MDEV-6479 stack traces in 10.1

Take into account that PIE binaries are loaded at some offset, so
addresses cannot be directly resolved with addr2line. Find this
offset and subtract it before resolving an address.

config.h.cmake

@@ -46,6 +46,7 @@
 #cmakedefine HAVE_INTTYPES_H 1
 #cmakedefine HAVE_KQUEUE 1
 #cmakedefine HAVE_LIMITS_H 1
+#cmakedefine HAVE_LINK_H 1
 #cmakedefine HAVE_LINUX_UNISTD_H 1
 #cmakedefine HAVE_LOCALE_H 1
 #cmakedefine HAVE_MALLOC_H 1

configure.cmake

@@ -188,6 +188,7 @@ CHECK_INCLUDE_FILES (grp.h HAVE_GRP_H)
 CHECK_INCLUDE_FILES (ieeefp.h HAVE_IEEEFP_H)
 CHECK_INCLUDE_FILES (inttypes.h HAVE_INTTYPES_H)
 CHECK_INCLUDE_FILES (langinfo.h HAVE_LANGINFO_H)
+CHECK_INCLUDE_FILES (link.h HAVE_LINK_H)
 CHECK_INCLUDE_FILES (linux/unistd.h HAVE_LINUX_UNISTD_H)
 CHECK_INCLUDE_FILES (linux/falloc.h HAVE_LINUX_FALLOC_H)
 CHECK_INCLUDE_FILES (limits.h HAVE_LIMITS_H)

mysys/CMakeLists.txt

@@ -71,7 +71,7 @@ ENDIF()
 
 ADD_CONVENIENCE_LIBRARY(mysys ${MYSYS_SOURCES})
 TARGET_LINK_LIBRARIES(mysys dbug strings mysys_ssl ${ZLIB_LIBRARY} 
- ${LIBNSL} ${LIBM} ${LIBRT} ${LIBSOCKET} ${LIBEXECINFO})
+ ${LIBNSL} ${LIBM} ${LIBRT} ${LIBDL} ${LIBSOCKET} ${LIBEXECINFO})
 DTRACE_INSTRUMENT(mysys)
 
 IF(HAVE_BFD_H)

mysys/my_addr_resolve.c

@@ -126,12 +126,20 @@ err:
 */
 #elif defined(MY_ADDR_RESOLVE_FORK)
 /*
-  yet another - just execute addr2line or eu-addr2line, whatever available,
-  pipe the addresses to it, and parse the output
+  yet another - just execute addr2line pipe the addresses to it, and parse the
+  output
 */
 
 #include <m_string.h>
 #include <ctype.h>
+
+#if defined(HAVE_LINK_H) && defined(HAVE_DLOPEN)
+#include <link.h>
+static ElfW(Addr) offset= 0;
+#else
+#define offset 0
+#endif
+
 static int in[2], out[2];
 static int initialized= 0;
 static char output[1024];
@@ -140,7 +148,7 @@ int my_addr_resolve(void *ptr, my_addr_loc *loc)
   char input[32], *s;
   size_t len;
 
-  len= my_snprintf(input, sizeof(input), "%p\n", ptr);
+  len= my_snprintf(input, sizeof(input), "%p\n", ptr - offset);
   if (write(in[1], input, len) <= 0)
     return 1;
   if (read(out[0], output, sizeof(output)) <= 0)
@@ -172,6 +180,12 @@ const char *my_addr_resolve_init()
   {
     pid_t pid;
 
+#if defined(HAVE_LINK_H) && defined(HAVE_DLOPEN)
+    struct link_map *lm = (struct link_map*) dlopen(0, RTLD_NOW);
+    if (lm)
+      offset= lm->l_addr;
+#endif
+
     if (pipe(in) < 0)
       return "pipe(in)";
     if (pipe(out) < 0)