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diff --git a/src/debug.c b/src/debug.c
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index 0000000..a4caa49
--- /dev/null
+++ b/src/debug.c
@@ -0,0 +1,1201 @@
+/*
+ * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Redis nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "server.h"
+#include "sha1.h" /* SHA1 is used for DEBUG DIGEST */
+#include "crc64.h"
+
+#include <arpa/inet.h>
+#include <signal.h>
+#include <dlfcn.h>
+
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+#include <ucontext.h>
+#include <fcntl.h>
+#include "bio.h"
+#include <unistd.h>
+#endif /* HAVE_BACKTRACE */
+
+#ifdef __CYGWIN__
+#ifndef SA_ONSTACK
+#define SA_ONSTACK 0x08000000
+#endif
+#endif
+
+/* ================================= Debugging ============================== */
+
+/* Compute the sha1 of string at 's' with 'len' bytes long.
+ * The SHA1 is then xored against the string pointed by digest.
+ * Since xor is commutative, this operation is used in order to
+ * "add" digests relative to unordered elements.
+ *
+ * So digest(a,b,c,d) will be the same of digest(b,a,c,d) */
+void xorDigest(unsigned char *digest, void *ptr, size_t len) {
+ SHA1_CTX ctx;
+ unsigned char hash[20], *s = ptr;
+ int j;
+
+ SHA1Init(&ctx);
+ SHA1Update(&ctx,s,len);
+ SHA1Final(hash,&ctx);
+
+ for (j = 0; j < 20; j++)
+ digest[j] ^= hash[j];
+}
+
+void xorObjectDigest(unsigned char *digest, robj *o) {
+ o = getDecodedObject(o);
+ xorDigest(digest,o->ptr,sdslen(o->ptr));
+ decrRefCount(o);
+}
+
+/* This function instead of just computing the SHA1 and xoring it
+ * against digest, also perform the digest of "digest" itself and
+ * replace the old value with the new one.
+ *
+ * So the final digest will be:
+ *
+ * digest = SHA1(digest xor SHA1(data))
+ *
+ * This function is used every time we want to preserve the order so
+ * that digest(a,b,c,d) will be different than digest(b,c,d,a)
+ *
+ * Also note that mixdigest("foo") followed by mixdigest("bar")
+ * will lead to a different digest compared to "fo", "obar".
+ */
+void mixDigest(unsigned char *digest, void *ptr, size_t len) {
+ SHA1_CTX ctx;
+ char *s = ptr;
+
+ xorDigest(digest,s,len);
+ SHA1Init(&ctx);
+ SHA1Update(&ctx,digest,20);
+ SHA1Final(digest,&ctx);
+}
+
+void mixObjectDigest(unsigned char *digest, robj *o) {
+ o = getDecodedObject(o);
+ mixDigest(digest,o->ptr,sdslen(o->ptr));
+ decrRefCount(o);
+}
+
+/* Compute the dataset digest. Since keys, sets elements, hashes elements
+ * are not ordered, we use a trick: every aggregate digest is the xor
+ * of the digests of their elements. This way the order will not change
+ * the result. For list instead we use a feedback entering the output digest
+ * as input in order to ensure that a different ordered list will result in
+ * a different digest. */
+void computeDatasetDigest(unsigned char *final) {
+ unsigned char digest[20];
+ char buf[128];
+ dictIterator *di = NULL;
+ dictEntry *de;
+ int j;
+ uint32_t aux;
+
+ memset(final,0,20); /* Start with a clean result */
+
+ for (j = 0; j < server.dbnum; j++) {
+ redisDb *db = server.db+j;
+
+ if (dictSize(db->dict) == 0) continue;
+ di = dictGetSafeIterator(db->dict);
+
+ /* hash the DB id, so the same dataset moved in a different
+ * DB will lead to a different digest */
+ aux = htonl(j);
+ mixDigest(final,&aux,sizeof(aux));
+
+ /* Iterate this DB writing every entry */
+ while((de = dictNext(di)) != NULL) {
+ sds key;
+ robj *keyobj, *o;
+ long long expiretime;
+
+ memset(digest,0,20); /* This key-val digest */
+ key = dictGetKey(de);
+ keyobj = createStringObject(key,sdslen(key));
+
+ mixDigest(digest,key,sdslen(key));
+
+ o = dictGetVal(de);
+
+ aux = htonl(o->type);
+ mixDigest(digest,&aux,sizeof(aux));
+ expiretime = getExpire(db,keyobj);
+
+ /* Save the key and associated value */
+ if (o->type == OBJ_STRING) {
+ mixObjectDigest(digest,o);
+ } else if (o->type == OBJ_LIST) {
+ listTypeIterator *li = listTypeInitIterator(o,0,LIST_TAIL);
+ listTypeEntry entry;
+ while(listTypeNext(li,&entry)) {
+ robj *eleobj = listTypeGet(&entry);
+ mixObjectDigest(digest,eleobj);
+ decrRefCount(eleobj);
+ }
+ listTypeReleaseIterator(li);
+ } else if (o->type == OBJ_SET) {
+ setTypeIterator *si = setTypeInitIterator(o);
+ sds sdsele;
+ while((sdsele = setTypeNextObject(si)) != NULL) {
+ xorDigest(digest,sdsele,sdslen(sdsele));
+ sdsfree(sdsele);
+ }
+ setTypeReleaseIterator(si);
+ } else if (o->type == OBJ_ZSET) {
+ unsigned char eledigest[20];
+
+ if (o->encoding == OBJ_ENCODING_ZIPLIST) {
+ unsigned char *zl = o->ptr;
+ unsigned char *eptr, *sptr;
+ unsigned char *vstr;
+ unsigned int vlen;
+ long long vll;
+ double score;
+
+ eptr = ziplistIndex(zl,0);
+ serverAssert(eptr != NULL);
+ sptr = ziplistNext(zl,eptr);
+ serverAssert(sptr != NULL);
+
+ while (eptr != NULL) {
+ serverAssert(ziplistGet(eptr,&vstr,&vlen,&vll));
+ score = zzlGetScore(sptr);
+
+ memset(eledigest,0,20);
+ if (vstr != NULL) {
+ mixDigest(eledigest,vstr,vlen);
+ } else {
+ ll2string(buf,sizeof(buf),vll);
+ mixDigest(eledigest,buf,strlen(buf));
+ }
+
+ snprintf(buf,sizeof(buf),"%.17g",score);
+ mixDigest(eledigest,buf,strlen(buf));
+ xorDigest(digest,eledigest,20);
+ zzlNext(zl,&eptr,&sptr);
+ }
+ } else if (o->encoding == OBJ_ENCODING_SKIPLIST) {
+ zset *zs = o->ptr;
+ dictIterator *di = dictGetIterator(zs->dict);
+ dictEntry *de;
+
+ while((de = dictNext(di)) != NULL) {
+ sds sdsele = dictGetKey(de);
+ double *score = dictGetVal(de);
+
+ snprintf(buf,sizeof(buf),"%.17g",*score);
+ memset(eledigest,0,20);
+ mixDigest(eledigest,sdsele,sdslen(sdsele));
+ mixDigest(eledigest,buf,strlen(buf));
+ xorDigest(digest,eledigest,20);
+ }
+ dictReleaseIterator(di);
+ } else {
+ serverPanic("Unknown sorted set encoding");
+ }
+ } else if (o->type == OBJ_HASH) {
+ hashTypeIterator *hi = hashTypeInitIterator(o);
+ while (hashTypeNext(hi) != C_ERR) {
+ unsigned char eledigest[20];
+ sds sdsele;
+
+ memset(eledigest,0,20);
+ sdsele = hashTypeCurrentObjectNewSds(hi,OBJ_HASH_KEY);
+ mixDigest(eledigest,sdsele,sdslen(sdsele));
+ sdsfree(sdsele);
+ sdsele = hashTypeCurrentObjectNewSds(hi,OBJ_HASH_VALUE);
+ mixDigest(eledigest,sdsele,sdslen(sdsele));
+ sdsfree(sdsele);
+ xorDigest(digest,eledigest,20);
+ }
+ hashTypeReleaseIterator(hi);
+ } else {
+ serverPanic("Unknown object type");
+ }
+ /* If the key has an expire, add it to the mix */
+ if (expiretime != -1) xorDigest(digest,"!!expire!!",10);
+ /* We can finally xor the key-val digest to the final digest */
+ xorDigest(final,digest,20);
+ decrRefCount(keyobj);
+ }
+ dictReleaseIterator(di);
+ }
+}
+
+void debugCommand(client *c) {
+ if (c->argc == 1) {
+ addReplyError(c,"You must specify a subcommand for DEBUG. Try DEBUG HELP for info.");
+ return;
+ }
+
+ if (!strcasecmp(c->argv[1]->ptr,"help")) {
+ void *blenp = addDeferredMultiBulkLength(c);
+ int blen = 0;
+ blen++; addReplyStatus(c,
+ "DEBUG <subcommand> arg arg ... arg. Subcommands:");
+ blen++; addReplyStatus(c,
+ "segfault -- Crash the server with sigsegv.");
+ blen++; addReplyStatus(c,
+ "panic -- Crash the server simulating a panic.");
+ blen++; addReplyStatus(c,
+ "restart -- Graceful restart: save config, db, restart.");
+ blen++; addReplyStatus(c,
+ "crash-and-recovery <milliseconds> -- Hard crash and restart after <milliseconds> delay.");
+ blen++; addReplyStatus(c,
+ "assert -- Crash by assertion failed.");
+ blen++; addReplyStatus(c,
+ "reload -- Save the RDB on disk and reload it back in memory.");
+ blen++; addReplyStatus(c,
+ "loadaof -- Flush the AOF buffers on disk and reload the AOF in memory.");
+ blen++; addReplyStatus(c,
+ "object <key> -- Show low level info about key and associated value.");
+ blen++; addReplyStatus(c,
+ "sdslen <key> -- Show low level SDS string info representing key and value.");
+ blen++; addReplyStatus(c,
+ "ziplist <key> -- Show low level info about the ziplist encoding.");
+ blen++; addReplyStatus(c,
+ "populate <count> [prefix] [size] -- Create <count> string keys named key:<num>. If a prefix is specified is used instead of the 'key' prefix.");
+ blen++; addReplyStatus(c,
+ "digest -- Outputs an hex signature representing the current DB content.");
+ blen++; addReplyStatus(c,
+ "sleep <seconds> -- Stop the server for <seconds>. Decimals allowed.");
+ blen++; addReplyStatus(c,
+ "set-active-expire (0|1) -- Setting it to 0 disables expiring keys in background when they are not accessed (otherwise the Redis behavior). Setting it to 1 reenables back the default.");
+ blen++; addReplyStatus(c,
+ "lua-always-replicate-commands (0|1) -- Setting it to 1 makes Lua replication defaulting to replicating single commands, without the script having to enable effects replication.");
+ blen++; addReplyStatus(c,
+ "error <string> -- Return a Redis protocol error with <string> as message. Useful for clients unit tests to simulate Redis errors.");
+ blen++; addReplyStatus(c,
+ "structsize -- Return the size of different Redis core C structures.");
+ blen++; addReplyStatus(c,
+ "htstats <dbid> -- Return hash table statistics of the specified Redis database.");
+ setDeferredMultiBulkLength(c,blenp,blen);
+ } else if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
+ *((char*)-1) = 'x';
+ } else if (!strcasecmp(c->argv[1]->ptr,"panic")) {
+ serverPanic("DEBUG PANIC called at Unix time %ld", time(NULL));
+ } else if (!strcasecmp(c->argv[1]->ptr,"restart") ||
+ !strcasecmp(c->argv[1]->ptr,"crash-and-recover"))
+ {
+ long long delay = 0;
+ if (c->argc >= 3) {
+ if (getLongLongFromObjectOrReply(c, c->argv[2], &delay, NULL)
+ != C_OK) return;
+ if (delay < 0) delay = 0;
+ }
+ int flags = !strcasecmp(c->argv[1]->ptr,"restart") ?
+ (RESTART_SERVER_GRACEFULLY|RESTART_SERVER_CONFIG_REWRITE) :
+ RESTART_SERVER_NONE;
+ restartServer(flags,delay);
+ addReplyError(c,"failed to restart the server. Check server logs.");
+ } else if (!strcasecmp(c->argv[1]->ptr,"oom")) {
+ void *ptr = zmalloc(ULONG_MAX); /* Should trigger an out of memory. */
+ zfree(ptr);
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"assert")) {
+ if (c->argc >= 3) c->argv[2] = tryObjectEncoding(c->argv[2]);
+ serverAssertWithInfo(c,c->argv[0],1 == 2);
+ } else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
+ if (rdbSave(server.rdb_filename,NULL) != C_OK) {
+ addReply(c,shared.err);
+ return;
+ }
+ emptyDb(-1,EMPTYDB_NO_FLAGS,NULL);
+ if (rdbLoad(server.rdb_filename,NULL) != C_OK) {
+ addReplyError(c,"Error trying to load the RDB dump");
+ return;
+ }
+ serverLog(LL_WARNING,"DB reloaded by DEBUG RELOAD");
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"loadaof")) {
+ if (server.aof_state == AOF_ON) flushAppendOnlyFile(1);
+ emptyDb(-1,EMPTYDB_NO_FLAGS,NULL);
+ if (loadAppendOnlyFile(server.aof_filename) != C_OK) {
+ addReply(c,shared.err);
+ return;
+ }
+ server.dirty = 0; /* Prevent AOF / replication */
+ serverLog(LL_WARNING,"Append Only File loaded by DEBUG LOADAOF");
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
+ dictEntry *de;
+ robj *val;
+ char *strenc;
+
+ if ((de = dictFind(c->db->dict,c->argv[2]->ptr)) == NULL) {
+ addReply(c,shared.nokeyerr);
+ return;
+ }
+ val = dictGetVal(de);
+ strenc = strEncoding(val->encoding);
+
+ char extra[128] = {0};
+ if (val->encoding == OBJ_ENCODING_QUICKLIST) {
+ char *nextra = extra;
+ int remaining = sizeof(extra);
+ quicklist *ql = val->ptr;
+ /* Add number of quicklist nodes */
+ int used = snprintf(nextra, remaining, " ql_nodes:%u", ql->len);
+ nextra += used;
+ remaining -= used;
+ /* Add average quicklist fill factor */
+ double avg = (double)ql->count/ql->len;
+ used = snprintf(nextra, remaining, " ql_avg_node:%.2f", avg);
+ nextra += used;
+ remaining -= used;
+ /* Add quicklist fill level / max ziplist size */
+ used = snprintf(nextra, remaining, " ql_ziplist_max:%d", ql->fill);
+ nextra += used;
+ remaining -= used;
+ /* Add isCompressed? */
+ int compressed = ql->compress != 0;
+ used = snprintf(nextra, remaining, " ql_compressed:%d", compressed);
+ nextra += used;
+ remaining -= used;
+ /* Add total uncompressed size */
+ unsigned long sz = 0;
+ for (quicklistNode *node = ql->head; node; node = node->next) {
+ sz += node->sz;
+ }
+ used = snprintf(nextra, remaining, " ql_uncompressed_size:%lu", sz);
+ nextra += used;
+ remaining -= used;
+ }
+
+ addReplyStatusFormat(c,
+ "Value at:%p refcount:%d "
+ "encoding:%s serializedlength:%zu "
+ "lru:%d lru_seconds_idle:%llu%s",
+ (void*)val, val->refcount,
+ strenc, rdbSavedObjectLen(val),
+ val->lru, estimateObjectIdleTime(val)/1000, extra);
+ } else if (!strcasecmp(c->argv[1]->ptr,"sdslen") && c->argc == 3) {
+ dictEntry *de;
+ robj *val;
+ sds key;
+
+ if ((de = dictFind(c->db->dict,c->argv[2]->ptr)) == NULL) {
+ addReply(c,shared.nokeyerr);
+ return;
+ }
+ val = dictGetVal(de);
+ key = dictGetKey(de);
+
+ if (val->type != OBJ_STRING || !sdsEncodedObject(val)) {
+ addReplyError(c,"Not an sds encoded string.");
+ } else {
+ addReplyStatusFormat(c,
+ "key_sds_len:%lld, key_sds_avail:%lld, key_zmalloc: %lld, "
+ "val_sds_len:%lld, val_sds_avail:%lld, val_zmalloc: %lld",
+ (long long) sdslen(key),
+ (long long) sdsavail(key),
+ (long long) sdsZmallocSize(key),
+ (long long) sdslen(val->ptr),
+ (long long) sdsavail(val->ptr),
+ (long long) getStringObjectSdsUsedMemory(val));
+ }
+ } else if (!strcasecmp(c->argv[1]->ptr,"ziplist") && c->argc == 3) {
+ robj *o;
+
+ if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nokeyerr))
+ == NULL) return;
+
+ if (o->encoding != OBJ_ENCODING_ZIPLIST) {
+ addReplyError(c,"Not an sds encoded string.");
+ } else {
+ ziplistRepr(o->ptr);
+ addReplyStatus(c,"Ziplist structure printed on stdout");
+ }
+ } else if (!strcasecmp(c->argv[1]->ptr,"populate") &&
+ c->argc >= 3 && c->argc <= 5) {
+ long keys, j;
+ robj *key, *val;
+ char buf[128];
+
+ if (getLongFromObjectOrReply(c, c->argv[2], &keys, NULL) != C_OK)
+ return;
+ dictExpand(c->db->dict,keys);
+ for (j = 0; j < keys; j++) {
+ long valsize = 0;
+ snprintf(buf,sizeof(buf),"%s:%lu",
+ (c->argc == 3) ? "key" : (char*)c->argv[3]->ptr, j);
+ key = createStringObject(buf,strlen(buf));
+ if (c->argc == 5)
+ if (getLongFromObjectOrReply(c, c->argv[4], &valsize, NULL) != C_OK)
+ return;
+ if (lookupKeyWrite(c->db,key) != NULL) {
+ decrRefCount(key);
+ continue;
+ }
+ snprintf(buf,sizeof(buf),"value:%lu",j);
+ if (valsize==0)
+ val = createStringObject(buf,strlen(buf));
+ else {
+ int buflen = strlen(buf);
+ val = createStringObject(NULL,valsize);
+ memcpy(val->ptr, buf, valsize<=buflen? valsize: buflen);
+ }
+ dbAdd(c->db,key,val);
+ signalModifiedKey(c->db,key);
+ decrRefCount(key);
+ }
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"digest") && c->argc == 2) {
+ unsigned char digest[20];
+ sds d = sdsempty();
+ int j;
+
+ computeDatasetDigest(digest);
+ for (j = 0; j < 20; j++)
+ d = sdscatprintf(d, "%02x",digest[j]);
+ addReplyStatus(c,d);
+ sdsfree(d);
+ } else if (!strcasecmp(c->argv[1]->ptr,"sleep") && c->argc == 3) {
+ double dtime = strtod(c->argv[2]->ptr,NULL);
+ long long utime = dtime*1000000;
+ struct timespec tv;
+
+ tv.tv_sec = utime / 1000000;
+ tv.tv_nsec = (utime % 1000000) * 1000;
+ nanosleep(&tv, NULL);
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"set-active-expire") &&
+ c->argc == 3)
+ {
+ server.active_expire_enabled = atoi(c->argv[2]->ptr);
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"lua-always-replicate-commands") &&
+ c->argc == 3)
+ {
+ server.lua_always_replicate_commands = atoi(c->argv[2]->ptr);
+ addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"error") && c->argc == 3) {
+ sds errstr = sdsnewlen("-",1);
+
+ errstr = sdscatsds(errstr,c->argv[2]->ptr);
+ errstr = sdsmapchars(errstr,"\n\r"," ",2); /* no newlines in errors. */
+ errstr = sdscatlen(errstr,"\r\n",2);
+ addReplySds(c,errstr);
+ } else if (!strcasecmp(c->argv[1]->ptr,"structsize") && c->argc == 2) {
+ sds sizes = sdsempty();
+ sizes = sdscatprintf(sizes,"bits:%d ",(sizeof(void*) == 8)?64:32);
+ sizes = sdscatprintf(sizes,"robj:%d ",(int)sizeof(robj));
+ sizes = sdscatprintf(sizes,"dictentry:%d ",(int)sizeof(dictEntry));
+ sizes = sdscatprintf(sizes,"sdshdr5:%d ",(int)sizeof(struct sdshdr5));
+ sizes = sdscatprintf(sizes,"sdshdr8:%d ",(int)sizeof(struct sdshdr8));
+ sizes = sdscatprintf(sizes,"sdshdr16:%d ",(int)sizeof(struct sdshdr16));
+ sizes = sdscatprintf(sizes,"sdshdr32:%d ",(int)sizeof(struct sdshdr32));
+ sizes = sdscatprintf(sizes,"sdshdr64:%d ",(int)sizeof(struct sdshdr64));
+ addReplyBulkSds(c,sizes);
+ } else if (!strcasecmp(c->argv[1]->ptr,"htstats") && c->argc == 3) {
+ long dbid;
+ sds stats = sdsempty();
+ char buf[4096];
+
+ if (getLongFromObjectOrReply(c, c->argv[2], &dbid, NULL) != C_OK)
+ return;
+ if (dbid < 0 || dbid >= server.dbnum) {
+ addReplyError(c,"Out of range database");
+ return;
+ }
+
+ stats = sdscatprintf(stats,"[Dictionary HT]\n");
+ dictGetStats(buf,sizeof(buf),server.db[dbid].dict);
+ stats = sdscat(stats,buf);
+
+ stats = sdscatprintf(stats,"[Expires HT]\n");
+ dictGetStats(buf,sizeof(buf),server.db[dbid].expires);
+ stats = sdscat(stats,buf);
+
+ addReplyBulkSds(c,stats);
+ } else {
+ addReplyErrorFormat(c, "Unknown DEBUG subcommand or wrong number of arguments for '%s'",
+ (char*)c->argv[1]->ptr);
+ }
+}
+
+/* =========================== Crash handling ============================== */
+
+void _serverAssert(const char *estr, const char *file, int line) {
+ bugReportStart();
+ serverLog(LL_WARNING,"=== ASSERTION FAILED ===");
+ serverLog(LL_WARNING,"==> %s:%d '%s' is not true",file,line,estr);
+#ifdef HAVE_BACKTRACE
+ server.assert_failed = estr;
+ server.assert_file = file;
+ server.assert_line = line;
+ serverLog(LL_WARNING,"(forcing SIGSEGV to print the bug report.)");
+#endif
+ *((char*)-1) = 'x';
+}
+
+void _serverAssertPrintClientInfo(const client *c) {
+ int j;
+
+ bugReportStart();
+ serverLog(LL_WARNING,"=== ASSERTION FAILED CLIENT CONTEXT ===");
+ serverLog(LL_WARNING,"client->flags = %d", c->flags);
+ serverLog(LL_WARNING,"client->fd = %d", c->fd);
+ serverLog(LL_WARNING,"client->argc = %d", c->argc);
+ for (j=0; j < c->argc; j++) {
+ char buf[128];
+ char *arg;
+
+ if (c->argv[j]->type == OBJ_STRING && sdsEncodedObject(c->argv[j])) {
+ arg = (char*) c->argv[j]->ptr;
+ } else {
+ snprintf(buf,sizeof(buf),"Object type: %u, encoding: %u",
+ c->argv[j]->type, c->argv[j]->encoding);
+ arg = buf;
+ }
+ serverLog(LL_WARNING,"client->argv[%d] = \"%s\" (refcount: %d)",
+ j, arg, c->argv[j]->refcount);
+ }
+}
+
+void serverLogObjectDebugInfo(const robj *o) {
+ serverLog(LL_WARNING,"Object type: %d", o->type);
+ serverLog(LL_WARNING,"Object encoding: %d", o->encoding);
+ serverLog(LL_WARNING,"Object refcount: %d", o->refcount);
+ if (o->type == OBJ_STRING && sdsEncodedObject(o)) {
+ serverLog(LL_WARNING,"Object raw string len: %zu", sdslen(o->ptr));
+ if (sdslen(o->ptr) < 4096) {
+ sds repr = sdscatrepr(sdsempty(),o->ptr,sdslen(o->ptr));
+ serverLog(LL_WARNING,"Object raw string content: %s", repr);
+ sdsfree(repr);
+ }
+ } else if (o->type == OBJ_LIST) {
+ serverLog(LL_WARNING,"List length: %d", (int) listTypeLength(o));
+ } else if (o->type == OBJ_SET) {
+ serverLog(LL_WARNING,"Set size: %d", (int) setTypeSize(o));
+ } else if (o->type == OBJ_HASH) {
+ serverLog(LL_WARNING,"Hash size: %d", (int) hashTypeLength(o));
+ } else if (o->type == OBJ_ZSET) {
+ serverLog(LL_WARNING,"Sorted set size: %d", (int) zsetLength(o));
+ if (o->encoding == OBJ_ENCODING_SKIPLIST)
+ serverLog(LL_WARNING,"Skiplist level: %d", (int) ((const zset*)o->ptr)->zsl->level);
+ }
+}
+
+void _serverAssertPrintObject(const robj *o) {
+ bugReportStart();
+ serverLog(LL_WARNING,"=== ASSERTION FAILED OBJECT CONTEXT ===");
+ serverLogObjectDebugInfo(o);
+}
+
+void _serverAssertWithInfo(const client *c, const robj *o, const char *estr, const char *file, int line) {
+ if (c) _serverAssertPrintClientInfo(c);
+ if (o) _serverAssertPrintObject(o);
+ _serverAssert(estr,file,line);
+}
+
+void _serverPanic(const char *file, int line, const char *msg, ...) {
+ va_list ap;
+ va_start(ap,msg);
+ char fmtmsg[256];
+ vsnprintf(fmtmsg,sizeof(fmtmsg),msg,ap);
+ va_end(ap);
+
+ bugReportStart();
+ serverLog(LL_WARNING,"------------------------------------------------");
+ serverLog(LL_WARNING,"!!! Software Failure. Press left mouse button to continue");
+ serverLog(LL_WARNING,"Guru Meditation: %s #%s:%d",fmtmsg,file,line);
+#ifdef HAVE_BACKTRACE
+ serverLog(LL_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
+#endif
+ serverLog(LL_WARNING,"------------------------------------------------");
+ *((char*)-1) = 'x';
+}
+
+void bugReportStart(void) {
+ if (server.bug_report_start == 0) {
+ serverLogRaw(LL_WARNING|LL_RAW,
+ "\n\n=== REDIS BUG REPORT START: Cut & paste starting from here ===\n");
+ server.bug_report_start = 1;
+ }
+}
+
+#ifdef HAVE_BACKTRACE
+static void *getMcontextEip(ucontext_t *uc) {
+#if defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
+ /* OSX < 10.6 */
+ #if defined(__x86_64__)
+ return (void*) uc->uc_mcontext->__ss.__rip;
+ #elif defined(__i386__)
+ return (void*) uc->uc_mcontext->__ss.__eip;
+ #else
+ return (void*) uc->uc_mcontext->__ss.__srr0;
+ #endif
+#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
+ /* OSX >= 10.6 */
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ return (void*) uc->uc_mcontext->__ss.__rip;
+ #else
+ return (void*) uc->uc_mcontext->__ss.__eip;
+ #endif
+#elif defined(__linux__)
+ /* Linux */
+ #if defined(__i386__)
+ return (void*) uc->uc_mcontext.gregs[14]; /* Linux 32 */
+ #elif defined(__X86_64__) || defined(__x86_64__)
+ return (void*) uc->uc_mcontext.gregs[16]; /* Linux 64 */
+ #elif defined(__ia64__) /* Linux IA64 */
+ return (void*) uc->uc_mcontext.sc_ip;
+ #elif defined(__arm__) /* Linux ARM */
+ return (void*) uc->uc_mcontext.arm_pc;
+ #endif
+#else
+ return NULL;
+#endif
+}
+
+void logStackContent(void **sp) {
+ int i;
+ for (i = 15; i >= 0; i--) {
+ unsigned long addr = (unsigned long) sp+i;
+ unsigned long val = (unsigned long) sp[i];
+
+ if (sizeof(long) == 4)
+ serverLog(LL_WARNING, "(%08lx) -> %08lx", addr, val);
+ else
+ serverLog(LL_WARNING, "(%016lx) -> %016lx", addr, val);
+ }
+}
+
+void logRegisters(ucontext_t *uc) {
+ serverLog(LL_WARNING|LL_RAW, "\n------ REGISTERS ------\n");
+
+/* OSX */
+#if defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
+ /* OSX AMD64 */
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ serverLog(LL_WARNING,
+ "\n"
+ "RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
+ "RDI:%016lx RSI:%016lx\nRBP:%016lx RSP:%016lx\n"
+ "R8 :%016lx R9 :%016lx\nR10:%016lx R11:%016lx\n"
+ "R12:%016lx R13:%016lx\nR14:%016lx R15:%016lx\n"
+ "RIP:%016lx EFL:%016lx\nCS :%016lx FS:%016lx GS:%016lx",
+ (unsigned long) uc->uc_mcontext->__ss.__rax,
+ (unsigned long) uc->uc_mcontext->__ss.__rbx,
+ (unsigned long) uc->uc_mcontext->__ss.__rcx,
+ (unsigned long) uc->uc_mcontext->__ss.__rdx,
+ (unsigned long) uc->uc_mcontext->__ss.__rdi,
+ (unsigned long) uc->uc_mcontext->__ss.__rsi,
+ (unsigned long) uc->uc_mcontext->__ss.__rbp,
+ (unsigned long) uc->uc_mcontext->__ss.__rsp,
+ (unsigned long) uc->uc_mcontext->__ss.__r8,
+ (unsigned long) uc->uc_mcontext->__ss.__r9,
+ (unsigned long) uc->uc_mcontext->__ss.__r10,
+ (unsigned long) uc->uc_mcontext->__ss.__r11,
+ (unsigned long) uc->uc_mcontext->__ss.__r12,
+ (unsigned long) uc->uc_mcontext->__ss.__r13,
+ (unsigned long) uc->uc_mcontext->__ss.__r14,
+ (unsigned long) uc->uc_mcontext->__ss.__r15,
+ (unsigned long) uc->uc_mcontext->__ss.__rip,
+ (unsigned long) uc->uc_mcontext->__ss.__rflags,
+ (unsigned long) uc->uc_mcontext->__ss.__cs,
+ (unsigned long) uc->uc_mcontext->__ss.__fs,
+ (unsigned long) uc->uc_mcontext->__ss.__gs
+ );
+ logStackContent((void**)uc->uc_mcontext->__ss.__rsp);
+ #else
+ /* OSX x86 */
+ serverLog(LL_WARNING,
+ "\n"
+ "EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
+ "EDI:%08lx ESI:%08lx EBP:%08lx ESP:%08lx\n"
+ "SS:%08lx EFL:%08lx EIP:%08lx CS :%08lx\n"
+ "DS:%08lx ES:%08lx FS :%08lx GS :%08lx",
+ (unsigned long) uc->uc_mcontext->__ss.__eax,
+ (unsigned long) uc->uc_mcontext->__ss.__ebx,
+ (unsigned long) uc->uc_mcontext->__ss.__ecx,
+ (unsigned long) uc->uc_mcontext->__ss.__edx,
+ (unsigned long) uc->uc_mcontext->__ss.__edi,
+ (unsigned long) uc->uc_mcontext->__ss.__esi,
+ (unsigned long) uc->uc_mcontext->__ss.__ebp,
+ (unsigned long) uc->uc_mcontext->__ss.__esp,
+ (unsigned long) uc->uc_mcontext->__ss.__ss,
+ (unsigned long) uc->uc_mcontext->__ss.__eflags,
+ (unsigned long) uc->uc_mcontext->__ss.__eip,
+ (unsigned long) uc->uc_mcontext->__ss.__cs,
+ (unsigned long) uc->uc_mcontext->__ss.__ds,
+ (unsigned long) uc->uc_mcontext->__ss.__es,
+ (unsigned long) uc->uc_mcontext->__ss.__fs,
+ (unsigned long) uc->uc_mcontext->__ss.__gs
+ );
+ logStackContent((void**)uc->uc_mcontext->__ss.__esp);
+ #endif
+/* Linux */
+#elif defined(__linux__)
+ /* Linux x86 */
+ #if defined(__i386__)
+ serverLog(LL_WARNING,
+ "\n"
+ "EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
+ "EDI:%08lx ESI:%08lx EBP:%08lx ESP:%08lx\n"
+ "SS :%08lx EFL:%08lx EIP:%08lx CS:%08lx\n"
+ "DS :%08lx ES :%08lx FS :%08lx GS:%08lx",
+ (unsigned long) uc->uc_mcontext.gregs[11],
+ (unsigned long) uc->uc_mcontext.gregs[8],
+ (unsigned long) uc->uc_mcontext.gregs[10],
+ (unsigned long) uc->uc_mcontext.gregs[9],
+ (unsigned long) uc->uc_mcontext.gregs[4],
+ (unsigned long) uc->uc_mcontext.gregs[5],
+ (unsigned long) uc->uc_mcontext.gregs[6],
+ (unsigned long) uc->uc_mcontext.gregs[7],
+ (unsigned long) uc->uc_mcontext.gregs[18],
+ (unsigned long) uc->uc_mcontext.gregs[17],
+ (unsigned long) uc->uc_mcontext.gregs[14],
+ (unsigned long) uc->uc_mcontext.gregs[15],
+ (unsigned long) uc->uc_mcontext.gregs[3],
+ (unsigned long) uc->uc_mcontext.gregs[2],
+ (unsigned long) uc->uc_mcontext.gregs[1],
+ (unsigned long) uc->uc_mcontext.gregs[0]
+ );
+ logStackContent((void**)uc->uc_mcontext.gregs[7]);
+ #elif defined(__X86_64__) || defined(__x86_64__)
+ /* Linux AMD64 */
+ serverLog(LL_WARNING,
+ "\n"
+ "RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
+ "RDI:%016lx RSI:%016lx\nRBP:%016lx RSP:%016lx\n"
+ "R8 :%016lx R9 :%016lx\nR10:%016lx R11:%016lx\n"
+ "R12:%016lx R13:%016lx\nR14:%016lx R15:%016lx\n"
+ "RIP:%016lx EFL:%016lx\nCSGSFS:%016lx",
+ (unsigned long) uc->uc_mcontext.gregs[13],
+ (unsigned long) uc->uc_mcontext.gregs[11],
+ (unsigned long) uc->uc_mcontext.gregs[14],
+ (unsigned long) uc->uc_mcontext.gregs[12],
+ (unsigned long) uc->uc_mcontext.gregs[8],
+ (unsigned long) uc->uc_mcontext.gregs[9],
+ (unsigned long) uc->uc_mcontext.gregs[10],
+ (unsigned long) uc->uc_mcontext.gregs[15],
+ (unsigned long) uc->uc_mcontext.gregs[0],
+ (unsigned long) uc->uc_mcontext.gregs[1],
+ (unsigned long) uc->uc_mcontext.gregs[2],
+ (unsigned long) uc->uc_mcontext.gregs[3],
+ (unsigned long) uc->uc_mcontext.gregs[4],
+ (unsigned long) uc->uc_mcontext.gregs[5],
+ (unsigned long) uc->uc_mcontext.gregs[6],
+ (unsigned long) uc->uc_mcontext.gregs[7],
+ (unsigned long) uc->uc_mcontext.gregs[16],
+ (unsigned long) uc->uc_mcontext.gregs[17],
+ (unsigned long) uc->uc_mcontext.gregs[18]
+ );
+ logStackContent((void**)uc->uc_mcontext.gregs[15]);
+ #endif
+#else
+ serverLog(LL_WARNING,
+ " Dumping of registers not supported for this OS/arch");
+#endif
+}
+
+/* Return a file descriptor to write directly to the Redis log with the
+ * write(2) syscall, that can be used in critical sections of the code
+ * where the rest of Redis can't be trusted (for example during the memory
+ * test) or when an API call requires a raw fd.
+ *
+ * Close it with closeDirectLogFiledes(). */
+int openDirectLogFiledes(void) {
+ int log_to_stdout = server.logfile[0] == '\0';
+ int fd = log_to_stdout ?
+ STDOUT_FILENO :
+ open(server.logfile, O_APPEND|O_CREAT|O_WRONLY, 0644);
+ return fd;
+}
+
+/* Used to close what closeDirectLogFiledes() returns. */
+void closeDirectLogFiledes(int fd) {
+ int log_to_stdout = server.logfile[0] == '\0';
+ if (!log_to_stdout) close(fd);
+}
+
+/* Logs the stack trace using the backtrace() call. This function is designed
+ * to be called from signal handlers safely. */
+void logStackTrace(ucontext_t *uc) {
+ void *trace[101];
+ int trace_size = 0, fd = openDirectLogFiledes();
+
+ if (fd == -1) return; /* If we can't log there is anything to do. */
+
+ /* Generate the stack trace */
+ trace_size = backtrace(trace+1, 100);
+
+ if (getMcontextEip(uc) != NULL) {
+ char *msg1 = "EIP:\n";
+ char *msg2 = "\nBacktrace:\n";
+ if (write(fd,msg1,strlen(msg1)) == -1) {/* Avoid warning. */};
+ trace[0] = getMcontextEip(uc);
+ backtrace_symbols_fd(trace, 1, fd);
+ if (write(fd,msg2,strlen(msg2)) == -1) {/* Avoid warning. */};
+ }
+
+ /* Write symbols to log file */
+ backtrace_symbols_fd(trace+1, trace_size, fd);
+
+ /* Cleanup */
+ closeDirectLogFiledes(fd);
+}
+
+/* Log information about the "current" client, that is, the client that is
+ * currently being served by Redis. May be NULL if Redis is not serving a
+ * client right now. */
+void logCurrentClient(void) {
+ if (server.current_client == NULL) return;
+
+ client *cc = server.current_client;
+ sds client;
+ int j;
+
+ serverLogRaw(LL_WARNING|LL_RAW, "\n------ CURRENT CLIENT INFO ------\n");
+ client = catClientInfoString(sdsempty(),cc);
+ serverLog(LL_WARNING|LL_RAW,"%s\n", client);
+ sdsfree(client);
+ for (j = 0; j < cc->argc; j++) {
+ robj *decoded;
+
+ decoded = getDecodedObject(cc->argv[j]);
+ serverLog(LL_WARNING|LL_RAW,"argv[%d]: '%s'\n", j,
+ (char*)decoded->ptr);
+ decrRefCount(decoded);
+ }
+ /* Check if the first argument, usually a key, is found inside the
+ * selected DB, and if so print info about the associated object. */
+ if (cc->argc >= 1) {
+ robj *val, *key;
+ dictEntry *de;
+
+ key = getDecodedObject(cc->argv[1]);
+ de = dictFind(cc->db->dict, key->ptr);
+ if (de) {
+ val = dictGetVal(de);
+ serverLog(LL_WARNING,"key '%s' found in DB containing the following object:", (char*)key->ptr);
+ serverLogObjectDebugInfo(val);
+ }
+ decrRefCount(key);
+ }
+}
+
+#if defined(HAVE_PROC_MAPS)
+
+#define MEMTEST_MAX_REGIONS 128
+
+/* A non destructive memory test executed during segfauls. */
+int memtest_test_linux_anonymous_maps(void) {
+ FILE *fp;
+ char line[1024];
+ char logbuf[1024];
+ size_t start_addr, end_addr, size;
+ size_t start_vect[MEMTEST_MAX_REGIONS];
+ size_t size_vect[MEMTEST_MAX_REGIONS];
+ int regions = 0, j;
+
+ int fd = openDirectLogFiledes();
+ if (!fd) return 0;
+
+ fp = fopen("/proc/self/maps","r");
+ if (!fp) return 0;
+ while(fgets(line,sizeof(line),fp) != NULL) {
+ char *start, *end, *p = line;
+
+ start = p;
+ p = strchr(p,'-');
+ if (!p) continue;
+ *p++ = '\0';
+ end = p;
+ p = strchr(p,' ');
+ if (!p) continue;
+ *p++ = '\0';
+ if (strstr(p,"stack") ||
+ strstr(p,"vdso") ||
+ strstr(p,"vsyscall")) continue;
+ if (!strstr(p,"00:00")) continue;
+ if (!strstr(p,"rw")) continue;
+
+ start_addr = strtoul(start,NULL,16);
+ end_addr = strtoul(end,NULL,16);
+ size = end_addr-start_addr;
+
+ start_vect[regions] = start_addr;
+ size_vect[regions] = size;
+ snprintf(logbuf,sizeof(logbuf),
+ "*** Preparing to test memory region %lx (%lu bytes)\n",
+ (unsigned long) start_vect[regions],
+ (unsigned long) size_vect[regions]);
+ if (write(fd,logbuf,strlen(logbuf)) == -1) { /* Nothing to do. */ }
+ regions++;
+ }
+
+ int errors = 0;
+ for (j = 0; j < regions; j++) {
+ if (write(fd,".",1) == -1) { /* Nothing to do. */ }
+ errors += memtest_preserving_test((void*)start_vect[j],size_vect[j],1);
+ if (write(fd, errors ? "E" : "O",1) == -1) { /* Nothing to do. */ }
+ }
+ if (write(fd,"\n",1) == -1) { /* Nothing to do. */ }
+
+ /* NOTE: It is very important to close the file descriptor only now
+ * because closing it before may result into unmapping of some memory
+ * region that we are testing. */
+ fclose(fp);
+ closeDirectLogFiledes(fd);
+ return errors;
+}
+#endif
+
+/* Scans the (assumed) x86 code starting at addr, for a max of `len`
+ * bytes, searching for E8 (callq) opcodes, and dumping the symbols
+ * and the call offset if they appear to be valid. */
+void dumpX86Calls(void *addr, size_t len) {
+ size_t j;
+ unsigned char *p = addr;
+ Dl_info info;
+ /* Hash table to best-effort avoid printing the same symbol
+ * multiple times. */
+ unsigned long ht[256] = {0};
+
+ if (len < 5) return;
+ for (j = 0; j < len-4; j++) {
+ if (p[j] != 0xE8) continue; /* Not an E8 CALL opcode. */
+ unsigned long target = (unsigned long)addr+j+5;
+ target += *((int32_t*)(p+j+1));
+ if (dladdr((void*)target, &info) != 0 && info.dli_sname != NULL) {
+ if (ht[target&0xff] != target) {
+ printf("Function at 0x%lx is %s\n",target,info.dli_sname);
+ ht[target&0xff] = target;
+ }
+ j += 4; /* Skip the 32 bit immediate. */
+ }
+ }
+}
+
+void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
+ ucontext_t *uc = (ucontext_t*) secret;
+ void *eip = getMcontextEip(uc);
+ sds infostring, clients;
+ struct sigaction act;
+ UNUSED(info);
+
+ bugReportStart();
+ serverLog(LL_WARNING,
+ "Redis %s crashed by signal: %d", REDIS_VERSION, sig);
+ if (eip != NULL) {
+ serverLog(LL_WARNING,
+ "Crashed running the instuction at: %p", eip);
+ }
+ if (sig == SIGSEGV || sig == SIGBUS) {
+ serverLog(LL_WARNING,
+ "Accessing address: %p", (void*)info->si_addr);
+ }
+ serverLog(LL_WARNING,
+ "Failed assertion: %s (%s:%d)", server.assert_failed,
+ server.assert_file, server.assert_line);
+
+ /* Log the stack trace */
+ serverLogRaw(LL_WARNING|LL_RAW, "\n------ STACK TRACE ------\n");
+ logStackTrace(uc);
+
+ /* Log INFO and CLIENT LIST */
+ serverLogRaw(LL_WARNING|LL_RAW, "\n------ INFO OUTPUT ------\n");
+ infostring = genRedisInfoString("all");
+ serverLogRaw(LL_WARNING|LL_RAW, infostring);
+ serverLogRaw(LL_WARNING|LL_RAW, "\n------ CLIENT LIST OUTPUT ------\n");
+ clients = getAllClientsInfoString();
+ serverLogRaw(LL_WARNING|LL_RAW, clients);
+ sdsfree(infostring);
+ sdsfree(clients);
+
+ /* Log the current client */
+ logCurrentClient();
+
+ /* Log dump of processor registers */
+ logRegisters(uc);
+
+#if defined(HAVE_PROC_MAPS)
+ /* Test memory */
+ serverLogRaw(LL_WARNING|LL_RAW, "\n------ FAST MEMORY TEST ------\n");
+ bioKillThreads();
+ if (memtest_test_linux_anonymous_maps()) {
+ serverLogRaw(LL_WARNING|LL_RAW,
+ "!!! MEMORY ERROR DETECTED! Check your memory ASAP !!!\n");
+ } else {
+ serverLogRaw(LL_WARNING|LL_RAW,
+ "Fast memory test PASSED, however your memory can still be broken. Please run a memory test for several hours if possible.\n");
+ }
+#endif
+
+ if (eip != NULL) {
+ Dl_info info;
+ if (dladdr(eip, &info) != 0) {
+ serverLog(LL_WARNING|LL_RAW,
+ "\n------ DUMPING CODE AROUND EIP ------\n"
+ "Symbol: %s (base: %p)\n"
+ "Module: %s (base %p)\n"
+ "$ xxd -r -p /tmp/dump.hex /tmp/dump.bin\n"
+ "$ objdump --adjust-vma=%p -D -b binary -m i386:x86-64 /tmp/dump.bin\n"
+ "------\n",
+ info.dli_sname, info.dli_saddr, info.dli_fname, info.dli_fbase,
+ info.dli_saddr);
+ size_t len = (long)eip - (long)info.dli_saddr;
+ unsigned long sz = sysconf(_SC_PAGESIZE);
+ if (len < 1<<13) { /* we don't have functions over 8k (verified) */
+ /* Find the address of the next page, which is our "safety"
+ * limit when dumping. Then try to dump just 128 bytes more
+ * than EIP if there is room, or stop sooner. */
+ unsigned long next = ((unsigned long)eip + sz) & ~(sz-1);
+ unsigned long end = (unsigned long)eip + 128;
+ if (end > next) end = next;
+ len = end - (unsigned long)info.dli_saddr;
+ serverLogHexDump(LL_WARNING, "dump of function",
+ info.dli_saddr ,len);
+ dumpX86Calls(info.dli_saddr,len);
+ }
+ }
+ }
+
+ serverLogRaw(LL_WARNING|LL_RAW,
+"\n=== REDIS BUG REPORT END. Make sure to include from START to END. ===\n\n"
+" Please report the crash by opening an issue on github:\n\n"
+" http://github.com/antirez/redis/issues\n\n"
+" Suspect RAM error? Use redis-server --test-memory to verify it.\n\n"
+);
+
+ /* free(messages); Don't call free() with possibly corrupted memory. */
+ if (server.daemonize && server.supervised == 0) unlink(server.pidfile);
+
+ /* Make sure we exit with the right signal at the end. So for instance
+ * the core will be dumped if enabled. */
+ sigemptyset (&act.sa_mask);
+ act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
+ act.sa_handler = SIG_DFL;
+ sigaction (sig, &act, NULL);
+ kill(getpid(),sig);
+}
+#endif /* HAVE_BACKTRACE */
+
+/* ==================== Logging functions for debugging ===================== */
+
+void serverLogHexDump(int level, char *descr, void *value, size_t len) {
+ char buf[65], *b;
+ unsigned char *v = value;
+ char charset[] = "0123456789abcdef";
+
+ serverLog(level,"%s (hexdump of %zu bytes):", descr, len);
+ b = buf;
+ while(len) {
+ b[0] = charset[(*v)>>4];
+ b[1] = charset[(*v)&0xf];
+ b[2] = '\0';
+ b += 2;
+ len--;
+ v++;
+ if (b-buf == 64 || len == 0) {
+ serverLogRaw(level|LL_RAW,buf);
+ b = buf;
+ }
+ }
+ serverLogRaw(level|LL_RAW,"\n");
+}
+
+/* =========================== Software Watchdog ============================ */
+#include <sys/time.h>
+
+void watchdogSignalHandler(int sig, siginfo_t *info, void *secret) {
+#ifdef HAVE_BACKTRACE
+ ucontext_t *uc = (ucontext_t*) secret;
+#endif
+ UNUSED(info);
+ UNUSED(sig);
+
+ serverLogFromHandler(LL_WARNING,"\n--- WATCHDOG TIMER EXPIRED ---");
+#ifdef HAVE_BACKTRACE
+ logStackTrace(uc);
+#else
+ serverLogFromHandler(LL_WARNING,"Sorry: no support for backtrace().");
+#endif
+ serverLogFromHandler(LL_WARNING,"--------\n");
+}
+
+/* Schedule a SIGALRM delivery after the specified period in milliseconds.
+ * If a timer is already scheduled, this function will re-schedule it to the
+ * specified time. If period is 0 the current timer is disabled. */
+void watchdogScheduleSignal(int period) {
+ struct itimerval it;
+
+ /* Will stop the timer if period is 0. */
+ it.it_value.tv_sec = period/1000;
+ it.it_value.tv_usec = (period%1000)*1000;
+ /* Don't automatically restart. */
+ it.it_interval.tv_sec = 0;
+ it.it_interval.tv_usec = 0;
+ setitimer(ITIMER_REAL, &it, NULL);
+}
+
+/* Enable the software watchdog with the specified period in milliseconds. */
+void enableWatchdog(int period) {
+ int min_period;
+
+ if (server.watchdog_period == 0) {
+ struct sigaction act;
+
+ /* Watchdog was actually disabled, so we have to setup the signal
+ * handler. */
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = SA_ONSTACK | SA_SIGINFO;
+ act.sa_sigaction = watchdogSignalHandler;
+ sigaction(SIGALRM, &act, NULL);
+ }
+ /* If the configured period is smaller than twice the timer period, it is
+ * too short for the software watchdog to work reliably. Fix it now
+ * if needed. */
+ min_period = (1000/server.hz)*2;
+ if (period < min_period) period = min_period;
+ watchdogScheduleSignal(period); /* Adjust the current timer. */
+ server.watchdog_period = period;
+}
+
+/* Disable the software watchdog. */
+void disableWatchdog(void) {
+ struct sigaction act;
+ if (server.watchdog_period == 0) return; /* Already disabled. */
+ watchdogScheduleSignal(0); /* Stop the current timer. */
+
+ /* Set the signal handler to SIG_IGN, this will also remove pending
+ * signals from the queue. */
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = 0;
+ act.sa_handler = SIG_IGN;
+ sigaction(SIGALRM, &act, NULL);
+ server.watchdog_period = 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-30 15:55:19 +0000