kbuild's segmentation fault

[skunk73]

strace.log.gz
trying to compile virtualbox 5.2.28 with a patched 4.19.36 vanilla kernel leads to a segmentation fault:
skunk@mescalito ~/VirtualBox-5.2.28 $ kmk VBOX_BUILD_PUBLISHER=_Gentoo TOOL_GCC3_CC=x86_64-pc-linux-gnu-gcc TOOL_GCC3_CXX=x86_64-pc-linux-gnu-g++ TOOL_GCC3_AS=x86_64-pc-linux-gnu-gcc TOOL_GCC3_AR=x86_64-pc-linux-gnu-ar TOOL_GCC3_LD=x86_64-pc-linux-gnu-g++ TOOL_GCC3_LD_SYSMOD=x86_64-pc-linux-gnu-ld 'TOOL_GCC3_CFLAGS=-march=native -O2 -pipe' 'TOOL_GCC3_CXXFLAGS=-march=native -O2 -pipe' 'VBOX_GCC_OPT=-march=native -O2 -pipe' TOOL_YASM_AS=yasm KBUILD_VERBOSE=2 all build debug: VBOX_WITH_NO_GCC_WARNING_POLICY is enabled kBuild: Pass - Build Programs kBuild: Generating /home/skunk/VirtualBox-5.2.28/out/linux.amd64/release/obj/Runtime/errmsgdata.h from /home/skunk/VirtualBox-5.2.28/include/iprt/err.h /home/skunk/VirtualBox-5.2.28/include/VBox/err.h kmk_builtin_redirect -wo /home/skunk/VirtualBox-5.2.28/out/linux.amd64/release/obj/Runtime/errmsgdata.h -- /usr/bin/kmk_sed -f /home/skunk/VirtualBox-5.2.28/src/VBox/Runtime/common/err/errmsg.sed /home/skunk/VirtualBox-5.2.28/include/iprt/err.h /home/skunk/VirtualBox-5.2.28/include/VBox/err.h kmk: *** [/home/skunk/VirtualBox-5.2.28/src/VBox/Runtime/Makefile.kmk:3011: /home/skunk/VirtualBox-5.2.28/out/linux.amd64/release/obj/Runtime/errmsgdata.h] Segmentation fault The failing command: $(QUIET)$(REDIRECT) -wo $@ -- $(SED) -f $< $(filter %.h,$^) kmk: *** Deleting file '/home/skunk/VirtualBox-5.2.28/out/linux.amd64/release/obj/Runtime/errmsgdata.h'