 #include "opt_printf.h"
43 #include "opt_sched.h"
44 #include "opt_watchdog.h"
46 #include <sys/param.h>
47 #include <sys/systm.h>
49 #include <sys/boottrace.h>
52 #include <sys/compressor.h>
55 #include <sys/eventhandler.h>
56 #include <sys/filedesc.h>
59 #include <sys/kernel.h>
60 #include <sys/kerneldump.h>
61 #include <sys/kthread.h>
63 #include <sys/malloc.h>
65 #include <sys/mount.h>
68 #include <sys/reboot.h>
69 #include <sys/resourcevar.h>
70 #include <sys/rwlock.h>
72 #include <sys/sched.h>
74 #include <sys/sysctl.h>
75 #include <sys/sysproto.h>
76 #include <sys/taskqueue.h>
77 #include <sys/vnode.h>
78 #include <sys/watchdog.h>
80 #include <crypto/chacha20/chacha.h>
81 #include <crypto/rijndael/rijndael-api-fst.h>
82 #include <crypto/sha2/sha256.h>
86 #include <machine/cpu.h>
87 #include <machine/dump.h>
88 #include <machine/pcb.h>
89 #include <machine/smp.h>
91 #include <security/mac/mac_framework.h>
94 #include <vm/vm_object.h>
95 #include <vm/vm_page.h>
96 #include <vm/vm_pager.h>
97 #include <vm/swap_pager.h>
99 #include <sys/signalvar.h>
101 static MALLOC_DEFINE(M_DUMPER, "dumper", "dumper block buffer");
103 #ifndef PANIC_REBOOT_WAIT_TIME
104 #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
106 static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME;
107 SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN,
108 &panic_reboot_wait_time, 0,
109 "Seconds to wait before rebooting after a panic");
110 static int reboot_wait_time = 0;
111 SYSCTL_INT(_kern, OID_AUTO, reboot_wait_time, CTLFLAG_RWTUN,
112 &reboot_wait_time, 0,
113 "Seconds to wait before rebooting");
116 * Note that stdarg.h and the ANSI style va_start macro is used for both
117 * ANSI and traditional C compilers.
119 #include <machine/stdarg.h>
122 #ifdef KDB_UNATTENDED
123 int debugger_on_panic = 0;
125 int debugger_on_panic = 1;
127 SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic,
128 CTLFLAG_RWTUN, &debugger_on_panic, 0,
129 "Run debugger on kernel panic");
131 static bool debugger_on_recursive_panic = false;
132 SYSCTL_BOOL(_debug, OID_AUTO, debugger_on_recursive_panic,
133 CTLFLAG_RWTUN, &debugger_on_recursive_panic, 0,
134 "Run debugger on recursive kernel panic");
136 int debugger_on_trap = 0;
137 SYSCTL_INT(_debug, OID_AUTO, debugger_on_trap,
138 CTLFLAG_RWTUN, &debugger_on_trap, 0,
139 "Run debugger on kernel trap before panic");
142 static int trace_on_panic = 1;
143 static bool trace_all_panics = true;
145 static int trace_on_panic = 0;
146 static bool trace_all_panics = false;
148 SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
149 CTLFLAG_RWTUN | CTLFLAG_SECURE,
150 &trace_on_panic, 0, "Print stack trace on kernel panic");
151 SYSCTL_BOOL(_debug, OID_AUTO, trace_all_panics, CTLFLAG_RWTUN,
152 &trace_all_panics, 0, "Print stack traces on secondary kernel panics");
155 static int sync_on_panic = 0;
156 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN,
157 &sync_on_panic, 0, "Do a sync before rebooting from a panic");
159 static bool poweroff_on_panic = 0;
160 SYSCTL_BOOL(_kern, OID_AUTO, poweroff_on_panic, CTLFLAG_RWTUN,
161 &poweroff_on_panic, 0, "Do a power off instead of a reboot on a panic");
163 static bool powercycle_on_panic = 0;
164 SYSCTL_BOOL(_kern, OID_AUTO, powercycle_on_panic, CTLFLAG_RWTUN,
165 &powercycle_on_panic, 0, "Do a power cycle instead of a reboot on a panic");
167 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
168 "Shutdown environment");
171 static int show_busybufs;
173 static int show_busybufs = 1;
175 SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
177 "Show busy buffers during shutdown");
179 int suspend_blocked = 0;
180 SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW,
181 &suspend_blocked, 0, "Block suspend due to a pending shutdown");
184 FEATURE(ekcd, "Encrypted kernel crash dumps support");
186 MALLOC_DEFINE(M_EKCD, "ekcd", "Encrypted kernel crash dumps data");
188 struct kerneldumpcrypto {
189 uint8_t kdc_encryption;
190 uint8_t kdc_iv[KERNELDUMP_IV_MAX_SIZE];
194 cipherInstance aes_ci;
196 struct chacha_ctx u_chacha;
198 #define kdc_ki u.u_aes.aes_ki
199 #define kdc_ci u.u_aes.aes_ci
200 #define kdc_chacha u.u_chacha
201 uint32_t kdc_dumpkeysize;
202 struct kerneldumpkey kdc_dumpkey[];
206 struct kerneldumpcomp {
208 struct compressor *kdc_stream;
213 static struct kerneldumpcomp *kerneldumpcomp_create(struct dumperinfo *di,
214 uint8_t compression);
215 static void kerneldumpcomp_destroy(struct dumperinfo *di);
216 static int kerneldumpcomp_write_cb(void *base, size_t len, off_t off, void *arg);
218 static int kerneldump_gzlevel = 6;
219 SYSCTL_INT(_kern, OID_AUTO, kerneldump_gzlevel, CTLFLAG_RWTUN,
220 &kerneldump_gzlevel, 0,
221 "Kernel crash dump compression level");
224 * Variable panicstr contains argument to first call to panic; used as flag
225 * to indicate that the kernel has already called panic.
227 const char *panicstr;
228 bool __read_frequently panicked;
230 int __read_mostly dumping; /* system is dumping */
231 int rebooting; /* system is rebooting */
233 * Used to serialize between sysctl kern.shutdown.dumpdevname and list
234 * modifications via ioctl.
236 static struct mtx dumpconf_list_lk;
237 MTX_SYSINIT(dumper_configs, &dumpconf_list_lk, "dumper config list", MTX_DEF);
239 /* Our selected dumper(s). */
240 static TAILQ_HEAD(dumpconflist, dumperinfo) dumper_configs =
241 TAILQ_HEAD_INITIALIZER(dumper_configs);
243 /* Context information for dump-debuggers, saved by the dump_savectx() macro. */
244 struct pcb dumppcb; /* Registers. */
245 lwpid_t dumptid; /* Thread ID. */
247 static struct cdevsw reroot_cdevsw = {
248 .d_version = D_VERSION,
252 static void poweroff_wait(void *, int);
253 static void shutdown_halt(void *junk, int howto);
254 static void shutdown_panic(void *junk, int howto);
255 static void shutdown_reset(void *junk, int howto);
256 static int kern_reroot(void);
258 /* register various local shutdown events */
260 shutdown_conf(void *unused)
263 EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
265 EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
266 SHUTDOWN_PRI_LAST + 100);
267 EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
268 SHUTDOWN_PRI_LAST + 100);
271 SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
274 * The only reason this exists is to create the /dev/reroot/ directory,
275 * used by reroot code in init(8) as a mountpoint for tmpfs.
278 reroot_conf(void *unused)
283 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev,
284 &reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot");
286 printf("%s: failed to create device node, error %d",
291 SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL);
294 * The system call that results in a reboot.
298 sys_reboot(struct thread *td, struct reboot_args *uap)
304 error = mac_system_check_reboot(td->td_ucred, uap->opt);
307 error = priv_check(td, PRIV_REBOOT);
309 if (uap->opt & RB_REROOT)
310 error = kern_reroot();
312 kern_reboot(uap->opt);
318 shutdown_nice_task_fn(void *arg, int pending __unused)
322 howto = (uintptr_t)arg;
323 /* Send a signal to init(8) and have it shutdown the world. */
325 if ((howto & RB_POWEROFF) != 0) {
326 BOOTTRACE("SIGUSR2 to init(8)");
327 kern_psignal(initproc, SIGUSR2);
328 } else if ((howto & RB_POWERCYCLE) != 0) {
329 BOOTTRACE("SIGWINCH to init(8)");
330 kern_psignal(initproc, SIGWINCH);
331 } else if ((howto & RB_HALT) != 0) {
332 BOOTTRACE("SIGUSR1 to init(8)");
333 kern_psignal(initproc, SIGUSR1);
335 BOOTTRACE("SIGINT to init(8)");
336 kern_psignal(initproc, SIGINT);
338 PROC_UNLOCK(initproc);
341 static struct task shutdown_nice_task = TASK_INITIALIZER(0,
342 &shutdown_nice_task_fn, NULL);
345 * Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
348 shutdown_nice(int howto)
351 if (initproc != NULL && !SCHEDULER_STOPPED()) {
352 BOOTTRACE("shutdown initiated");
353 shutdown_nice_task.ta_context = (void *)(uintptr_t)howto;
354 taskqueue_enqueue(taskqueue_fast, &shutdown_nice_task);
357 * No init(8) running, or scheduler would not allow it
358 * to run, so simply reboot.
360 kern_reboot(howto | RB_NOSYNC);
373 if (ts.tv_sec >= 86400) {
374 printf("%ldd", (long)ts.tv_sec / 86400);
378 if (f || ts.tv_sec >= 3600) {
379 printf("%ldh", (long)ts.tv_sec / 3600);
383 if (f || ts.tv_sec >= 60) {
384 printf("%ldm", (long)ts.tv_sec / 60);
388 printf("%lds\n", (long)ts.tv_sec);
392 doadump(boolean_t textdump)
400 if (TAILQ_EMPTY(&dumper_configs))
408 if (textdump && textdump_pending) {
410 textdump_dumpsys(TAILQ_FIRST(&dumper_configs));
414 struct dumperinfo *di;
416 TAILQ_FOREACH(di, &dumper_configs, di_next) {
428 * Trace the shutdown reason.
431 reboottrace(int howto)
433 if ((howto & RB_DUMP) != 0) {
434 if ((howto & RB_HALT) != 0)
435 BOOTTRACE("system panic: halting...");
436 if ((howto & RB_POWEROFF) != 0)
437 BOOTTRACE("system panic: powering off...");
438 if ((howto & (RB_HALT|RB_POWEROFF)) == 0)
439 BOOTTRACE("system panic: rebooting...");
441 if ((howto & RB_HALT) != 0)
442 BOOTTRACE("system halting...");
443 if ((howto & RB_POWEROFF) != 0)
444 BOOTTRACE("system powering off...");
445 if ((howto & (RB_HALT|RB_POWEROFF)) == 0)
446 BOOTTRACE("system rebooting...");
451 * kern_reboot(9): Shut down the system cleanly to prepare for reboot, halt, or
455 kern_reboot(int howto)
459 if (initproc != NULL && curproc != initproc)
460 BOOTTRACE("kernel shutdown (dirty) started");
462 BOOTTRACE("kernel shutdown (clean) started");
465 * Normal paths here don't hold Giant, but we can wind up here
466 * unexpectedly with it held. Drop it now so we don't have to
467 * drop and pick it up elsewhere. The paths it is locking will
468 * never be returned to, and it is preferable to preclude
469 * deadlock than to lock against code that won't ever
472 while (!SCHEDULER_STOPPED() && mtx_owned(&Giant))
477 * Bind us to the first CPU so that all shutdown code runs there. Some
478 * systems don't shutdown properly (i.e., ACPI power off) if we
479 * run on another processor.
481 if (!SCHEDULER_STOPPED()) {
482 thread_lock(curthread);
483 sched_bind(curthread, CPU_FIRST());
484 thread_unlock(curthread);
485 KASSERT(PCPU_GET(cpuid) == CPU_FIRST(),
486 ("%s: not running on cpu 0", __func__));
489 /* We're in the process of rebooting. */
494 * Do any callouts that should be done BEFORE syncing the filesystems.
496 EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
497 BOOTTRACE("shutdown pre sync complete");
500 * Now sync filesystems
502 if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) {
504 BOOTTRACE("bufshutdown begin");
505 bufshutdown(show_busybufs);
506 BOOTTRACE("bufshutdown end");
514 * Ok, now do things that assume all filesystem activity has
517 EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
518 BOOTTRACE("shutdown post sync complete");
520 if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
523 /* Now that we're going to really halt the system... */
524 BOOTTRACE("shutdown final begin");
527 boottrace_dump_console();
529 EVENTHANDLER_INVOKE(shutdown_final, howto);
532 * Call this directly so that reset is attempted even if shutdown
533 * handlers are not yet registered.
535 shutdown_reset(NULL, howto);
537 for(;;) ; /* safety against shutdown_reset not working */
542 * The system call that results in changing the rootfs.
547 struct vnode *oldrootvnode, *vp;
548 struct mount *mp, *devmp;
551 if (curproc != initproc)
555 * Mark the filesystem containing currently-running executable
556 * (the temporary copy of init(8)) busy.
558 vp = curproc->p_textvp;
559 error = vn_lock(vp, LK_SHARED);
563 error = vfs_busy(mp, MBF_NOWAIT);
567 error = vfs_busy(mp, 0);
568 vn_lock(vp, LK_SHARED | LK_RETRY);
574 if (VN_IS_DOOMED(vp)) {
583 * Remove the filesystem containing currently-running executable
584 * from the mount list, to prevent it from being unmounted
585 * by vfs_unmountall(), and to avoid confusing vfs_mountroot().
587 * Also preserve /dev - forcibly unmounting it could cause driver
595 mtx_lock(&mountlist_mtx);
596 TAILQ_REMOVE(&mountlist, mp, mnt_list);
597 TAILQ_REMOVE(&mountlist, devmp, mnt_list);
598 mtx_unlock(&mountlist_mtx);
600 oldrootvnode = rootvnode;
603 * Unmount everything except for the two filesystems preserved above.
608 * Add /dev back; vfs_mountroot() will move it into its new place.
610 mtx_lock(&mountlist_mtx);
611 TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list);
612 mtx_unlock(&mountlist_mtx);
617 * Mount the new rootfs.
622 * Update all references to the old rootvnode.
624 mountcheckdirs(oldrootvnode, rootvnode);
627 * Add the temporary filesystem back and unbusy it.
629 mtx_lock(&mountlist_mtx);
630 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
631 mtx_unlock(&mountlist_mtx);
638 * If the shutdown was a clean halt, behave accordingly.
641 shutdown_halt(void *junk, int howto)
644 if (howto & RB_HALT) {
646 printf("The operating system has halted.\n");
647 printf("Please press any key to reboot.\n\n");
649 wdog_kern_pat(WD_TO_NEVER);
652 case -1: /* No console, just die */
662 * Check to see if the system panicked, pause and then reboot
663 * according to the specified delay.
666 shutdown_panic(void *junk, int howto)
670 if (howto & RB_DUMP) {
671 if (panic_reboot_wait_time != 0) {
672 if (panic_reboot_wait_time != -1) {
673 printf("Automatic reboot in %d seconds - "
674 "press a key on the console to abort\n",
675 panic_reboot_wait_time);
676 for (loop = panic_reboot_wait_time * 10;
678 DELAY(1000 * 100); /* 1/10th second */
679 /* Did user type a key? */
680 if (cncheckc() != -1)
686 } else { /* zero time specified - reboot NOW */
689 printf("--> Press a key on the console to reboot,\n");
690 printf("--> or switch off the system now.\n");
696 * Everything done, now reset
699 shutdown_reset(void *junk, int howto)
702 printf("Rebooting...\n");
703 DELAY(reboot_wait_time * 1000000);
706 * Acquiring smp_ipi_mtx here has a double effect:
707 * - it disables interrupts avoiding CPU0 preemption
708 * by fast handlers (thus deadlocking against other CPUs)
709 * - it avoids deadlocks against smp_rendezvous() or, more
710 * generally, threads busy-waiting, with this spinlock held,
711 * and waiting for responses by threads on other CPUs
712 * (ie. smp_tlb_shootdown()).
714 * For the !SMP case it just needs to handle the former problem.
717 mtx_lock_spin(&smp_ipi_mtx);
723 /* NOTREACHED */ /* assuming reset worked */
726 #if defined(WITNESS) || defined(INVARIANT_SUPPORT)
727 static int kassert_warn_only = 0;
729 static int kassert_do_kdb = 0;
732 static int kassert_do_ktr = 0;
734 static int kassert_do_log = 1;
735 static int kassert_log_pps_limit = 4;
736 static int kassert_log_mute_at = 0;
737 static int kassert_log_panic_at = 0;
738 static int kassert_suppress_in_panic = 0;
739 static int kassert_warnings = 0;
741 SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
744 #ifdef KASSERT_PANIC_OPTIONAL
745 #define KASSERT_RWTUN CTLFLAG_RWTUN
747 #define KASSERT_RWTUN CTLFLAG_RDTUN
750 SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, KASSERT_RWTUN,
751 &kassert_warn_only, 0,
752 "KASSERT triggers a panic (0) or just a warning (1)");
755 SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, KASSERT_RWTUN,
756 &kassert_do_kdb, 0, "KASSERT will enter the debugger");
760 SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, KASSERT_RWTUN,
762 "KASSERT does a KTR, set this to the KTRMASK you want");
765 SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, KASSERT_RWTUN,
767 "If warn_only is enabled, log (1) or do not log (0) assertion violations");
769 SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RD | CTLFLAG_STATS,
770 &kassert_warnings, 0, "number of KASSERTs that have been triggered");
772 SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, KASSERT_RWTUN,
773 &kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
775 SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, KASSERT_RWTUN,
776 &kassert_log_pps_limit, 0, "limit number of log messages per second");
778 SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, KASSERT_RWTUN,
779 &kassert_log_mute_at, 0, "max number of KASSERTS to log");
781 SYSCTL_INT(_debug_kassert, OID_AUTO, suppress_in_panic, KASSERT_RWTUN,
782 &kassert_suppress_in_panic, 0,
783 "KASSERTs will be suppressed while handling a panic");
786 static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
788 SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
789 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE, NULL, 0,
790 kassert_sysctl_kassert, "I",
791 "set to trigger a test kassert");
794 kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
798 error = sysctl_wire_old_buffer(req, sizeof(int));
801 error = sysctl_handle_int(oidp, &i, 0, req);
803 if (error != 0 || req->newptr == NULL)
805 KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
809 #ifdef KASSERT_PANIC_OPTIONAL
811 * Called by KASSERT, this decides if we will panic
812 * or if we will log via printf and/or ktr.
815 kassert_panic(const char *fmt, ...)
817 static char buf[256];
821 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
825 * If we are suppressing secondary panics, log the warning but do not
826 * re-enter panic/kdb.
828 if (KERNEL_PANICKED() && kassert_suppress_in_panic) {
829 if (kassert_do_log) {
830 printf("KASSERT failed: %s\n", buf);
832 if (trace_all_panics && trace_on_panic)
840 * panic if we're not just warning, or if we've exceeded
841 * kassert_log_panic_at warnings.
843 if (!kassert_warn_only ||
844 (kassert_log_panic_at > 0 &&
845 kassert_warnings >= kassert_log_panic_at)) {
855 * log if we've not yet met the mute limit.
857 if (kassert_do_log &&
858 (kassert_log_mute_at == 0 ||
859 kassert_warnings < kassert_log_mute_at)) {
860 static struct timeval lasterr;
863 if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
864 printf("KASSERT failed: %s\n", buf);
869 if (kassert_do_kdb) {
870 kdb_enter(KDB_WHY_KASSERT, buf);
873 atomic_add_int(&kassert_warnings, 1);
875 #endif /* KASSERT_PANIC_OPTIONAL */
879 * Panic is called on unresolvable fatal errors. It prints "panic: mesg",
880 * and then reboots. If we are called twice, then we avoid trying to sync
881 * the disks as this often leads to recursive panics.
884 panic(const char *fmt, ...)
893 vpanic(const char *fmt, va_list ap)
898 struct thread *td = curthread;
899 int bootopt, newpanic;
900 static char buf[256];
906 * stop_cpus_hard(other_cpus) should prevent multiple CPUs from
907 * concurrently entering panic. Only the winner will proceed
910 if (panicstr == NULL && !kdb_active) {
911 other_cpus = all_cpus;
912 CPU_CLR(PCPU_GET(cpuid), &other_cpus);
913 stop_cpus_hard(other_cpus);
918 * Ensure that the scheduler is stopped while panicking, even if panic
919 * has been entered from kdb.
921 td->td_stopsched = 1;
923 bootopt = RB_AUTOBOOT;
925 if (KERNEL_PANICKED())
926 bootopt |= RB_NOSYNC;
935 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
938 printf("panic: %s\n", buf);
945 printf("cpuid = %d\n", PCPU_GET(cpuid));
947 printf("time = %jd\n", (intmax_t )time_second);
949 if ((newpanic || trace_all_panics) && trace_on_panic)
951 if (debugger_on_panic)
952 kdb_enter(KDB_WHY_PANIC, "panic");
953 else if (!newpanic && debugger_on_recursive_panic)
954 kdb_enter(KDB_WHY_PANIC, "re-panic");
956 /*thread_lock(td); */
957 td->td_flags |= TDF_INPANIC;
958 /* thread_unlock(td); */
960 bootopt |= RB_NOSYNC;
961 if (poweroff_on_panic)
962 bootopt |= RB_POWEROFF;
963 if (powercycle_on_panic)
964 bootopt |= RB_POWERCYCLE;
965 kern_reboot(bootopt);
969 * Support for poweroff delay.
971 * Please note that setting this delay too short might power off your machine
972 * before the write cache on your hard disk has been flushed, leading to
973 * soft-updates inconsistencies.
975 #ifndef POWEROFF_DELAY
976 # define POWEROFF_DELAY 5000
978 static int poweroff_delay = POWEROFF_DELAY;
980 SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
981 &poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
984 poweroff_wait(void *junk, int howto)
987 if ((howto & (RB_POWEROFF | RB_POWERCYCLE)) == 0 || poweroff_delay <= 0)
989 DELAY(poweroff_delay * 1000);
993 * Some system processes (e.g. syncer) need to be stopped at appropriate
994 * points in their main loops prior to a system shutdown, so that they
995 * won't interfere with the shutdown process (e.g. by holding a disk buf
996 * to cause sync to fail). For each of these system processes, register
997 * shutdown_kproc() as a handler for one of shutdown events.
999 static int kproc_shutdown_wait = 60;
1000 SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
1001 &kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
1004 kproc_shutdown(void *arg, int howto)
1009 if (SCHEDULER_STOPPED())
1012 p = (struct proc *)arg;
1013 printf("Waiting (max %d seconds) for system process `%s' to stop... ",
1014 kproc_shutdown_wait, p->p_comm);
1015 error = kproc_suspend(p, kproc_shutdown_wait * hz);
1017 if (error == EWOULDBLOCK)
1018 printf("timed out\n");
1024 kthread_shutdown(void *arg, int howto)
1029 if (SCHEDULER_STOPPED())
1032 td = (struct thread *)arg;
1033 printf("Waiting (max %d seconds) for system thread `%s' to stop... ",
1034 kproc_shutdown_wait, td->td_name);
1035 error = kthread_suspend(td, kproc_shutdown_wait * hz);
1037 if (error == EWOULDBLOCK)
1038 printf("timed out\n");
1044 dumpdevname_sysctl_handler(SYSCTL_HANDLER_ARGS)
1047 struct dumperinfo *di;
1051 error = sysctl_wire_old_buffer(req, 0);
1055 sbuf_new_for_sysctl(&sb, buf, sizeof(buf), req);
1057 mtx_lock(&dumpconf_list_lk);
1058 TAILQ_FOREACH(di, &dumper_configs, di_next) {
1059 if (di != TAILQ_FIRST(&dumper_configs))
1060 sbuf_putc(&sb, ',');
1061 sbuf_cat(&sb, di->di_devname);
1063 mtx_unlock(&dumpconf_list_lk);
1065 error = sbuf_finish(&sb);
1069 SYSCTL_PROC(_kern_shutdown, OID_AUTO, dumpdevname,
1070 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, &dumper_configs, 0,
1071 dumpdevname_sysctl_handler, "A",
1072 "Device(s) for kernel dumps");
1074 static int _dump_append(struct dumperinfo *di, void *virtual, size_t length);
1077 static struct kerneldumpcrypto *
1078 kerneldumpcrypto_create(size_t blocksize, uint8_t encryption,
1079 const uint8_t *key, uint32_t encryptedkeysize, const uint8_t *encryptedkey)
1081 struct kerneldumpcrypto *kdc;
1082 struct kerneldumpkey *kdk;
1083 uint32_t dumpkeysize;
1085 dumpkeysize = roundup2(sizeof(*kdk) + encryptedkeysize, blocksize);
1086 kdc = malloc(sizeof(*kdc) + dumpkeysize, M_EKCD, M_WAITOK | M_ZERO);
1088 arc4rand(kdc->kdc_iv, sizeof(kdc->kdc_iv), 0);
1090 kdc->kdc_encryption = encryption;
1091 switch (kdc->kdc_encryption) {
1092 case KERNELDUMP_ENC_AES_256_CBC:
1093 if (rijndael_makeKey(&kdc->kdc_ki, DIR_ENCRYPT, 256, key) <= 0)
1096 case KERNELDUMP_ENC_CHACHA20:
1097 chacha_keysetup(&kdc->kdc_chacha, key, 256);
1103 kdc->kdc_dumpkeysize = dumpkeysize;
1104 kdk = kdc->kdc_dumpkey;
1105 kdk->kdk_encryption = kdc->kdc_encryption;
1106 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv));
1107 kdk->kdk_encryptedkeysize = htod32(encryptedkeysize);
1108 memcpy(kdk->kdk_encryptedkey, encryptedkey, encryptedkeysize);
1117 kerneldumpcrypto_init(struct kerneldumpcrypto *kdc)
1119 uint8_t hash[SHA256_DIGEST_LENGTH];
1121 struct kerneldumpkey *kdk;
1130 * When a user enters ddb it can write a crash dump multiple times.
1131 * Each time it should be encrypted using a different IV.
1134 SHA256_Update(&ctx, kdc->kdc_iv, sizeof(kdc->kdc_iv));
1135 SHA256_Final(hash, &ctx);
1136 bcopy(hash, kdc->kdc_iv, sizeof(kdc->kdc_iv));
1138 switch (kdc->kdc_encryption) {
1139 case KERNELDUMP_ENC_AES_256_CBC:
1140 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC,
1141 kdc->kdc_iv) <= 0) {
1146 case KERNELDUMP_ENC_CHACHA20:
1147 chacha_ivsetup(&kdc->kdc_chacha, kdc->kdc_iv, NULL);
1154 kdk = kdc->kdc_dumpkey;
1155 memcpy(kdk->kdk_iv, kdc->kdc_iv, sizeof(kdk->kdk_iv));
1157 explicit_bzero(hash, sizeof(hash));
1162 kerneldumpcrypto_dumpkeysize(const struct kerneldumpcrypto *kdc)
1167 return (kdc->kdc_dumpkeysize);
1171 static struct kerneldumpcomp *
1172 kerneldumpcomp_create(struct dumperinfo *di, uint8_t compression)
1174 struct kerneldumpcomp *kdcomp;
1177 switch (compression) {
1178 case KERNELDUMP_COMP_GZIP:
1179 format = COMPRESS_GZIP;
1181 case KERNELDUMP_COMP_ZSTD:
1182 format = COMPRESS_ZSTD;
1188 kdcomp = malloc(sizeof(*kdcomp), M_DUMPER, M_WAITOK | M_ZERO);
1189 kdcomp->kdc_format = compression;
1190 kdcomp->kdc_stream = compressor_init(kerneldumpcomp_write_cb,
1191 format, di->maxiosize, kerneldump_gzlevel, di);
1192 if (kdcomp->kdc_stream == NULL) {
1193 free(kdcomp, M_DUMPER);
1196 kdcomp->kdc_buf = malloc(di->maxiosize, M_DUMPER, M_WAITOK | M_NODUMP);
1201 kerneldumpcomp_destroy(struct dumperinfo *di)
1203 struct kerneldumpcomp *kdcomp;
1205 kdcomp = di->kdcomp;
1208 compressor_fini(kdcomp->kdc_stream);
1209 zfree(kdcomp->kdc_buf, M_DUMPER);
1210 free(kdcomp, M_DUMPER);
1214 * Free a dumper. Must not be present on global list.
1217 dumper_destroy(struct dumperinfo *di)
1223 zfree(di->blockbuf, M_DUMPER);
1224 kerneldumpcomp_destroy(di);
1226 zfree(di->kdcrypto, M_EKCD);
1228 zfree(di, M_DUMPER);
1232 * Allocate and set up a new dumper from the provided template.
1235 dumper_create(const struct dumperinfo *di_template, const char *devname,
1236 const struct diocskerneldump_arg *kda, struct dumperinfo **dip)
1238 struct dumperinfo *newdi;
1244 /* Allocate a new dumper */
1245 newdi = malloc(sizeof(*newdi) + strlen(devname) + 1, M_DUMPER,
1247 memcpy(newdi, di_template, sizeof(*newdi));
1248 newdi->blockbuf = NULL;
1249 newdi->kdcrypto = NULL;
1250 newdi->kdcomp = NULL;
1251 strcpy(newdi->di_devname, devname);
1253 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) {
1255 newdi->kdcrypto = kerneldumpcrypto_create(newdi->blocksize,
1256 kda->kda_encryption, kda->kda_key,
1257 kda->kda_encryptedkeysize, kda->kda_encryptedkey);
1258 if (newdi->kdcrypto == NULL) {
1267 if (kda->kda_compression != KERNELDUMP_COMP_NONE) {
1270 * We can't support simultaneous unpadded block cipher
1271 * encryption and compression because there is no guarantee the
1272 * length of the compressed result is exactly a multiple of the
1273 * cipher block size.
1275 if (kda->kda_encryption == KERNELDUMP_ENC_AES_256_CBC) {
1280 newdi->kdcomp = kerneldumpcomp_create(newdi,
1281 kda->kda_compression);
1282 if (newdi->kdcomp == NULL) {
1287 newdi->blockbuf = malloc(newdi->blocksize, M_DUMPER, M_WAITOK | M_ZERO);
1292 dumper_destroy(newdi);
1297 * Create a new dumper and register it in the global list.
1300 dumper_insert(const struct dumperinfo *di_template, const char *devname,
1301 const struct diocskerneldump_arg *kda)
1303 struct dumperinfo *newdi, *listdi;
1308 index = kda->kda_index;
1309 MPASS(index != KDA_REMOVE && index != KDA_REMOVE_DEV &&
1310 index != KDA_REMOVE_ALL);
1312 error = priv_check(curthread, PRIV_SETDUMPER);
1316 error = dumper_create(di_template, devname, kda, &newdi);
1320 /* Add the new configuration to the queue */
1321 mtx_lock(&dumpconf_list_lk);
1323 TAILQ_FOREACH(listdi, &dumper_configs, di_next) {
1325 TAILQ_INSERT_BEFORE(listdi, newdi, di_next);
1332 TAILQ_INSERT_TAIL(&dumper_configs, newdi, di_next);
1333 mtx_unlock(&dumpconf_list_lk);
1340 dumper_ddb_insert(struct dumperinfo *newdi)
1342 TAILQ_INSERT_HEAD(&dumper_configs, newdi, di_next);
1346 dumper_ddb_remove(struct dumperinfo *di)
1348 TAILQ_REMOVE(&dumper_configs, di, di_next);
1353 dumper_config_match(const struct dumperinfo *di, const char *devname,
1354 const struct diocskerneldump_arg *kda)
1356 if (kda->kda_index == KDA_REMOVE_ALL)
1359 if (strcmp(di->di_devname, devname) != 0)
1363 * Allow wildcard removal of configs matching a device on g_dev_orphan.
1365 if (kda->kda_index == KDA_REMOVE_DEV)
1368 if (di->kdcomp != NULL) {
1369 if (di->kdcomp->kdc_format != kda->kda_compression)
1371 } else if (kda->kda_compression != KERNELDUMP_COMP_NONE)
1374 if (di->kdcrypto != NULL) {
1375 if (di->kdcrypto->kdc_encryption != kda->kda_encryption)
1378 * Do we care to verify keys match to delete? It seems weird
1379 * to expect multiple fallback dump configurations on the same
1380 * device that only differ in crypto key.
1384 if (kda->kda_encryption != KERNELDUMP_ENC_NONE)
1391 * Remove and free the requested dumper(s) from the global list.
1394 dumper_remove(const char *devname, const struct diocskerneldump_arg *kda)
1396 struct dumperinfo *di, *sdi;
1400 error = priv_check(curthread, PRIV_SETDUMPER);
1405 * Try to find a matching configuration, and kill it.
1407 * NULL 'kda' indicates remove any configuration matching 'devname',
1408 * which may remove multiple configurations in atypical configurations.
1411 mtx_lock(&dumpconf_list_lk);
1412 TAILQ_FOREACH_SAFE(di, &dumper_configs, di_next, sdi) {
1413 if (dumper_config_match(di, devname, kda)) {
1415 TAILQ_REMOVE(&dumper_configs, di, di_next);
1419 mtx_unlock(&dumpconf_list_lk);
1421 /* Only produce ENOENT if a more targeted match didn't match. */
1422 if (!found && kda->kda_index == KDA_REMOVE)
1428 dump_check_bounds(struct dumperinfo *di, off_t offset, size_t length)
1431 if (di->mediasize > 0 && length != 0 && (offset < di->mediaoffset ||
1432 offset - di->mediaoffset + length > di->mediasize)) {
1433 if (di->kdcomp != NULL && offset >= di->mediaoffset) {
1435 "Compressed dump failed to fit in device boundaries.\n");
1439 printf("Attempt to write outside dump device boundaries.\n"
1440 "offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
1441 (intmax_t)offset, (intmax_t)di->mediaoffset,
1442 (uintmax_t)length, (intmax_t)di->mediasize);
1445 if (length % di->blocksize != 0) {
1446 printf("Attempt to write partial block of length %ju.\n",
1450 if (offset % di->blocksize != 0) {
1451 printf("Attempt to write at unaligned offset %jd.\n",
1461 dump_encrypt(struct kerneldumpcrypto *kdc, uint8_t *buf, size_t size)
1464 switch (kdc->kdc_encryption) {
1465 case KERNELDUMP_ENC_AES_256_CBC:
1466 if (rijndael_blockEncrypt(&kdc->kdc_ci, &kdc->kdc_ki, buf,
1467 8 * size, buf) <= 0) {
1470 if (rijndael_cipherInit(&kdc->kdc_ci, MODE_CBC,
1471 buf + size - 16 /* IV size for AES-256-CBC */) <= 0) {
1475 case KERNELDUMP_ENC_CHACHA20:
1476 chacha_encrypt_bytes(&kdc->kdc_chacha, buf, buf, size);
1485 /* Encrypt data and call dumper. */
1487 dump_encrypted_write(struct dumperinfo *di, void *virtual, off_t offset,
1490 static uint8_t buf[KERNELDUMP_BUFFER_SIZE];
1491 struct kerneldumpcrypto *kdc;
1497 while (length > 0) {
1498 nbytes = MIN(length, sizeof(buf));
1499 bcopy(virtual, buf, nbytes);
1501 if (dump_encrypt(kdc, buf, nbytes) != 0)
1504 error = dump_write(di, buf, offset, nbytes);
1509 virtual = (void *)((uint8_t *)virtual + nbytes);
1518 kerneldumpcomp_write_cb(void *base, size_t length, off_t offset, void *arg)
1520 struct dumperinfo *di;
1521 size_t resid, rlength;
1526 if (length % di->blocksize != 0) {
1528 * This must be the final write after flushing the compression
1529 * stream. Write as many full blocks as possible and stash the
1530 * residual data in the dumper's block buffer. It will be
1531 * padded and written in dump_finish().
1533 rlength = rounddown(length, di->blocksize);
1535 error = _dump_append(di, base, rlength);
1539 resid = length - rlength;
1540 memmove(di->blockbuf, (uint8_t *)base + rlength, resid);
1541 bzero((uint8_t *)di->blockbuf + resid, di->blocksize - resid);
1542 di->kdcomp->kdc_resid = resid;
1545 return (_dump_append(di, base, length));
1549 * Write kernel dump headers at the beginning and end of the dump extent.
1550 * Write the kernel dump encryption key after the leading header if we were
1551 * configured to do so.
1554 dump_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh)
1557 struct kerneldumpcrypto *kdc;
1565 hdrsz = sizeof(*kdh);
1566 if (hdrsz > di->blocksize)
1571 keysize = kerneldumpcrypto_dumpkeysize(kdc);
1577 * If the dump device has special handling for headers, let it take care
1578 * of writing them out.
1580 if (di->dumper_hdr != NULL)
1581 return (di->dumper_hdr(di, kdh));
1583 if (hdrsz == di->blocksize)
1587 memset(buf, 0, di->blocksize);
1588 memcpy(buf, kdh, hdrsz);
1591 extent = dtoh64(kdh->dumpextent);
1594 error = dump_write(di, kdc->kdc_dumpkey,
1595 di->mediaoffset + di->mediasize - di->blocksize - extent -
1602 error = dump_write(di, buf,
1603 di->mediaoffset + di->mediasize - 2 * di->blocksize - extent -
1604 keysize, di->blocksize);
1606 error = dump_write(di, buf, di->mediaoffset + di->mediasize -
1607 di->blocksize, di->blocksize);
1612 * Don't touch the first SIZEOF_METADATA bytes on the dump device. This is to
1613 * protect us from metadata and metadata from us.
1615 #define SIZEOF_METADATA (64 * 1024)
1618 * Do some preliminary setup for a kernel dump: initialize state for encryption,
1619 * if requested, and make sure that we have enough space on the dump device.
1621 * We set things up so that the dump ends before the last sector of the dump
1622 * device, at which the trailing header is written.
1624 * +-----------+------+-----+----------------------------+------+
1625 * | | lhdr | key | ... kernel dump ... | thdr |
1626 * +-----------+------+-----+----------------------------+------+
1627 * 1 blk opt <------- dump extent --------> 1 blk
1629 * Dumps written using dump_append() start at the beginning of the extent.
1630 * Uncompressed dumps will use the entire extent, but compressed dumps typically
1631 * will not. The true length of the dump is recorded in the leading and trailing
1632 * headers once the dump has been completed.
1634 * The dump device may provide a callback, in which case it will initialize
1635 * dumpoff and take care of laying out the headers.
1638 dump_start(struct dumperinfo *di, struct kerneldumpheader *kdh)
1641 struct kerneldumpcrypto *kdc;
1644 uint64_t dumpextent, span;
1649 /* Send the key before the dump so a partial dump is still usable. */
1651 error = kerneldumpcrypto_init(kdc);
1654 keysize = kerneldumpcrypto_dumpkeysize(kdc);
1655 key = keysize > 0 ? kdc->kdc_dumpkey : NULL;
1662 if (di->dumper_start != NULL) {
1663 error = di->dumper_start(di, key, keysize);
1665 dumpextent = dtoh64(kdh->dumpextent);
1666 span = SIZEOF_METADATA + dumpextent + 2 * di->blocksize +
1668 if (di->mediasize < span) {
1669 if (di->kdcomp == NULL)
1673 * We don't yet know how much space the compressed dump
1674 * will occupy, so try to use the whole swap partition
1675 * (minus the first 64KB) in the hope that the
1676 * compressed dump will fit. If that doesn't turn out to
1677 * be enough, the bounds checking in dump_write()
1678 * will catch us and cause the dump to fail.
1680 dumpextent = di->mediasize - span + dumpextent;
1681 kdh->dumpextent = htod64(dumpextent);
1685 * The offset at which to begin writing the dump.
1687 di->dumpoff = di->mediaoffset + di->mediasize - di->blocksize -
1690 di->origdumpoff = di->dumpoff;
1695 _dump_append(struct dumperinfo *di, void *virtual, size_t length)
1700 if (di->kdcrypto != NULL)
1701 error = dump_encrypted_write(di, virtual, di->dumpoff, length);
1704 error = dump_write(di, virtual, di->dumpoff, length);
1706 di->dumpoff += length;
1711 * Write to the dump device starting at dumpoff. When compression is enabled,
1712 * writes to the device will be performed using a callback that gets invoked
1713 * when the compression stream's output buffer is full.
1716 dump_append(struct dumperinfo *di, void *virtual, size_t length)
1720 if (di->kdcomp != NULL) {
1721 /* Bounce through a buffer to avoid CRC errors. */
1722 if (length > di->maxiosize)
1724 buf = di->kdcomp->kdc_buf;
1725 memmove(buf, virtual, length);
1726 return (compressor_write(di->kdcomp->kdc_stream, buf, length));
1728 return (_dump_append(di, virtual, length));
1732 * Write to the dump device at the specified offset.
1735 dump_write(struct dumperinfo *di, void *virtual, off_t offset, size_t length)
1739 error = dump_check_bounds(di, offset, length);
1742 return (di->dumper(di->priv, virtual, offset, length));
1746 * Perform kernel dump finalization: flush the compression stream, if necessary,
1747 * write the leading and trailing kernel dump headers now that we know the true
1748 * length of the dump, and optionally write the encryption key following the
1752 dump_finish(struct dumperinfo *di, struct kerneldumpheader *kdh)
1756 if (di->kdcomp != NULL) {
1757 error = compressor_flush(di->kdcomp->kdc_stream);
1758 if (error == EAGAIN) {
1759 /* We have residual data in di->blockbuf. */
1760 error = _dump_append(di, di->blockbuf, di->blocksize);
1762 /* Compensate for _dump_append()'s adjustment. */
1763 di->dumpoff -= di->blocksize - di->kdcomp->kdc_resid;
1764 di->kdcomp->kdc_resid = 0;
1770 * We now know the size of the compressed dump, so update the
1771 * header accordingly and recompute parity.
1773 kdh->dumplength = htod64(di->dumpoff - di->origdumpoff);
1775 kdh->parity = kerneldump_parity(kdh);
1777 compressor_reset(di->kdcomp->kdc_stream);
1780 error = dump_write_headers(di, kdh);
1784 (void)dump_write(di, NULL, 0, 0);
1789 dump_init_header(const struct dumperinfo *di, struct kerneldumpheader *kdh,
1790 const char *magic, uint32_t archver, uint64_t dumplen)
1794 bzero(kdh, sizeof(*kdh));
1795 strlcpy(kdh->magic, magic, sizeof(kdh->magic));
1796 strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
1797 kdh->version = htod32(KERNELDUMPVERSION);
1798 kdh->architectureversion = htod32(archver);
1799 kdh->dumplength = htod64(dumplen);
1800 kdh->dumpextent = kdh->dumplength;
1801 kdh->dumptime = htod64(time_second);
1803 kdh->dumpkeysize = htod32(kerneldumpcrypto_dumpkeysize(di->kdcrypto));
1805 kdh->dumpkeysize = 0;
1807 kdh->blocksize = htod32(di->blocksize);
1808 strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
1809 dstsize = sizeof(kdh->versionstring);
1810 if (strlcpy(kdh->versionstring, version, dstsize) >= dstsize)
1811 kdh->versionstring[dstsize - 2] = '\n';
1812 if (panicstr != NULL)
1813 strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
1814 if (di->kdcomp != NULL)
1815 kdh->compression = di->kdcomp->kdc_format;
1816 kdh->parity = kerneldump_parity(kdh);
1820 DB_SHOW_COMMAND_FLAGS(panic, db_show_panic, DB_CMD_MEMSAFE)
1823 if (panicstr == NULL)
1824 db_printf("panicstr not set\n");
1826 db_printf("panic: %s\n", panicstr);