MINOR: debug: report the number of entries in the backtrace

It's useful to get an indication of unresolved stuff or memory
corruption to have the apparent depth of the stack trace in the
output, especially if we dump nothing.

diff --git a/src/debug.c b/src/debug.c
index ec905377bde540d393f71634fcf78f06d86417e6..a16bd4f72a7e01a4bdb1bc544e2cd0be2beb9b19 100644 (file)
--- a/src/debug.c
+++ b/src/debug.c
@@ -111,7 +111,7 @@ void ha_thread_dump(struct buffer *buf, int thr, int calling_tid)
                   would produce similar output to the following: */
 
                if (nptrs)
-                       chunk_appendf(buf, "             call trace:\n");
+                       chunk_appendf(buf, "             call trace(%d):\n", nptrs);
 
 #ifndef USE_DL
                /* if we can't rely on dladdr1() we won't figure what level is