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debug.c
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debug.c
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/*
* 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>
#ifndef __OpenBSD__
#include <ucontext.h>
#else
typedef ucontext_t sigcontext_t;
#endif
#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 xorStringObjectDigest(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 mixStringObjectDigest(unsigned char *digest, robj *o) {
o = getDecodedObject(o);
mixDigest(digest,o->ptr,sdslen(o->ptr));
decrRefCount(o);
}
/* This function computes the digest of a data structure stored in the
* object 'o'. It is the core of the DEBUG DIGEST command: when taking the
* digest of a whole dataset, we take the digest of the key and the value
* pair, and xor all those together.
*
* Note that this function does not reset the initial 'digest' passed, it
* will continue mixing this object digest to anything that was already
* present. */
void xorObjectDigest(redisDb *db, robj *keyobj, unsigned char *digest, robj *o) {
uint32_t aux = htonl(o->type);
mixDigest(digest,&aux,sizeof(aux));
long long expiretime = getExpire(db,keyobj);
char buf[128];
/* Save the key and associated value */
if (o->type == OBJ_STRING) {
mixStringObjectDigest(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);
mixStringObjectDigest(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 if (o->type == OBJ_STREAM) {
streamIterator si;
streamIteratorStart(&si,o->ptr,NULL,NULL,0);
streamID id;
int64_t numfields;
while(streamIteratorGetID(&si,&id,&numfields)) {
sds itemid = sdscatfmt(sdsempty(),"%U.%U",id.ms,id.seq);
mixDigest(digest,itemid,sdslen(itemid));
sdsfree(itemid);
while(numfields--) {
unsigned char *field, *value;
int64_t field_len, value_len;
streamIteratorGetField(&si,&field,&value,
&field_len,&value_len);
mixDigest(digest,field,field_len);
mixDigest(digest,value,value_len);
}
}
streamIteratorStop(&si);
} else if (o->type == OBJ_MODULE) {
RedisModuleDigest md;
moduleValue *mv = o->ptr;
moduleType *mt = mv->type;
moduleInitDigestContext(md);
if (mt->digest) {
mt->digest(&md,mv->value);
xorDigest(digest,md.x,sizeof(md.x));
}
} else {
serverPanic("Unknown object type");
}
/* If the key has an expire, add it to the mix */
if (expiretime != -1) xorDigest(digest,"!!expire!!",10);
}
/* 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];
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;
memset(digest,0,20); /* This key-val digest */
key = dictGetKey(de);
keyobj = createStringObject(key,sdslen(key));
mixDigest(digest,key,sdslen(key));
o = dictGetVal(de);
xorObjectDigest(db,keyobj,digest,o);
/* 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 == 2 && !strcasecmp(c->argv[1]->ptr,"help")) {
const char *help[] = {
"ASSERT -- Crash by assertion failed.",
"CHANGE-REPL-ID -- Change the replication IDs of the instance. Dangerous, should be used only for testing the replication subsystem.",
"CRASH-AND-RECOVER <milliseconds> -- Hard crash and restart after <milliseconds> delay.",
"DIGEST -- Output a hex signature representing the current DB content.",
"DIGEST-VALUE <key-1> ... <key-N>-- Output a hex signature of the values of all the specified keys.",
"ERROR <string> -- Return a Redis protocol error with <string> as message. Useful for clients unit tests to simulate Redis errors.",
"LOG <message> -- write message to the server log.",
"HTSTATS <dbid> -- Return hash table statistics of the specified Redis database.",
"HTSTATS-KEY <key> -- Like htstats but for the hash table stored as key's value.",
"LOADAOF -- Flush the AOF buffers on disk and reload the AOF in memory.",
"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.",
"OBJECT <key> -- Show low level info about key and associated value.",
"PANIC -- Crash the server simulating a panic.",
"POPULATE <count> [prefix] [size] -- Create <count> string keys named key:<num>. If a prefix is specified is used instead of the 'key' prefix.",
"RELOAD -- Save the RDB on disk and reload it back in memory.",
"RESTART -- Graceful restart: save config, db, restart.",
"SDSLEN <key> -- Show low level SDS string info representing key and value.",
"SEGFAULT -- Crash the server with sigsegv.",
"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.",
"SLEEP <seconds> -- Stop the server for <seconds>. Decimals allowed.",
"STRUCTSIZE -- Return the size of different Redis core C structures.",
"ZIPLIST <key> -- Show low level info about the ziplist encoding.",
"STRINGMATCH-TEST -- Run a fuzz tester against the stringmatchlen() function.",
NULL
};
addReplyHelp(c, help);
} 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")) {
serverAssertWithInfo(c,c->argv[0],1 == 2);
} else if (!strcasecmp(c->argv[1]->ptr,"log") && c->argc == 3) {
serverLog(LL_WARNING, "DEBUG LOG: %s", (char*)c->argv[2]->ptr);
addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
rdbSaveInfo rsi, *rsiptr;
rsiptr = rdbPopulateSaveInfo(&rsi);
if (rdbSave(server.rdb_filename,rsiptr) != C_OK) {
addReply(c,shared.err);
return;
}
emptyDb(-1,EMPTYDB_NO_FLAGS,NULL);
protectClient(c);
int ret = rdbLoad(server.rdb_filename,NULL);
unprotectClient(c);
if (ret != 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_OFF) flushAppendOnlyFile(1);
emptyDb(-1,EMPTYDB_NO_FLAGS,NULL);
protectClient(c);
int ret = loadAppendOnlyFile(server.aof_filename);
unprotectClient(c);
if (ret != 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[138] = {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:%lu", 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) {
/* DEBUG DIGEST (form without keys specified) */
unsigned char digest[20];
sds d = sdsempty();
computeDatasetDigest(digest);
for (int i = 0; i < 20; i++) d = sdscatprintf(d, "%02x",digest[i]);
addReplyStatus(c,d);
sdsfree(d);
} else if (!strcasecmp(c->argv[1]->ptr,"digest-value") && c->argc >= 2) {
/* DEBUG DIGEST-VALUE key key key ... key. */
addReplyMultiBulkLen(c,c->argc-2);
for (int j = 2; j < c->argc; j++) {
unsigned char digest[20];
memset(digest,0,20); /* Start with a clean result */
robj *o = lookupKeyReadWithFlags(c->db,c->argv[j],LOOKUP_NOTOUCH);
if (o) xorObjectDigest(c->db,c->argv[j],digest,o);
sds d = sdsempty();
for (int i = 0; i < 20; i++) d = sdscatprintf(d, "%02x",digest[i]);
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 if (!strcasecmp(c->argv[1]->ptr,"htstats-key") && c->argc == 3) {
robj *o;
dict *ht = NULL;
if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nokeyerr))
== NULL) return;
/* Get the hash table reference from the object, if possible. */
switch (o->encoding) {
case OBJ_ENCODING_SKIPLIST:
{
zset *zs = o->ptr;
ht = zs->dict;
}
break;
case OBJ_ENCODING_HT:
ht = o->ptr;
break;
}
if (ht == NULL) {
addReplyError(c,"The value stored at the specified key is not "
"represented using an hash table");
} else {
char buf[4096];
dictGetStats(buf,sizeof(buf),ht);
addReplyBulkCString(c,buf);
}
} else if (!strcasecmp(c->argv[1]->ptr,"change-repl-id") && c->argc == 2) {
serverLog(LL_WARNING,"Changing replication IDs after receiving DEBUG change-repl-id");
changeReplicationId();
clearReplicationId2();
addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"stringmatch-test") && c->argc == 2)
{
stringmatchlen_fuzz_test();
addReplyStatus(c,"Apparently Redis did not crash: test passed");
} else {
addReplySubcommandSyntaxError(c);
return;
}
}
/* =========================== 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;
#elif defined(__aarch64__) /* Linux AArch64 */
return (void*) uc->uc_mcontext.pc;
#endif
#elif defined(__FreeBSD__)
/* FreeBSD */
#if defined(__i386__)
return (void*) uc->uc_mcontext.mc_eip;
#elif defined(__x86_64__)
return (void*) uc->uc_mcontext.mc_rip;
#endif
#elif defined(__OpenBSD__)
/* OpenBSD */
#if defined(__i386__)
return (void*) uc->sc_eip;
#elif defined(__x86_64__)
return (void*) uc->sc_rip;
#endif
#elif defined(__DragonFly__)
return (void*) uc->uc_mcontext.mc_rip;
#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
#elif defined(__FreeBSD__)
#if defined(__x86_64__)
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.mc_rax,
(unsigned long) uc->uc_mcontext.mc_rbx,
(unsigned long) uc->uc_mcontext.mc_rcx,
(unsigned long) uc->uc_mcontext.mc_rdx,
(unsigned long) uc->uc_mcontext.mc_rdi,
(unsigned long) uc->uc_mcontext.mc_rsi,
(unsigned long) uc->uc_mcontext.mc_rbp,
(unsigned long) uc->uc_mcontext.mc_rsp,
(unsigned long) uc->uc_mcontext.mc_r8,
(unsigned long) uc->uc_mcontext.mc_r9,
(unsigned long) uc->uc_mcontext.mc_r10,
(unsigned long) uc->uc_mcontext.mc_r11,
(unsigned long) uc->uc_mcontext.mc_r12,
(unsigned long) uc->uc_mcontext.mc_r13,
(unsigned long) uc->uc_mcontext.mc_r14,
(unsigned long) uc->uc_mcontext.mc_r15,
(unsigned long) uc->uc_mcontext.mc_rip,
(unsigned long) uc->uc_mcontext.mc_rflags,
(unsigned long) uc->uc_mcontext.mc_cs
);
logStackContent((void**)uc->uc_mcontext.mc_rsp);
#elif 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.mc_eax,
(unsigned long) uc->uc_mcontext.mc_ebx,
(unsigned long) uc->uc_mcontext.mc_ebx,
(unsigned long) uc->uc_mcontext.mc_edx,
(unsigned long) uc->uc_mcontext.mc_edi,
(unsigned long) uc->uc_mcontext.mc_esi,
(unsigned long) uc->uc_mcontext.mc_ebp,
(unsigned long) uc->uc_mcontext.mc_esp,
(unsigned long) uc->uc_mcontext.mc_ss,
(unsigned long) uc->uc_mcontext.mc_eflags,
(unsigned long) uc->uc_mcontext.mc_eip,
(unsigned long) uc->uc_mcontext.mc_cs,
(unsigned long) uc->uc_mcontext.mc_es,
(unsigned long) uc->uc_mcontext.mc_fs,
(unsigned long) uc->uc_mcontext.mc_gs
);
logStackContent((void**)uc->uc_mcontext.mc_esp);
#endif
#elif defined(__OpenBSD__)
#if defined(__x86_64__)
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->sc_rax,
(unsigned long) uc->sc_rbx,
(unsigned long) uc->sc_rcx,
(unsigned long) uc->sc_rdx,
(unsigned long) uc->sc_rdi,
(unsigned long) uc->sc_rsi,
(unsigned long) uc->sc_rbp,
(unsigned long) uc->sc_rsp,
(unsigned long) uc->sc_r8,
(unsigned long) uc->sc_r9,
(unsigned long) uc->sc_r10,
(unsigned long) uc->sc_r11,
(unsigned long) uc->sc_r12,
(unsigned long) uc->sc_r13,
(unsigned long) uc->sc_r14,