Blame view
kernel/panic.c
17.5 KB
457c89965
|
1 |
// SPDX-License-Identifier: GPL-2.0-only |
1da177e4c
|
2 3 4 5 6 7 8 9 10 11 |
/* * 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
|
12 |
#include <linux/debug_locks.h> |
b17b01533
|
13 |
#include <linux/sched/debug.h> |
c95dbf27e
|
14 |
#include <linux/interrupt.h> |
7d92bda27
|
15 |
#include <linux/kgdb.h> |
456b565cc
|
16 |
#include <linux/kmsg_dump.h> |
c95dbf27e
|
17 18 |
#include <linux/kallsyms.h> #include <linux/notifier.h> |
c7c3f05e3
|
19 |
#include <linux/vt_kern.h> |
1da177e4c
|
20 |
#include <linux/module.h> |
c95dbf27e
|
21 |
#include <linux/random.h> |
de7edd314
|
22 |
#include <linux/ftrace.h> |
1da177e4c
|
23 |
#include <linux/reboot.h> |
c95dbf27e
|
24 25 26 |
#include <linux/delay.h> #include <linux/kexec.h> #include <linux/sched.h> |
1da177e4c
|
27 |
#include <linux/sysrq.h> |
c95dbf27e
|
28 |
#include <linux/init.h> |
1da177e4c
|
29 |
#include <linux/nmi.h> |
08d78658f
|
30 |
#include <linux/console.h> |
2553b67a1
|
31 |
#include <linux/bug.h> |
7a46ec0e2
|
32 |
#include <linux/ratelimit.h> |
b1fca27d3
|
33 34 |
#include <linux/debugfs.h> #include <asm/sections.h> |
1da177e4c
|
35 |
|
c7ff0d9c9
|
36 37 |
#define PANIC_TIMER_STEP 100 #define PANIC_BLINK_SPD 18 |
2a01bb388
|
38 |
int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE; |
bc4f2f546
|
39 40 |
static unsigned long tainted_mask = IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0; |
dd287796d
|
41 42 43 |
static int pause_on_oops; static int pause_on_oops_flag; static DEFINE_SPINLOCK(pause_on_oops_lock); |
5375b708f
|
44 |
bool crash_kexec_post_notifiers; |
9e3961a09
|
45 |
int panic_on_warn __read_mostly; |
1da177e4c
|
46 |
|
5800dc3cf
|
47 |
int panic_timeout = CONFIG_PANIC_TIMEOUT; |
81e88fdc4
|
48 |
EXPORT_SYMBOL_GPL(panic_timeout); |
1da177e4c
|
49 |
|
d999bd939
|
50 51 52 53 54 |
#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 |
de6da1e8b
|
55 |
#define PANIC_PRINT_ALL_PRINTK_MSG 0x00000020 |
81c9d43f9
|
56 |
unsigned long panic_print; |
d999bd939
|
57 |
|
e041c6834
|
58 |
ATOMIC_NOTIFIER_HEAD(panic_notifier_list); |
1da177e4c
|
59 60 |
EXPORT_SYMBOL(panic_notifier_list); |
c7ff0d9c9
|
61 |
static long no_blink(int state) |
8aeee85a2
|
62 |
{ |
c7ff0d9c9
|
63 |
return 0; |
8aeee85a2
|
64 |
} |
c7ff0d9c9
|
65 66 67 |
/* Returns how long it waited in ms */ long (*panic_blink)(int state); EXPORT_SYMBOL(panic_blink); |
93e13a360
|
68 69 70 71 72 73 74 75 |
/* * Stop ourself in panic -- architecture code may override this */ void __weak panic_smp_self_stop(void) { while (1) cpu_relax(); } |
58c5661f2
|
76 77 78 79 80 81 82 83 |
/* * 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(); } |
0ee59413c
|
84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 |
/* * 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; } |
1717f2096
|
109 |
atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID); |
ebc41f20d
|
110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 |
/* * 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); |
d999bd939
|
129 130 |
static void panic_print_sys_info(void) { |
de6da1e8b
|
131 132 |
if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG) console_flush_on_panic(CONSOLE_REPLAY_ALL); |
d999bd939
|
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 |
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); } |
1da177e4c
|
148 149 150 151 152 153 154 155 |
/** * panic - halt the system * @fmt: The text string to print * * Display a message, then perform cleanups. * * This function never returns. */ |
9402c95f3
|
156 |
void panic(const char *fmt, ...) |
1da177e4c
|
157 |
{ |
1da177e4c
|
158 159 |
static char buf[1024]; va_list args; |
b49dec1cf
|
160 |
long i, i_next = 0, len; |
c7ff0d9c9
|
161 |
int state = 0; |
1717f2096
|
162 |
int old_cpu, this_cpu; |
b26e27ddf
|
163 |
bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers; |
1da177e4c
|
164 |
|
dc009d924
|
165 |
/* |
190320c3b
|
166 167 168 |
* 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 |
1717f2096
|
169 |
* after setting panic_cpu) from invoking panic() again. |
190320c3b
|
170 171 |
*/ local_irq_disable(); |
20bb759a6
|
172 |
preempt_disable_notrace(); |
190320c3b
|
173 174 |
/* |
c95dbf27e
|
175 176 |
* It's possible to come here directly from a panic-assertion and * not have preempt disabled. Some functions called from here want |
dc009d924
|
177 |
* preempt to be disabled. No point enabling it later though... |
93e13a360
|
178 179 180 181 182 |
* * 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(). |
1717f2096
|
183 184 185 186 187 |
* * `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. |
dc009d924
|
188 |
*/ |
1717f2096
|
189 190 191 192 |
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) |
93e13a360
|
193 |
panic_smp_self_stop(); |
dc009d924
|
194 |
|
5b530fc18
|
195 |
console_verbose(); |
1da177e4c
|
196 197 |
bust_spinlocks(1); va_start(args, fmt); |
b49dec1cf
|
198 |
len = vscnprintf(buf, sizeof(buf), fmt, args); |
1da177e4c
|
199 |
va_end(args); |
b49dec1cf
|
200 201 202 203 |
if (len && buf[len - 1] == ' ') buf[len - 1] = '\0'; |
d7c0847fe
|
204 205 |
pr_emerg("Kernel panic - not syncing: %s ", buf); |
5cb273013
|
206 |
#ifdef CONFIG_DEBUG_BUGVERBOSE |
6e6f0a1f0
|
207 208 209 |
/* * Avoid nested stack-dumping if a panic occurs during oops processing */ |
026ee1f66
|
210 |
if (!test_taint(TAINT_DIE) && oops_in_progress <= 1) |
6e6f0a1f0
|
211 |
dump_stack(); |
5cb273013
|
212 |
#endif |
1da177e4c
|
213 |
|
dc009d924
|
214 |
/* |
7d92bda27
|
215 216 217 218 219 220 221 |
* 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); /* |
dc009d924
|
222 223 |
* If we have crashed and we have a crash kernel loaded let it handle * everything else. |
f06e5153f
|
224 225 |
* If we want to run this after calling panic_notifiers, pass * the "crash_kexec_post_notifiers" option to the kernel. |
7bbee5ca3
|
226 227 |
* * Bypass the panic_cpu check and call __crash_kexec directly. |
dc009d924
|
228 |
*/ |
b26e27ddf
|
229 |
if (!_crash_kexec_post_notifiers) { |
f92bac3b1
|
230 |
printk_safe_flush_on_panic(); |
7bbee5ca3
|
231 |
__crash_kexec(NULL); |
dc009d924
|
232 |
|
0ee59413c
|
233 234 235 236 237 238 239 240 241 242 243 244 245 246 |
/* * 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(); } |
1da177e4c
|
247 |
|
6723734cd
|
248 249 250 251 |
/* * Run any panic handlers, including those that might need to * add information to the kmsg dump output. */ |
e041c6834
|
252 |
atomic_notifier_call_chain(&panic_notifier_list, 0, buf); |
1da177e4c
|
253 |
|
cf9b1106c
|
254 |
/* Call flush even twice. It tries harder with a single online CPU */ |
f92bac3b1
|
255 |
printk_safe_flush_on_panic(); |
6723734cd
|
256 |
kmsg_dump(KMSG_DUMP_PANIC); |
f06e5153f
|
257 258 259 260 261 262 |
/* * 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. |
7bbee5ca3
|
263 264 |
* * Bypass the panic_cpu check and call __crash_kexec directly. |
f06e5153f
|
265 |
*/ |
b26e27ddf
|
266 |
if (_crash_kexec_post_notifiers) |
7bbee5ca3
|
267 |
__crash_kexec(NULL); |
f06e5153f
|
268 |
|
c7c3f05e3
|
269 270 271 272 |
#ifdef CONFIG_VT unblank_screen(); #endif console_unblank(); |
d014e8894
|
273 |
|
08d78658f
|
274 275 276 277 |
/* * 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 |
7625b3a00
|
278 279 280 |
* 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. |
08d78658f
|
281 |
*/ |
7625b3a00
|
282 |
debug_locks_off(); |
de6da1e8b
|
283 |
console_flush_on_panic(CONSOLE_FLUSH_PENDING); |
08d78658f
|
284 |
|
d999bd939
|
285 |
panic_print_sys_info(); |
c7ff0d9c9
|
286 287 |
if (!panic_blink) panic_blink = no_blink; |
dc009d924
|
288 |
if (panic_timeout > 0) { |
1da177e4c
|
289 |
/* |
c95dbf27e
|
290 291 292 |
* Delay timeout seconds before rebooting the machine. * We can't use the "normal" timers since we just panicked. */ |
ff7a28a07
|
293 294 |
pr_emerg("Rebooting in %d seconds.. ", panic_timeout); |
c95dbf27e
|
295 |
|
c7ff0d9c9
|
296 |
for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) { |
1da177e4c
|
297 |
touch_nmi_watchdog(); |
c7ff0d9c9
|
298 299 300 301 302 |
if (i >= i_next) { i += panic_blink(state ^= 1); i_next = i + 3600 / PANIC_BLINK_SPD; } mdelay(PANIC_TIMER_STEP); |
1da177e4c
|
303 |
} |
4302fbc8e
|
304 305 |
} if (panic_timeout != 0) { |
c95dbf27e
|
306 307 308 309 |
/* * 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
|
310 |
*/ |
b287a25a7
|
311 312 |
if (panic_reboot_mode != REBOOT_UNDEFINED) reboot_mode = panic_reboot_mode; |
2f048ea81
|
313 |
emergency_restart(); |
1da177e4c
|
314 315 316 317 |
} #ifdef __sparc__ { extern int stop_a_enabled; |
a271c241a
|
318 |
/* Make sure the user can actually press Stop-A (L1-A) */ |
1da177e4c
|
319 |
stop_a_enabled = 1; |
7db60d05e
|
320 321 322 323 |
pr_emerg("Press Stop-A (L1-A) from sun keyboard or send break " "twice on console to return to the boot prom "); |
1da177e4c
|
324 325 |
} #endif |
347a8dc3b
|
326 |
#if defined(CONFIG_S390) |
98587c2d8
|
327 |
disabled_wait(); |
1da177e4c
|
328 |
#endif |
5ad751053
|
329 330 |
pr_emerg("---[ end Kernel panic - not syncing: %s ]--- ", buf); |
c39ea0b9d
|
331 332 333 |
/* Do not scroll important messages printed above */ suppress_printk = 1; |
1da177e4c
|
334 |
local_irq_enable(); |
c7ff0d9c9
|
335 |
for (i = 0; ; i += PANIC_TIMER_STEP) { |
c22db9412
|
336 |
touch_softlockup_watchdog(); |
c7ff0d9c9
|
337 338 339 340 341 |
if (i >= i_next) { i += panic_blink(state ^= 1); i_next = i + 3600 / PANIC_BLINK_SPD; } mdelay(PANIC_TIMER_STEP); |
1da177e4c
|
342 343 344 345 |
} } EXPORT_SYMBOL(panic); |
7fd8329ba
|
346 347 348 349 350 |
/* * 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] = { |
47d4b263a
|
351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 |
[ 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 }, |
bc4f2f546
|
368 |
[ TAINT_RANDSTRUCT ] = { 'T', ' ', true }, |
25ddbb18a
|
369 |
}; |
1da177e4c
|
370 |
/** |
9c4560e5b
|
371 |
* print_tainted - return a string to represent the kernel taint state. |
1da177e4c
|
372 |
* |
570432470
|
373 |
* For individual taint flag meanings, see Documentation/admin-guide/sysctl/kernel.rst |
1da177e4c
|
374 |
* |
9c4560e5b
|
375 376 |
* The string is overwritten by the next call to print_tainted(), * but is always NULL terminated. |
1da177e4c
|
377 |
*/ |
1da177e4c
|
378 379 |
const char *print_tainted(void) { |
7fd8329ba
|
380 |
static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")]; |
25ddbb18a
|
381 |
|
47d4b263a
|
382 |
BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT); |
25ddbb18a
|
383 384 385 386 387 |
if (tainted_mask) { char *s; int i; s = buf + sprintf(buf, "Tainted: "); |
7fd8329ba
|
388 389 390 |
for (i = 0; i < TAINT_FLAGS_COUNT; i++) { const struct taint_flag *t = &taint_flags[i]; *s++ = test_bit(i, &tainted_mask) ? |
5eb7c0d04
|
391 |
t->c_true : t->c_false; |
25ddbb18a
|
392 393 394 |
} *s = 0; } else |
1da177e4c
|
395 |
snprintf(buf, sizeof(buf), "Not tainted"); |
c95dbf27e
|
396 397 |
return buf; |
1da177e4c
|
398 |
} |
25ddbb18a
|
399 |
int test_taint(unsigned flag) |
1da177e4c
|
400 |
{ |
25ddbb18a
|
401 402 403 404 405 406 407 |
return test_bit(flag, &tainted_mask); } EXPORT_SYMBOL(test_taint); unsigned long get_taint(void) { return tainted_mask; |
1da177e4c
|
408 |
} |
dd287796d
|
409 |
|
373d4d099
|
410 411 412 413 414 415 416 417 418 |
/** * 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) |
dd287796d
|
419 |
{ |
373d4d099
|
420 |
if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off()) |
d7c0847fe
|
421 422 |
pr_warn("Disabling lock debugging due to kernel taint "); |
9eeba6138
|
423 |
|
25ddbb18a
|
424 |
set_bit(flag, &tainted_mask); |
dd287796d
|
425 |
} |
1da177e4c
|
426 |
EXPORT_SYMBOL(add_taint); |
dd287796d
|
427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 |
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
|
478 479 |
* Return true if the calling CPU is allowed to print oops-related info. * This is a bit racy.. |
dd287796d
|
480 481 482 483 484 485 486 487 |
*/ int oops_may_print(void) { return pause_on_oops_flag == 0; } /* * Called when the architecture enters its oops handler, before it prints |
c95dbf27e
|
488 489 |
* anything. If this is the first CPU to oops, and it's oopsing the first * time then let it proceed. |
dd287796d
|
490 |
* |
c95dbf27e
|
491 492 493 494 |
* 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
|
495 |
* |
c95dbf27e
|
496 497 498 |
* 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
|
499 500 501 |
*/ void oops_enter(void) { |
bdff78707
|
502 |
tracing_off(); |
c95dbf27e
|
503 504 |
/* can't trust the integrity of the kernel anymore: */ debug_locks_off(); |
dd287796d
|
505 506 507 508 |
do_oops_enter_exit(); } /* |
2c3b20e91
|
509 510 511 512 513 514 515 516 |
* 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
|
517 518 |
else oops_id++; |
2c3b20e91
|
519 520 521 522 |
return 0; } late_initcall(init_oops_id); |
863a60492
|
523 |
void print_oops_end_marker(void) |
71c339116
|
524 525 |
{ init_oops_id(); |
d7c0847fe
|
526 527 |
pr_warn("---[ end trace %016llx ]--- ", (unsigned long long)oops_id); |
71c339116
|
528 |
} |
2c3b20e91
|
529 |
/* |
dd287796d
|
530 531 532 533 534 535 |
* Called when the architecture exits its oops handler, after printing * everything. */ void oops_exit(void) { do_oops_enter_exit(); |
71c339116
|
536 |
print_oops_end_marker(); |
456b565cc
|
537 |
kmsg_dump(KMSG_DUMP_OOPS); |
dd287796d
|
538 |
} |
3162f751d
|
539 |
|
2553b67a1
|
540 |
struct warn_args { |
0f6f49a8c
|
541 |
const char *fmt; |
a8f18b909
|
542 |
va_list args; |
0f6f49a8c
|
543 |
}; |
bd89bb29a
|
544 |
|
2553b67a1
|
545 546 |
void __warn(const char *file, int line, void *caller, unsigned taint, struct pt_regs *regs, struct warn_args *args) |
0f6f49a8c
|
547 |
{ |
de7edd314
|
548 |
disable_trace_on_warning(); |
2553b67a1
|
549 550 551 552 553 554 555 556 557 |
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
|
558 |
|
0f6f49a8c
|
559 560 |
if (args) vprintk(args->fmt, args->args); |
a8f18b909
|
561 |
|
9e3961a09
|
562 563 564 565 566 567 568 569 570 571 572 |
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 ... "); } |
a8f18b909
|
573 |
print_modules(); |
2553b67a1
|
574 575 576 577 578 |
if (regs) show_regs(regs); else dump_stack(); |
4c281074d
|
579 |
print_irqtrace_events(current); |
a8f18b909
|
580 |
print_oops_end_marker(); |
2553b67a1
|
581 |
|
373d4d099
|
582 583 |
/* Just a warning, don't kill lockdep. */ add_taint(taint, LOCKDEP_STILL_OK); |
a8f18b909
|
584 |
} |
0f6f49a8c
|
585 |
|
2da1ead4d
|
586 |
#ifndef __WARN_FLAGS |
ee8711336
|
587 588 |
void warn_slowpath_fmt(const char *file, int line, unsigned taint, const char *fmt, ...) |
b2be05273
|
589 |
{ |
2553b67a1
|
590 |
struct warn_args args; |
b2be05273
|
591 |
|
d38aba49a
|
592 |
pr_warn(CUT_HERE); |
f2f84b05e
|
593 |
if (!fmt) { |
f2f84b05e
|
594 595 596 597 |
__warn(file, line, __builtin_return_address(0), taint, NULL, NULL); return; } |
b2be05273
|
598 599 |
args.fmt = fmt; va_start(args.args, fmt); |
2553b67a1
|
600 |
__warn(file, line, __builtin_return_address(0), taint, NULL, &args); |
b2be05273
|
601 602 |
va_end(args.args); } |
ee8711336
|
603 |
EXPORT_SYMBOL(warn_slowpath_fmt); |
a7bed27af
|
604 605 606 607 608 609 610 611 612 613 614 615 |
#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
|
616 |
#endif |
b1fca27d3
|
617 618 619 620 621 622 |
#ifdef CONFIG_BUG /* Support resetting WARN*_ONCE state */ static int clear_warn_once_set(void *data, u64 val) { |
aaf5dcfb2
|
623 |
generic_bug_clear_once(); |
b1fca27d3
|
624 625 626 |
memset(__start_once, 0, __end_once - __start_once); return 0; } |
4169680e9
|
627 628 629 |
DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set, "%lld "); |
b1fca27d3
|
630 631 632 633 |
static __init int register_warn_debugfs(void) { /* Don't care about failure */ |
4169680e9
|
634 635 |
debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL, &clear_warn_once_fops); |
b1fca27d3
|
636 637 638 639 640 |
return 0; } device_initcall(register_warn_debugfs); #endif |
050e9baa9
|
641 |
#ifdef CONFIG_STACKPROTECTOR |
54371a43a
|
642 |
|
3162f751d
|
643 644 645 646 |
/* * Called when gcc's -fstack-protector feature is used, and * gcc detects corruption of the on-stack canary value */ |
a7330c997
|
647 |
__visible void __stack_chk_fail(void) |
3162f751d
|
648 |
{ |
95c4fb78f
|
649 |
panic("stack-protector: Kernel stack is corrupted in: %pB", |
517a92c4e
|
650 |
__builtin_return_address(0)); |
3162f751d
|
651 652 |
} EXPORT_SYMBOL(__stack_chk_fail); |
54371a43a
|
653 |
|
3162f751d
|
654 |
#endif |
f44dd164f
|
655 |
|
7a46ec0e2
|
656 657 658 659 660 661 662 663 664 665 666 |
#ifdef CONFIG_ARCH_HAS_REFCOUNT void refcount_error_report(struct pt_regs *regs, const char *err) { WARN_RATELIMIT(1, "refcount_t %s at %pB in %s[%d], uid/euid: %u/%u ", err, (void *)instruction_pointer(regs), current->comm, task_pid_nr(current), from_kuid_munged(&init_user_ns, current_uid()), from_kuid_munged(&init_user_ns, current_euid())); } #endif |
f44dd164f
|
667 |
core_param(panic, panic_timeout, int, 0644); |
d999bd939
|
668 |
core_param(panic_print, panic_print, ulong, 0644); |
f44dd164f
|
669 |
core_param(pause_on_oops, pause_on_oops, int, 0644); |
9e3961a09
|
670 |
core_param(panic_on_warn, panic_on_warn, int, 0644); |
b26e27ddf
|
671 |
core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644); |
f06e5153f
|
672 |
|
d404ab0a1
|
673 674 675 676 677 678 679 680 681 |
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); |