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![Sebastian Andrzej Siewior](/assets/img/avatar_default.png)
The oops id has been added as part of the end of trace marker for the kerneloops.org project. The id is used to automatically identify duplicate submissions of the same report. Identical looking reports with different a id can be considered as the same oops occurred again. The early initialisation of the oops_id can create a warning if the random core is not yet fully initialized. On PREEMPT_RT it is problematic if the id is initialized on demand from non preemptible context. The kernel oops project is not available since 2017. Remove the oops_id and use 0 in the output in case parser rely on it. Link: https://bugs.debian.org/953172 Link: https://lkml.kernel.org/r/Ybdi16aP2NEugWHq@linutronix.de Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
719 lines
18 KiB
C
719 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/kernel/panic.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* This function is used through-out the kernel (including mm and fs)
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* to indicate a major problem.
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*/
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#include <linux/debug_locks.h>
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#include <linux/sched/debug.h>
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#include <linux/interrupt.h>
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#include <linux/kgdb.h>
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#include <linux/kmsg_dump.h>
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#include <linux/kallsyms.h>
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#include <linux/notifier.h>
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#include <linux/vt_kern.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/ftrace.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/kexec.h>
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#include <linux/panic_notifier.h>
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#include <linux/sched.h>
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#include <linux/sysrq.h>
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#include <linux/init.h>
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#include <linux/nmi.h>
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#include <linux/console.h>
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#include <linux/bug.h>
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#include <linux/ratelimit.h>
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#include <linux/debugfs.h>
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#include <trace/events/error_report.h>
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#include <asm/sections.h>
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#define PANIC_TIMER_STEP 100
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#define PANIC_BLINK_SPD 18
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#ifdef CONFIG_SMP
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/*
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* Should we dump all CPUs backtraces in an oops event?
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* Defaults to 0, can be changed via sysctl.
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*/
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unsigned int __read_mostly sysctl_oops_all_cpu_backtrace;
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#endif /* CONFIG_SMP */
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int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
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static unsigned long tainted_mask =
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IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0;
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static int pause_on_oops;
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static int pause_on_oops_flag;
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static DEFINE_SPINLOCK(pause_on_oops_lock);
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bool crash_kexec_post_notifiers;
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int panic_on_warn __read_mostly;
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unsigned long panic_on_taint;
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bool panic_on_taint_nousertaint = false;
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int panic_timeout = CONFIG_PANIC_TIMEOUT;
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EXPORT_SYMBOL_GPL(panic_timeout);
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#define PANIC_PRINT_TASK_INFO 0x00000001
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#define PANIC_PRINT_MEM_INFO 0x00000002
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#define PANIC_PRINT_TIMER_INFO 0x00000004
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#define PANIC_PRINT_LOCK_INFO 0x00000008
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#define PANIC_PRINT_FTRACE_INFO 0x00000010
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#define PANIC_PRINT_ALL_PRINTK_MSG 0x00000020
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unsigned long panic_print;
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ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
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EXPORT_SYMBOL(panic_notifier_list);
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static long no_blink(int state)
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{
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return 0;
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}
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/* Returns how long it waited in ms */
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long (*panic_blink)(int state);
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EXPORT_SYMBOL(panic_blink);
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/*
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* Stop ourself in panic -- architecture code may override this
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*/
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void __weak panic_smp_self_stop(void)
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{
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while (1)
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cpu_relax();
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}
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/*
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* Stop ourselves in NMI context if another CPU has already panicked. Arch code
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* may override this to prepare for crash dumping, e.g. save regs info.
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*/
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void __weak nmi_panic_self_stop(struct pt_regs *regs)
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{
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panic_smp_self_stop();
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}
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/*
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* Stop other CPUs in panic. Architecture dependent code may override this
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* with more suitable version. For example, if the architecture supports
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* crash dump, it should save registers of each stopped CPU and disable
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* per-CPU features such as virtualization extensions.
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*/
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void __weak crash_smp_send_stop(void)
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{
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static int cpus_stopped;
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/*
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* This function can be called twice in panic path, but obviously
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* we execute this only once.
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*/
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if (cpus_stopped)
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return;
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/*
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* Note smp_send_stop is the usual smp shutdown function, which
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* unfortunately means it may not be hardened to work in a panic
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* situation.
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*/
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smp_send_stop();
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cpus_stopped = 1;
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}
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atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID);
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/*
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* A variant of panic() called from NMI context. We return if we've already
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* panicked on this CPU. If another CPU already panicked, loop in
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* nmi_panic_self_stop() which can provide architecture dependent code such
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* as saving register state for crash dump.
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*/
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void nmi_panic(struct pt_regs *regs, const char *msg)
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{
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int old_cpu, cpu;
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cpu = raw_smp_processor_id();
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old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu);
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if (old_cpu == PANIC_CPU_INVALID)
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panic("%s", msg);
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else if (old_cpu != cpu)
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nmi_panic_self_stop(regs);
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}
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EXPORT_SYMBOL(nmi_panic);
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static void panic_print_sys_info(void)
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{
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if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG)
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console_flush_on_panic(CONSOLE_REPLAY_ALL);
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if (panic_print & PANIC_PRINT_TASK_INFO)
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show_state();
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if (panic_print & PANIC_PRINT_MEM_INFO)
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show_mem(0, NULL);
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if (panic_print & PANIC_PRINT_TIMER_INFO)
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sysrq_timer_list_show();
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if (panic_print & PANIC_PRINT_LOCK_INFO)
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debug_show_all_locks();
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if (panic_print & PANIC_PRINT_FTRACE_INFO)
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ftrace_dump(DUMP_ALL);
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}
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/**
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* panic - halt the system
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* @fmt: The text string to print
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*
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* Display a message, then perform cleanups.
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*
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* This function never returns.
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*/
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void panic(const char *fmt, ...)
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{
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static char buf[1024];
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va_list args;
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long i, i_next = 0, len;
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int state = 0;
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int old_cpu, this_cpu;
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bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;
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/*
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* Disable local interrupts. This will prevent panic_smp_self_stop
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* from deadlocking the first cpu that invokes the panic, since
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* there is nothing to prevent an interrupt handler (that runs
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* after setting panic_cpu) from invoking panic() again.
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*/
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local_irq_disable();
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preempt_disable_notrace();
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/*
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* It's possible to come here directly from a panic-assertion and
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* not have preempt disabled. Some functions called from here want
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* preempt to be disabled. No point enabling it later though...
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*
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* Only one CPU is allowed to execute the panic code from here. For
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* multiple parallel invocations of panic, all other CPUs either
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* stop themself or will wait until they are stopped by the 1st CPU
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* with smp_send_stop().
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*
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* `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which
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* comes here, so go ahead.
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* `old_cpu == this_cpu' means we came from nmi_panic() which sets
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* panic_cpu to this CPU. In this case, this is also the 1st CPU.
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*/
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this_cpu = raw_smp_processor_id();
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old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu);
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if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
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panic_smp_self_stop();
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console_verbose();
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bust_spinlocks(1);
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va_start(args, fmt);
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len = vscnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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if (len && buf[len - 1] == '\n')
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buf[len - 1] = '\0';
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pr_emerg("Kernel panic - not syncing: %s\n", buf);
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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/*
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* Avoid nested stack-dumping if a panic occurs during oops processing
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*/
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if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
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dump_stack();
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#endif
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/*
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* If kgdb is enabled, give it a chance to run before we stop all
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* the other CPUs or else we won't be able to debug processes left
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* running on them.
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*/
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kgdb_panic(buf);
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/*
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* If we have crashed and we have a crash kernel loaded let it handle
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* everything else.
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* If we want to run this after calling panic_notifiers, pass
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* the "crash_kexec_post_notifiers" option to the kernel.
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*
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* Bypass the panic_cpu check and call __crash_kexec directly.
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*/
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if (!_crash_kexec_post_notifiers) {
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__crash_kexec(NULL);
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/*
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* Note smp_send_stop is the usual smp shutdown function, which
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* unfortunately means it may not be hardened to work in a
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* panic situation.
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*/
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smp_send_stop();
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} else {
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/*
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* If we want to do crash dump after notifier calls and
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* kmsg_dump, we will need architecture dependent extra
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* works in addition to stopping other CPUs.
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*/
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crash_smp_send_stop();
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}
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/*
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* Run any panic handlers, including those that might need to
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* add information to the kmsg dump output.
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*/
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atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
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kmsg_dump(KMSG_DUMP_PANIC);
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/*
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* If you doubt kdump always works fine in any situation,
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* "crash_kexec_post_notifiers" offers you a chance to run
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* panic_notifiers and dumping kmsg before kdump.
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* Note: since some panic_notifiers can make crashed kernel
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* more unstable, it can increase risks of the kdump failure too.
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*
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* Bypass the panic_cpu check and call __crash_kexec directly.
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*/
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if (_crash_kexec_post_notifiers)
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__crash_kexec(NULL);
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#ifdef CONFIG_VT
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unblank_screen();
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#endif
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console_unblank();
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/*
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* We may have ended up stopping the CPU holding the lock (in
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* smp_send_stop()) while still having some valuable data in the console
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* buffer. Try to acquire the lock then release it regardless of the
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* result. The release will also print the buffers out. Locks debug
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* should be disabled to avoid reporting bad unlock balance when
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* panic() is not being callled from OOPS.
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*/
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debug_locks_off();
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console_flush_on_panic(CONSOLE_FLUSH_PENDING);
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panic_print_sys_info();
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if (!panic_blink)
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panic_blink = no_blink;
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if (panic_timeout > 0) {
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/*
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* Delay timeout seconds before rebooting the machine.
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* We can't use the "normal" timers since we just panicked.
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*/
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pr_emerg("Rebooting in %d seconds..\n", panic_timeout);
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for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
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touch_nmi_watchdog();
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if (i >= i_next) {
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i += panic_blink(state ^= 1);
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i_next = i + 3600 / PANIC_BLINK_SPD;
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}
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mdelay(PANIC_TIMER_STEP);
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}
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}
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if (panic_timeout != 0) {
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/*
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* This will not be a clean reboot, with everything
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* shutting down. But if there is a chance of
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* rebooting the system it will be rebooted.
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*/
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if (panic_reboot_mode != REBOOT_UNDEFINED)
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reboot_mode = panic_reboot_mode;
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emergency_restart();
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}
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#ifdef __sparc__
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{
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extern int stop_a_enabled;
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/* Make sure the user can actually press Stop-A (L1-A) */
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stop_a_enabled = 1;
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pr_emerg("Press Stop-A (L1-A) from sun keyboard or send break\n"
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"twice on console to return to the boot prom\n");
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}
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#endif
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#if defined(CONFIG_S390)
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disabled_wait();
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#endif
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pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
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/* Do not scroll important messages printed above */
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suppress_printk = 1;
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local_irq_enable();
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for (i = 0; ; i += PANIC_TIMER_STEP) {
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touch_softlockup_watchdog();
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if (i >= i_next) {
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i += panic_blink(state ^= 1);
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i_next = i + 3600 / PANIC_BLINK_SPD;
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}
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mdelay(PANIC_TIMER_STEP);
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}
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}
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EXPORT_SYMBOL(panic);
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/*
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* TAINT_FORCED_RMMOD could be a per-module flag but the module
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* is being removed anyway.
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*/
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const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
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[ TAINT_PROPRIETARY_MODULE ] = { 'P', 'G', true },
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[ TAINT_FORCED_MODULE ] = { 'F', ' ', true },
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[ TAINT_CPU_OUT_OF_SPEC ] = { 'S', ' ', false },
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[ TAINT_FORCED_RMMOD ] = { 'R', ' ', false },
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[ TAINT_MACHINE_CHECK ] = { 'M', ' ', false },
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[ TAINT_BAD_PAGE ] = { 'B', ' ', false },
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[ TAINT_USER ] = { 'U', ' ', false },
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[ TAINT_DIE ] = { 'D', ' ', false },
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[ TAINT_OVERRIDDEN_ACPI_TABLE ] = { 'A', ' ', false },
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[ TAINT_WARN ] = { 'W', ' ', false },
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[ TAINT_CRAP ] = { 'C', ' ', true },
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[ TAINT_FIRMWARE_WORKAROUND ] = { 'I', ' ', false },
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[ TAINT_OOT_MODULE ] = { 'O', ' ', true },
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[ TAINT_UNSIGNED_MODULE ] = { 'E', ' ', true },
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[ TAINT_SOFTLOCKUP ] = { 'L', ' ', false },
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[ TAINT_LIVEPATCH ] = { 'K', ' ', true },
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[ TAINT_AUX ] = { 'X', ' ', true },
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[ TAINT_RANDSTRUCT ] = { 'T', ' ', true },
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};
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/**
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* print_tainted - return a string to represent the kernel taint state.
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*
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* For individual taint flag meanings, see Documentation/admin-guide/sysctl/kernel.rst
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*
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* The string is overwritten by the next call to print_tainted(),
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* but is always NULL terminated.
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*/
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const char *print_tainted(void)
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{
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static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")];
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BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT);
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if (tainted_mask) {
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char *s;
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int i;
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s = buf + sprintf(buf, "Tainted: ");
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for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
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const struct taint_flag *t = &taint_flags[i];
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*s++ = test_bit(i, &tainted_mask) ?
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t->c_true : t->c_false;
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}
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*s = 0;
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} else
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snprintf(buf, sizeof(buf), "Not tainted");
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return buf;
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}
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int test_taint(unsigned flag)
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{
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return test_bit(flag, &tainted_mask);
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}
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EXPORT_SYMBOL(test_taint);
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unsigned long get_taint(void)
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{
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return tainted_mask;
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}
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/**
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* add_taint: add a taint flag if not already set.
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* @flag: one of the TAINT_* constants.
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* @lockdep_ok: whether lock debugging is still OK.
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*
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* If something bad has gone wrong, you'll want @lockdebug_ok = false, but for
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* some notewortht-but-not-corrupting cases, it can be set to true.
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*/
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void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
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{
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if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
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pr_warn("Disabling lock debugging due to kernel taint\n");
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set_bit(flag, &tainted_mask);
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if (tainted_mask & panic_on_taint) {
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panic_on_taint = 0;
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panic("panic_on_taint set ...");
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}
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}
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EXPORT_SYMBOL(add_taint);
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static void spin_msec(int msecs)
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{
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int i;
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for (i = 0; i < msecs; i++) {
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touch_nmi_watchdog();
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mdelay(1);
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}
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}
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/*
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* It just happens that oops_enter() and oops_exit() are identically
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* implemented...
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*/
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static void do_oops_enter_exit(void)
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{
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unsigned long flags;
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static int spin_counter;
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if (!pause_on_oops)
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return;
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spin_lock_irqsave(&pause_on_oops_lock, flags);
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if (pause_on_oops_flag == 0) {
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/* This CPU may now print the oops message */
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pause_on_oops_flag = 1;
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} else {
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/* We need to stall this CPU */
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if (!spin_counter) {
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/* This CPU gets to do the counting */
|
|
spin_counter = pause_on_oops;
|
|
do {
|
|
spin_unlock(&pause_on_oops_lock);
|
|
spin_msec(MSEC_PER_SEC);
|
|
spin_lock(&pause_on_oops_lock);
|
|
} while (--spin_counter);
|
|
pause_on_oops_flag = 0;
|
|
} else {
|
|
/* This CPU waits for a different one */
|
|
while (spin_counter) {
|
|
spin_unlock(&pause_on_oops_lock);
|
|
spin_msec(1);
|
|
spin_lock(&pause_on_oops_lock);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&pause_on_oops_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Return true if the calling CPU is allowed to print oops-related info.
|
|
* This is a bit racy..
|
|
*/
|
|
bool oops_may_print(void)
|
|
{
|
|
return pause_on_oops_flag == 0;
|
|
}
|
|
|
|
/*
|
|
* Called when the architecture enters its oops handler, before it prints
|
|
* anything. If this is the first CPU to oops, and it's oopsing the first
|
|
* time then let it proceed.
|
|
*
|
|
* This is all enabled by the pause_on_oops kernel boot option. We do all
|
|
* this to ensure that oopses don't scroll off the screen. It has the
|
|
* side-effect of preventing later-oopsing CPUs from mucking up the display,
|
|
* too.
|
|
*
|
|
* It turns out that the CPU which is allowed to print ends up pausing for
|
|
* the right duration, whereas all the other CPUs pause for twice as long:
|
|
* once in oops_enter(), once in oops_exit().
|
|
*/
|
|
void oops_enter(void)
|
|
{
|
|
tracing_off();
|
|
/* can't trust the integrity of the kernel anymore: */
|
|
debug_locks_off();
|
|
do_oops_enter_exit();
|
|
|
|
if (sysctl_oops_all_cpu_backtrace)
|
|
trigger_all_cpu_backtrace();
|
|
}
|
|
|
|
static void print_oops_end_marker(void)
|
|
{
|
|
pr_warn("---[ end trace %016llx ]---\n", 0ULL);
|
|
}
|
|
|
|
/*
|
|
* Called when the architecture exits its oops handler, after printing
|
|
* everything.
|
|
*/
|
|
void oops_exit(void)
|
|
{
|
|
do_oops_enter_exit();
|
|
print_oops_end_marker();
|
|
kmsg_dump(KMSG_DUMP_OOPS);
|
|
}
|
|
|
|
struct warn_args {
|
|
const char *fmt;
|
|
va_list args;
|
|
};
|
|
|
|
void __warn(const char *file, int line, void *caller, unsigned taint,
|
|
struct pt_regs *regs, struct warn_args *args)
|
|
{
|
|
disable_trace_on_warning();
|
|
|
|
if (file)
|
|
pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS\n",
|
|
raw_smp_processor_id(), current->pid, file, line,
|
|
caller);
|
|
else
|
|
pr_warn("WARNING: CPU: %d PID: %d at %pS\n",
|
|
raw_smp_processor_id(), current->pid, caller);
|
|
|
|
if (args)
|
|
vprintk(args->fmt, args->args);
|
|
|
|
print_modules();
|
|
|
|
if (regs)
|
|
show_regs(regs);
|
|
|
|
if (panic_on_warn) {
|
|
/*
|
|
* This thread may hit another WARN() in the panic path.
|
|
* Resetting this prevents additional WARN() from panicking the
|
|
* system on this thread. Other threads are blocked by the
|
|
* panic_mutex in panic().
|
|
*/
|
|
panic_on_warn = 0;
|
|
panic("panic_on_warn set ...\n");
|
|
}
|
|
|
|
if (!regs)
|
|
dump_stack();
|
|
|
|
print_irqtrace_events(current);
|
|
|
|
print_oops_end_marker();
|
|
trace_error_report_end(ERROR_DETECTOR_WARN, (unsigned long)caller);
|
|
|
|
/* Just a warning, don't kill lockdep. */
|
|
add_taint(taint, LOCKDEP_STILL_OK);
|
|
}
|
|
|
|
#ifndef __WARN_FLAGS
|
|
void warn_slowpath_fmt(const char *file, int line, unsigned taint,
|
|
const char *fmt, ...)
|
|
{
|
|
struct warn_args args;
|
|
|
|
pr_warn(CUT_HERE);
|
|
|
|
if (!fmt) {
|
|
__warn(file, line, __builtin_return_address(0), taint,
|
|
NULL, NULL);
|
|
return;
|
|
}
|
|
|
|
args.fmt = fmt;
|
|
va_start(args.args, fmt);
|
|
__warn(file, line, __builtin_return_address(0), taint, NULL, &args);
|
|
va_end(args.args);
|
|
}
|
|
EXPORT_SYMBOL(warn_slowpath_fmt);
|
|
#else
|
|
void __warn_printk(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
pr_warn(CUT_HERE);
|
|
|
|
va_start(args, fmt);
|
|
vprintk(fmt, args);
|
|
va_end(args);
|
|
}
|
|
EXPORT_SYMBOL(__warn_printk);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BUG
|
|
|
|
/* Support resetting WARN*_ONCE state */
|
|
|
|
static int clear_warn_once_set(void *data, u64 val)
|
|
{
|
|
generic_bug_clear_once();
|
|
memset(__start_once, 0, __end_once - __start_once);
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set,
|
|
"%lld\n");
|
|
|
|
static __init int register_warn_debugfs(void)
|
|
{
|
|
/* Don't care about failure */
|
|
debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL,
|
|
&clear_warn_once_fops);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(register_warn_debugfs);
|
|
#endif
|
|
|
|
#ifdef CONFIG_STACKPROTECTOR
|
|
|
|
/*
|
|
* Called when gcc's -fstack-protector feature is used, and
|
|
* gcc detects corruption of the on-stack canary value
|
|
*/
|
|
__visible noinstr void __stack_chk_fail(void)
|
|
{
|
|
instrumentation_begin();
|
|
panic("stack-protector: Kernel stack is corrupted in: %pB",
|
|
__builtin_return_address(0));
|
|
instrumentation_end();
|
|
}
|
|
EXPORT_SYMBOL(__stack_chk_fail);
|
|
|
|
#endif
|
|
|
|
core_param(panic, panic_timeout, int, 0644);
|
|
core_param(panic_print, panic_print, ulong, 0644);
|
|
core_param(pause_on_oops, pause_on_oops, int, 0644);
|
|
core_param(panic_on_warn, panic_on_warn, int, 0644);
|
|
core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644);
|
|
|
|
static int __init oops_setup(char *s)
|
|
{
|
|
if (!s)
|
|
return -EINVAL;
|
|
if (!strcmp(s, "panic"))
|
|
panic_on_oops = 1;
|
|
return 0;
|
|
}
|
|
early_param("oops", oops_setup);
|
|
|
|
static int __init panic_on_taint_setup(char *s)
|
|
{
|
|
char *taint_str;
|
|
|
|
if (!s)
|
|
return -EINVAL;
|
|
|
|
taint_str = strsep(&s, ",");
|
|
if (kstrtoul(taint_str, 16, &panic_on_taint))
|
|
return -EINVAL;
|
|
|
|
/* make sure panic_on_taint doesn't hold out-of-range TAINT flags */
|
|
panic_on_taint &= TAINT_FLAGS_MAX;
|
|
|
|
if (!panic_on_taint)
|
|
return -EINVAL;
|
|
|
|
if (s && !strcmp(s, "nousertaint"))
|
|
panic_on_taint_nousertaint = true;
|
|
|
|
pr_info("panic_on_taint: bitmask=0x%lx nousertaint_mode=%sabled\n",
|
|
panic_on_taint, panic_on_taint_nousertaint ? "en" : "dis");
|
|
|
|
return 0;
|
|
}
|
|
early_param("panic_on_taint", panic_on_taint_setup);
|