1432aa0c5e
then one can restart from a panic by resetting the panicstr variable to NULL. This commit conditionalizes the previously committed functionality on this variable. It also removes the __dead2 attribute from the panic() function so that when one continues from a panic() the behavior will be predictable.
675 lines
16 KiB
C
675 lines
16 KiB
C
/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94
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* $FreeBSD$
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*/
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#include "opt_ddb.h"
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#include "opt_hw_wdog.h"
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#include "opt_panic.h"
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#include "opt_show_busybufs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/disklabel.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/resourcevar.h>
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#include <sys/smp.h> /* smp_active */
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#include <sys/sysctl.h>
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#include <sys/sysproto.h>
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#include <sys/vnode.h>
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#include <machine/pcb.h>
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#include <machine/md_var.h>
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#include <sys/signalvar.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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#ifndef PANIC_REBOOT_WAIT_TIME
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#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
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#endif
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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#ifdef DDB
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#ifdef DDB_UNATTENDED
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int debugger_on_panic = 0;
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#else
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int debugger_on_panic = 1;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
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&debugger_on_panic, 0, "Run debugger on kernel panic");
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#endif
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SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0, "Shutdown environment");
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#ifdef HW_WDOG
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/*
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* If there is a hardware watchdog, point this at the function needed to
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* hold it off.
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* It's needed when the kernel needs to do some lengthy operations.
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* e.g. in wd.c when dumping core.. It's most annoying to have
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* your precious core-dump only half written because the wdog kicked in.
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*/
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watchdog_tickle_fn wdog_tickler = NULL;
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#endif /* HW_WDOG */
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/*
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* Variable panicstr contains argument to first call to panic; used as flag
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* to indicate that the kernel has already called panic.
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*/
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const char *panicstr;
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int dumping; /* system is dumping */
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static void boot(int) __dead2;
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static void dumpsys(void);
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static void poweroff_wait(void *, int);
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static void shutdown_halt(void *junk, int howto);
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static void shutdown_panic(void *junk, int howto);
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static void shutdown_reset(void *junk, int howto);
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/* register various local shutdown events */
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static void
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shutdown_conf(void *unused)
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{
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EVENTHANDLER_REGISTER(shutdown_final, poweroff_wait, NULL, SHUTDOWN_PRI_FIRST);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_halt, NULL, SHUTDOWN_PRI_LAST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_panic, NULL, SHUTDOWN_PRI_LAST + 100);
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EVENTHANDLER_REGISTER(shutdown_final, shutdown_reset, NULL, SHUTDOWN_PRI_LAST + 200);
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}
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SYSINIT(shutdown_conf, SI_SUB_INTRINSIC, SI_ORDER_ANY, shutdown_conf, NULL)
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/* ARGSUSED */
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/*
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* The system call that results in a reboot
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*/
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int
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reboot(struct proc *p, struct reboot_args *uap)
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{
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int error;
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if ((error = suser(p)))
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return (error);
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boot(uap->opt);
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return (0);
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}
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/*
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* Called by events that want to shut down.. e.g <CTL><ALT><DEL> on a PC
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*/
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static int shutdown_howto = 0;
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void
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shutdown_nice(int howto)
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{
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shutdown_howto = howto;
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/* Send a signal to init(8) and have it shutdown the world */
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if (initproc != NULL) {
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PROC_LOCK(initproc);
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psignal(initproc, SIGINT);
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PROC_UNLOCK(initproc);
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} else {
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/* No init(8) running, so simply reboot */
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boot(RB_NOSYNC);
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}
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return;
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}
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static int waittime = -1;
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static struct pcb dumppcb;
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static void
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print_uptime(void)
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{
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int f;
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struct timespec ts;
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getnanouptime(&ts);
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printf("Uptime: ");
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f = 0;
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if (ts.tv_sec >= 86400) {
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printf("%ldd", (long)ts.tv_sec / 86400);
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ts.tv_sec %= 86400;
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f = 1;
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}
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if (f || ts.tv_sec >= 3600) {
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printf("%ldh", (long)ts.tv_sec / 3600);
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ts.tv_sec %= 3600;
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f = 1;
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}
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if (f || ts.tv_sec >= 60) {
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printf("%ldm", (long)ts.tv_sec / 60);
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ts.tv_sec %= 60;
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f = 1;
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}
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printf("%lds\n", (long)ts.tv_sec);
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}
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/*
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* Go through the rigmarole of shutting down..
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* this used to be in machdep.c but I'll be dammned if I could see
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* anything machine dependant in it.
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*/
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static void
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boot(int howto)
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{
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/* collect extra flags that shutdown_nice might have set */
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howto |= shutdown_howto;
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#ifdef DDB
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/* We are out of the debugger now. */
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db_active = 0;
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#endif
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#ifdef SMP
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if (smp_active)
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printf("boot() called on cpu#%d\n", PCPU_GET(cpuid));
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#endif
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/*
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* Do any callouts that should be done BEFORE syncing the filesystems.
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*/
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EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);
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/*
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* Now sync filesystems
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*/
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if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
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register struct buf *bp;
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int iter, nbusy, pbusy;
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int subiter;
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waittime = 0;
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printf("\nsyncing disks... ");
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sync(&proc0, NULL);
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/*
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* With soft updates, some buffers that are
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* written will be remarked as dirty until other
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* buffers are written.
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*/
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for (iter = pbusy = 0; iter < 20; iter++) {
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if ((bp->b_flags & B_INVAL) == 0 &&
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BUF_REFCNT(bp) > 0) {
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nbusy++;
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} else if ((bp->b_flags & (B_DELWRI | B_INVAL))
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== B_DELWRI) {
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/* bawrite(bp);*/
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nbusy++;
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}
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}
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if (nbusy == 0)
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break;
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printf("%d ", nbusy);
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if (nbusy < pbusy)
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iter = 0;
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pbusy = nbusy;
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sync(&proc0, NULL);
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if (curproc != NULL) {
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DROP_GIANT_NOSWITCH();
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for (subiter = 0; subiter < 50 * iter; subiter++) {
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mtx_lock_spin(&sched_lock);
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setrunqueue(curproc);
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curproc->p_stats->p_ru.ru_nvcsw++;
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mi_switch(); /* Allow interrupt threads to run */
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mtx_unlock_spin(&sched_lock);
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DELAY(1000);
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}
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PICKUP_GIANT();
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} else
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DELAY(50000 * iter);
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}
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printf("\n");
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/*
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* Count only busy local buffers to prevent forcing
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* a fsck if we're just a client of a wedged NFS server
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*/
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nbusy = 0;
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for (bp = &buf[nbuf]; --bp >= buf; ) {
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if (((bp->b_flags&B_INVAL) == 0 && BUF_REFCNT(bp)) ||
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((bp->b_flags & (B_DELWRI|B_INVAL)) == B_DELWRI)) {
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if (bp->b_dev == NODEV) {
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TAILQ_REMOVE(&mountlist,
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bp->b_vp->v_mount, mnt_list);
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continue;
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}
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nbusy++;
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#if defined(SHOW_BUSYBUFS) || defined(DIAGNOSTIC)
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printf(
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"%d: dev:%s, flags:%08lx, blkno:%ld, lblkno:%ld\n",
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nbusy, devtoname(bp->b_dev),
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bp->b_flags, (long)bp->b_blkno,
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(long)bp->b_lblkno);
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#endif
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}
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}
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if (nbusy) {
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/*
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* Failed to sync all blocks. Indicate this and don't
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* unmount filesystems (thus forcing an fsck on reboot).
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*/
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printf("giving up on %d buffers\n", nbusy);
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DELAY(5000000); /* 5 seconds */
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} else {
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printf("done\n");
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/*
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* Unmount filesystems
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*/
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if (panicstr == 0)
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vfs_unmountall();
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}
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DELAY(100000); /* wait for console output to finish */
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}
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print_uptime();
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/*
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* Ok, now do things that assume all filesystem activity has
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* been completed.
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*/
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EVENTHANDLER_INVOKE(shutdown_post_sync, howto);
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splhigh();
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if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold)
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dumpsys();
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/* Now that we're going to really halt the system... */
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EVENTHANDLER_INVOKE(shutdown_final, howto);
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for(;;) ; /* safety against shutdown_reset not working */
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/* NOTREACHED */
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}
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/*
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* If the shutdown was a clean halt, behave accordingly.
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*/
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static void
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shutdown_halt(void *junk, int howto)
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{
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if (howto & RB_HALT) {
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printf("\n");
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printf("The operating system has halted.\n");
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printf("Please press any key to reboot.\n\n");
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switch (cngetc()) {
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case -1: /* No console, just die */
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cpu_halt();
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/* NOTREACHED */
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default:
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howto &= ~RB_HALT;
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break;
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}
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}
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}
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/*
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* Check to see if the system paniced, pause and then reboot
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* according to the specified delay.
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*/
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static void
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shutdown_panic(void *junk, int howto)
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{
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int loop;
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if (howto & RB_DUMP) {
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if (PANIC_REBOOT_WAIT_TIME != 0) {
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if (PANIC_REBOOT_WAIT_TIME != -1) {
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printf("Automatic reboot in %d seconds - "
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"press a key on the console to abort\n",
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PANIC_REBOOT_WAIT_TIME);
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for (loop = PANIC_REBOOT_WAIT_TIME * 10;
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loop > 0; --loop) {
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DELAY(1000 * 100); /* 1/10th second */
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/* Did user type a key? */
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if (cncheckc() != -1)
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break;
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}
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if (!loop)
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return;
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}
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} else { /* zero time specified - reboot NOW */
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return;
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}
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printf("--> Press a key on the console to reboot <--\n");
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cngetc();
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}
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}
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/*
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* Everything done, now reset
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*/
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static void
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shutdown_reset(void *junk, int howto)
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{
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printf("Rebooting...\n");
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DELAY(1000000); /* wait 1 sec for printf's to complete and be read */
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/* cpu_boot(howto); */ /* doesn't do anything at the moment */
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cpu_reset();
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/* NOTREACHED */ /* assuming reset worked */
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}
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/*
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* Magic number for savecore
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*
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* exported (symorder) and used at least by savecore(8)
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*
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*/
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static u_long const dumpmag = 0x8fca0101UL;
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static int dumpsize = 0; /* also for savecore */
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static int dodump = 1;
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SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0,
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"Try to perform coredump on kernel panic");
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static int
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setdumpdev(dev_t dev)
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{
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int psize;
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long newdumplo;
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if (dev == NODEV) {
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dumpdev = dev;
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return (0);
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}
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if (devsw(dev) == NULL)
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return (ENXIO); /* XXX is this right? */
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if (devsw(dev)->d_psize == NULL)
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return (ENXIO); /* XXX should be ENODEV ? */
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psize = devsw(dev)->d_psize(dev);
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if (psize == -1)
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return (ENXIO); /* XXX should be ENODEV ? */
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/*
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* XXX should clean up checking in dumpsys() to be more like this.
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*/
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newdumplo = psize - Maxmem * (PAGE_SIZE / DEV_BSIZE);
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if (newdumplo <= LABELSECTOR)
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return (ENOSPC);
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dumpdev = dev;
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dumplo = newdumplo;
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return (0);
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}
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/* ARGSUSED */
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static void
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dump_conf(void *dummy)
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{
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if (setdumpdev(dumpdev) != 0)
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dumpdev = NODEV;
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}
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SYSINIT(dump_conf, SI_SUB_DUMP_CONF, SI_ORDER_FIRST, dump_conf, NULL)
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static int
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sysctl_kern_dumpdev(SYSCTL_HANDLER_ARGS)
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{
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int error;
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udev_t ndumpdev;
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ndumpdev = dev2udev(dumpdev);
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error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
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if (error == 0 && req->newptr != NULL)
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error = setdumpdev(udev2dev(ndumpdev, 0));
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return (error);
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}
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SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
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0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
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/*
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|
* Doadump comes here after turning off memory management and
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|
* getting on the dump stack, either when called above, or by
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* the auto-restart code.
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*/
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|
static void
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dumpsys(void)
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{
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int error;
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savectx(&dumppcb);
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|
if (dumping++) {
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printf("Dump already in progress, bailing...\n");
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return;
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}
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if (!dodump)
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return;
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if (dumpdev == NODEV)
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return;
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if (!(devsw(dumpdev)))
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return;
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if (!(devsw(dumpdev)->d_dump))
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return;
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dumpsize = Maxmem;
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printf("\ndumping to dev %s, offset %ld\n", devtoname(dumpdev), dumplo);
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printf("dump ");
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error = (*devsw(dumpdev)->d_dump)(dumpdev);
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if (error == 0) {
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printf("succeeded\n");
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return;
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}
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printf("failed, reason: ");
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switch (error) {
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case ENODEV:
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printf("device doesn't support a dump routine\n");
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break;
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case ENXIO:
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printf("device bad\n");
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break;
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case EFAULT:
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printf("device not ready\n");
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break;
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case EINVAL:
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printf("area improper\n");
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break;
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case EIO:
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printf("i/o error\n");
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break;
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case EINTR:
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printf("aborted from console\n");
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break;
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|
|
|
default:
|
|
printf("unknown, error = %d\n", error);
|
|
break;
|
|
}
|
|
}
|
|
|
|
int
|
|
dumpstatus(vm_offset_t addr, long count)
|
|
{
|
|
int c;
|
|
|
|
if (addr % (1024 * 1024) == 0) {
|
|
#ifdef HW_WDOG
|
|
if (wdog_tickler)
|
|
(*wdog_tickler)();
|
|
#endif
|
|
printf("%ld ", count / (1024 * 1024));
|
|
}
|
|
|
|
if ((c = cncheckc()) == 0x03)
|
|
return -1;
|
|
else if (c != -1)
|
|
printf("[CTRL-C to abort] ");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef SMP
|
|
static u_int panic_cpu = NOCPU;
|
|
#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, ...)
|
|
{
|
|
int bootopt;
|
|
va_list ap;
|
|
static char buf[256];
|
|
|
|
#ifdef SMP
|
|
/*
|
|
* We don't want multiple CPU's to panic at the same time, so we
|
|
* use panic_cpu as a simple spinlock. We have to keep checking
|
|
* panic_cpu if we are spinning in case the panic on the first
|
|
* CPU is canceled.
|
|
*/
|
|
if (panic_cpu != PCPU_GET(cpuid))
|
|
while (atomic_cmpset_int(&panic_cpu, NOCPU,
|
|
PCPU_GET(cpuid)) == 0)
|
|
while (panic_cpu != NOCPU)
|
|
; /* nothing */
|
|
#endif
|
|
|
|
bootopt = RB_AUTOBOOT | RB_DUMP;
|
|
if (panicstr)
|
|
bootopt |= RB_NOSYNC;
|
|
else
|
|
panicstr = fmt;
|
|
|
|
va_start(ap, fmt);
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
if (panicstr == fmt)
|
|
panicstr = buf;
|
|
va_end(ap);
|
|
printf("panic: %s\n", buf);
|
|
#ifdef SMP
|
|
/* two separate prints in case of an unmapped page and trap */
|
|
printf("cpuid = %d; ", PCPU_GET(cpuid));
|
|
#ifdef APIC_IO
|
|
printf("lapic.id = %08x\n", lapic.id);
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(DDB)
|
|
if (debugger_on_panic)
|
|
Debugger ("panic");
|
|
#ifdef RESTARTABLE_PANICS
|
|
/* See if the user aborted the panic, in which case we continue. */
|
|
if (panicstr == NULL) {
|
|
#ifdef SMP
|
|
atomic_store_rel_int(&panic_cpu, NOCPU);
|
|
#endif
|
|
return;
|
|
}
|
|
#endif
|
|
#endif
|
|
boot(bootopt);
|
|
}
|
|
|
|
/*
|
|
* Support for poweroff delay.
|
|
*/
|
|
#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, "");
|
|
|
|
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, "");
|
|
|
|
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 = kthread_suspend(p, kproc_shutdown_wait * hz);
|
|
|
|
if (error == EWOULDBLOCK)
|
|
printf("timed out\n");
|
|
else
|
|
printf("stopped\n");
|
|
}
|