Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/panic.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * This function is used through-out the kernel (including mm and fs) |
| 9 | * to indicate a major problem. |
| 10 | */ |
Andrew Morton | 657b301 | 2006-08-13 23:24:19 -0700 | [diff] [blame] | 11 | #include <linux/debug_locks.h> |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 12 | #include <linux/interrupt.h> |
Simon Kagstrom | 456b565 | 2009-10-16 14:09:18 +0200 | [diff] [blame] | 13 | #include <linux/kmsg_dump.h> |
Arjan van de Ven | 79b4cc5 | 2008-01-30 13:32:50 +0100 | [diff] [blame] | 14 | #include <linux/kallsyms.h> |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 15 | #include <linux/notifier.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/random.h> |
| 18 | #include <linux/reboot.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/kexec.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/sysrq.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/nmi.h> |
Arjan van de Ven | bd89bb2 | 2008-11-28 08:36:09 -0800 | [diff] [blame] | 25 | #include <linux/dmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | int panic_on_oops; |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 28 | static unsigned long tainted_mask; |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 29 | static int pause_on_oops; |
| 30 | static int pause_on_oops_flag; |
| 31 | static DEFINE_SPINLOCK(pause_on_oops_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 33 | int panic_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 35 | ATOMIC_NOTIFIER_HEAD(panic_notifier_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | EXPORT_SYMBOL(panic_notifier_list); |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | static long no_blink(long time) |
| 40 | { |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | /* Returns how long it waited in ms */ |
| 45 | long (*panic_blink)(long time); |
| 46 | EXPORT_SYMBOL(panic_blink); |
| 47 | |
| 48 | /** |
| 49 | * panic - halt the system |
| 50 | * @fmt: The text string to print |
| 51 | * |
| 52 | * Display a message, then perform cleanups. |
| 53 | * |
| 54 | * This function never returns. |
| 55 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | NORET_TYPE void panic(const char * fmt, ...) |
| 57 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | static char buf[1024]; |
| 59 | va_list args; |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 60 | long i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 62 | /* |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 63 | * It's possible to come here directly from a panic-assertion and |
| 64 | * not have preempt disabled. Some functions called from here want |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 65 | * preempt to be disabled. No point enabling it later though... |
| 66 | */ |
| 67 | preempt_disable(); |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | bust_spinlocks(1); |
| 70 | va_start(args, fmt); |
| 71 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 72 | va_end(args); |
| 73 | printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf); |
Ingo Molnar | 5cb2730 | 2008-02-14 09:07:01 +0100 | [diff] [blame] | 74 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
| 75 | dump_stack(); |
| 76 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 78 | /* |
| 79 | * If we have crashed and we have a crash kernel loaded let it handle |
| 80 | * everything else. |
| 81 | * Do we want to call this before we try to display a message? |
| 82 | */ |
Alexander Nyberg | 6e274d1 | 2005-06-25 14:58:26 -0700 | [diff] [blame] | 83 | crash_kexec(NULL); |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 84 | |
KOSAKI Motohiro | 0f4bd46 | 2009-12-22 03:15:43 +0000 | [diff] [blame] | 85 | kmsg_dump(KMSG_DUMP_PANIC); |
| 86 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 87 | /* |
| 88 | * Note smp_send_stop is the usual smp shutdown function, which |
| 89 | * unfortunately means it may not be hardened to work in a panic |
| 90 | * situation. |
| 91 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | smp_send_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 94 | atomic_notifier_call_chain(&panic_notifier_list, 0, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Aaro Koskinen | d014e889 | 2009-10-02 14:41:20 +0300 | [diff] [blame] | 96 | bust_spinlocks(0); |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | if (!panic_blink) |
| 99 | panic_blink = no_blink; |
| 100 | |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 101 | if (panic_timeout > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | /* |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 103 | * Delay timeout seconds before rebooting the machine. |
| 104 | * We can't use the "normal" timers since we just panicked. |
| 105 | */ |
| 106 | printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout); |
| 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | for (i = 0; i < panic_timeout*1000; ) { |
| 109 | touch_nmi_watchdog(); |
| 110 | i += panic_blink(i); |
| 111 | mdelay(1); |
| 112 | i++; |
| 113 | } |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 114 | /* |
| 115 | * This will not be a clean reboot, with everything |
| 116 | * shutting down. But if there is a chance of |
| 117 | * rebooting the system it will be rebooted. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | */ |
Eric W. Biederman | 2f048ea | 2005-07-26 11:49:23 -0600 | [diff] [blame] | 119 | emergency_restart(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | #ifdef __sparc__ |
| 122 | { |
| 123 | extern int stop_a_enabled; |
Tom 'spot' Callaway | a271c24 | 2005-04-24 20:38:02 -0700 | [diff] [blame] | 124 | /* Make sure the user can actually press Stop-A (L1-A) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | stop_a_enabled = 1; |
Tom 'spot' Callaway | a271c24 | 2005-04-24 20:38:02 -0700 | [diff] [blame] | 126 | printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
| 128 | #endif |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 129 | #if defined(CONFIG_S390) |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 130 | { |
| 131 | unsigned long caller; |
| 132 | |
| 133 | caller = (unsigned long)__builtin_return_address(0); |
| 134 | disabled_wait(caller); |
| 135 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | #endif |
| 137 | local_irq_enable(); |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 138 | for (i = 0; ; ) { |
Jan Beulich | c22db94 | 2006-02-10 01:51:11 -0800 | [diff] [blame] | 139 | touch_softlockup_watchdog(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | i += panic_blink(i); |
| 141 | mdelay(1); |
| 142 | i++; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | EXPORT_SYMBOL(panic); |
| 147 | |
Daniel Walker | c277e63 | 2007-10-18 03:06:08 -0700 | [diff] [blame] | 148 | |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 149 | struct tnt { |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 150 | u8 bit; |
| 151 | char true; |
| 152 | char false; |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 153 | }; |
| 154 | |
| 155 | static const struct tnt tnts[] = { |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 156 | { TAINT_PROPRIETARY_MODULE, 'P', 'G' }, |
| 157 | { TAINT_FORCED_MODULE, 'F', ' ' }, |
| 158 | { TAINT_UNSAFE_SMP, 'S', ' ' }, |
| 159 | { TAINT_FORCED_RMMOD, 'R', ' ' }, |
| 160 | { TAINT_MACHINE_CHECK, 'M', ' ' }, |
| 161 | { TAINT_BAD_PAGE, 'B', ' ' }, |
| 162 | { TAINT_USER, 'U', ' ' }, |
| 163 | { TAINT_DIE, 'D', ' ' }, |
| 164 | { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' }, |
| 165 | { TAINT_WARN, 'W', ' ' }, |
| 166 | { TAINT_CRAP, 'C', ' ' }, |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 167 | }; |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | /** |
| 170 | * print_tainted - return a string to represent the kernel taint state. |
| 171 | * |
| 172 | * 'P' - Proprietary module has been loaded. |
| 173 | * 'F' - Module has been forcibly loaded. |
| 174 | * 'S' - SMP with CPUs not designed for SMP. |
| 175 | * 'R' - User forced a module unload. |
| 176 | * 'M' - System experienced a machine check exception. |
| 177 | * 'B' - System has hit bad_page. |
| 178 | * 'U' - Userspace-defined naughtiness. |
Arjan van de Ven | a800599 | 2008-12-01 13:14:00 -0800 | [diff] [blame] | 179 | * 'D' - Kernel has oopsed before |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | * 'A' - ACPI table overridden. |
Theodore Ts'o | 34f5a39 | 2007-02-10 01:45:24 -0800 | [diff] [blame] | 181 | * 'W' - Taint on warning. |
Greg Kroah-Hartman | 061b1bd | 2008-09-24 14:46:44 -0700 | [diff] [blame] | 182 | * 'C' - modules from drivers/staging are loaded. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | * |
Robert P. J. Day | fe002a4 | 2009-06-28 21:10:07 -0400 | [diff] [blame] | 184 | * The string is overwritten by the next call to print_tainted(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | const char *print_tainted(void) |
| 187 | { |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 188 | static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1]; |
| 189 | |
| 190 | if (tainted_mask) { |
| 191 | char *s; |
| 192 | int i; |
| 193 | |
| 194 | s = buf + sprintf(buf, "Tainted: "); |
| 195 | for (i = 0; i < ARRAY_SIZE(tnts); i++) { |
| 196 | const struct tnt *t = &tnts[i]; |
| 197 | *s++ = test_bit(t->bit, &tainted_mask) ? |
| 198 | t->true : t->false; |
| 199 | } |
| 200 | *s = 0; |
| 201 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | snprintf(buf, sizeof(buf), "Not tainted"); |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 203 | |
| 204 | return buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 207 | int test_taint(unsigned flag) |
| 208 | { |
| 209 | return test_bit(flag, &tainted_mask); |
| 210 | } |
| 211 | EXPORT_SYMBOL(test_taint); |
| 212 | |
| 213 | unsigned long get_taint(void) |
| 214 | { |
| 215 | return tainted_mask; |
| 216 | } |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | void add_taint(unsigned flag) |
| 219 | { |
Frederic Weisbecker | 9eeba61 | 2009-04-11 03:17:17 +0200 | [diff] [blame] | 220 | /* |
| 221 | * Can't trust the integrity of the kernel anymore. |
| 222 | * We don't call directly debug_locks_off() because the issue |
| 223 | * is not necessarily serious enough to set oops_in_progress to 1 |
Frederic Weisbecker | 574bbe7 | 2009-04-11 03:17:18 +0200 | [diff] [blame] | 224 | * Also we want to keep up lockdep for staging development and |
| 225 | * post-warning case. |
Frederic Weisbecker | 9eeba61 | 2009-04-11 03:17:17 +0200 | [diff] [blame] | 226 | */ |
Frederic Weisbecker | 574bbe7 | 2009-04-11 03:17:18 +0200 | [diff] [blame] | 227 | if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off()) |
Ingo Molnar | b48ccb09 | 2009-04-23 09:36:52 +0200 | [diff] [blame] | 228 | printk(KERN_WARNING "Disabling lock debugging due to kernel taint\n"); |
Frederic Weisbecker | 9eeba61 | 2009-04-11 03:17:17 +0200 | [diff] [blame] | 229 | |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 230 | set_bit(flag, &tainted_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | EXPORT_SYMBOL(add_taint); |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 233 | |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 234 | static void spin_msec(int msecs) |
| 235 | { |
| 236 | int i; |
| 237 | |
| 238 | for (i = 0; i < msecs; i++) { |
| 239 | touch_nmi_watchdog(); |
| 240 | mdelay(1); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * It just happens that oops_enter() and oops_exit() are identically |
| 246 | * implemented... |
| 247 | */ |
| 248 | static void do_oops_enter_exit(void) |
| 249 | { |
| 250 | unsigned long flags; |
| 251 | static int spin_counter; |
| 252 | |
| 253 | if (!pause_on_oops) |
| 254 | return; |
| 255 | |
| 256 | spin_lock_irqsave(&pause_on_oops_lock, flags); |
| 257 | if (pause_on_oops_flag == 0) { |
| 258 | /* This CPU may now print the oops message */ |
| 259 | pause_on_oops_flag = 1; |
| 260 | } else { |
| 261 | /* We need to stall this CPU */ |
| 262 | if (!spin_counter) { |
| 263 | /* This CPU gets to do the counting */ |
| 264 | spin_counter = pause_on_oops; |
| 265 | do { |
| 266 | spin_unlock(&pause_on_oops_lock); |
| 267 | spin_msec(MSEC_PER_SEC); |
| 268 | spin_lock(&pause_on_oops_lock); |
| 269 | } while (--spin_counter); |
| 270 | pause_on_oops_flag = 0; |
| 271 | } else { |
| 272 | /* This CPU waits for a different one */ |
| 273 | while (spin_counter) { |
| 274 | spin_unlock(&pause_on_oops_lock); |
| 275 | spin_msec(1); |
| 276 | spin_lock(&pause_on_oops_lock); |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | spin_unlock_irqrestore(&pause_on_oops_lock, flags); |
| 281 | } |
| 282 | |
| 283 | /* |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 284 | * Return true if the calling CPU is allowed to print oops-related info. |
| 285 | * This is a bit racy.. |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 286 | */ |
| 287 | int oops_may_print(void) |
| 288 | { |
| 289 | return pause_on_oops_flag == 0; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Called when the architecture enters its oops handler, before it prints |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 294 | * anything. If this is the first CPU to oops, and it's oopsing the first |
| 295 | * time then let it proceed. |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 296 | * |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 297 | * This is all enabled by the pause_on_oops kernel boot option. We do all |
| 298 | * this to ensure that oopses don't scroll off the screen. It has the |
| 299 | * side-effect of preventing later-oopsing CPUs from mucking up the display, |
| 300 | * too. |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 301 | * |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 302 | * It turns out that the CPU which is allowed to print ends up pausing for |
| 303 | * the right duration, whereas all the other CPUs pause for twice as long: |
| 304 | * once in oops_enter(), once in oops_exit(). |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 305 | */ |
| 306 | void oops_enter(void) |
| 307 | { |
Thomas Gleixner | bdff787 | 2009-07-24 15:30:45 -0400 | [diff] [blame] | 308 | tracing_off(); |
Ingo Molnar | c95dbf27 | 2009-03-13 11:14:06 +0100 | [diff] [blame] | 309 | /* can't trust the integrity of the kernel anymore: */ |
| 310 | debug_locks_off(); |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 311 | do_oops_enter_exit(); |
| 312 | } |
| 313 | |
| 314 | /* |
Arjan van de Ven | 2c3b20e9 | 2007-12-20 15:01:17 +0100 | [diff] [blame] | 315 | * 64-bit random ID for oopses: |
| 316 | */ |
| 317 | static u64 oops_id; |
| 318 | |
| 319 | static int init_oops_id(void) |
| 320 | { |
| 321 | if (!oops_id) |
| 322 | get_random_bytes(&oops_id, sizeof(oops_id)); |
Arjan van de Ven | d6624f9 | 2009-01-06 14:40:54 -0800 | [diff] [blame] | 323 | else |
| 324 | oops_id++; |
Arjan van de Ven | 2c3b20e9 | 2007-12-20 15:01:17 +0100 | [diff] [blame] | 325 | |
| 326 | return 0; |
| 327 | } |
| 328 | late_initcall(init_oops_id); |
| 329 | |
Arjan van de Ven | 71c3391 | 2008-01-30 13:32:50 +0100 | [diff] [blame] | 330 | static void print_oops_end_marker(void) |
| 331 | { |
| 332 | init_oops_id(); |
| 333 | printk(KERN_WARNING "---[ end trace %016llx ]---\n", |
| 334 | (unsigned long long)oops_id); |
| 335 | } |
| 336 | |
Arjan van de Ven | 2c3b20e9 | 2007-12-20 15:01:17 +0100 | [diff] [blame] | 337 | /* |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 338 | * Called when the architecture exits its oops handler, after printing |
| 339 | * everything. |
| 340 | */ |
| 341 | void oops_exit(void) |
| 342 | { |
| 343 | do_oops_enter_exit(); |
Arjan van de Ven | 71c3391 | 2008-01-30 13:32:50 +0100 | [diff] [blame] | 344 | print_oops_end_marker(); |
Simon Kagstrom | 456b565 | 2009-10-16 14:09:18 +0200 | [diff] [blame] | 345 | kmsg_dump(KMSG_DUMP_OOPS); |
Andrew Morton | dd28779 | 2006-03-23 03:00:57 -0800 | [diff] [blame] | 346 | } |
Arjan van de Ven | 3162f75 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 347 | |
Arjan van de Ven | 79b4cc5 | 2008-01-30 13:32:50 +0100 | [diff] [blame] | 348 | #ifdef WANT_WARN_ON_SLOWPATH |
Linus Torvalds | 0f6f49a | 2009-05-16 13:41:28 -0700 | [diff] [blame] | 349 | struct slowpath_args { |
| 350 | const char *fmt; |
Arjan van de Ven | a8f18b9 | 2008-07-25 01:45:53 -0700 | [diff] [blame] | 351 | va_list args; |
Linus Torvalds | 0f6f49a | 2009-05-16 13:41:28 -0700 | [diff] [blame] | 352 | }; |
| 353 | |
| 354 | static void warn_slowpath_common(const char *file, int line, void *caller, struct slowpath_args *args) |
| 355 | { |
Arjan van de Ven | bd89bb2 | 2008-11-28 08:36:09 -0800 | [diff] [blame] | 356 | const char *board; |
| 357 | |
Arjan van de Ven | a8f18b9 | 2008-07-25 01:45:53 -0700 | [diff] [blame] | 358 | printk(KERN_WARNING "------------[ cut here ]------------\n"); |
Linus Torvalds | 0f6f49a | 2009-05-16 13:41:28 -0700 | [diff] [blame] | 359 | printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller); |
Arjan van de Ven | bd89bb2 | 2008-11-28 08:36:09 -0800 | [diff] [blame] | 360 | board = dmi_get_system_info(DMI_PRODUCT_NAME); |
| 361 | if (board) |
| 362 | printk(KERN_WARNING "Hardware name: %s\n", board); |
Arjan van de Ven | 74853db | 2008-11-28 08:35:25 -0800 | [diff] [blame] | 363 | |
Linus Torvalds | 0f6f49a | 2009-05-16 13:41:28 -0700 | [diff] [blame] | 364 | if (args) |
| 365 | vprintk(args->fmt, args->args); |
Arjan van de Ven | a8f18b9 | 2008-07-25 01:45:53 -0700 | [diff] [blame] | 366 | |
| 367 | print_modules(); |
| 368 | dump_stack(); |
| 369 | print_oops_end_marker(); |
| 370 | add_taint(TAINT_WARN); |
| 371 | } |
Linus Torvalds | 0f6f49a | 2009-05-16 13:41:28 -0700 | [diff] [blame] | 372 | |
| 373 | void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...) |
| 374 | { |
| 375 | struct slowpath_args args; |
| 376 | |
| 377 | args.fmt = fmt; |
| 378 | va_start(args.args, fmt); |
| 379 | warn_slowpath_common(file, line, __builtin_return_address(0), &args); |
| 380 | va_end(args.args); |
| 381 | } |
Andi Kleen | 57adc4d | 2009-05-06 16:02:53 -0700 | [diff] [blame] | 382 | EXPORT_SYMBOL(warn_slowpath_fmt); |
| 383 | |
| 384 | void warn_slowpath_null(const char *file, int line) |
| 385 | { |
Linus Torvalds | 0f6f49a | 2009-05-16 13:41:28 -0700 | [diff] [blame] | 386 | warn_slowpath_common(file, line, __builtin_return_address(0), NULL); |
Andi Kleen | 57adc4d | 2009-05-06 16:02:53 -0700 | [diff] [blame] | 387 | } |
| 388 | EXPORT_SYMBOL(warn_slowpath_null); |
Arjan van de Ven | 79b4cc5 | 2008-01-30 13:32:50 +0100 | [diff] [blame] | 389 | #endif |
| 390 | |
Arjan van de Ven | 3162f75 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 391 | #ifdef CONFIG_CC_STACKPROTECTOR |
Arjan van de Ven | 54371a4 | 2008-02-15 15:33:12 -0800 | [diff] [blame] | 392 | |
Arjan van de Ven | 3162f75 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 393 | /* |
| 394 | * Called when gcc's -fstack-protector feature is used, and |
| 395 | * gcc detects corruption of the on-stack canary value |
| 396 | */ |
| 397 | void __stack_chk_fail(void) |
| 398 | { |
Ingo Molnar | 517a92c | 2008-02-14 09:02:13 +0100 | [diff] [blame] | 399 | panic("stack-protector: Kernel stack is corrupted in: %p\n", |
| 400 | __builtin_return_address(0)); |
Arjan van de Ven | 3162f75 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 401 | } |
| 402 | EXPORT_SYMBOL(__stack_chk_fail); |
Arjan van de Ven | 54371a4 | 2008-02-15 15:33:12 -0800 | [diff] [blame] | 403 | |
Arjan van de Ven | 3162f75 | 2006-09-26 10:52:39 +0200 | [diff] [blame] | 404 | #endif |
Rusty Russell | f44dd16 | 2008-10-22 10:00:24 -0500 | [diff] [blame] | 405 | |
| 406 | core_param(panic, panic_timeout, int, 0644); |
| 407 | core_param(pause_on_oops, pause_on_oops, int, 0644); |