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Index: gdb-7.9.90.20150709/gdb/solib-svr4.c
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===================================================================
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--- gdb-7.9.90.20150709.orig/gdb/solib-svr4.c	2015-07-09 18:18:54.526417766 +0200
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+++ gdb-7.9.90.20150709/gdb/solib-svr4.c	2015-07-09 18:19:33.074746586 +0200
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@@ -1381,14 +1381,27 @@ svr4_read_so_list (CORE_ADDR lm, CORE_AD
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 	}
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       {
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-	struct bfd_build_id *build_id;
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+	struct bfd_build_id *build_id = NULL;
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 	strncpy (newobj->so_original_name, buffer, SO_NAME_MAX_PATH_SIZE - 1);
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 	newobj->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
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 	/* May get overwritten below.  */
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 	strcpy (newobj->so_name, newobj->so_original_name);
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-	build_id = build_id_addr_get (newobj->lm_info->l_ld);
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+	/* In the case the main executable was found according to its build-id
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+	   (from a core file) prevent loading a different build of a library
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+	   with accidentally the same SO_NAME.
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+
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+	   It suppresses bogus backtraces (and prints "??" there instead) if
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+	   the on-disk files no longer match the running program version.
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+
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+	   If the main executable was not loaded according to its build-id do
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+	   not do any build-id checking of the libraries.  There may be missing
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+	   build-ids dumped in the core file and we would map all the libraries
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+	   to the only existing file loaded that time - the executable.  */
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+	if (symfile_objfile != NULL
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+	    && (symfile_objfile->flags & OBJF_BUILD_ID_CORE_LOADED) != 0)
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+	  build_id = build_id_addr_get (newobj->lm_info->l_ld);
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 	if (build_id != NULL)
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 	  {
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 	    char *name, *build_id_filename;
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@@ -1403,23 +1416,7 @@ svr4_read_so_list (CORE_ADDR lm, CORE_AD
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 		xfree (name);
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 	      }
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 	    else
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-	      {
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-		debug_print_missing (newobj->so_name, build_id_filename);
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-
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-		/* In the case the main executable was found according to
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-		   its build-id (from a core file) prevent loading
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-		   a different build of a library with accidentally the
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-		   same SO_NAME.
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-
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-		   It suppresses bogus backtraces (and prints "??" there
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-		   instead) if the on-disk files no longer match the
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-		   running program version.  */
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-
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-		if (symfile_objfile != NULL
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-		    && (symfile_objfile->flags
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-			& OBJF_BUILD_ID_CORE_LOADED) != 0)
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-		  newobj->so_name[0] = 0;
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-	      }
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+	      debug_print_missing (newobj->so_name, build_id_filename);
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 	    xfree (build_id_filename);
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 	    xfree (build_id);