#ifdef HAVE_BACKTRACE
#include <execinfo.h>
#include <ucontext.h>
+#include <fcntl.h>
#endif /* HAVE_BACKTRACE */
/* ================================= Debugging ============================== */
mixDigest(digest,key,sdslen(key));
- /* Make sure the key is loaded if VM is active */
o = dictGetVal(de);
aux = htonl(o->type);
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);
#ifdef HAVE_BACKTRACE
static void *getMcontextEip(ucontext_t *uc) {
-#if defined(__FreeBSD__)
- return (void*) uc->uc_mcontext.mc_eip;
-#elif defined(__dietlibc__)
- return (void*) uc->uc_mcontext.eip;
-#elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
- #if __x86_64__
+#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 __i386__
+ #elif defined(__i386__)
return (void*) uc->uc_mcontext->__ss.__eip;
- #else
+ #else
return (void*) uc->uc_mcontext->__ss.__srr0;
- #endif
+ #endif
#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
- #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ /* OSX >= 10.6 */
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
return (void*) uc->uc_mcontext->__ss.__rip;
- #else
+ #else
return (void*) uc->uc_mcontext->__ss.__eip;
- #endif
-#elif defined(__i386__)
+ #endif
+#elif defined(__linux__)
+ /* Linux */
+ #if defined(__i386__)
return (void*) uc->uc_mcontext.gregs[14]; /* Linux 32 */
-#elif defined(__X86_64__) || defined(__x86_64__)
+ #elif defined(__X86_64__) || defined(__x86_64__)
return (void*) uc->uc_mcontext.gregs[16]; /* Linux 64 */
-#elif defined(__ia64__) /* Linux IA64 */
+ #elif defined(__ia64__) /* Linux IA64 */
return (void*) uc->uc_mcontext.sc_ip;
+ #endif
#else
return NULL;
#endif
void logRegisters(ucontext_t *uc) {
redisLog(REDIS_WARNING, "--- REGISTERS");
+
+/* OSX */
#if defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
- #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
+ /* OSX AMD64 */
+ #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
redisLog(REDIS_WARNING,
"\n"
"RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
uc->uc_mcontext->__ss.__gs
);
logStackContent((void**)uc->uc_mcontext->__ss.__rsp);
- #else
+ #else
+ /* OSX x86 */
redisLog(REDIS_WARNING,
"\n"
"EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
uc->uc_mcontext->__ss.__gs
);
logStackContent((void**)uc->uc_mcontext->__ss.__esp);
- #endif
-#elif defined(__i386__)
+ #endif
+/* Linux */
+#elif defined(__linux__)
+ /* Linux x86 */
+ #if defined(__i386__)
redisLog(REDIS_WARNING,
"\n"
"EAX:%08lx EBX:%08lx ECX:%08lx EDX:%08lx\n"
uc->uc_mcontext.gregs[0]
);
logStackContent((void**)uc->uc_mcontext.gregs[7]);
-#elif defined(__X86_64__) || defined(__x86_64__)
+ #elif defined(__X86_64__) || defined(__x86_64__)
+ /* Linux AMD64 */
redisLog(REDIS_WARNING,
"\n"
"RAX:%016lx RBX:%016lx\nRCX:%016lx RDX:%016lx\n"
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
}
-void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
+/* 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];
- char **messages = NULL;
- int i, trace_size = 0;
+ 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);
+ }
+}
+
+void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
ucontext_t *uc = (ucontext_t*) secret;
sds infostring, clients;
struct sigaction act;
" Failed assertion: %s (%s:%d)", server.assert_failed,
server.assert_file, server.assert_line);
- /* Generate the stack trace */
- trace_size = backtrace(trace, 100);
-
- /* overwrite sigaction with caller's address */
- if (getMcontextEip(uc) != NULL) {
- trace[1] = getMcontextEip(uc);
- }
- messages = backtrace_symbols(trace, trace_size);
+ /* Log the stack trace */
redisLog(REDIS_WARNING, "--- STACK TRACE");
- for (i=1; i<trace_size; ++i)
- redisLog(REDIS_WARNING,"%s", messages[i]);
+ logStackTrace(uc);
/* Log INFO and CLIENT LIST */
redisLog(REDIS_WARNING, "--- INFO OUTPUT");
redisLog(REDIS_WARNING, "--- CLIENT LIST OUTPUT");
clients = getAllClientsInfoString();
redisLogRaw(REDIS_WARNING, clients);
- /* Don't sdsfree() strings to avoid a crash. Memory may be corrupted. */
+ sdsfree(infostring);
+ sdsfree(clients);
- /* Log CURRENT CLIENT info */
- if (server.current_client) {
- redisClient *cc = server.current_client;
- sds client;
- int j;
-
- redisLog(REDIS_WARNING, "--- CURRENT CLIENT INFO");
- client = getClientInfoString(cc);
- redisLog(REDIS_WARNING,"client: %s", client);
- /* Missing sdsfree(client) to avoid crash if memory is corrupted. */
- 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);
- }
- }
+ /* Log the current client */
+ logCurrentClient();
/* Log dump of processor registers */
logRegisters(uc);
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"
+" 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);
- /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
- * is used. Otherwise, sa_handler is used */
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 watchdong 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/REDIS_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;
+}
projects / redis.git / blobdiff