Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | */ | |
c95dbf27 IM |
11 | #include <linux/debug_locks.h> |
12 | #include <linux/interrupt.h> | |
456b565c | 13 | #include <linux/kmsg_dump.h> |
c95dbf27 IM |
14 | #include <linux/kallsyms.h> |
15 | #include <linux/notifier.h> | |
1da177e4 | 16 | #include <linux/module.h> |
c95dbf27 | 17 | #include <linux/random.h> |
de7edd31 | 18 | #include <linux/ftrace.h> |
1da177e4 | 19 | #include <linux/reboot.h> |
c95dbf27 IM |
20 | #include <linux/delay.h> |
21 | #include <linux/kexec.h> | |
22 | #include <linux/sched.h> | |
1da177e4 | 23 | #include <linux/sysrq.h> |
c95dbf27 | 24 | #include <linux/init.h> |
1da177e4 | 25 | #include <linux/nmi.h> |
08d78658 | 26 | #include <linux/console.h> |
1da177e4 | 27 | |
c7ff0d9c TS |
28 | #define PANIC_TIMER_STEP 100 |
29 | #define PANIC_BLINK_SPD 18 | |
30 | ||
2a01bb38 | 31 | int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE; |
25ddbb18 | 32 | static unsigned long tainted_mask; |
dd287796 AM |
33 | static int pause_on_oops; |
34 | static int pause_on_oops_flag; | |
35 | static DEFINE_SPINLOCK(pause_on_oops_lock); | |
5375b708 | 36 | bool crash_kexec_post_notifiers; |
9e3961a0 | 37 | int panic_on_warn __read_mostly; |
1da177e4 | 38 | |
5800dc3c | 39 | int panic_timeout = CONFIG_PANIC_TIMEOUT; |
81e88fdc | 40 | EXPORT_SYMBOL_GPL(panic_timeout); |
1da177e4 | 41 | |
e041c683 | 42 | ATOMIC_NOTIFIER_HEAD(panic_notifier_list); |
1da177e4 LT |
43 | |
44 | EXPORT_SYMBOL(panic_notifier_list); | |
45 | ||
c7ff0d9c | 46 | static long no_blink(int state) |
8aeee85a | 47 | { |
c7ff0d9c | 48 | return 0; |
8aeee85a AB |
49 | } |
50 | ||
c7ff0d9c TS |
51 | /* Returns how long it waited in ms */ |
52 | long (*panic_blink)(int state); | |
53 | EXPORT_SYMBOL(panic_blink); | |
54 | ||
93e13a36 MH |
55 | /* |
56 | * Stop ourself in panic -- architecture code may override this | |
57 | */ | |
58 | void __weak panic_smp_self_stop(void) | |
59 | { | |
60 | while (1) | |
61 | cpu_relax(); | |
62 | } | |
63 | ||
1717f209 HK |
64 | atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID); |
65 | ||
1da177e4 LT |
66 | /** |
67 | * panic - halt the system | |
68 | * @fmt: The text string to print | |
69 | * | |
70 | * Display a message, then perform cleanups. | |
71 | * | |
72 | * This function never returns. | |
73 | */ | |
9402c95f | 74 | void panic(const char *fmt, ...) |
1da177e4 | 75 | { |
1da177e4 LT |
76 | static char buf[1024]; |
77 | va_list args; | |
c7ff0d9c TS |
78 | long i, i_next = 0; |
79 | int state = 0; | |
1717f209 | 80 | int old_cpu, this_cpu; |
1da177e4 | 81 | |
190320c3 VM |
82 | /* |
83 | * Disable local interrupts. This will prevent panic_smp_self_stop | |
84 | * from deadlocking the first cpu that invokes the panic, since | |
85 | * there is nothing to prevent an interrupt handler (that runs | |
1717f209 | 86 | * after setting panic_cpu) from invoking panic() again. |
190320c3 VM |
87 | */ |
88 | local_irq_disable(); | |
89 | ||
dc009d92 | 90 | /* |
c95dbf27 IM |
91 | * It's possible to come here directly from a panic-assertion and |
92 | * not have preempt disabled. Some functions called from here want | |
dc009d92 | 93 | * preempt to be disabled. No point enabling it later though... |
93e13a36 MH |
94 | * |
95 | * Only one CPU is allowed to execute the panic code from here. For | |
96 | * multiple parallel invocations of panic, all other CPUs either | |
97 | * stop themself or will wait until they are stopped by the 1st CPU | |
98 | * with smp_send_stop(). | |
1717f209 HK |
99 | * |
100 | * `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which | |
101 | * comes here, so go ahead. | |
102 | * `old_cpu == this_cpu' means we came from nmi_panic() which sets | |
103 | * panic_cpu to this CPU. In this case, this is also the 1st CPU. | |
dc009d92 | 104 | */ |
1717f209 HK |
105 | this_cpu = raw_smp_processor_id(); |
106 | old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu); | |
107 | ||
108 | if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu) | |
93e13a36 | 109 | panic_smp_self_stop(); |
dc009d92 | 110 | |
5b530fc1 | 111 | console_verbose(); |
1da177e4 LT |
112 | bust_spinlocks(1); |
113 | va_start(args, fmt); | |
114 | vsnprintf(buf, sizeof(buf), fmt, args); | |
115 | va_end(args); | |
d7c0847f | 116 | pr_emerg("Kernel panic - not syncing: %s\n", buf); |
5cb27301 | 117 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
6e6f0a1f AK |
118 | /* |
119 | * Avoid nested stack-dumping if a panic occurs during oops processing | |
120 | */ | |
026ee1f6 | 121 | if (!test_taint(TAINT_DIE) && oops_in_progress <= 1) |
6e6f0a1f | 122 | dump_stack(); |
5cb27301 | 123 | #endif |
1da177e4 | 124 | |
dc009d92 EB |
125 | /* |
126 | * If we have crashed and we have a crash kernel loaded let it handle | |
127 | * everything else. | |
f06e5153 MH |
128 | * If we want to run this after calling panic_notifiers, pass |
129 | * the "crash_kexec_post_notifiers" option to the kernel. | |
dc009d92 | 130 | */ |
f06e5153 MH |
131 | if (!crash_kexec_post_notifiers) |
132 | crash_kexec(NULL); | |
dc009d92 | 133 | |
dc009d92 EB |
134 | /* |
135 | * Note smp_send_stop is the usual smp shutdown function, which | |
136 | * unfortunately means it may not be hardened to work in a panic | |
137 | * situation. | |
138 | */ | |
1da177e4 | 139 | smp_send_stop(); |
1da177e4 | 140 | |
6723734c KC |
141 | /* |
142 | * Run any panic handlers, including those that might need to | |
143 | * add information to the kmsg dump output. | |
144 | */ | |
e041c683 | 145 | atomic_notifier_call_chain(&panic_notifier_list, 0, buf); |
1da177e4 | 146 | |
6723734c KC |
147 | kmsg_dump(KMSG_DUMP_PANIC); |
148 | ||
f06e5153 MH |
149 | /* |
150 | * If you doubt kdump always works fine in any situation, | |
151 | * "crash_kexec_post_notifiers" offers you a chance to run | |
152 | * panic_notifiers and dumping kmsg before kdump. | |
153 | * Note: since some panic_notifiers can make crashed kernel | |
154 | * more unstable, it can increase risks of the kdump failure too. | |
155 | */ | |
f45d85ff HD |
156 | if (crash_kexec_post_notifiers) |
157 | crash_kexec(NULL); | |
f06e5153 | 158 | |
d014e889 AK |
159 | bust_spinlocks(0); |
160 | ||
08d78658 VK |
161 | /* |
162 | * We may have ended up stopping the CPU holding the lock (in | |
163 | * smp_send_stop()) while still having some valuable data in the console | |
164 | * buffer. Try to acquire the lock then release it regardless of the | |
7625b3a0 VK |
165 | * result. The release will also print the buffers out. Locks debug |
166 | * should be disabled to avoid reporting bad unlock balance when | |
167 | * panic() is not being callled from OOPS. | |
08d78658 | 168 | */ |
7625b3a0 | 169 | debug_locks_off(); |
08d78658 VK |
170 | console_trylock(); |
171 | console_unlock(); | |
172 | ||
c7ff0d9c TS |
173 | if (!panic_blink) |
174 | panic_blink = no_blink; | |
175 | ||
dc009d92 | 176 | if (panic_timeout > 0) { |
1da177e4 | 177 | /* |
c95dbf27 IM |
178 | * Delay timeout seconds before rebooting the machine. |
179 | * We can't use the "normal" timers since we just panicked. | |
180 | */ | |
d7c0847f | 181 | pr_emerg("Rebooting in %d seconds..", panic_timeout); |
c95dbf27 | 182 | |
c7ff0d9c | 183 | for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) { |
1da177e4 | 184 | touch_nmi_watchdog(); |
c7ff0d9c TS |
185 | if (i >= i_next) { |
186 | i += panic_blink(state ^= 1); | |
187 | i_next = i + 3600 / PANIC_BLINK_SPD; | |
188 | } | |
189 | mdelay(PANIC_TIMER_STEP); | |
1da177e4 | 190 | } |
4302fbc8 HD |
191 | } |
192 | if (panic_timeout != 0) { | |
c95dbf27 IM |
193 | /* |
194 | * This will not be a clean reboot, with everything | |
195 | * shutting down. But if there is a chance of | |
196 | * rebooting the system it will be rebooted. | |
1da177e4 | 197 | */ |
2f048ea8 | 198 | emergency_restart(); |
1da177e4 LT |
199 | } |
200 | #ifdef __sparc__ | |
201 | { | |
202 | extern int stop_a_enabled; | |
a271c241 | 203 | /* Make sure the user can actually press Stop-A (L1-A) */ |
1da177e4 | 204 | stop_a_enabled = 1; |
d7c0847f | 205 | pr_emerg("Press Stop-A (L1-A) to return to the boot prom\n"); |
1da177e4 LT |
206 | } |
207 | #endif | |
347a8dc3 | 208 | #if defined(CONFIG_S390) |
c95dbf27 IM |
209 | { |
210 | unsigned long caller; | |
211 | ||
212 | caller = (unsigned long)__builtin_return_address(0); | |
213 | disabled_wait(caller); | |
214 | } | |
1da177e4 | 215 | #endif |
d7c0847f | 216 | pr_emerg("---[ end Kernel panic - not syncing: %s\n", buf); |
1da177e4 | 217 | local_irq_enable(); |
c7ff0d9c | 218 | for (i = 0; ; i += PANIC_TIMER_STEP) { |
c22db941 | 219 | touch_softlockup_watchdog(); |
c7ff0d9c TS |
220 | if (i >= i_next) { |
221 | i += panic_blink(state ^= 1); | |
222 | i_next = i + 3600 / PANIC_BLINK_SPD; | |
223 | } | |
224 | mdelay(PANIC_TIMER_STEP); | |
1da177e4 LT |
225 | } |
226 | } | |
227 | ||
228 | EXPORT_SYMBOL(panic); | |
229 | ||
c277e63f | 230 | |
25ddbb18 | 231 | struct tnt { |
c95dbf27 IM |
232 | u8 bit; |
233 | char true; | |
234 | char false; | |
25ddbb18 AK |
235 | }; |
236 | ||
237 | static const struct tnt tnts[] = { | |
c95dbf27 IM |
238 | { TAINT_PROPRIETARY_MODULE, 'P', 'G' }, |
239 | { TAINT_FORCED_MODULE, 'F', ' ' }, | |
8c90487c | 240 | { TAINT_CPU_OUT_OF_SPEC, 'S', ' ' }, |
c95dbf27 IM |
241 | { TAINT_FORCED_RMMOD, 'R', ' ' }, |
242 | { TAINT_MACHINE_CHECK, 'M', ' ' }, | |
243 | { TAINT_BAD_PAGE, 'B', ' ' }, | |
244 | { TAINT_USER, 'U', ' ' }, | |
245 | { TAINT_DIE, 'D', ' ' }, | |
246 | { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' }, | |
247 | { TAINT_WARN, 'W', ' ' }, | |
248 | { TAINT_CRAP, 'C', ' ' }, | |
92946bc7 | 249 | { TAINT_FIRMWARE_WORKAROUND, 'I', ' ' }, |
2449b8ba | 250 | { TAINT_OOT_MODULE, 'O', ' ' }, |
57673c2b | 251 | { TAINT_UNSIGNED_MODULE, 'E', ' ' }, |
69361eef | 252 | { TAINT_SOFTLOCKUP, 'L', ' ' }, |
c5f45465 | 253 | { TAINT_LIVEPATCH, 'K', ' ' }, |
25ddbb18 AK |
254 | }; |
255 | ||
1da177e4 LT |
256 | /** |
257 | * print_tainted - return a string to represent the kernel taint state. | |
258 | * | |
259 | * 'P' - Proprietary module has been loaded. | |
260 | * 'F' - Module has been forcibly loaded. | |
261 | * 'S' - SMP with CPUs not designed for SMP. | |
262 | * 'R' - User forced a module unload. | |
9aa5e993 | 263 | * 'M' - System experienced a machine check exception. |
1da177e4 | 264 | * 'B' - System has hit bad_page. |
34f5a398 | 265 | * 'U' - Userspace-defined naughtiness. |
a8005992 | 266 | * 'D' - Kernel has oopsed before |
95b570c9 NH |
267 | * 'A' - ACPI table overridden. |
268 | * 'W' - Taint on warning. | |
061b1bd3 | 269 | * 'C' - modules from drivers/staging are loaded. |
92946bc7 | 270 | * 'I' - Working around severe firmware bug. |
2449b8ba | 271 | * 'O' - Out-of-tree module has been loaded. |
57673c2b | 272 | * 'E' - Unsigned module has been loaded. |
bc53a3f4 | 273 | * 'L' - A soft lockup has previously occurred. |
c5f45465 | 274 | * 'K' - Kernel has been live patched. |
1da177e4 | 275 | * |
fe002a41 | 276 | * The string is overwritten by the next call to print_tainted(). |
1da177e4 | 277 | */ |
1da177e4 LT |
278 | const char *print_tainted(void) |
279 | { | |
01284764 | 280 | static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ")]; |
25ddbb18 AK |
281 | |
282 | if (tainted_mask) { | |
283 | char *s; | |
284 | int i; | |
285 | ||
286 | s = buf + sprintf(buf, "Tainted: "); | |
287 | for (i = 0; i < ARRAY_SIZE(tnts); i++) { | |
288 | const struct tnt *t = &tnts[i]; | |
289 | *s++ = test_bit(t->bit, &tainted_mask) ? | |
290 | t->true : t->false; | |
291 | } | |
292 | *s = 0; | |
293 | } else | |
1da177e4 | 294 | snprintf(buf, sizeof(buf), "Not tainted"); |
c95dbf27 IM |
295 | |
296 | return buf; | |
1da177e4 LT |
297 | } |
298 | ||
25ddbb18 | 299 | int test_taint(unsigned flag) |
1da177e4 | 300 | { |
25ddbb18 AK |
301 | return test_bit(flag, &tainted_mask); |
302 | } | |
303 | EXPORT_SYMBOL(test_taint); | |
304 | ||
305 | unsigned long get_taint(void) | |
306 | { | |
307 | return tainted_mask; | |
1da177e4 | 308 | } |
dd287796 | 309 | |
373d4d09 RR |
310 | /** |
311 | * add_taint: add a taint flag if not already set. | |
312 | * @flag: one of the TAINT_* constants. | |
313 | * @lockdep_ok: whether lock debugging is still OK. | |
314 | * | |
315 | * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for | |
316 | * some notewortht-but-not-corrupting cases, it can be set to true. | |
317 | */ | |
318 | void add_taint(unsigned flag, enum lockdep_ok lockdep_ok) | |
dd287796 | 319 | { |
373d4d09 | 320 | if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off()) |
d7c0847f | 321 | pr_warn("Disabling lock debugging due to kernel taint\n"); |
9eeba613 | 322 | |
25ddbb18 | 323 | set_bit(flag, &tainted_mask); |
dd287796 | 324 | } |
1da177e4 | 325 | EXPORT_SYMBOL(add_taint); |
dd287796 AM |
326 | |
327 | static void spin_msec(int msecs) | |
328 | { | |
329 | int i; | |
330 | ||
331 | for (i = 0; i < msecs; i++) { | |
332 | touch_nmi_watchdog(); | |
333 | mdelay(1); | |
334 | } | |
335 | } | |
336 | ||
337 | /* | |
338 | * It just happens that oops_enter() and oops_exit() are identically | |
339 | * implemented... | |
340 | */ | |
341 | static void do_oops_enter_exit(void) | |
342 | { | |
343 | unsigned long flags; | |
344 | static int spin_counter; | |
345 | ||
346 | if (!pause_on_oops) | |
347 | return; | |
348 | ||
349 | spin_lock_irqsave(&pause_on_oops_lock, flags); | |
350 | if (pause_on_oops_flag == 0) { | |
351 | /* This CPU may now print the oops message */ | |
352 | pause_on_oops_flag = 1; | |
353 | } else { | |
354 | /* We need to stall this CPU */ | |
355 | if (!spin_counter) { | |
356 | /* This CPU gets to do the counting */ | |
357 | spin_counter = pause_on_oops; | |
358 | do { | |
359 | spin_unlock(&pause_on_oops_lock); | |
360 | spin_msec(MSEC_PER_SEC); | |
361 | spin_lock(&pause_on_oops_lock); | |
362 | } while (--spin_counter); | |
363 | pause_on_oops_flag = 0; | |
364 | } else { | |
365 | /* This CPU waits for a different one */ | |
366 | while (spin_counter) { | |
367 | spin_unlock(&pause_on_oops_lock); | |
368 | spin_msec(1); | |
369 | spin_lock(&pause_on_oops_lock); | |
370 | } | |
371 | } | |
372 | } | |
373 | spin_unlock_irqrestore(&pause_on_oops_lock, flags); | |
374 | } | |
375 | ||
376 | /* | |
c95dbf27 IM |
377 | * Return true if the calling CPU is allowed to print oops-related info. |
378 | * This is a bit racy.. | |
dd287796 AM |
379 | */ |
380 | int oops_may_print(void) | |
381 | { | |
382 | return pause_on_oops_flag == 0; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Called when the architecture enters its oops handler, before it prints | |
c95dbf27 IM |
387 | * anything. If this is the first CPU to oops, and it's oopsing the first |
388 | * time then let it proceed. | |
dd287796 | 389 | * |
c95dbf27 IM |
390 | * This is all enabled by the pause_on_oops kernel boot option. We do all |
391 | * this to ensure that oopses don't scroll off the screen. It has the | |
392 | * side-effect of preventing later-oopsing CPUs from mucking up the display, | |
393 | * too. | |
dd287796 | 394 | * |
c95dbf27 IM |
395 | * It turns out that the CPU which is allowed to print ends up pausing for |
396 | * the right duration, whereas all the other CPUs pause for twice as long: | |
397 | * once in oops_enter(), once in oops_exit(). | |
dd287796 AM |
398 | */ |
399 | void oops_enter(void) | |
400 | { | |
bdff7870 | 401 | tracing_off(); |
c95dbf27 IM |
402 | /* can't trust the integrity of the kernel anymore: */ |
403 | debug_locks_off(); | |
dd287796 AM |
404 | do_oops_enter_exit(); |
405 | } | |
406 | ||
2c3b20e9 AV |
407 | /* |
408 | * 64-bit random ID for oopses: | |
409 | */ | |
410 | static u64 oops_id; | |
411 | ||
412 | static int init_oops_id(void) | |
413 | { | |
414 | if (!oops_id) | |
415 | get_random_bytes(&oops_id, sizeof(oops_id)); | |
d6624f99 AV |
416 | else |
417 | oops_id++; | |
2c3b20e9 AV |
418 | |
419 | return 0; | |
420 | } | |
421 | late_initcall(init_oops_id); | |
422 | ||
863a6049 | 423 | void print_oops_end_marker(void) |
71c33911 AV |
424 | { |
425 | init_oops_id(); | |
d7c0847f | 426 | pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id); |
71c33911 AV |
427 | } |
428 | ||
dd287796 AM |
429 | /* |
430 | * Called when the architecture exits its oops handler, after printing | |
431 | * everything. | |
432 | */ | |
433 | void oops_exit(void) | |
434 | { | |
435 | do_oops_enter_exit(); | |
71c33911 | 436 | print_oops_end_marker(); |
456b565c | 437 | kmsg_dump(KMSG_DUMP_OOPS); |
dd287796 | 438 | } |
3162f751 | 439 | |
79b4cc5e | 440 | #ifdef WANT_WARN_ON_SLOWPATH |
0f6f49a8 LT |
441 | struct slowpath_args { |
442 | const char *fmt; | |
a8f18b90 | 443 | va_list args; |
0f6f49a8 | 444 | }; |
bd89bb29 | 445 | |
b2be0527 BH |
446 | static void warn_slowpath_common(const char *file, int line, void *caller, |
447 | unsigned taint, struct slowpath_args *args) | |
0f6f49a8 | 448 | { |
de7edd31 SRRH |
449 | disable_trace_on_warning(); |
450 | ||
dcb6b452 AT |
451 | pr_warn("------------[ cut here ]------------\n"); |
452 | pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS()\n", | |
453 | raw_smp_processor_id(), current->pid, file, line, caller); | |
74853dba | 454 | |
0f6f49a8 LT |
455 | if (args) |
456 | vprintk(args->fmt, args->args); | |
a8f18b90 | 457 | |
9e3961a0 PB |
458 | if (panic_on_warn) { |
459 | /* | |
460 | * This thread may hit another WARN() in the panic path. | |
461 | * Resetting this prevents additional WARN() from panicking the | |
462 | * system on this thread. Other threads are blocked by the | |
463 | * panic_mutex in panic(). | |
464 | */ | |
465 | panic_on_warn = 0; | |
466 | panic("panic_on_warn set ...\n"); | |
467 | } | |
468 | ||
a8f18b90 AV |
469 | print_modules(); |
470 | dump_stack(); | |
471 | print_oops_end_marker(); | |
373d4d09 RR |
472 | /* Just a warning, don't kill lockdep. */ |
473 | add_taint(taint, LOCKDEP_STILL_OK); | |
a8f18b90 | 474 | } |
0f6f49a8 LT |
475 | |
476 | void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...) | |
477 | { | |
478 | struct slowpath_args args; | |
479 | ||
480 | args.fmt = fmt; | |
481 | va_start(args.args, fmt); | |
b2be0527 BH |
482 | warn_slowpath_common(file, line, __builtin_return_address(0), |
483 | TAINT_WARN, &args); | |
0f6f49a8 LT |
484 | va_end(args.args); |
485 | } | |
57adc4d2 AK |
486 | EXPORT_SYMBOL(warn_slowpath_fmt); |
487 | ||
b2be0527 BH |
488 | void warn_slowpath_fmt_taint(const char *file, int line, |
489 | unsigned taint, const char *fmt, ...) | |
490 | { | |
491 | struct slowpath_args args; | |
492 | ||
493 | args.fmt = fmt; | |
494 | va_start(args.args, fmt); | |
495 | warn_slowpath_common(file, line, __builtin_return_address(0), | |
496 | taint, &args); | |
497 | va_end(args.args); | |
498 | } | |
499 | EXPORT_SYMBOL(warn_slowpath_fmt_taint); | |
500 | ||
57adc4d2 AK |
501 | void warn_slowpath_null(const char *file, int line) |
502 | { | |
b2be0527 BH |
503 | warn_slowpath_common(file, line, __builtin_return_address(0), |
504 | TAINT_WARN, NULL); | |
57adc4d2 AK |
505 | } |
506 | EXPORT_SYMBOL(warn_slowpath_null); | |
79b4cc5e AV |
507 | #endif |
508 | ||
3162f751 | 509 | #ifdef CONFIG_CC_STACKPROTECTOR |
54371a43 | 510 | |
3162f751 AV |
511 | /* |
512 | * Called when gcc's -fstack-protector feature is used, and | |
513 | * gcc detects corruption of the on-stack canary value | |
514 | */ | |
a7330c99 | 515 | __visible void __stack_chk_fail(void) |
3162f751 | 516 | { |
517a92c4 IM |
517 | panic("stack-protector: Kernel stack is corrupted in: %p\n", |
518 | __builtin_return_address(0)); | |
3162f751 AV |
519 | } |
520 | EXPORT_SYMBOL(__stack_chk_fail); | |
54371a43 | 521 | |
3162f751 | 522 | #endif |
f44dd164 RR |
523 | |
524 | core_param(panic, panic_timeout, int, 0644); | |
525 | core_param(pause_on_oops, pause_on_oops, int, 0644); | |
9e3961a0 | 526 | core_param(panic_on_warn, panic_on_warn, int, 0644); |
d404ab0a | 527 | |
f06e5153 MH |
528 | static int __init setup_crash_kexec_post_notifiers(char *s) |
529 | { | |
530 | crash_kexec_post_notifiers = true; | |
531 | return 0; | |
532 | } | |
533 | early_param("crash_kexec_post_notifiers", setup_crash_kexec_post_notifiers); | |
534 | ||
d404ab0a OH |
535 | static int __init oops_setup(char *s) |
536 | { | |
537 | if (!s) | |
538 | return -EINVAL; | |
539 | if (!strcmp(s, "panic")) | |
540 | panic_on_oops = 1; | |
541 | return 0; | |
542 | } | |
543 | early_param("oops", oops_setup); |