[mark:stacktrace/tests 2/4] ld.lld: error: undefined symbol: kunit_kfree

[mark:stacktrace/tests 2/4] ld.lld: error: undefined symbol: kunit_kfree

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git stacktrace/tests
head:   224cbf0cef8a49306bab3f8723e83a207d43ad11
commit: 3d53466128c5609a49b1f0e4ae97f3c8e378133d [2/4] WIP: lib: add basic stacktrace tests
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20260422/202604221252.wQVekNRg-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260422/202604221252.wQVekNRg-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604221252.wQVekNRg-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: kunit_kfree
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(std_test_exit) in archive vmlinux.a
--
>> ld.lld: error: undefined symbol: kunit_log_append
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(std_test_exit) in archive vmlinux.a
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(std_test_exit) in archive vmlinux.a
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_unwind_reliable) in archive vmlinux.a
   >>> referenced 2 more times
--
>> ld.lld: error: undefined symbol: kunit_binary_ptr_assert_format
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_nounwind) in archive vmlinux.a
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_nounwind_tail) in archive vmlinux.a
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_nounwind_notail) in archive vmlinux.a
   >>> referenced 6 more times
--
>> ld.lld: error: undefined symbol: kunit_fail_assert_format
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_unwind) in archive vmlinux.a
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_unwind) in archive vmlinux.a
   >>> referenced by stacktrace_kunit.c
   >>>               lib/tests/stacktrace_kunit.o:(test_unwind_tail) in archive vmlinux.a
   >>> referenced 9 more times

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