tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.core/stacktrace
head:   ee23ee068fe24272f77ff014181286db32179754
commit: 6f6b2fc2fbf712e39df84edc62265273259f8aa1 [28/32] livepatch: Simplify stack trace retrieval
config: s390-performance_defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 6f6b2fc2fbf712e39df84edc62265273259f8aa1
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=s390 

All errors (new ones prefixed by >>):

   kernel/livepatch/transition.o: In function `klp_try_switch_task':
>> transition.c:(.text+0x382): undefined reference to `stack_trace_save_tsk_reliable'

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation