When trying to load a module with "mod -s" without its separated debug info file installed, the crash utility will abort as below: crash> mod -s kpatch_test kpatch_test.ko ... terminate called after throwing an instance of 'std::logic_error' what(): basic_string::_M_construct null not valid Aborted (core dumped) Let's return the std::string() instead of std::string(NULL) when a string is null, because the check_specified_kernel_debug_file() may return NULL. Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt; --- gdb-10.2.patch | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/gdb-10.2.patch b/gdb-10.2.patch index 577f5e45fc5a..f0034ed626a0 100644 --- a/gdb-10.2.patch +++ b/gdb-10.2.patch @@ -9,6 +9,7 @@ # to all subsequent patch applications. tar xvzmf gdb-10.2.tar.gz \ + gdb-10.2/gdb/symfile.c \ gdb-10.2/gdb/Makefile.in exit 0 @@ -1650,3 +1651,13 @@ exit 0 c_print_type_1 (type->field (i).type (), TYPE_FIELD_NAME (type, i), +--- gdb-10.2/gdb/symfile.c.orig ++++ gdb-10.2/gdb/symfile.c +@@ -1610,7 +1610,7 @@ find_separate_debug_file_by_debuglink (struct objfile *objfile) + if (debugfile.empty ()) { + char *name_copy; + name_copy = check_specified_kernel_debug_file(); +- return std::string (name_copy); ++ return name_copy ? std::string (name_copy) : std::string (); + } + #endif -- 2.37.1