So, I responded and forgot to forward to the list. Fixing. Begin forwarded message: Date: Sun, 10 Apr 2022 18:59:24 -0700 From: stan <upaitag(a)zoho.com&gt; To: Sérgio Basto <sergio(a)serjux.com&gt; Subject: Re: kernel-5.18.0-0.rc1.20220408git1831fed559732b1.20.fc37.src.rpm fails to build locally On Sun, 10 Apr 2022 23:06:24 +0100 Sérgio Basto <sergio(a)serjux.com&gt; wrote: Thanks. I would never have figured that out. Or, at least it would have taken a long time. I'm using the default in the kernel spec, as far as I know. Which should be the rh flags with all hardening. + CFLAGS='-O2 -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' + LDFLAGS='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -Wl,--build-id=sha1 -Wl,-dT,/home/stan/rpmbuild/BUILD/kernel-5.18-rc1-184-g1831fed559732b1/.package_note-kernel-5.18.0-0.rc1.20220408git1831fed559732b1.20.20220410.fc37.x86_64.ld' This is a typical compilation stanza from the build: gcc -Wp,-MMD,arch/x86/realmode/.init.o.d -nostdinc -I./arch/x86/include -I./arch/x86/include/generated -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/compiler-version.h -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -fmacro-prefix-map=./= -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE <----------- -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Wno-format-security -std=gnu11 -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -fcf-protection=none -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mpreferred-stack-boundary=3 -mskip-rax-setup -mtune=generic -mno-red-zone -mcmodel=kernel -Wno-sign-compare -fno-asynchronous-unwind-tables -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-format-overflow -Wno-address-of-packed-member -O2 -fno-allow-store-data-races -Wframe-larger-than=2048 -fstack-protector-strong -Wimplicit-fallthrough=5 -Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable -fomit-frame-pointer -ftrivial-auto-var-init=zero -fno-stack-clash-protection -fzero-call-used-regs=used-gpr -fno-inline-functions-called-once -Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Wcast-function-type -Wno-stringop-truncation -Wno-stringop-overflow -Wno-restrict -Wno-maybe-uninitialized -Wno-alloc-size-larger-than -fno-strict-overflow -fno-stack-check -fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -Wno-packed-not-aligned -fplugin=./scripts/gcc-plugins/randomize_layout_plugin.so -fplugin=./scripts/gcc-plugins/stackleak_plugin.so -DRANDSTRUCT_PLUGIN -DSTACKLEAK_PLUGIN -fplugin-arg-stackleak_plugin-track-min-size=100 -fplugin-arg-stackleak_plugin-arch=x86 -DKBUILD_MODFILE='"arch/x86/realmode/init"' -DKBUILD_BASENAME='"init"' -DKBUILD_MODNAME='"init"' -D__KBUILD_MODNAME=kmod_init -c -o arch/x86/realmode/init.o arch/x86/realmode/init.c Could the -fno-PIE be the culprit?