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redis/src/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 "redis.h"
#include "sha1.h" /* SHA1 is used for DEBUG DIGEST */
#include "crc64.h"
#include <arpa/inet.h>
#include <signal.h>
#ifdef HAVE_BACKTRACE
#include <execinfo.h>
#include <ucontext.h>
#include <fcntl.h>
#include "bio.h"
#endif /* HAVE_BACKTRACE */
/* ================================= 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 = dictGetIterator(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 == REDIS_STRING) {
mixObjectDigest(digest,o);
} else if (o->type == REDIS_LIST) {
listTypeIterator *li = listTypeInitIterator(o,0,REDIS_TAIL);
listTypeEntry entry;
while(listTypeNext(li,&entry)) {
robj *eleobj = listTypeGet(&entry);
mixObjectDigest(digest,eleobj);
decrRefCount(eleobj);
}
listTypeReleaseIterator(li);
} else if (o->type == REDIS_SET) {
setTypeIterator *si = setTypeInitIterator(o);
robj *ele;
while((ele = setTypeNextObject(si)) != NULL) {
xorObjectDigest(digest,ele);
decrRefCount(ele);
}
setTypeReleaseIterator(si);
} else if (o->type == REDIS_ZSET) {
unsigned char eledigest[20];
if (o->encoding == REDIS_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);
redisAssert(eptr != NULL);
sptr = ziplistNext(zl,eptr);
redisAssert(sptr != NULL);
while (eptr != NULL) {
redisAssert(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 == REDIS_ENCODING_SKIPLIST) {
zset *zs = o->ptr;
dictIterator *di = dictGetIterator(zs->dict);
dictEntry *de;
while((de = dictNext(di)) != NULL) {
robj *eleobj = dictGetKey(de);
double *score = dictGetVal(de);
snprintf(buf,sizeof(buf),"%.17g",*score);
memset(eledigest,0,20);
mixObjectDigest(eledigest,eleobj);
mixDigest(eledigest,buf,strlen(buf));
xorDigest(digest,eledigest,20);
}
dictReleaseIterator(di);
} else {
redisPanic("Unknown sorted set encoding");
}
} else if (o->type == REDIS_HASH) {
hashTypeIterator *hi;
robj *obj;
hi = hashTypeInitIterator(o);
while (hashTypeNext(hi) != REDIS_ERR) {
unsigned char eledigest[20];
memset(eledigest,0,20);
obj = hashTypeCurrentObject(hi,REDIS_HASH_KEY);
mixObjectDigest(eledigest,obj);
decrRefCount(obj);
obj = hashTypeCurrentObject(hi,REDIS_HASH_VALUE);
mixObjectDigest(eledigest,obj);
decrRefCount(obj);
xorDigest(digest,eledigest,20);
}
hashTypeReleaseIterator(hi);
} else {
redisPanic("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(redisClient *c) {
if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
*((char*)-1) = 'x';
} 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]);
redisAssertWithInfo(c,c->argv[0],1 == 2);
} else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
if (rdbSave(server.rdb_filename) != REDIS_OK) {
addReply(c,shared.err);
return;
}
emptyDb();
if (rdbLoad(server.rdb_filename) != REDIS_OK) {
addReplyError(c,"Error trying to load the RDB dump");
return;
}
redisLog(REDIS_WARNING,"DB reloaded by DEBUG RELOAD");
addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"loadaof")) {
emptyDb();
if (loadAppendOnlyFile(server.aof_filename) != REDIS_OK) {
addReply(c,shared.err);
return;
}
server.dirty = 0; /* Prevent AOF / replication */
redisLog(REDIS_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);
addReplyStatusFormat(c,
"Value at:%p refcount:%d "
"encoding:%s serializedlength:%lld "
"lru:%d lru_seconds_idle:%lu",
(void*)val, val->refcount,
strenc, (long long) rdbSavedObjectLen(val),
val->lru, estimateObjectIdleTime(val));
} else if (!strcasecmp(c->argv[1]->ptr,"populate") && c->argc == 3) {
long keys, j;
robj *key, *val;
char buf[128];
if (getLongFromObjectOrReply(c, c->argv[2], &keys, NULL) != REDIS_OK)
return;
for (j = 0; j < keys; j++) {
snprintf(buf,sizeof(buf),"key:%lu",j);
key = createStringObject(buf,strlen(buf));
if (lookupKeyRead(c->db,key) != NULL) {
decrRefCount(key);
continue;
}
snprintf(buf,sizeof(buf),"value:%lu",j);
val = createStringObject(buf,strlen(buf));
dbAdd(c->db,key,val);
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;
usleep(utime);
addReply(c,shared.ok);
} else {
addReplyError(c,
"Syntax error, try DEBUG [SEGFAULT|OBJECT <key>|SWAPIN <key>|SWAPOUT <key>|RELOAD]");
}
}
/* =========================== Crash handling ============================== */
void _redisAssert(char *estr, char *file, int line) {
bugReportStart();
redisLog(REDIS_WARNING,"=== ASSERTION FAILED ===");
redisLog(REDIS_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;
redisLog(REDIS_WARNING,"(forcing SIGSEGV to print the bug report.)");
#endif
*((char*)-1) = 'x';
}
void _redisAssertPrintClientInfo(redisClient *c) {
int j;
bugReportStart();
redisLog(REDIS_WARNING,"=== ASSERTION FAILED CLIENT CONTEXT ===");
redisLog(REDIS_WARNING,"client->flags = %d", c->flags);
redisLog(REDIS_WARNING,"client->fd = %d", c->fd);
redisLog(REDIS_WARNING,"client->argc = %d", c->argc);
for (j=0; j < c->argc; j++) {
char buf[128];
char *arg;
if (c->argv[j]->type == REDIS_STRING &&
c->argv[j]->encoding == REDIS_ENCODING_RAW)
{
arg = (char*) c->argv[j]->ptr;
} else {
snprintf(buf,sizeof(buf),"Object type: %d, encoding: %d",
c->argv[j]->type, c->argv[j]->encoding);
arg = buf;
}
redisLog(REDIS_WARNING,"client->argv[%d] = \"%s\" (refcount: %d)",
j, arg, c->argv[j]->refcount);
}
}
void redisLogObjectDebugInfo(robj *o) {
redisLog(REDIS_WARNING,"Object type: %d", o->type);
redisLog(REDIS_WARNING,"Object encoding: %d", o->encoding);
redisLog(REDIS_WARNING,"Object refcount: %d", o->refcount);
if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_RAW) {
redisLog(REDIS_WARNING,"Object raw string len: %d", sdslen(o->ptr));
if (sdslen(o->ptr) < 4096)
redisLog(REDIS_WARNING,"Object raw string content: \"%s\"", (char*)o->ptr);
} else if (o->type == REDIS_LIST) {
redisLog(REDIS_WARNING,"List length: %d", (int) listTypeLength(o));
} else if (o->type == REDIS_SET) {
redisLog(REDIS_WARNING,"Set size: %d", (int) setTypeSize(o));
} else if (o->type == REDIS_HASH) {
redisLog(REDIS_WARNING,"Hash size: %d", (int) hashTypeLength(o));
} else if (o->type == REDIS_ZSET) {
redisLog(REDIS_WARNING,"Sorted set size: %d", (int) zsetLength(o));
if (o->encoding == REDIS_ENCODING_SKIPLIST)
redisLog(REDIS_WARNING,"Skiplist level: %d", (int) ((zset*)o->ptr)->zsl->level);
}
}
void _redisAssertPrintObject(robj *o) {
bugReportStart();
redisLog(REDIS_WARNING,"=== ASSERTION FAILED OBJECT CONTEXT ===");
redisLogObjectDebugInfo(o);
}
void _redisAssertWithInfo(redisClient *c, robj *o, char *estr, char *file, int line) {
if (c) _redisAssertPrintClientInfo(c);
if (o) _redisAssertPrintObject(o);
_redisAssert(estr,file,line);
}
void _redisPanic(char *msg, char *file, int line) {
bugReportStart();
redisLog(REDIS_WARNING,"------------------------------------------------");
redisLog(REDIS_WARNING,"!!! Software Failure. Press left mouse button to continue");
redisLog(REDIS_WARNING,"Guru Meditation: %s #%s:%d",msg,file,line);
#ifdef HAVE_BACKTRACE
redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
#endif
redisLog(REDIS_WARNING,"------------------------------------------------");
*((char*)-1) = 'x';
}
void bugReportStart(void) {
if (server.bug_report_start == 0) {
redisLog(REDIS_WARNING,
"\n\n=== REDIS BUG REPORT START: Cut & paste starting from here ===");
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;
#endif
#else
return NULL;
#endif
}
void logStackContent(void **sp) {
int i;
for (i = 15; i >= 0; i--) {
if (sizeof(long) == 4)
redisLog(REDIS_WARNING, "(%08lx) -> %08lx", sp+i, sp[i]);
else
redisLog(REDIS_WARNING, "(%016lx) -> %016lx", sp+i, sp[i]);
}
}
void logRegisters(ucontext_t *uc) {
redisLog(REDIS_WARNING, "--- REGISTERS");
/* OSX */
#if defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
/* OSX AMD64 */
#if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
redisLog(REDIS_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",
uc->uc_mcontext->__ss.__rax,
uc->uc_mcontext->__ss.__rbx,
uc->uc_mcontext->__ss.__rcx,
uc->uc_mcontext->__ss.__rdx,
uc->uc_mcontext->__ss.__rdi,
uc->uc_mcontext->__ss.__rsi,
uc->uc_mcontext->__ss.__rbp,
uc->uc_mcontext->__ss.__rsp,
uc->uc_mcontext->__ss.__r8,
uc->uc_mcontext->__ss.__r9,
uc->uc_mcontext->__ss.__r10,
uc->uc_mcontext->__ss.__r11,
uc->uc_mcontext->__ss.__r12,
uc->uc_mcontext->__ss.__r13,
uc->uc_mcontext->__ss.__r14,
uc->uc_mcontext->__ss.__r15,
uc->uc_mcontext->__ss.__rip,
uc->uc_mcontext->__ss.__rflags,
uc->uc_mcontext->__ss.__cs,
uc->uc_mcontext->__ss.__fs,
uc->uc_mcontext->__ss.__gs
);
logStackContent((void**)uc->uc_mcontext->__ss.__rsp);
#else
/* OSX x86 */
redisLog(REDIS_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",
uc->uc_mcontext->__ss.__eax,
uc->uc_mcontext->__ss.__ebx,
uc->uc_mcontext->__ss.__ecx,
uc->uc_mcontext->__ss.__edx,
uc->uc_mcontext->__ss.__edi,
uc->uc_mcontext->__ss.__esi,
uc->uc_mcontext->__ss.__ebp,
uc->uc_mcontext->__ss.__esp,
uc->uc_mcontext->__ss.__ss,
uc->uc_mcontext->__ss.__eflags,
uc->uc_mcontext->__ss.__eip,
uc->uc_mcontext->__ss.__cs,
uc->uc_mcontext->__ss.__ds,
uc->uc_mcontext->__ss.__es,
uc->uc_mcontext->__ss.__fs,
uc->uc_mcontext->__ss.__gs
);
logStackContent((void**)uc->uc_mcontext->__ss.__esp);
#endif
/* Linux */
#elif defined(__linux__)
/* Linux x86 */
#if defined(__i386__)
redisLog(REDIS_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",
uc->uc_mcontext.gregs[11],
uc->uc_mcontext.gregs[8],
uc->uc_mcontext.gregs[10],
uc->uc_mcontext.gregs[9],
uc->uc_mcontext.gregs[4],
uc->uc_mcontext.gregs[5],
uc->uc_mcontext.gregs[6],
uc->uc_mcontext.gregs[7],
uc->uc_mcontext.gregs[18],
uc->uc_mcontext.gregs[17],
uc->uc_mcontext.gregs[14],
uc->uc_mcontext.gregs[15],
uc->uc_mcontext.gregs[3],
uc->uc_mcontext.gregs[2],
uc->uc_mcontext.gregs[1],
uc->uc_mcontext.gregs[0]
);
logStackContent((void**)uc->uc_mcontext.gregs[7]);
#elif defined(__X86_64__) || defined(__x86_64__)
/* Linux AMD64 */
redisLog(REDIS_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",
uc->uc_mcontext.gregs[13],
uc->uc_mcontext.gregs[11],
uc->uc_mcontext.gregs[14],
uc->uc_mcontext.gregs[12],
uc->uc_mcontext.gregs[8],
uc->uc_mcontext.gregs[9],
uc->uc_mcontext.gregs[10],
uc->uc_mcontext.gregs[15],
uc->uc_mcontext.gregs[0],
uc->uc_mcontext.gregs[1],
uc->uc_mcontext.gregs[2],
uc->uc_mcontext.gregs[3],
uc->uc_mcontext.gregs[4],
uc->uc_mcontext.gregs[5],
uc->uc_mcontext.gregs[6],
uc->uc_mcontext.gregs[7],
uc->uc_mcontext.gregs[16],
uc->uc_mcontext.gregs[17],
uc->uc_mcontext.gregs[18]
);
logStackContent((void**)uc->uc_mcontext.gregs[15]);
#endif
#else
redisLog(REDIS_WARNING,
" Dumping of registers not supported for this OS/arch");
#endif
}
/* 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[100];
int trace_size = 0, fd;
/* Open the log file in append mode. */
fd = server.logfile ?
open(server.logfile, O_APPEND|O_CREAT|O_WRONLY, 0644) :
STDOUT_FILENO;
if (fd == -1) return;
/* Generate the stack trace */
trace_size = backtrace(trace, 100);
/* overwrite sigaction with caller's address */
if (getMcontextEip(uc) != NULL)
trace[1] = getMcontextEip(uc);
/* Write symbols to log file */
backtrace_symbols_fd(trace, trace_size, fd);
/* Cleanup */
if (server.logfile) close(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;
redisClient *cc = server.current_client;
sds client;
int j;
redisLog(REDIS_WARNING, "--- CURRENT CLIENT INFO");
client = getClientInfoString(cc);
redisLog(REDIS_WARNING,"client: %s", client);
sdsfree(client);
for (j = 0; j < cc->argc; j++) {
robj *decoded;
decoded = getDecodedObject(cc->argv[j]);
redisLog(REDIS_WARNING,"argv[%d]: '%s'", 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);
redisLog(REDIS_WARNING,"key '%s' found in DB containing the following object:", key->ptr);
redisLogObjectDebugInfo(val);
}
decrRefCount(key);
}
}
#if defined(HAVE_PROC_MAPS)
void memtest_non_destructive_invert(void *addr, size_t size);
void memtest_non_destructive_swap(void *addr, size_t size);
#define MEMTEST_MAX_REGIONS 128
int memtest_test_linux_anonymous_maps(void) {
FILE *fp = fopen("/proc/self/maps","r");
char line[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;
uint64_t crc1 = 0, crc2 = 0, crc3 = 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;
printf("Testing %lx %lu\n", start_vect[regions], size_vect[regions]);
regions++;
}
/* Test all the regions as an unique sequential region.
* 1) Take the CRC64 of the memory region. */
for (j = 0; j < regions; j++) {
crc1 = crc64(crc1,(void*)start_vect[j],size_vect[j]);
}
/* 2) Invert bits, swap adiacent words, swap again, invert bits.
* This is the error amplification step. */
for (j = 0; j < regions; j++)
memtest_non_destructive_invert((void*)start_vect[j],size_vect[j]);
for (j = 0; j < regions; j++)
memtest_non_destructive_swap((void*)start_vect[j],size_vect[j]);
for (j = 0; j < regions; j++)
memtest_non_destructive_swap((void*)start_vect[j],size_vect[j]);
for (j = 0; j < regions; j++)
memtest_non_destructive_invert((void*)start_vect[j],size_vect[j]);
/* 3) Take the CRC64 sum again. */
for (j = 0; j < regions; j++)
crc2 = crc64(crc2,(void*)start_vect[j],size_vect[j]);
/* 4) Swap + Swap again */
for (j = 0; j < regions; j++)
memtest_non_destructive_swap((void*)start_vect[j],size_vect[j]);
for (j = 0; j < regions; j++)
memtest_non_destructive_swap((void*)start_vect[j],size_vect[j]);
/* 5) Take the CRC64 sum again. */
for (j = 0; j < regions; j++)
crc3 = crc64(crc3,(void*)start_vect[j],size_vect[j]);
/* 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);
/* If the two CRC are not the same, we trapped a memory error. */
return crc1 != crc2 || crc2 != crc3;
}
#endif
void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
ucontext_t *uc = (ucontext_t*) secret;
sds infostring, clients;
struct sigaction act;
REDIS_NOTUSED(info);
bugReportStart();
redisLog(REDIS_WARNING,
" Redis %s crashed by signal: %d", REDIS_VERSION, sig);
redisLog(REDIS_WARNING,
" Failed assertion: %s (%s:%d)", server.assert_failed,
server.assert_file, server.assert_line);
/* Log the stack trace */
redisLog(REDIS_WARNING, "--- STACK TRACE");
logStackTrace(uc);
/* Log INFO and CLIENT LIST */
redisLog(REDIS_WARNING, "--- INFO OUTPUT");
infostring = genRedisInfoString("all");
infostring = sdscatprintf(infostring, "hash_init_value: %u\n",
dictGetHashFunctionSeed());
redisLogRaw(REDIS_WARNING, infostring);
redisLog(REDIS_WARNING, "--- CLIENT LIST OUTPUT");
clients = getAllClientsInfoString();
redisLogRaw(REDIS_WARNING, clients);
sdsfree(infostring);
sdsfree(clients);
/* Log the current client */
logCurrentClient();
/* Log dump of processor registers */
logRegisters(uc);
#if defined(HAVE_PROC_MAPS)
/* Test memory */
redisLog(REDIS_WARNING, "--- FAST MEMORY TEST");
bioKillThreads();
if (memtest_test_linux_anonymous_maps()) {
redisLog(REDIS_WARNING,
"!!! MEMORY ERROR DETECTED! Check your memory ASAP !!!");
} else {
redisLog(REDIS_WARNING,
"Fast memory test PASSED, however your memory can still be broken. Please run a memory test for several hours if possible.");
}
#endif
redisLog(REDIS_WARNING,
"\n=== REDIS BUG REPORT END. Make sure to include from START to END. ===\n\n"
" Please report the crash opening an issue on github:\n\n"
" http://github.com/antirez/redis/issues\n\n"
" Suspect RAM error? Use redis-server --test-memory to veryfy it.\n\n"
);
/* free(messages); Don't call free() with possibly corrupted memory. */
if (server.daemonize) 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 redisLogHexDump(int level, char *descr, void *value, size_t len) {
char buf[65], *b;
unsigned char *v = value;
char charset[] = "0123456789abcdef";
redisLog(level,"%s (hexdump):", descr);
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) {
redisLogRaw(level|REDIS_LOG_RAW,buf);
b = buf;
}
}
redisLogRaw(level|REDIS_LOG_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
REDIS_NOTUSED(info);
REDIS_NOTUSED(sig);
redisLogFromHandler(REDIS_WARNING,"\n--- WATCHDOG TIMER EXPIRED ---");
#ifdef HAVE_BACKTRACE
logStackTrace(uc);
#else
redisLogFromHandler(REDIS_WARNING,"Sorry: no support for backtrace().");
#endif
redisLogFromHandler(REDIS_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_NODEFER | 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;
}
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