mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
2eb0015ab7
to shut down; close laptop lid" scenario which otherwise tended to end with a laptop overheating or the battery dying. The implementation uses a new sysctl, kern.suspend_blocked; init(8) sets this while rc.suspend runs, and the ACPI sleep code ignores requests while the sysctl is set. Discussed on: freebsd-acpi (35 emails) MFC after: 1 week
902 lines
22 KiB
C
902 lines
22 KiB
C
/*-
|
|
* Copyright (c) 1986, 1988, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_ddb.h"
|
|
#include "opt_kdb.h"
|
|
#include "opt_panic.h"
|
|
#include "opt_sched.h"
|
|
#include "opt_watchdog.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/cons.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/kdb.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/kerneldump.h>
|
|
#include <sys/kthread.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/rwlock.h>
|
|
#include <sys/sched.h>
|
|
#include <sys/smp.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/watchdog.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/dump.h>
|
|
#include <machine/pcb.h>
|
|
#include <machine/smp.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/swap_pager.h>
|
|
|
|
#include <sys/signalvar.h>
|
|
|
|
#ifndef PANIC_REBOOT_WAIT_TIME
|
|
#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
|
|
#endif
|
|
static int panic_reboot_wait_time = PANIC_REBOOT_WAIT_TIME;
|
|
SYSCTL_INT(_kern, OID_AUTO, panic_reboot_wait_time, CTLFLAG_RWTUN,
|
|
&panic_reboot_wait_time, 0,
|
|
"Seconds to wait before rebooting after a panic");
|
|
|
|
/*
|
|
* Note that stdarg.h and the ANSI style va_start macro is used for both
|
|
* ANSI and traditional C compilers.
|
|
*/
|
|
#include <machine/stdarg.h>
|
|
|
|
#ifdef KDB
|
|
#ifdef KDB_UNATTENDED
|
|
int debugger_on_panic = 0;
|
|
#else
|
|
int debugger_on_panic = 1;
|
|
#endif
|
|
SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic,
|
|
CTLFLAG_RWTUN | CTLFLAG_SECURE,
|
|
&debugger_on_panic, 0, "Run debugger on kernel panic");
|
|
|
|
#ifdef KDB_TRACE
|
|
static int trace_on_panic = 1;
|
|
#else
|
|
static int trace_on_panic = 0;
|
|
#endif
|
|
SYSCTL_INT(_debug, OID_AUTO, trace_on_panic,
|
|
CTLFLAG_RWTUN | CTLFLAG_SECURE,
|
|
&trace_on_panic, 0, "Print stack trace on kernel panic");
|
|
#endif /* KDB */
|
|
|
|
static int sync_on_panic = 0;
|
|
SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN,
|
|
&sync_on_panic, 0, "Do a sync before rebooting from a panic");
|
|
|
|
static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0,
|
|
"Shutdown environment");
|
|
|
|
#ifndef DIAGNOSTIC
|
|
static int show_busybufs;
|
|
#else
|
|
static int show_busybufs = 1;
|
|
#endif
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, show_busybufs, CTLFLAG_RW,
|
|
&show_busybufs, 0, "");
|
|
|
|
int suspend_blocked = 0;
|
|
SYSCTL_INT(_kern, OID_AUTO, suspend_blocked, CTLFLAG_RW,
|
|
&suspend_blocked, 0, "Block suspend due to a pending shutdown");
|
|
|
|
/*
|
|
* Variable panicstr contains argument to first call to panic; used as flag
|
|
* to indicate that the kernel has already called panic.
|
|
*/
|
|
const char *panicstr;
|
|
|
|
int dumping; /* system is dumping */
|
|
int rebooting; /* system is rebooting */
|
|
static struct dumperinfo dumper; /* our selected dumper */
|
|
|
|
/* Context information for dump-debuggers. */
|
|
static struct pcb dumppcb; /* Registers. */
|
|
lwpid_t dumptid; /* Thread ID. */
|
|
|
|
static struct cdevsw reroot_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_name = "reroot",
|
|
};
|
|
|
|
static void poweroff_wait(void *, int);
|
|
static void shutdown_halt(void *junk, int howto);
|
|
static void shutdown_panic(void *junk, int howto);
|
|
static void shutdown_reset(void *junk, int howto);
|
|
static int kern_reroot(void);
|
|
|
|
/* register various local shutdown events */
|
|
static void
|
|
shutdown_conf(void *unused)
|
|
{
|
|
|
|
EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL,
|
|
SHUTDOWN_PRI_FIRST);
|
|
EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL,
|
|
SHUTDOWN_PRI_LAST + 100);
|
|
EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL,
|
|
SHUTDOWN_PRI_LAST + 100);
|
|
EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL,
|
|
SHUTDOWN_PRI_LAST + 200);
|
|
}
|
|
|
|
SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL);
|
|
|
|
/*
|
|
* The only reason this exists is to create the /dev/reroot/ directory,
|
|
* used by reroot code in init(8) as a mountpoint for tmpfs.
|
|
*/
|
|
static void
|
|
reroot_conf(void *unused)
|
|
{
|
|
int error;
|
|
struct cdev *cdev;
|
|
|
|
error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &cdev,
|
|
&reroot_cdevsw, NULL, UID_ROOT, GID_WHEEL, 0600, "reroot/reroot");
|
|
if (error != 0) {
|
|
printf("%s: failed to create device node, error %d",
|
|
__func__, error);
|
|
}
|
|
}
|
|
|
|
SYSINIT(reroot_conf, SI_SUB_DEVFS, SI_ORDER_ANY, reroot_conf, NULL);
|
|
|
|
/*
|
|
* The system call that results in a reboot.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
sys_reboot(struct thread *td, struct reboot_args *uap)
|
|
{
|
|
int error;
|
|
|
|
error = 0;
|
|
#ifdef MAC
|
|
error = mac_system_check_reboot(td->td_ucred, uap->opt);
|
|
#endif
|
|
if (error == 0)
|
|
error = priv_check(td, PRIV_REBOOT);
|
|
if (error == 0) {
|
|
if (uap->opt & RB_REROOT) {
|
|
error = kern_reroot();
|
|
} else {
|
|
mtx_lock(&Giant);
|
|
kern_reboot(uap->opt);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
|
|
*/
|
|
void
|
|
shutdown_nice(int howto)
|
|
{
|
|
|
|
if (initproc != NULL) {
|
|
/* Send a signal to init(8) and have it shutdown the world. */
|
|
PROC_LOCK(initproc);
|
|
if (howto & RB_POWEROFF)
|
|
kern_psignal(initproc, SIGUSR2);
|
|
else if (howto & RB_HALT)
|
|
kern_psignal(initproc, SIGUSR1);
|
|
else
|
|
kern_psignal(initproc, SIGINT);
|
|
PROC_UNLOCK(initproc);
|
|
} else {
|
|
/* No init(8) running, so simply reboot. */
|
|
kern_reboot(howto | RB_NOSYNC);
|
|
}
|
|
}
|
|
|
|
static void
|
|
print_uptime(void)
|
|
{
|
|
int f;
|
|
struct timespec ts;
|
|
|
|
getnanouptime(&ts);
|
|
printf("Uptime: ");
|
|
f = 0;
|
|
if (ts.tv_sec >= 86400) {
|
|
printf("%ldd", (long)ts.tv_sec / 86400);
|
|
ts.tv_sec %= 86400;
|
|
f = 1;
|
|
}
|
|
if (f || ts.tv_sec >= 3600) {
|
|
printf("%ldh", (long)ts.tv_sec / 3600);
|
|
ts.tv_sec %= 3600;
|
|
f = 1;
|
|
}
|
|
if (f || ts.tv_sec >= 60) {
|
|
printf("%ldm", (long)ts.tv_sec / 60);
|
|
ts.tv_sec %= 60;
|
|
f = 1;
|
|
}
|
|
printf("%lds\n", (long)ts.tv_sec);
|
|
}
|
|
|
|
int
|
|
doadump(boolean_t textdump)
|
|
{
|
|
boolean_t coredump;
|
|
int error;
|
|
|
|
error = 0;
|
|
if (dumping)
|
|
return (EBUSY);
|
|
if (dumper.dumper == NULL)
|
|
return (ENXIO);
|
|
|
|
savectx(&dumppcb);
|
|
dumptid = curthread->td_tid;
|
|
dumping++;
|
|
|
|
coredump = TRUE;
|
|
#ifdef DDB
|
|
if (textdump && textdump_pending) {
|
|
coredump = FALSE;
|
|
textdump_dumpsys(&dumper);
|
|
}
|
|
#endif
|
|
if (coredump)
|
|
error = dumpsys(&dumper);
|
|
|
|
dumping--;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Shutdown the system cleanly to prepare for reboot, halt, or power off.
|
|
*/
|
|
void
|
|
kern_reboot(int howto)
|
|
{
|
|
static int once = 0;
|
|
|
|
#if defined(SMP)
|
|
/*
|
|
* Bind us to CPU 0 so that all shutdown code runs there. Some
|
|
* systems don't shutdown properly (i.e., ACPI power off) if we
|
|
* run on another processor.
|
|
*/
|
|
if (!SCHEDULER_STOPPED()) {
|
|
thread_lock(curthread);
|
|
sched_bind(curthread, 0);
|
|
thread_unlock(curthread);
|
|
KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
|
|
}
|
|
#endif
|
|
/* We're in the process of rebooting. */
|
|
rebooting = 1;
|
|
|
|
/* We are out of the debugger now. */
|
|
kdb_active = 0;
|
|
|
|
/*
|
|
* Do any callouts that should be done BEFORE syncing the filesystems.
|
|
*/
|
|
EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
|
|
|
|
/*
|
|
* Now sync filesystems
|
|
*/
|
|
if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) {
|
|
once = 1;
|
|
bufshutdown(show_busybufs);
|
|
}
|
|
|
|
print_uptime();
|
|
|
|
cngrab();
|
|
|
|
/*
|
|
* Ok, now do things that assume all filesystem activity has
|
|
* been completed.
|
|
*/
|
|
EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
|
|
|
|
if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping)
|
|
doadump(TRUE);
|
|
|
|
/* Now that we're going to really halt the system... */
|
|
EVENTHANDLER_INVOKE(shutdown_final, howto);
|
|
|
|
for(;;) ; /* safety against shutdown_reset not working */
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* The system call that results in changing the rootfs.
|
|
*/
|
|
static int
|
|
kern_reroot(void)
|
|
{
|
|
struct vnode *oldrootvnode, *vp;
|
|
struct mount *mp, *devmp;
|
|
int error;
|
|
|
|
if (curproc != initproc)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* Mark the filesystem containing currently-running executable
|
|
* (the temporary copy of init(8)) busy.
|
|
*/
|
|
vp = curproc->p_textvp;
|
|
error = vn_lock(vp, LK_SHARED);
|
|
if (error != 0)
|
|
return (error);
|
|
mp = vp->v_mount;
|
|
error = vfs_busy(mp, MBF_NOWAIT);
|
|
if (error != 0) {
|
|
vfs_ref(mp);
|
|
VOP_UNLOCK(vp, 0);
|
|
error = vfs_busy(mp, 0);
|
|
vn_lock(vp, LK_SHARED | LK_RETRY);
|
|
vfs_rel(mp);
|
|
if (error != 0) {
|
|
VOP_UNLOCK(vp, 0);
|
|
return (ENOENT);
|
|
}
|
|
if (vp->v_iflag & VI_DOOMED) {
|
|
VOP_UNLOCK(vp, 0);
|
|
vfs_unbusy(mp);
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
VOP_UNLOCK(vp, 0);
|
|
|
|
/*
|
|
* Remove the filesystem containing currently-running executable
|
|
* from the mount list, to prevent it from being unmounted
|
|
* by vfs_unmountall(), and to avoid confusing vfs_mountroot().
|
|
*
|
|
* Also preserve /dev - forcibly unmounting it could cause driver
|
|
* reinitialization.
|
|
*/
|
|
|
|
vfs_ref(rootdevmp);
|
|
devmp = rootdevmp;
|
|
rootdevmp = NULL;
|
|
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_REMOVE(&mountlist, mp, mnt_list);
|
|
TAILQ_REMOVE(&mountlist, devmp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
|
|
oldrootvnode = rootvnode;
|
|
|
|
/*
|
|
* Unmount everything except for the two filesystems preserved above.
|
|
*/
|
|
vfs_unmountall();
|
|
|
|
/*
|
|
* Add /dev back; vfs_mountroot() will move it into its new place.
|
|
*/
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_HEAD(&mountlist, devmp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
rootdevmp = devmp;
|
|
vfs_rel(rootdevmp);
|
|
|
|
/*
|
|
* Mount the new rootfs.
|
|
*/
|
|
vfs_mountroot();
|
|
|
|
/*
|
|
* Update all references to the old rootvnode.
|
|
*/
|
|
mountcheckdirs(oldrootvnode, rootvnode);
|
|
|
|
/*
|
|
* Add the temporary filesystem back and unbusy it.
|
|
*/
|
|
mtx_lock(&mountlist_mtx);
|
|
TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
|
|
mtx_unlock(&mountlist_mtx);
|
|
vfs_unbusy(mp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* If the shutdown was a clean halt, behave accordingly.
|
|
*/
|
|
static void
|
|
shutdown_halt(void *junk, int howto)
|
|
{
|
|
|
|
if (howto & RB_HALT) {
|
|
printf("\n");
|
|
printf("The operating system has halted.\n");
|
|
printf("Please press any key to reboot.\n\n");
|
|
switch (cngetc()) {
|
|
case -1: /* No console, just die */
|
|
cpu_halt();
|
|
/* NOTREACHED */
|
|
default:
|
|
howto &= ~RB_HALT;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see if the system paniced, pause and then reboot
|
|
* according to the specified delay.
|
|
*/
|
|
static void
|
|
shutdown_panic(void *junk, int howto)
|
|
{
|
|
int loop;
|
|
|
|
if (howto & RB_DUMP) {
|
|
if (panic_reboot_wait_time != 0) {
|
|
if (panic_reboot_wait_time != -1) {
|
|
printf("Automatic reboot in %d seconds - "
|
|
"press a key on the console to abort\n",
|
|
panic_reboot_wait_time);
|
|
for (loop = panic_reboot_wait_time * 10;
|
|
loop > 0; --loop) {
|
|
DELAY(1000 * 100); /* 1/10th second */
|
|
/* Did user type a key? */
|
|
if (cncheckc() != -1)
|
|
break;
|
|
}
|
|
if (!loop)
|
|
return;
|
|
}
|
|
} else { /* zero time specified - reboot NOW */
|
|
return;
|
|
}
|
|
printf("--> Press a key on the console to reboot,\n");
|
|
printf("--> or switch off the system now.\n");
|
|
cngetc();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Everything done, now reset
|
|
*/
|
|
static void
|
|
shutdown_reset(void *junk, int howto)
|
|
{
|
|
|
|
printf("Rebooting...\n");
|
|
DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
|
|
|
|
/*
|
|
* Acquiring smp_ipi_mtx here has a double effect:
|
|
* - it disables interrupts avoiding CPU0 preemption
|
|
* by fast handlers (thus deadlocking against other CPUs)
|
|
* - it avoids deadlocks against smp_rendezvous() or, more
|
|
* generally, threads busy-waiting, with this spinlock held,
|
|
* and waiting for responses by threads on other CPUs
|
|
* (ie. smp_tlb_shootdown()).
|
|
*
|
|
* For the !SMP case it just needs to handle the former problem.
|
|
*/
|
|
#ifdef SMP
|
|
mtx_lock_spin(&smp_ipi_mtx);
|
|
#else
|
|
spinlock_enter();
|
|
#endif
|
|
|
|
/* cpu_boot(howto); */ /* doesn't do anything at the moment */
|
|
cpu_reset();
|
|
/* NOTREACHED */ /* assuming reset worked */
|
|
}
|
|
|
|
#if defined(WITNESS) || defined(INVARIANTS)
|
|
static int kassert_warn_only = 0;
|
|
#ifdef KDB
|
|
static int kassert_do_kdb = 0;
|
|
#endif
|
|
#ifdef KTR
|
|
static int kassert_do_ktr = 0;
|
|
#endif
|
|
static int kassert_do_log = 1;
|
|
static int kassert_log_pps_limit = 4;
|
|
static int kassert_log_mute_at = 0;
|
|
static int kassert_log_panic_at = 0;
|
|
static int kassert_warnings = 0;
|
|
|
|
SYSCTL_NODE(_debug, OID_AUTO, kassert, CTLFLAG_RW, NULL, "kassert options");
|
|
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, warn_only, CTLFLAG_RWTUN,
|
|
&kassert_warn_only, 0,
|
|
"KASSERT triggers a panic (1) or just a warning (0)");
|
|
|
|
#ifdef KDB
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, do_kdb, CTLFLAG_RWTUN,
|
|
&kassert_do_kdb, 0, "KASSERT will enter the debugger");
|
|
#endif
|
|
|
|
#ifdef KTR
|
|
SYSCTL_UINT(_debug_kassert, OID_AUTO, do_ktr, CTLFLAG_RWTUN,
|
|
&kassert_do_ktr, 0,
|
|
"KASSERT does a KTR, set this to the KTRMASK you want");
|
|
#endif
|
|
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, do_log, CTLFLAG_RWTUN,
|
|
&kassert_do_log, 0, "KASSERT triggers a panic (1) or just a warning (0)");
|
|
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, warnings, CTLFLAG_RWTUN,
|
|
&kassert_warnings, 0, "number of KASSERTs that have been triggered");
|
|
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, log_panic_at, CTLFLAG_RWTUN,
|
|
&kassert_log_panic_at, 0, "max number of KASSERTS before we will panic");
|
|
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, log_pps_limit, CTLFLAG_RWTUN,
|
|
&kassert_log_pps_limit, 0, "limit number of log messages per second");
|
|
|
|
SYSCTL_INT(_debug_kassert, OID_AUTO, log_mute_at, CTLFLAG_RWTUN,
|
|
&kassert_log_mute_at, 0, "max number of KASSERTS to log");
|
|
|
|
static int kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS);
|
|
|
|
SYSCTL_PROC(_debug_kassert, OID_AUTO, kassert,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, NULL, 0,
|
|
kassert_sysctl_kassert, "I", "set to trigger a test kassert");
|
|
|
|
static int
|
|
kassert_sysctl_kassert(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i;
|
|
|
|
error = sysctl_wire_old_buffer(req, sizeof(int));
|
|
if (error == 0) {
|
|
i = 0;
|
|
error = sysctl_handle_int(oidp, &i, 0, req);
|
|
}
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
KASSERT(0, ("kassert_sysctl_kassert triggered kassert %d", i));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Called by KASSERT, this decides if we will panic
|
|
* or if we will log via printf and/or ktr.
|
|
*/
|
|
void
|
|
kassert_panic(const char *fmt, ...)
|
|
{
|
|
static char buf[256];
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
va_end(ap);
|
|
|
|
/*
|
|
* panic if we're not just warning, or if we've exceeded
|
|
* kassert_log_panic_at warnings.
|
|
*/
|
|
if (!kassert_warn_only ||
|
|
(kassert_log_panic_at > 0 &&
|
|
kassert_warnings >= kassert_log_panic_at)) {
|
|
va_start(ap, fmt);
|
|
vpanic(fmt, ap);
|
|
/* NORETURN */
|
|
}
|
|
#ifdef KTR
|
|
if (kassert_do_ktr)
|
|
CTR0(ktr_mask, buf);
|
|
#endif /* KTR */
|
|
/*
|
|
* log if we've not yet met the mute limit.
|
|
*/
|
|
if (kassert_do_log &&
|
|
(kassert_log_mute_at == 0 ||
|
|
kassert_warnings < kassert_log_mute_at)) {
|
|
static struct timeval lasterr;
|
|
static int curerr;
|
|
|
|
if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
|
|
printf("KASSERT failed: %s\n", buf);
|
|
kdb_backtrace();
|
|
}
|
|
}
|
|
#ifdef KDB
|
|
if (kassert_do_kdb) {
|
|
kdb_enter(KDB_WHY_KASSERT, buf);
|
|
}
|
|
#endif
|
|
atomic_add_int(&kassert_warnings, 1);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
|
|
* and then reboots. If we are called twice, then we avoid trying to sync
|
|
* the disks as this often leads to recursive panics.
|
|
*/
|
|
void
|
|
panic(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
vpanic(fmt, ap);
|
|
}
|
|
|
|
void
|
|
vpanic(const char *fmt, va_list ap)
|
|
{
|
|
#ifdef SMP
|
|
cpuset_t other_cpus;
|
|
#endif
|
|
struct thread *td = curthread;
|
|
int bootopt, newpanic;
|
|
static char buf[256];
|
|
|
|
spinlock_enter();
|
|
|
|
#ifdef SMP
|
|
/*
|
|
* stop_cpus_hard(other_cpus) should prevent multiple CPUs from
|
|
* concurrently entering panic. Only the winner will proceed
|
|
* further.
|
|
*/
|
|
if (panicstr == NULL && !kdb_active) {
|
|
other_cpus = all_cpus;
|
|
CPU_CLR(PCPU_GET(cpuid), &other_cpus);
|
|
stop_cpus_hard(other_cpus);
|
|
}
|
|
|
|
/*
|
|
* Ensure that the scheduler is stopped while panicking, even if panic
|
|
* has been entered from kdb.
|
|
*/
|
|
td->td_stopsched = 1;
|
|
#endif
|
|
|
|
bootopt = RB_AUTOBOOT;
|
|
newpanic = 0;
|
|
if (panicstr)
|
|
bootopt |= RB_NOSYNC;
|
|
else {
|
|
bootopt |= RB_DUMP;
|
|
panicstr = fmt;
|
|
newpanic = 1;
|
|
}
|
|
|
|
if (newpanic) {
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
panicstr = buf;
|
|
cngrab();
|
|
printf("panic: %s\n", buf);
|
|
} else {
|
|
printf("panic: ");
|
|
vprintf(fmt, ap);
|
|
printf("\n");
|
|
}
|
|
#ifdef SMP
|
|
printf("cpuid = %d\n", PCPU_GET(cpuid));
|
|
#endif
|
|
|
|
#ifdef KDB
|
|
if (newpanic && trace_on_panic)
|
|
kdb_backtrace();
|
|
if (debugger_on_panic)
|
|
kdb_enter(KDB_WHY_PANIC, "panic");
|
|
#endif
|
|
/*thread_lock(td); */
|
|
td->td_flags |= TDF_INPANIC;
|
|
/* thread_unlock(td); */
|
|
if (!sync_on_panic)
|
|
bootopt |= RB_NOSYNC;
|
|
kern_reboot(bootopt);
|
|
}
|
|
|
|
/*
|
|
* Support for poweroff delay.
|
|
*
|
|
* Please note that setting this delay too short might power off your machine
|
|
* before the write cache on your hard disk has been flushed, leading to
|
|
* soft-updates inconsistencies.
|
|
*/
|
|
#ifndef POWEROFF_DELAY
|
|
# define POWEROFF_DELAY 5000
|
|
#endif
|
|
static int poweroff_delay = POWEROFF_DELAY;
|
|
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, poweroff_delay, CTLFLAG_RW,
|
|
&poweroff_delay, 0, "Delay before poweroff to write disk caches (msec)");
|
|
|
|
static void
|
|
poweroff_wait(void *junk, int howto)
|
|
{
|
|
|
|
if (!(howto & RB_POWEROFF) || poweroff_delay <= 0)
|
|
return;
|
|
DELAY(poweroff_delay * 1000);
|
|
}
|
|
|
|
/*
|
|
* Some system processes (e.g. syncer) need to be stopped at appropriate
|
|
* points in their main loops prior to a system shutdown, so that they
|
|
* won't interfere with the shutdown process (e.g. by holding a disk buf
|
|
* to cause sync to fail). For each of these system processes, register
|
|
* shutdown_kproc() as a handler for one of shutdown events.
|
|
*/
|
|
static int kproc_shutdown_wait = 60;
|
|
SYSCTL_INT(_kern_shutdown, OID_AUTO, kproc_shutdown_wait, CTLFLAG_RW,
|
|
&kproc_shutdown_wait, 0, "Max wait time (sec) to stop for each process");
|
|
|
|
void
|
|
kproc_shutdown(void *arg, int howto)
|
|
{
|
|
struct proc *p;
|
|
int error;
|
|
|
|
if (panicstr)
|
|
return;
|
|
|
|
p = (struct proc *)arg;
|
|
printf("Waiting (max %d seconds) for system process `%s' to stop...",
|
|
kproc_shutdown_wait, p->p_comm);
|
|
error = kproc_suspend(p, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("done\n");
|
|
}
|
|
|
|
void
|
|
kthread_shutdown(void *arg, int howto)
|
|
{
|
|
struct thread *td;
|
|
int error;
|
|
|
|
if (panicstr)
|
|
return;
|
|
|
|
td = (struct thread *)arg;
|
|
printf("Waiting (max %d seconds) for system thread `%s' to stop...",
|
|
kproc_shutdown_wait, td->td_name);
|
|
error = kthread_suspend(td, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("done\n");
|
|
}
|
|
|
|
static char dumpdevname[sizeof(((struct cdev*)NULL)->si_name)];
|
|
SYSCTL_STRING(_kern_shutdown, OID_AUTO, dumpdevname, CTLFLAG_RD,
|
|
dumpdevname, 0, "Device for kernel dumps");
|
|
|
|
/* Registration of dumpers */
|
|
int
|
|
set_dumper(struct dumperinfo *di, const char *devname, struct thread *td)
|
|
{
|
|
size_t wantcopy;
|
|
int error;
|
|
|
|
error = priv_check(td, PRIV_SETDUMPER);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (di == NULL) {
|
|
bzero(&dumper, sizeof dumper);
|
|
dumpdevname[0] = '\0';
|
|
return (0);
|
|
}
|
|
if (dumper.dumper != NULL)
|
|
return (EBUSY);
|
|
dumper = *di;
|
|
wantcopy = strlcpy(dumpdevname, devname, sizeof(dumpdevname));
|
|
if (wantcopy >= sizeof(dumpdevname)) {
|
|
printf("set_dumper: device name truncated from '%s' -> '%s'\n",
|
|
devname, dumpdevname);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Call dumper with bounds checking. */
|
|
int
|
|
dump_write(struct dumperinfo *di, void *virtual, vm_offset_t physical,
|
|
off_t offset, size_t length)
|
|
{
|
|
|
|
if (length != 0 && (offset < di->mediaoffset ||
|
|
offset - di->mediaoffset + length > di->mediasize)) {
|
|
printf("Attempt to write outside dump device boundaries.\n"
|
|
"offset(%jd), mediaoffset(%jd), length(%ju), mediasize(%jd).\n",
|
|
(intmax_t)offset, (intmax_t)di->mediaoffset,
|
|
(uintmax_t)length, (intmax_t)di->mediasize);
|
|
return (ENOSPC);
|
|
}
|
|
return (di->dumper(di->priv, virtual, physical, offset, length));
|
|
}
|
|
|
|
void
|
|
mkdumpheader(struct kerneldumpheader *kdh, char *magic, uint32_t archver,
|
|
uint64_t dumplen, uint32_t blksz)
|
|
{
|
|
|
|
bzero(kdh, sizeof(*kdh));
|
|
strlcpy(kdh->magic, magic, sizeof(kdh->magic));
|
|
strlcpy(kdh->architecture, MACHINE_ARCH, sizeof(kdh->architecture));
|
|
kdh->version = htod32(KERNELDUMPVERSION);
|
|
kdh->architectureversion = htod32(archver);
|
|
kdh->dumplength = htod64(dumplen);
|
|
kdh->dumptime = htod64(time_second);
|
|
kdh->blocksize = htod32(blksz);
|
|
strlcpy(kdh->hostname, prison0.pr_hostname, sizeof(kdh->hostname));
|
|
strlcpy(kdh->versionstring, version, sizeof(kdh->versionstring));
|
|
if (panicstr != NULL)
|
|
strlcpy(kdh->panicstring, panicstr, sizeof(kdh->panicstring));
|
|
kdh->parity = kerneldump_parity(kdh);
|
|
}
|