better bug report info on crash (backported from unstable)

3 files changed, 49 insertions, 8 deletions

diff --git a/src/debug.c b/src/debug.c
index b937cd3b0..3d20cddd8 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -337,15 +337,20 @@ void debugCommand(redisClient *c) {
 }
 
 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
-    redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
+    server.assert_failed = estr;
+    server.assert_file = file;
+    server.assert_line = line;
+    redisLog(REDIS_WARNING,"(forcing SIGSEGV to print the bug report.)");
     *((char*)-1) = 'x';
 #endif
 }
 
 void _redisPanic(char *msg, char *file, int line) {
+    bugReportStart();
     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
diff --git a/src/redis.c b/src/redis.c
index 95eb57baf..903354e35 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -886,6 +886,12 @@ void initServerConfig() {
     /* Slow log */
     server.slowlog_log_slower_than = REDIS_SLOWLOG_LOG_SLOWER_THAN;
     server.slowlog_max_len = REDIS_SLOWLOG_MAX_LEN;
+
+    /* Assert */
+    server.assert_failed = "<no assertion failed>";
+    server.assert_file = "<no file>";
+    server.assert_line = 0;
+    server.bug_report_start = 0;
 }
 
 void initServer() {
@@ -1703,32 +1709,56 @@ static void *getMcontextEip(ucontext_t *uc) {
 #endif
 }
 
+void bugReportStart(void) {
+    if (server.bug_report_start == 0) {
+        redisLog(REDIS_WARNING,
+            "=== REDIS BUG REPORT START: Cut & paste starting from here ===");
+        server.bug_report_start = 1;
+    }
+}
+
 static void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
     void *trace[100];
     char **messages = NULL;
     int i, trace_size = 0;
     ucontext_t *uc = (ucontext_t*) secret;
-    sds infostring;
+    sds infostring, clients;
     struct sigaction act;
     REDIS_NOTUSED(info);
 
+    bugReportStart();
     redisLog(REDIS_WARNING,
-        "======= Ooops! Redis %s got signal: -%d- =======", REDIS_VERSION, sig);
-    infostring = genRedisInfoString();
-    redisLog(REDIS_WARNING, "%s",infostring);
-    /* It's not safe to sdsfree() the returned string under memory
-     * corruption conditions. Let it leak as we are going to abort */
+        "    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);
 
+    /* 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);
-
+    redisLog(REDIS_WARNING, "--- STACK TRACE");
     for (i=1; i<trace_size; ++i)
         redisLog(REDIS_WARNING,"%s", messages[i]);
 
+    /* Log INFO and CLIENT LIST */
+    redisLog(REDIS_WARNING, "--- INFO OUTPUT");
+    infostring = genRedisInfoString();
+    redisLog(REDIS_WARNING, infostring);
+    redisLog(REDIS_WARNING, "--- CLIENT LIST OUTPUT");
+    clients = getAllClientsInfoString();
+    redisLog(REDIS_WARNING, clients);
+    /* Don't sdsfree() strings to avoid a crash. Memory may be corrupted. */
+
+    redisLog(REDIS_WARNING,
+"=== 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"
+);
     /* free(messages); Don't call free() with possibly corrupted memory. */
     if (server.daemonize) unlink(server.pidfile);
 
diff --git a/src/redis.h b/src/redis.h
index aff39fc77..6090860d6 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -236,6 +236,7 @@
 #define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 void _redisAssert(char *estr, char *file, int line);
 void _redisPanic(char *msg, char *file, int line);
+void bugReportStart(void);
 
 /*-----------------------------------------------------------------------------
  * Data types
@@ -534,6 +535,11 @@ struct redisServer {
     /* Misc */
     unsigned lruclock:22;        /* clock incrementing every minute, for LRU */
     unsigned lruclock_padding:10;
+    /* Assert & bug reportign */
+    char *assert_failed;
+    char *assert_file;
+    int assert_line;
+    int bug_report_start; /* True if bug report header already logged. */
 };
 
 typedef struct pubsubPattern {