Blame view
kernel/panic.c
10.2 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 |
/* * 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. */ |
c95dbf27e panic: clean up k... |
11 12 |
#include <linux/debug_locks.h> #include <linux/interrupt.h> |
456b565cc core: Add kernel ... |
13 |
#include <linux/kmsg_dump.h> |
c95dbf27e panic: clean up k... |
14 15 |
#include <linux/kallsyms.h> #include <linux/notifier.h> |
1da177e4c Linux-2.6.12-rc2 |
16 |
#include <linux/module.h> |
c95dbf27e panic: clean up k... |
17 |
#include <linux/random.h> |
1da177e4c Linux-2.6.12-rc2 |
18 |
#include <linux/reboot.h> |
c95dbf27e panic: clean up k... |
19 20 21 |
#include <linux/delay.h> #include <linux/kexec.h> #include <linux/sched.h> |
1da177e4c Linux-2.6.12-rc2 |
22 |
#include <linux/sysrq.h> |
c95dbf27e panic: clean up k... |
23 |
#include <linux/init.h> |
1da177e4c Linux-2.6.12-rc2 |
24 |
#include <linux/nmi.h> |
bd89bb29a debug warnings: p... |
25 |
#include <linux/dmi.h> |
1da177e4c Linux-2.6.12-rc2 |
26 |
|
c7ff0d9c9 panic: keep blink... |
27 28 |
#define PANIC_TIMER_STEP 100 #define PANIC_BLINK_SPD 18 |
1da177e4c Linux-2.6.12-rc2 |
29 |
int panic_on_oops; |
25ddbb18a Make the taint fl... |
30 |
static unsigned long tainted_mask; |
dd287796d [PATCH] pause_on_... |
31 32 33 |
static int pause_on_oops; static int pause_on_oops_flag; static DEFINE_SPINLOCK(pause_on_oops_lock); |
1da177e4c Linux-2.6.12-rc2 |
34 |
|
dd287796d [PATCH] pause_on_... |
35 |
int panic_timeout; |
81e88fdc4 ACPI, APEI, Gener... |
36 |
EXPORT_SYMBOL_GPL(panic_timeout); |
1da177e4c Linux-2.6.12-rc2 |
37 |
|
e041c6834 [PATCH] Notifier ... |
38 |
ATOMIC_NOTIFIER_HEAD(panic_notifier_list); |
1da177e4c Linux-2.6.12-rc2 |
39 40 |
EXPORT_SYMBOL(panic_notifier_list); |
c7ff0d9c9 panic: keep blink... |
41 |
static long no_blink(int state) |
8aeee85a2 panic: fix panic_... |
42 |
{ |
c7ff0d9c9 panic: keep blink... |
43 |
return 0; |
8aeee85a2 panic: fix panic_... |
44 |
} |
c7ff0d9c9 panic: keep blink... |
45 46 47 |
/* Returns how long it waited in ms */ long (*panic_blink)(int state); EXPORT_SYMBOL(panic_blink); |
1da177e4c Linux-2.6.12-rc2 |
48 49 50 51 52 53 54 55 |
/** * panic - halt the system * @fmt: The text string to print * * Display a message, then perform cleanups. * * This function never returns. */ |
1da177e4c Linux-2.6.12-rc2 |
56 57 |
NORET_TYPE void panic(const char * fmt, ...) { |
1da177e4c Linux-2.6.12-rc2 |
58 59 |
static char buf[1024]; va_list args; |
c7ff0d9c9 panic: keep blink... |
60 61 |
long i, i_next = 0; int state = 0; |
1da177e4c Linux-2.6.12-rc2 |
62 |
|
dc009d924 [PATCH] kexec: ad... |
63 |
/* |
c95dbf27e panic: clean up k... |
64 65 |
* It's possible to come here directly from a panic-assertion and * not have preempt disabled. Some functions called from here want |
dc009d924 [PATCH] kexec: ad... |
66 67 68 |
* preempt to be disabled. No point enabling it later though... */ preempt_disable(); |
5b530fc18 panic: call conso... |
69 |
console_verbose(); |
1da177e4c Linux-2.6.12-rc2 |
70 71 72 73 74 75 |
bust_spinlocks(1); va_start(args, fmt); vsnprintf(buf, sizeof(buf), fmt, args); va_end(args); printk(KERN_EMERG "Kernel panic - not syncing: %s ",buf); |
5cb273013 panic: print out ... |
76 77 78 |
#ifdef CONFIG_DEBUG_BUGVERBOSE dump_stack(); #endif |
1da177e4c Linux-2.6.12-rc2 |
79 |
|
dc009d924 [PATCH] kexec: ad... |
80 81 82 83 84 |
/* * If we have crashed and we have a crash kernel loaded let it handle * everything else. * Do we want to call this before we try to display a message? */ |
6e274d144 [PATCH] kdump: Us... |
85 |
crash_kexec(NULL); |
dc009d924 [PATCH] kexec: ad... |
86 |
|
0f4bd46ec kmsg_dump: Dump o... |
87 |
kmsg_dump(KMSG_DUMP_PANIC); |
dc009d924 [PATCH] kexec: ad... |
88 89 90 91 92 |
/* * Note smp_send_stop is the usual smp shutdown function, which * unfortunately means it may not be hardened to work in a panic * situation. */ |
1da177e4c Linux-2.6.12-rc2 |
93 |
smp_send_stop(); |
1da177e4c Linux-2.6.12-rc2 |
94 |
|
e041c6834 [PATCH] Notifier ... |
95 |
atomic_notifier_call_chain(&panic_notifier_list, 0, buf); |
1da177e4c Linux-2.6.12-rc2 |
96 |
|
d014e8894 panic: Fix panic ... |
97 |
bust_spinlocks(0); |
c7ff0d9c9 panic: keep blink... |
98 99 |
if (!panic_blink) panic_blink = no_blink; |
dc009d924 [PATCH] kexec: ad... |
100 |
if (panic_timeout > 0) { |
1da177e4c Linux-2.6.12-rc2 |
101 |
/* |
c95dbf27e panic: clean up k... |
102 103 104 105 |
* Delay timeout seconds before rebooting the machine. * We can't use the "normal" timers since we just panicked. */ printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout); |
c7ff0d9c9 panic: keep blink... |
106 |
for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) { |
1da177e4c Linux-2.6.12-rc2 |
107 |
touch_nmi_watchdog(); |
c7ff0d9c9 panic: keep blink... |
108 109 110 111 112 |
if (i >= i_next) { i += panic_blink(state ^= 1); i_next = i + 3600 / PANIC_BLINK_SPD; } mdelay(PANIC_TIMER_STEP); |
1da177e4c Linux-2.6.12-rc2 |
113 |
} |
4302fbc8e panic: panic=-1 f... |
114 115 |
} if (panic_timeout != 0) { |
c95dbf27e panic: clean up k... |
116 117 118 119 |
/* * 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. |
1da177e4c Linux-2.6.12-rc2 |
120 |
*/ |
2f048ea81 [PATCH] Call emer... |
121 |
emergency_restart(); |
1da177e4c Linux-2.6.12-rc2 |
122 123 124 125 |
} #ifdef __sparc__ { extern int stop_a_enabled; |
a271c241a [SPARC]: Stop-A p... |
126 |
/* Make sure the user can actually press Stop-A (L1-A) */ |
1da177e4c Linux-2.6.12-rc2 |
127 |
stop_a_enabled = 1; |
a271c241a [SPARC]: Stop-A p... |
128 129 |
printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom "); |
1da177e4c Linux-2.6.12-rc2 |
130 131 |
} #endif |
347a8dc3b [PATCH] s390: cle... |
132 |
#if defined(CONFIG_S390) |
c95dbf27e panic: clean up k... |
133 134 135 136 137 138 |
{ unsigned long caller; caller = (unsigned long)__builtin_return_address(0); disabled_wait(caller); } |
1da177e4c Linux-2.6.12-rc2 |
139 140 |
#endif local_irq_enable(); |
c7ff0d9c9 panic: keep blink... |
141 |
for (i = 0; ; i += PANIC_TIMER_STEP) { |
c22db9412 [PATCH] prevent r... |
142 |
touch_softlockup_watchdog(); |
c7ff0d9c9 panic: keep blink... |
143 144 145 146 147 |
if (i >= i_next) { i += panic_blink(state ^= 1); i_next = i + 3600 / PANIC_BLINK_SPD; } mdelay(PANIC_TIMER_STEP); |
1da177e4c Linux-2.6.12-rc2 |
148 149 150 151 |
} } EXPORT_SYMBOL(panic); |
c277e63fb whitespace fixes:... |
152 |
|
25ddbb18a Make the taint fl... |
153 |
struct tnt { |
c95dbf27e panic: clean up k... |
154 155 156 |
u8 bit; char true; char false; |
25ddbb18a Make the taint fl... |
157 158 159 |
}; static const struct tnt tnts[] = { |
c95dbf27e panic: clean up k... |
160 161 162 163 164 165 166 167 168 169 170 |
{ TAINT_PROPRIETARY_MODULE, 'P', 'G' }, { TAINT_FORCED_MODULE, 'F', ' ' }, { TAINT_UNSAFE_SMP, 'S', ' ' }, { TAINT_FORCED_RMMOD, 'R', ' ' }, { TAINT_MACHINE_CHECK, 'M', ' ' }, { TAINT_BAD_PAGE, 'B', ' ' }, { TAINT_USER, 'U', ' ' }, { TAINT_DIE, 'D', ' ' }, { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' }, { TAINT_WARN, 'W', ' ' }, { TAINT_CRAP, 'C', ' ' }, |
92946bc72 panic: Add taint ... |
171 |
{ TAINT_FIRMWARE_WORKAROUND, 'I', ' ' }, |
2449b8ba0 module,bug: Add T... |
172 |
{ TAINT_OOT_MODULE, 'O', ' ' }, |
25ddbb18a Make the taint fl... |
173 |
}; |
1da177e4c Linux-2.6.12-rc2 |
174 175 176 177 178 179 180 |
/** * print_tainted - return a string to represent the kernel taint state. * * 'P' - Proprietary module has been loaded. * 'F' - Module has been forcibly loaded. * 'S' - SMP with CPUs not designed for SMP. * 'R' - User forced a module unload. |
9aa5e993f trivial comment w... |
181 |
* 'M' - System experienced a machine check exception. |
1da177e4c Linux-2.6.12-rc2 |
182 |
* 'B' - System has hit bad_page. |
34f5a3989 [PATCH] Add TAINT... |
183 |
* 'U' - Userspace-defined naughtiness. |
a80059928 taint: add missin... |
184 |
* 'D' - Kernel has oopsed before |
95b570c9c Taint kernel afte... |
185 186 |
* 'A' - ACPI table overridden. * 'W' - Taint on warning. |
061b1bd39 Staging: add TAIN... |
187 |
* 'C' - modules from drivers/staging are loaded. |
92946bc72 panic: Add taint ... |
188 |
* 'I' - Working around severe firmware bug. |
2449b8ba0 module,bug: Add T... |
189 |
* 'O' - Out-of-tree module has been loaded. |
1da177e4c Linux-2.6.12-rc2 |
190 |
* |
fe002a419 trivial: Correct ... |
191 |
* The string is overwritten by the next call to print_tainted(). |
1da177e4c Linux-2.6.12-rc2 |
192 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
193 194 |
const char *print_tainted(void) { |
25ddbb18a Make the taint fl... |
195 196 197 198 199 200 201 202 203 204 205 206 207 208 |
static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1]; if (tainted_mask) { char *s; int i; s = buf + sprintf(buf, "Tainted: "); for (i = 0; i < ARRAY_SIZE(tnts); i++) { const struct tnt *t = &tnts[i]; *s++ = test_bit(t->bit, &tainted_mask) ? t->true : t->false; } *s = 0; } else |
1da177e4c Linux-2.6.12-rc2 |
209 |
snprintf(buf, sizeof(buf), "Not tainted"); |
c95dbf27e panic: clean up k... |
210 211 |
return buf; |
1da177e4c Linux-2.6.12-rc2 |
212 |
} |
25ddbb18a Make the taint fl... |
213 |
int test_taint(unsigned flag) |
1da177e4c Linux-2.6.12-rc2 |
214 |
{ |
25ddbb18a Make the taint fl... |
215 216 217 218 219 220 221 |
return test_bit(flag, &tainted_mask); } EXPORT_SYMBOL(test_taint); unsigned long get_taint(void) { return tainted_mask; |
1da177e4c Linux-2.6.12-rc2 |
222 |
} |
dd287796d [PATCH] pause_on_... |
223 |
|
1da177e4c Linux-2.6.12-rc2 |
224 |
void add_taint(unsigned flag) |
dd287796d [PATCH] pause_on_... |
225 |
{ |
9eeba6138 lockdep: warn abo... |
226 227 228 229 |
/* * Can't trust the integrity of the kernel anymore. * We don't call directly debug_locks_off() because the issue * is not necessarily serious enough to set oops_in_progress to 1 |
574bbe782 lockdep: continue... |
230 231 |
* Also we want to keep up lockdep for staging development and * post-warning case. |
9eeba6138 lockdep: warn abo... |
232 |
*/ |
574bbe782 lockdep: continue... |
233 |
if (flag != TAINT_CRAP && flag != TAINT_WARN && __debug_locks_off()) |
b48ccb095 locking: clarify ... |
234 235 |
printk(KERN_WARNING "Disabling lock debugging due to kernel taint "); |
9eeba6138 lockdep: warn abo... |
236 |
|
25ddbb18a Make the taint fl... |
237 |
set_bit(flag, &tainted_mask); |
dd287796d [PATCH] pause_on_... |
238 |
} |
1da177e4c Linux-2.6.12-rc2 |
239 |
EXPORT_SYMBOL(add_taint); |
dd287796d [PATCH] pause_on_... |
240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 |
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... |
291 292 |
* Return true if the calling CPU is allowed to print oops-related info. * This is a bit racy.. |
dd287796d [PATCH] pause_on_... |
293 294 295 296 297 298 299 300 |
*/ int oops_may_print(void) { return pause_on_oops_flag == 0; } /* * Called when the architecture enters its oops handler, before it prints |
c95dbf27e panic: clean up k... |
301 302 |
* anything. If this is the first CPU to oops, and it's oopsing the first * time then let it proceed. |
dd287796d [PATCH] pause_on_... |
303 |
* |
c95dbf27e panic: clean up k... |
304 305 306 307 |
* 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_... |
308 |
* |
c95dbf27e panic: clean up k... |
309 310 311 |
* 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_... |
312 313 314 |
*/ void oops_enter(void) { |
bdff78707 trace: stop trace... |
315 |
tracing_off(); |
c95dbf27e panic: clean up k... |
316 317 |
/* can't trust the integrity of the kernel anymore: */ debug_locks_off(); |
dd287796d [PATCH] pause_on_... |
318 319 320 321 |
do_oops_enter_exit(); } /* |
2c3b20e91 debug: add end-of... |
322 323 324 325 326 327 328 329 |
* 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... |
330 331 |
else oops_id++; |
2c3b20e91 debug: add end-of... |
332 333 334 335 |
return 0; } late_initcall(init_oops_id); |
863a60492 lib/bug.c: add oo... |
336 |
void print_oops_end_marker(void) |
71c339116 debug: add the en... |
337 338 339 340 341 342 |
{ init_oops_id(); printk(KERN_WARNING "---[ end trace %016llx ]--- ", (unsigned long long)oops_id); } |
2c3b20e91 debug: add end-of... |
343 |
/* |
dd287796d [PATCH] pause_on_... |
344 345 346 347 348 349 |
* Called when the architecture exits its oops handler, after printing * everything. */ void oops_exit(void) { do_oops_enter_exit(); |
71c339116 debug: add the en... |
350 |
print_oops_end_marker(); |
456b565cc core: Add kernel ... |
351 |
kmsg_dump(KMSG_DUMP_OOPS); |
dd287796d [PATCH] pause_on_... |
352 |
} |
3162f751d [PATCH] Add the _... |
353 |
|
79b4cc5ee debug: move WARN_... |
354 |
#ifdef WANT_WARN_ON_SLOWPATH |
0f6f49a8c Fix caller inform... |
355 356 |
struct slowpath_args { const char *fmt; |
a8f18b909 Add a WARN() macr... |
357 |
va_list args; |
0f6f49a8c Fix caller inform... |
358 |
}; |
bd89bb29a debug warnings: p... |
359 |
|
b2be05273 panic: Allow warn... |
360 361 |
static void warn_slowpath_common(const char *file, int line, void *caller, unsigned taint, struct slowpath_args *args) |
0f6f49a8c Fix caller inform... |
362 363 |
{ const char *board; |
a8f18b909 Add a WARN() macr... |
364 365 366 |
printk(KERN_WARNING "------------[ cut here ]------------ "); |
0f6f49a8c Fix caller inform... |
367 368 |
printk(KERN_WARNING "WARNING: at %s:%d %pS() ", file, line, caller); |
bd89bb29a debug warnings: p... |
369 370 371 372 |
board = dmi_get_system_info(DMI_PRODUCT_NAME); if (board) printk(KERN_WARNING "Hardware name: %s ", board); |
74853dba2 debug warnings: c... |
373 |
|
0f6f49a8c Fix caller inform... |
374 375 |
if (args) vprintk(args->fmt, args->args); |
a8f18b909 Add a WARN() macr... |
376 377 378 379 |
print_modules(); dump_stack(); print_oops_end_marker(); |
b2be05273 panic: Allow warn... |
380 |
add_taint(taint); |
a8f18b909 Add a WARN() macr... |
381 |
} |
0f6f49a8c Fix caller inform... |
382 383 384 385 386 387 388 |
void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...) { struct slowpath_args args; args.fmt = fmt; va_start(args.args, fmt); |
b2be05273 panic: Allow warn... |
389 390 |
warn_slowpath_common(file, line, __builtin_return_address(0), TAINT_WARN, &args); |
0f6f49a8c Fix caller inform... |
391 392 |
va_end(args.args); } |
57adc4d2d Eliminate thousan... |
393 |
EXPORT_SYMBOL(warn_slowpath_fmt); |
b2be05273 panic: Allow warn... |
394 395 396 397 398 399 400 401 402 403 404 405 |
void warn_slowpath_fmt_taint(const char *file, int line, unsigned taint, const char *fmt, ...) { struct slowpath_args args; args.fmt = fmt; va_start(args.args, fmt); warn_slowpath_common(file, line, __builtin_return_address(0), taint, &args); va_end(args.args); } EXPORT_SYMBOL(warn_slowpath_fmt_taint); |
57adc4d2d Eliminate thousan... |
406 407 |
void warn_slowpath_null(const char *file, int line) { |
b2be05273 panic: Allow warn... |
408 409 |
warn_slowpath_common(file, line, __builtin_return_address(0), TAINT_WARN, NULL); |
57adc4d2d Eliminate thousan... |
410 411 |
} EXPORT_SYMBOL(warn_slowpath_null); |
79b4cc5ee debug: move WARN_... |
412 |
#endif |
3162f751d [PATCH] Add the _... |
413 |
#ifdef CONFIG_CC_STACKPROTECTOR |
54371a43a x86: add CONFIG_C... |
414 |
|
3162f751d [PATCH] Add the _... |
415 416 417 418 419 420 |
/* * Called when gcc's -fstack-protector feature is used, and * gcc detects corruption of the on-stack canary value */ void __stack_chk_fail(void) { |
517a92c4e panic: print more... |
421 422 423 |
panic("stack-protector: Kernel stack is corrupted in: %p ", __builtin_return_address(0)); |
3162f751d [PATCH] Add the _... |
424 425 |
} EXPORT_SYMBOL(__stack_chk_fail); |
54371a43a x86: add CONFIG_C... |
426 |
|
3162f751d [PATCH] Add the _... |
427 |
#endif |
f44dd164f Make panic= and p... |
428 429 430 |
core_param(panic, panic_timeout, int, 0644); core_param(pause_on_oops, pause_on_oops, int, 0644); |
d404ab0a1 move x86 specific... |
431 432 433 434 435 436 437 438 439 440 |
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); |