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kernel/panic.c
18.3 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * linux/kernel/panic.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * This function is used through-out the kernel (including mm and fs) * to indicate a major problem. */ |
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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> #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> #include <linux/kexec.h> #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> #include <asm/sections.h> |
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|
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#define PANIC_TIMER_STEP 100 #define PANIC_BLINK_SPD 18 |
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#ifdef CONFIG_SMP /* * Should we dump all CPUs backtraces in an oops event? * Defaults to 0, can be changed via sysctl. */ unsigned int __read_mostly sysctl_oops_all_cpu_backtrace; #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 = IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0; |
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static int pause_on_oops; static int pause_on_oops_flag; 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; bool panic_on_taint_nousertaint = false; |
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|
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int panic_timeout = CONFIG_PANIC_TIMEOUT; |
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EXPORT_SYMBOL_GPL(panic_timeout); |
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|
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#define PANIC_PRINT_TASK_INFO 0x00000001 #define PANIC_PRINT_MEM_INFO 0x00000002 #define PANIC_PRINT_TIMER_INFO 0x00000004 #define PANIC_PRINT_LOCK_INFO 0x00000008 #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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|
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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 */ long (*panic_blink)(int state); EXPORT_SYMBOL(panic_blink); |
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/* * Stop ourself in panic -- architecture code may override this */ void __weak panic_smp_self_stop(void) { while (1) cpu_relax(); } |
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/* * Stop ourselves in NMI context if another CPU has already panicked. Arch code * may override this to prepare for crash dumping, e.g. save regs info. */ void __weak nmi_panic_self_stop(struct pt_regs *regs) { panic_smp_self_stop(); } |
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/* * Stop other CPUs in panic. Architecture dependent code may override this * with more suitable version. For example, if the architecture supports * crash dump, it should save registers of each stopped CPU and disable * per-CPU features such as virtualization extensions. */ void __weak crash_smp_send_stop(void) { static int cpus_stopped; /* * This function can be called twice in panic path, but obviously * we execute this only once. */ if (cpus_stopped) return; /* * Note smp_send_stop is the usual smp shutdown function, which * unfortunately means it may not be hardened to work in a panic * situation. */ smp_send_stop(); cpus_stopped = 1; } |
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atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID); |
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/* * A variant of panic() called from NMI context. We return if we've already * panicked on this CPU. If another CPU already panicked, loop in * nmi_panic_self_stop() which can provide architecture dependent code such * as saving register state for crash dump. */ void nmi_panic(struct pt_regs *regs, const char *msg) { int old_cpu, cpu; cpu = raw_smp_processor_id(); old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu); if (old_cpu == PANIC_CPU_INVALID) panic("%s", msg); else if (old_cpu != cpu) nmi_panic_self_stop(regs); } EXPORT_SYMBOL(nmi_panic); |
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static void panic_print_sys_info(void) { |
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if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG) console_flush_on_panic(CONSOLE_REPLAY_ALL); |
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if (panic_print & PANIC_PRINT_TASK_INFO) show_state(); if (panic_print & PANIC_PRINT_MEM_INFO) show_mem(0, NULL); if (panic_print & PANIC_PRINT_TIMER_INFO) sysrq_timer_list_show(); if (panic_print & PANIC_PRINT_LOCK_INFO) debug_show_all_locks(); if (panic_print & PANIC_PRINT_FTRACE_INFO) ftrace_dump(DUMP_ALL); } |
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/** * panic - halt the system * @fmt: The text string to print * * Display a message, then perform cleanups. * * This function never returns. */ |
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void panic(const char *fmt, ...) |
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{ |
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static char buf[1024]; 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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/* |
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* Disable local interrupts. This will prevent panic_smp_self_stop * from deadlocking the first cpu that invokes the panic, since * 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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*/ 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 * 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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* * Only one CPU is allowed to execute the panic code from here. For * multiple parallel invocations of panic, all other CPUs either * stop themself or will wait until they are stopped by the 1st CPU * with smp_send_stop(). |
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* * `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which * comes here, so go ahead. * `old_cpu == this_cpu' means we came from nmi_panic() which sets * 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(); old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu); if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu) |
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panic_smp_self_stop(); |
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|
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console_verbose(); |
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bust_spinlocks(1); 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] == ' ') buf[len - 1] = '\0'; |
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pr_emerg("Kernel panic - not syncing: %s ", buf); |
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#ifdef CONFIG_DEBUG_BUGVERBOSE |
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/* * Avoid nested stack-dumping if a panic occurs during oops processing */ |
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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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/* |
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* If kgdb is enabled, give it a chance to run before we stop all * the other CPUs or else we won't be able to debug processes left * running on them. */ kgdb_panic(buf); /* |
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* If we have crashed and we have a crash kernel loaded let it handle * everything else. |
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* If we want to run this after calling panic_notifiers, pass * the "crash_kexec_post_notifiers" option to the kernel. |
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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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printk_safe_flush_on_panic(); |
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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 * unfortunately means it may not be hardened to work in a * panic situation. */ smp_send_stop(); } else { /* * If we want to do crash dump after notifier calls and * kmsg_dump, we will need architecture dependent extra * works in addition to stopping other CPUs. */ crash_smp_send_stop(); } |
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|
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/* * Run any panic handlers, including those that might need to * add information to the kmsg dump output. */ |
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atomic_notifier_call_chain(&panic_notifier_list, 0, buf); |
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|
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/* Call flush even twice. It tries harder with a single online CPU */ |
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printk_safe_flush_on_panic(); |
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kmsg_dump(KMSG_DUMP_PANIC); |
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/* * If you doubt kdump always works fine in any situation, * "crash_kexec_post_notifiers" offers you a chance to run * panic_notifiers and dumping kmsg before kdump. * Note: since some panic_notifiers can make crashed kernel * more unstable, it can increase risks of the kdump failure too. |
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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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#ifdef CONFIG_VT unblank_screen(); #endif console_unblank(); |
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/* * We may have ended up stopping the CPU holding the lock (in * smp_send_stop()) while still having some valuable data in the console * 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 * should be disabled to avoid reporting bad unlock balance when * 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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|
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panic_print_sys_info(); |
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if (!panic_blink) 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. * We can't use the "normal" timers since we just panicked. */ |
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pr_emerg("Rebooting in %d seconds.. ", panic_timeout); |
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|
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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) { i += panic_blink(state ^= 1); i_next = i + 3600 / PANIC_BLINK_SPD; } mdelay(PANIC_TIMER_STEP); |
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} |
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} if (panic_timeout != 0) { |
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/* * This will not be a clean reboot, with everything * shutting down. But if there is a chance of * rebooting the system it will be rebooted. |
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*/ |
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if (panic_reboot_mode != REBOOT_UNDEFINED) reboot_mode = panic_reboot_mode; |
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emergency_restart(); |
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} #ifdef __sparc__ { 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 " "twice on console to return to the boot prom "); |
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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 ]--- ", buf); |
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/* Do not scroll important messages printed above */ 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) { i += panic_blink(state ^= 1); i_next = i + 3600 / PANIC_BLINK_SPD; } mdelay(PANIC_TIMER_STEP); |
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} } EXPORT_SYMBOL(panic); |
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/* * TAINT_FORCED_RMMOD could be a per-module flag but the module * is being removed anyway. */ const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = { |
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[ TAINT_PROPRIETARY_MODULE ] = { 'P', 'G', true }, [ TAINT_FORCED_MODULE ] = { 'F', ' ', true }, [ TAINT_CPU_OUT_OF_SPEC ] = { 'S', ' ', false }, [ TAINT_FORCED_RMMOD ] = { 'R', ' ', false }, [ TAINT_MACHINE_CHECK ] = { 'M', ' ', false }, [ TAINT_BAD_PAGE ] = { 'B', ' ', false }, [ TAINT_USER ] = { 'U', ' ', false }, [ TAINT_DIE ] = { 'D', ' ', false }, [ TAINT_OVERRIDDEN_ACPI_TABLE ] = { 'A', ' ', false }, [ TAINT_WARN ] = { 'W', ' ', false }, [ TAINT_CRAP ] = { 'C', ' ', true }, [ TAINT_FIRMWARE_WORKAROUND ] = { 'I', ' ', false }, [ TAINT_OOT_MODULE ] = { 'O', ' ', true }, [ TAINT_UNSIGNED_MODULE ] = { 'E', ' ', true }, [ TAINT_SOFTLOCKUP ] = { 'L', ' ', false }, [ TAINT_LIVEPATCH ] = { 'K', ' ', true }, [ 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(), * but is always NULL terminated. |
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*/ |
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const char *print_tainted(void) { |
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static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")]; |
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|
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BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT); |
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if (tainted_mask) { char *s; int i; s = buf + sprintf(buf, "Tainted: "); |
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for (i = 0; i < TAINT_FLAGS_COUNT; i++) { const struct taint_flag *t = &taint_flags[i]; *s++ = test_bit(i, &tainted_mask) ? |
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t->c_true : t->c_false; |
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} *s = 0; } 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); } EXPORT_SYMBOL(test_taint); unsigned long get_taint(void) { 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. * @flag: one of the TAINT_* constants. * @lockdep_ok: whether lock debugging is still OK. * * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for * some notewortht-but-not-corrupting cases, it can be set to true. */ void add_taint(unsigned flag, enum lockdep_ok lockdep_ok) |
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{ |
373d4d099 taint: add explic... |
429 |
if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off()) |
d7c0847fe kernel/panic.c: d... |
430 431 |
pr_warn("Disabling lock debugging due to kernel taint "); |
9eeba6138 lockdep: warn abo... |
432 |
|
25ddbb18a Make the taint fl... |
433 |
set_bit(flag, &tainted_mask); |
db38d5c10 kernel: add panic... |
434 435 436 437 438 |
if (tainted_mask & panic_on_taint) { panic_on_taint = 0; panic("panic_on_taint set ..."); } |
dd287796d [PATCH] pause_on_... |
439 |
} |
1da177e4c Linux-2.6.12-rc2 |
440 |
EXPORT_SYMBOL(add_taint); |
dd287796d [PATCH] pause_on_... |
441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 |
static void spin_msec(int msecs) { int i; for (i = 0; i < msecs; i++) { touch_nmi_watchdog(); mdelay(1); } } /* * It just happens that oops_enter() and oops_exit() are identically * implemented... */ static void do_oops_enter_exit(void) { unsigned long flags; static int spin_counter; if (!pause_on_oops) return; spin_lock_irqsave(&pause_on_oops_lock, flags); if (pause_on_oops_flag == 0) { /* This CPU may now print the oops message */ pause_on_oops_flag = 1; } else { /* We need to stall this CPU */ if (!spin_counter) { /* 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); } /* |
c95dbf27e panic: clean up k... |
492 493 |
* Return true if the calling CPU is allowed to print oops-related info. * This is a bit racy.. |
dd287796d [PATCH] pause_on_... |
494 |
*/ |
79076e124 kernel/panic.c: m... |
495 |
bool oops_may_print(void) |
dd287796d [PATCH] pause_on_... |
496 497 498 499 500 501 |
{ return pause_on_oops_flag == 0; } /* * Called when the architecture enters its oops handler, before it prints |
c95dbf27e panic: clean up k... |
502 503 |
* anything. If this is the first CPU to oops, and it's oopsing the first * time then let it proceed. |
dd287796d [PATCH] pause_on_... |
504 |
* |
c95dbf27e panic: clean up k... |
505 506 507 508 |
* 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. |
dd287796d [PATCH] pause_on_... |
509 |
* |
c95dbf27e panic: clean up k... |
510 511 512 |
* 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(). |
dd287796d [PATCH] pause_on_... |
513 514 515 |
*/ void oops_enter(void) { |
bdff78707 trace: stop trace... |
516 |
tracing_off(); |
c95dbf27e panic: clean up k... |
517 518 |
/* can't trust the integrity of the kernel anymore: */ debug_locks_off(); |
dd287796d [PATCH] pause_on_... |
519 |
do_oops_enter_exit(); |
60c958d8d panic: add sysctl... |
520 521 522 |
if (sysctl_oops_all_cpu_backtrace) trigger_all_cpu_backtrace(); |
dd287796d [PATCH] pause_on_... |
523 524 525 |
} /* |
2c3b20e91 debug: add end-of... |
526 527 528 529 530 531 532 533 |
* 64-bit random ID for oopses: */ static u64 oops_id; static int init_oops_id(void) { if (!oops_id) get_random_bytes(&oops_id, sizeof(oops_id)); |
d6624f996 oops: increment t... |
534 535 |
else oops_id++; |
2c3b20e91 debug: add end-of... |
536 537 538 539 |
return 0; } late_initcall(init_oops_id); |
63037f747 panic: make print... |
540 |
static void print_oops_end_marker(void) |
71c339116 debug: add the en... |
541 542 |
{ init_oops_id(); |
d7c0847fe kernel/panic.c: d... |
543 544 |
pr_warn("---[ end trace %016llx ]--- ", (unsigned long long)oops_id); |
71c339116 debug: add the en... |
545 |
} |
2c3b20e91 debug: add end-of... |
546 |
/* |
dd287796d [PATCH] pause_on_... |
547 548 549 550 551 552 |
* Called when the architecture exits its oops handler, after printing * everything. */ void oops_exit(void) { do_oops_enter_exit(); |
71c339116 debug: add the en... |
553 |
print_oops_end_marker(); |
456b565cc core: Add kernel ... |
554 |
kmsg_dump(KMSG_DUMP_OOPS); |
dd287796d [PATCH] pause_on_... |
555 |
} |
3162f751d [PATCH] Add the _... |
556 |
|
2553b67a1 lib/bug.c: use co... |
557 |
struct warn_args { |
0f6f49a8c Fix caller inform... |
558 |
const char *fmt; |
a8f18b909 Add a WARN() macr... |
559 |
va_list args; |
0f6f49a8c Fix caller inform... |
560 |
}; |
bd89bb29a debug warnings: p... |
561 |
|
2553b67a1 lib/bug.c: use co... |
562 563 |
void __warn(const char *file, int line, void *caller, unsigned taint, struct pt_regs *regs, struct warn_args *args) |
0f6f49a8c Fix caller inform... |
564 |
{ |
de7edd314 tracing: Disable ... |
565 |
disable_trace_on_warning(); |
2553b67a1 lib/bug.c: use co... |
566 567 568 569 570 571 572 573 574 |
if (file) pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS ", raw_smp_processor_id(), current->pid, file, line, caller); else pr_warn("WARNING: CPU: %d PID: %d at %pS ", raw_smp_processor_id(), current->pid, caller); |
74853dba2 debug warnings: c... |
575 |
|
0f6f49a8c Fix caller inform... |
576 577 |
if (args) vprintk(args->fmt, args->args); |
a8f18b909 Add a WARN() macr... |
578 |
|
3f388f286 panic: dump regis... |
579 580 581 582 |
print_modules(); if (regs) show_regs(regs); |
9e3961a09 kernel: add panic... |
583 584 585 586 587 588 589 590 591 592 593 |
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 ... "); } |
2f31ad64a panic: don't dump... |
594 595 |
if (!regs) dump_stack(); |
2553b67a1 lib/bug.c: use co... |
596 |
|
4c281074d lockdep: Add prin... |
597 |
print_irqtrace_events(current); |
a8f18b909 Add a WARN() macr... |
598 |
print_oops_end_marker(); |
2553b67a1 lib/bug.c: use co... |
599 |
|
373d4d099 taint: add explic... |
600 601 |
/* Just a warning, don't kill lockdep. */ add_taint(taint, LOCKDEP_STILL_OK); |
a8f18b909 Add a WARN() macr... |
602 |
} |
0f6f49a8c Fix caller inform... |
603 |
|
2da1ead4d bug: consolidate ... |
604 |
#ifndef __WARN_FLAGS |
ee8711336 bug: refactor awa... |
605 606 |
void warn_slowpath_fmt(const char *file, int line, unsigned taint, const char *fmt, ...) |
b2be05273 panic: Allow warn... |
607 |
{ |
2553b67a1 lib/bug.c: use co... |
608 |
struct warn_args args; |
b2be05273 panic: Allow warn... |
609 |
|
d38aba49a bug: lift "cut he... |
610 |
pr_warn(CUT_HERE); |
f2f84b05e bug: consolidate ... |
611 |
if (!fmt) { |
f2f84b05e bug: consolidate ... |
612 613 614 615 |
__warn(file, line, __builtin_return_address(0), taint, NULL, NULL); return; } |
b2be05273 panic: Allow warn... |
616 617 |
args.fmt = fmt; va_start(args.args, fmt); |
2553b67a1 lib/bug.c: use co... |
618 |
__warn(file, line, __builtin_return_address(0), taint, NULL, &args); |
b2be05273 panic: Allow warn... |
619 620 |
va_end(args.args); } |
ee8711336 bug: refactor awa... |
621 |
EXPORT_SYMBOL(warn_slowpath_fmt); |
a7bed27af bug: fix "cut her... |
622 623 624 625 626 627 628 629 630 631 632 633 |
#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); |
79b4cc5ee debug: move WARN_... |
634 |
#endif |
b1fca27d3 kernel debug: sup... |
635 636 637 638 639 640 |
#ifdef CONFIG_BUG /* Support resetting WARN*_ONCE state */ static int clear_warn_once_set(void *data, u64 val) { |
aaf5dcfb2 kernel debug: sup... |
641 |
generic_bug_clear_once(); |
b1fca27d3 kernel debug: sup... |
642 643 644 |
memset(__start_once, 0, __end_once - __start_once); return 0; } |
4169680e9 kernel/panic.c: t... |
645 646 647 |
DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set, "%lld "); |
b1fca27d3 kernel debug: sup... |
648 649 650 651 |
static __init int register_warn_debugfs(void) { /* Don't care about failure */ |
4169680e9 kernel/panic.c: t... |
652 653 |
debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL, &clear_warn_once_fops); |
b1fca27d3 kernel debug: sup... |
654 655 656 657 658 |
return 0; } device_initcall(register_warn_debugfs); #endif |
050e9baa9 Kbuild: rename CC... |
659 |
#ifdef CONFIG_STACKPROTECTOR |
54371a43a x86: add CONFIG_C... |
660 |
|
3162f751d [PATCH] Add the _... |
661 662 663 664 |
/* * Called when gcc's -fstack-protector feature is used, and * gcc detects corruption of the on-stack canary value */ |
5916d5f9b bug: Annotate WAR... |
665 |
__visible noinstr void __stack_chk_fail(void) |
3162f751d [PATCH] Add the _... |
666 |
{ |
5916d5f9b bug: Annotate WAR... |
667 |
instrumentation_begin(); |
95c4fb78f kernel/panic.c: d... |
668 |
panic("stack-protector: Kernel stack is corrupted in: %pB", |
517a92c4e panic: print more... |
669 |
__builtin_return_address(0)); |
5916d5f9b bug: Annotate WAR... |
670 |
instrumentation_end(); |
3162f751d [PATCH] Add the _... |
671 672 |
} EXPORT_SYMBOL(__stack_chk_fail); |
54371a43a x86: add CONFIG_C... |
673 |
|
3162f751d [PATCH] Add the _... |
674 |
#endif |
f44dd164f Make panic= and p... |
675 676 |
core_param(panic, panic_timeout, int, 0644); |
d999bd939 panic: add option... |
677 |
core_param(panic_print, panic_print, ulong, 0644); |
f44dd164f Make panic= and p... |
678 |
core_param(pause_on_oops, pause_on_oops, int, 0644); |
9e3961a09 kernel: add panic... |
679 |
core_param(panic_on_warn, panic_on_warn, int, 0644); |
b26e27ddf kexec: use core_p... |
680 |
core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644); |
f06e5153f kernel/panic.c: a... |
681 |
|
d404ab0a1 move x86 specific... |
682 683 684 685 686 687 688 689 690 |
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); |
db38d5c10 kernel: add panic... |
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
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 ", panic_on_taint, panic_on_taint_nousertaint ? "en" : "dis"); return 0; } early_param("panic_on_taint", panic_on_taint_setup); |