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1 #include "redis.h"
2 #include "sha1.h" /* SHA1 is used for DEBUG DIGEST */
3
4 #include <arpa/inet.h>
5 #include <signal.h>
6
7 #ifdef HAVE_BACKTRACE
8 #include <execinfo.h>
9 #include <ucontext.h>
10 #endif /* HAVE_BACKTRACE */
11
12 /* ================================= Debugging ============================== */
13
14 /* Compute the sha1 of string at 's' with 'len' bytes long.
15 * The SHA1 is then xored againt the string pointed by digest.
16 * Since xor is commutative, this operation is used in order to
17 * "add" digests relative to unordered elements.
18 *
19 * So digest(a,b,c,d) will be the same of digest(b,a,c,d) */
20 void xorDigest(unsigned char *digest, void *ptr, size_t len) {
21 SHA1_CTX ctx;
22 unsigned char hash[20], *s = ptr;
23 int j;
24
25 SHA1Init(&ctx);
26 SHA1Update(&ctx,s,len);
27 SHA1Final(hash,&ctx);
28
29 for (j = 0; j < 20; j++)
30 digest[j] ^= hash[j];
31 }
32
33 void xorObjectDigest(unsigned char *digest, robj *o) {
34 o = getDecodedObject(o);
35 xorDigest(digest,o->ptr,sdslen(o->ptr));
36 decrRefCount(o);
37 }
38
39 /* This function instead of just computing the SHA1 and xoring it
40 * against diget, also perform the digest of "digest" itself and
41 * replace the old value with the new one.
42 *
43 * So the final digest will be:
44 *
45 * digest = SHA1(digest xor SHA1(data))
46 *
47 * This function is used every time we want to preserve the order so
48 * that digest(a,b,c,d) will be different than digest(b,c,d,a)
49 *
50 * Also note that mixdigest("foo") followed by mixdigest("bar")
51 * will lead to a different digest compared to "fo", "obar".
52 */
53 void mixDigest(unsigned char *digest, void *ptr, size_t len) {
54 SHA1_CTX ctx;
55 char *s = ptr;
56
57 xorDigest(digest,s,len);
58 SHA1Init(&ctx);
59 SHA1Update(&ctx,digest,20);
60 SHA1Final(digest,&ctx);
61 }
62
63 void mixObjectDigest(unsigned char *digest, robj *o) {
64 o = getDecodedObject(o);
65 mixDigest(digest,o->ptr,sdslen(o->ptr));
66 decrRefCount(o);
67 }
68
69 /* Compute the dataset digest. Since keys, sets elements, hashes elements
70 * are not ordered, we use a trick: every aggregate digest is the xor
71 * of the digests of their elements. This way the order will not change
72 * the result. For list instead we use a feedback entering the output digest
73 * as input in order to ensure that a different ordered list will result in
74 * a different digest. */
75 void computeDatasetDigest(unsigned char *final) {
76 unsigned char digest[20];
77 char buf[128];
78 dictIterator *di = NULL;
79 dictEntry *de;
80 int j;
81 uint32_t aux;
82
83 memset(final,0,20); /* Start with a clean result */
84
85 for (j = 0; j < server.dbnum; j++) {
86 redisDb *db = server.db+j;
87
88 if (dictSize(db->dict) == 0) continue;
89 di = dictGetIterator(db->dict);
90
91 /* hash the DB id, so the same dataset moved in a different
92 * DB will lead to a different digest */
93 aux = htonl(j);
94 mixDigest(final,&aux,sizeof(aux));
95
96 /* Iterate this DB writing every entry */
97 while((de = dictNext(di)) != NULL) {
98 sds key;
99 robj *keyobj, *o;
100 long long expiretime;
101
102 memset(digest,0,20); /* This key-val digest */
103 key = dictGetKey(de);
104 keyobj = createStringObject(key,sdslen(key));
105
106 mixDigest(digest,key,sdslen(key));
107
108 /* Make sure the key is loaded if VM is active */
109 o = dictGetVal(de);
110
111 aux = htonl(o->type);
112 mixDigest(digest,&aux,sizeof(aux));
113 expiretime = getExpire(db,keyobj);
114
115 /* Save the key and associated value */
116 if (o->type == REDIS_STRING) {
117 mixObjectDigest(digest,o);
118 } else if (o->type == REDIS_LIST) {
119 listTypeIterator *li = listTypeInitIterator(o,0,REDIS_TAIL);
120 listTypeEntry entry;
121 while(listTypeNext(li,&entry)) {
122 robj *eleobj = listTypeGet(&entry);
123 mixObjectDigest(digest,eleobj);
124 decrRefCount(eleobj);
125 }
126 listTypeReleaseIterator(li);
127 } else if (o->type == REDIS_SET) {
128 setTypeIterator *si = setTypeInitIterator(o);
129 robj *ele;
130 while((ele = setTypeNextObject(si)) != NULL) {
131 xorObjectDigest(digest,ele);
132 decrRefCount(ele);
133 }
134 setTypeReleaseIterator(si);
135 } else if (o->type == REDIS_ZSET) {
136 unsigned char eledigest[20];
137
138 if (o->encoding == REDIS_ENCODING_ZIPLIST) {
139 unsigned char *zl = o->ptr;
140 unsigned char *eptr, *sptr;
141 unsigned char *vstr;
142 unsigned int vlen;
143 long long vll;
144 double score;
145
146 eptr = ziplistIndex(zl,0);
147 redisAssert(eptr != NULL);
148 sptr = ziplistNext(zl,eptr);
149 redisAssert(sptr != NULL);
150
151 while (eptr != NULL) {
152 redisAssert(ziplistGet(eptr,&vstr,&vlen,&vll));
153 score = zzlGetScore(sptr);
154
155 memset(eledigest,0,20);
156 if (vstr != NULL) {
157 mixDigest(eledigest,vstr,vlen);
158 } else {
159 ll2string(buf,sizeof(buf),vll);
160 mixDigest(eledigest,buf,strlen(buf));
161 }
162
163 snprintf(buf,sizeof(buf),"%.17g",score);
164 mixDigest(eledigest,buf,strlen(buf));
165 xorDigest(digest,eledigest,20);
166 zzlNext(zl,&eptr,&sptr);
167 }
168 } else if (o->encoding == REDIS_ENCODING_SKIPLIST) {
169 zset *zs = o->ptr;
170 dictIterator *di = dictGetIterator(zs->dict);
171 dictEntry *de;
172
173 while((de = dictNext(di)) != NULL) {
174 robj *eleobj = dictGetKey(de);
175 double *score = dictGetVal(de);
176
177 snprintf(buf,sizeof(buf),"%.17g",*score);
178 memset(eledigest,0,20);
179 mixObjectDigest(eledigest,eleobj);
180 mixDigest(eledigest,buf,strlen(buf));
181 xorDigest(digest,eledigest,20);
182 }
183 dictReleaseIterator(di);
184 } else {
185 redisPanic("Unknown sorted set encoding");
186 }
187 } else if (o->type == REDIS_HASH) {
188 hashTypeIterator *hi;
189 robj *obj;
190
191 hi = hashTypeInitIterator(o);
192 while (hashTypeNext(hi) != REDIS_ERR) {
193 unsigned char eledigest[20];
194
195 memset(eledigest,0,20);
196 obj = hashTypeCurrentObject(hi,REDIS_HASH_KEY);
197 mixObjectDigest(eledigest,obj);
198 decrRefCount(obj);
199 obj = hashTypeCurrentObject(hi,REDIS_HASH_VALUE);
200 mixObjectDigest(eledigest,obj);
201 decrRefCount(obj);
202 xorDigest(digest,eledigest,20);
203 }
204 hashTypeReleaseIterator(hi);
205 } else {
206 redisPanic("Unknown object type");
207 }
208 /* If the key has an expire, add it to the mix */
209 if (expiretime != -1) xorDigest(digest,"!!expire!!",10);
210 /* We can finally xor the key-val digest to the final digest */
211 xorDigest(final,digest,20);
212 decrRefCount(keyobj);
213 }
214 dictReleaseIterator(di);
215 }
216 }
217
218 void debugCommand(redisClient *c) {
219 if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
220 *((char*)-1) = 'x';
221 } else if (!strcasecmp(c->argv[1]->ptr,"assert")) {
222 if (c->argc >= 3) c->argv[2] = tryObjectEncoding(c->argv[2]);
223 redisAssertWithInfo(c,c->argv[0],1 == 2);
224 } else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
225 if (rdbSave(server.rdb_filename) != REDIS_OK) {
226 addReply(c,shared.err);
227 return;
228 }
229 emptyDb();
230 if (rdbLoad(server.rdb_filename) != REDIS_OK) {
231 addReplyError(c,"Error trying to load the RDB dump");
232 return;
233 }
234 redisLog(REDIS_WARNING,"DB reloaded by DEBUG RELOAD");
235 addReply(c,shared.ok);
236 } else if (!strcasecmp(c->argv[1]->ptr,"loadaof")) {
237 emptyDb();
238 if (loadAppendOnlyFile(server.aof_filename) != REDIS_OK) {
239 addReply(c,shared.err);
240 return;
241 }
242 server.dirty = 0; /* Prevent AOF / replication */
243 redisLog(REDIS_WARNING,"Append Only File loaded by DEBUG LOADAOF");
244 addReply(c,shared.ok);
245 } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
246 dictEntry *de;
247 robj *val;
248 char *strenc;
249
250 if ((de = dictFind(c->db->dict,c->argv[2]->ptr)) == NULL) {
251 addReply(c,shared.nokeyerr);
252 return;
253 }
254 val = dictGetVal(de);
255 strenc = strEncoding(val->encoding);
256
257 addReplyStatusFormat(c,
258 "Value at:%p refcount:%d "
259 "encoding:%s serializedlength:%lld "
260 "lru:%d lru_seconds_idle:%lu",
261 (void*)val, val->refcount,
262 strenc, (long long) rdbSavedObjectLen(val),
263 val->lru, estimateObjectIdleTime(val));
264 } else if (!strcasecmp(c->argv[1]->ptr,"populate") && c->argc == 3) {
265 long keys, j;
266 robj *key, *val;
267 char buf[128];
268
269 if (getLongFromObjectOrReply(c, c->argv[2], &keys, NULL) != REDIS_OK)
270 return;
271 for (j = 0; j < keys; j++) {
272 snprintf(buf,sizeof(buf),"key:%lu",j);
273 key = createStringObject(buf,strlen(buf));
274 if (lookupKeyRead(c->db,key) != NULL) {
275 decrRefCount(key);
276 continue;
277 }
278 snprintf(buf,sizeof(buf),"value:%lu",j);
279 val = createStringObject(buf,strlen(buf));
280 dbAdd(c->db,key,val);
281 decrRefCount(key);
282 }
283 addReply(c,shared.ok);
284 } else if (!strcasecmp(c->argv[1]->ptr,"digest") && c->argc == 2) {
285 unsigned char digest[20];
286 sds d = sdsempty();
287 int j;
288
289 computeDatasetDigest(digest);
290 for (j = 0; j < 20; j++)
291 d = sdscatprintf(d, "%02x",digest[j]);
292 addReplyStatus(c,d);
293 sdsfree(d);
294 } else if (!strcasecmp(c->argv[1]->ptr,"sleep") && c->argc == 3) {
295 double dtime = strtod(c->argv[2]->ptr,NULL);
296 long long utime = dtime*1000000;
297
298 usleep(utime);
299 addReply(c,shared.ok);
300 } else {
301 addReplyError(c,
302 "Syntax error, try DEBUG [SEGFAULT|OBJECT <key>|SWAPIN <key>|SWAPOUT <key>|RELOAD]");
303 }
304 }
305
306 /* =========================== Crash handling ============================== */
307
308 void _redisAssert(char *estr, char *file, int line) {
309 bugReportStart();
310 redisLog(REDIS_WARNING,"=== ASSERTION FAILED ===");
311 redisLog(REDIS_WARNING,"==> %s:%d '%s' is not true",file,line,estr);
312 #ifdef HAVE_BACKTRACE
313 server.assert_failed = estr;
314 server.assert_file = file;
315 server.assert_line = line;
316 redisLog(REDIS_WARNING,"(forcing SIGSEGV to print the bug report.)");
317 *((char*)-1) = 'x';
318 #endif
319 }
320
321 void _redisAssertPrintClientInfo(redisClient *c) {
322 int j;
323
324 bugReportStart();
325 redisLog(REDIS_WARNING,"=== ASSERTION FAILED CLIENT CONTEXT ===");
326 redisLog(REDIS_WARNING,"client->flags = %d", c->flags);
327 redisLog(REDIS_WARNING,"client->fd = %d", c->fd);
328 redisLog(REDIS_WARNING,"client->argc = %d", c->argc);
329 for (j=0; j < c->argc; j++) {
330 char buf[128];
331 char *arg;
332
333 if (c->argv[j]->type == REDIS_STRING &&
334 c->argv[j]->encoding == REDIS_ENCODING_RAW)
335 {
336 arg = (char*) c->argv[j]->ptr;
337 } else {
338 snprintf(buf,sizeof(buf),"Object type: %d, encoding: %d",
339 c->argv[j]->type, c->argv[j]->encoding);
340 arg = buf;
341 }
342 redisLog(REDIS_WARNING,"client->argv[%d] = \"%s\" (refcount: %d)",
343 j, arg, c->argv[j]->refcount);
344 }
345 }
346
347 void redisLogObjectDebugInfo(robj *o) {
348 redisLog(REDIS_WARNING,"Object type: %d", o->type);
349 redisLog(REDIS_WARNING,"Object encoding: %d", o->encoding);
350 redisLog(REDIS_WARNING,"Object refcount: %d", o->refcount);
351 if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_RAW) {
352 redisLog(REDIS_WARNING,"Object raw string len: %d", sdslen(o->ptr));
353 if (sdslen(o->ptr) < 4096)
354 redisLog(REDIS_WARNING,"Object raw string content: \"%s\"", (char*)o->ptr);
355 } else if (o->type == REDIS_LIST) {
356 redisLog(REDIS_WARNING,"List length: %d", (int) listTypeLength(o));
357 } else if (o->type == REDIS_SET) {
358 redisLog(REDIS_WARNING,"Set size: %d", (int) setTypeSize(o));
359 } else if (o->type == REDIS_HASH) {
360 redisLog(REDIS_WARNING,"Hash size: %d", (int) hashTypeLength(o));
361 } else if (o->type == REDIS_ZSET) {
362 redisLog(REDIS_WARNING,"Sorted set size: %d", (int) zsetLength(o));
363 if (o->encoding == REDIS_ENCODING_SKIPLIST)
364 redisLog(REDIS_WARNING,"Skiplist level: %d", (int) ((zset*)o->ptr)->zsl->level);
365 }
366 }
367
368 void _redisAssertPrintObject(robj *o) {
369 bugReportStart();
370 redisLog(REDIS_WARNING,"=== ASSERTION FAILED OBJECT CONTEXT ===");
371 redisLogObjectDebugInfo(o);
372 }
373
374 void _redisAssertWithInfo(redisClient *c, robj *o, char *estr, char *file, int line) {
375 if (c) _redisAssertPrintClientInfo(c);
376 if (o) _redisAssertPrintObject(o);
377 _redisAssert(estr,file,line);
378 }
379
380 void _redisPanic(char *msg, char *file, int line) {
381 bugReportStart();
382 redisLog(REDIS_WARNING,"------------------------------------------------");
383 redisLog(REDIS_WARNING,"!!! Software Failure. Press left mouse button to continue");
384 redisLog(REDIS_WARNING,"Guru Meditation: %s #%s:%d",msg,file,line);
385 #ifdef HAVE_BACKTRACE
386 redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
387 redisLog(REDIS_WARNING,"------------------------------------------------");
388 *((char*)-1) = 'x';
389 #endif
390 }
391
392 #ifdef HAVE_BACKTRACE
393 static void *getMcontextEip(ucontext_t *uc) {
394 #if defined(__FreeBSD__)
395 return (void*) uc->uc_mcontext.mc_eip;
396 #elif defined(__dietlibc__)
397 return (void*) uc->uc_mcontext.eip;
398 #elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
399 #if __x86_64__
400 return (void*) uc->uc_mcontext->__ss.__rip;
401 #elif __i386__
402 return (void*) uc->uc_mcontext->__ss.__eip;
403 #else
404 return (void*) uc->uc_mcontext->__ss.__srr0;
405 #endif
406 #elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
407 #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
408 return (void*) uc->uc_mcontext->__ss.__rip;
409 #else
410 return (void*) uc->uc_mcontext->__ss.__eip;
411 #endif
412 #elif defined(__i386__)
413 return (void*) uc->uc_mcontext.gregs[14]; /* Linux 32 */
414 #elif defined(__X86_64__) || defined(__x86_64__)
415 return (void*) uc->uc_mcontext.gregs[16]; /* Linux 64 */
416 #elif defined(__ia64__) /* Linux IA64 */
417 return (void*) uc->uc_mcontext.sc_ip;
418 #else
419 return NULL;
420 #endif
421 }
422
423 void bugReportStart(void) {
424 if (server.bug_report_start == 0) {
425 redisLog(REDIS_WARNING,
426 "\n\n=== REDIS BUG REPORT START: Cut & paste starting from here ===");
427 server.bug_report_start = 1;
428 }
429 }
430
431 void logStackContent(void **sp) {
432 int i;
433 for (i = 15; i >= 0; i--) {
434 if (sizeof(long) == 4)
435 redisLog(REDIS_WARNING, "(%08lx) -> %08lx", sp+i, sp[i]);
436 else
437 redisLog(REDIS_WARNING, "(%016lx) -> %016lx", sp+i, sp[i]);
438 }
439 }
440
441 void logRegisters(ucontext_t *uc) {
442 redisLog(REDIS_WARNING, "--- REGISTERS");
443 #if defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
444 #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
445 redisLog(REDIS_WARNING,
446 "\n"
447 "RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
448 "RDI:%016lx RSI:%016lx\nRBP:%016lx RSP:%016lx\n"
449 "R8 :%016lx R9 :%016lx\nR10:%016lx R11:%016lx\n"
450 "R12:%016lx R13:%016lx\nR14:%016lx R15:%016lx\n"
451 "RIP:%016lx EFL:%016lx\nCS :%016lx FS:%016lx GS:%016lx",
452 uc->uc_mcontext->__ss.__rax,
453 uc->uc_mcontext->__ss.__rbx,
454 uc->uc_mcontext->__ss.__rcx,
455 uc->uc_mcontext->__ss.__rdx,
456 uc->uc_mcontext->__ss.__rdi,
457 uc->uc_mcontext->__ss.__rsi,
458 uc->uc_mcontext->__ss.__rbp,
459 uc->uc_mcontext->__ss.__rsp,
460 uc->uc_mcontext->__ss.__r8,
461 uc->uc_mcontext->__ss.__r9,
462 uc->uc_mcontext->__ss.__r10,
463 uc->uc_mcontext->__ss.__r11,
464 uc->uc_mcontext->__ss.__r12,
465 uc->uc_mcontext->__ss.__r13,
466 uc->uc_mcontext->__ss.__r14,
467 uc->uc_mcontext->__ss.__r15,
468 uc->uc_mcontext->__ss.__rip,
469 uc->uc_mcontext->__ss.__rflags,
470 uc->uc_mcontext->__ss.__cs,
471 uc->uc_mcontext->__ss.__fs,
472 uc->uc_mcontext->__ss.__gs
473 );
474 logStackContent((void**)uc->uc_mcontext->__ss.__rsp);
475 #else
476 redisLog(REDIS_WARNING,
477 "\n"
478 "EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
479 "EDI:%08lx ESI:%08lx EBP:%08lx ESP:%08lx\n"
480 "SS:%08lx EFL:%08lx EIP:%08lx CS :%08lx\n"
481 "DS:%08lx ES:%08lx FS :%08lx GS :%08lx",
482 uc->uc_mcontext->__ss.__eax,
483 uc->uc_mcontext->__ss.__ebx,
484 uc->uc_mcontext->__ss.__ecx,
485 uc->uc_mcontext->__ss.__edx,
486 uc->uc_mcontext->__ss.__edi,
487 uc->uc_mcontext->__ss.__esi,
488 uc->uc_mcontext->__ss.__ebp,
489 uc->uc_mcontext->__ss.__esp,
490 uc->uc_mcontext->__ss.__ss,
491 uc->uc_mcontext->__ss.__eflags,
492 uc->uc_mcontext->__ss.__eip,
493 uc->uc_mcontext->__ss.__cs,
494 uc->uc_mcontext->__ss.__ds,
495 uc->uc_mcontext->__ss.__es,
496 uc->uc_mcontext->__ss.__fs,
497 uc->uc_mcontext->__ss.__gs
498 );
499 logStackContent((void**)uc->uc_mcontext->__ss.__esp);
500 #endif
501 #elif defined(__i386__)
502 redisLog(REDIS_WARNING,
503 "\n"
504 "EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
505 "EDI:%08lx ESI:%08lx EBP:%08lx ESP:%08lx\n"
506 "SS :%08lx EFL:%08lx EIP:%08lx CS:%08lx\n"
507 "DS :%08lx ES :%08lx FS :%08lx GS:%08lx",
508 uc->uc_mcontext.gregs[11],
509 uc->uc_mcontext.gregs[8],
510 uc->uc_mcontext.gregs[10],
511 uc->uc_mcontext.gregs[9],
512 uc->uc_mcontext.gregs[4],
513 uc->uc_mcontext.gregs[5],
514 uc->uc_mcontext.gregs[6],
515 uc->uc_mcontext.gregs[7],
516 uc->uc_mcontext.gregs[18],
517 uc->uc_mcontext.gregs[17],
518 uc->uc_mcontext.gregs[14],
519 uc->uc_mcontext.gregs[15],
520 uc->uc_mcontext.gregs[3],
521 uc->uc_mcontext.gregs[2],
522 uc->uc_mcontext.gregs[1],
523 uc->uc_mcontext.gregs[0]
524 );
525 logStackContent((void**)uc->uc_mcontext.gregs[7]);
526 #elif defined(__X86_64__) || defined(__x86_64__)
527 redisLog(REDIS_WARNING,
528 "\n"
529 "RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
530 "RDI:%016lx RSI:%016lx\nRBP:%016lx RSP:%016lx\n"
531 "R8 :%016lx R9 :%016lx\nR10:%016lx R11:%016lx\n"
532 "R12:%016lx R13:%016lx\nR14:%016lx R15:%016lx\n"
533 "RIP:%016lx EFL:%016lx\nCSGSFS:%016lx",
534 uc->uc_mcontext.gregs[13],
535 uc->uc_mcontext.gregs[11],
536 uc->uc_mcontext.gregs[14],
537 uc->uc_mcontext.gregs[12],
538 uc->uc_mcontext.gregs[8],
539 uc->uc_mcontext.gregs[9],
540 uc->uc_mcontext.gregs[10],
541 uc->uc_mcontext.gregs[15],
542 uc->uc_mcontext.gregs[0],
543 uc->uc_mcontext.gregs[1],
544 uc->uc_mcontext.gregs[2],
545 uc->uc_mcontext.gregs[3],
546 uc->uc_mcontext.gregs[4],
547 uc->uc_mcontext.gregs[5],
548 uc->uc_mcontext.gregs[6],
549 uc->uc_mcontext.gregs[7],
550 uc->uc_mcontext.gregs[16],
551 uc->uc_mcontext.gregs[17],
552 uc->uc_mcontext.gregs[18]
553 );
554 logStackContent((void**)uc->uc_mcontext.gregs[15]);
555 #else
556 redisLog(REDIS_WARNING,
557 " Dumping of registers not supported for this OS/arch");
558 #endif
559 }
560
561 void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
562 void *trace[100];
563 char **messages = NULL;
564 int i, trace_size = 0;
565 ucontext_t *uc = (ucontext_t*) secret;
566 sds infostring, clients;
567 struct sigaction act;
568 REDIS_NOTUSED(info);
569
570 bugReportStart();
571 redisLog(REDIS_WARNING,
572 " Redis %s crashed by signal: %d", REDIS_VERSION, sig);
573 redisLog(REDIS_WARNING,
574 " Failed assertion: %s (%s:%d)", server.assert_failed,
575 server.assert_file, server.assert_line);
576
577 /* Generate the stack trace */
578 trace_size = backtrace(trace, 100);
579
580 /* overwrite sigaction with caller's address */
581 if (getMcontextEip(uc) != NULL) {
582 trace[1] = getMcontextEip(uc);
583 }
584 messages = backtrace_symbols(trace, trace_size);
585 redisLog(REDIS_WARNING, "--- STACK TRACE");
586 for (i=1; i<trace_size; ++i)
587 redisLog(REDIS_WARNING,"%s", messages[i]);
588
589 /* Log INFO and CLIENT LIST */
590 redisLog(REDIS_WARNING, "--- INFO OUTPUT");
591 infostring = genRedisInfoString("all");
592 redisLogRaw(REDIS_WARNING, infostring);
593 redisLog(REDIS_WARNING, "--- CLIENT LIST OUTPUT");
594 clients = getAllClientsInfoString();
595 redisLogRaw(REDIS_WARNING, clients);
596 /* Don't sdsfree() strings to avoid a crash. Memory may be corrupted. */
597
598 /* Log CURRENT CLIENT info */
599 if (server.current_client) {
600 redisClient *cc = server.current_client;
601 sds client;
602 int j;
603
604 redisLog(REDIS_WARNING, "--- CURRENT CLIENT INFO");
605 client = getClientInfoString(cc);
606 redisLog(REDIS_WARNING,"client: %s", client);
607 /* Missing sdsfree(client) to avoid crash if memory is corrupted. */
608 for (j = 0; j < cc->argc; j++) {
609 robj *decoded;
610
611 decoded = getDecodedObject(cc->argv[j]);
612 redisLog(REDIS_WARNING,"argv[%d]: '%s'", j, (char*)decoded->ptr);
613 decrRefCount(decoded);
614 }
615 /* Check if the first argument, usually a key, is found inside the
616 * selected DB, and if so print info about the associated object. */
617 if (cc->argc >= 1) {
618 robj *val, *key;
619 dictEntry *de;
620
621 key = getDecodedObject(cc->argv[1]);
622 de = dictFind(cc->db->dict, key->ptr);
623 if (de) {
624 val = dictGetVal(de);
625 redisLog(REDIS_WARNING,"key '%s' found in DB containing the following object:", key->ptr);
626 redisLogObjectDebugInfo(val);
627 }
628 decrRefCount(key);
629 }
630 }
631
632 /* Log dump of processor registers */
633 logRegisters(uc);
634
635 redisLog(REDIS_WARNING,
636 "\n=== REDIS BUG REPORT END. Make sure to include from START to END. ===\n\n"
637 " Please report the crash opening an issue on github:\n\n"
638 " http://github.com/antirez/redis/issues\n\n"
639 );
640 /* free(messages); Don't call free() with possibly corrupted memory. */
641 if (server.daemonize) unlink(server.pidfile);
642
643 /* Make sure we exit with the right signal at the end. So for instance
644 * the core will be dumped if enabled. */
645 sigemptyset (&act.sa_mask);
646 /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
647 * is used. Otherwise, sa_handler is used */
648 act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
649 act.sa_handler = SIG_DFL;
650 sigaction (sig, &act, NULL);
651 kill(getpid(),sig);
652 }
653 #endif /* HAVE_BACKTRACE */
Redis += OpenLDAP MDB