Unable to Compile Kernel

[dslm4515]

Kernel 6.3 fails to compile with LLVM ( LLVM=1 LLVM_IAS=1 make):

make[3]: 'install_headers' is up to date.
  LD [M]  arch/x86/events/amd/amd-uncore.o
ld.lld: error: arch/x86/events/amd/uncore.o: invalid symbol index
make[4]: *** [scripts/Makefile.build:452: arch/x86/events/amd/amd-uncore.o] Error 1
make[3]: *** [scripts/Makefile.build:494: arch/x86/events/amd] Error 2
make[2]: *** [scripts/Makefile.build:494: arch/x86/events] Error 2
make[1]: *** [scripts/Makefile.build:494: arch/x86] Error 2
make: *** [Makefile:2025: .] Error 2

Let's try GCC & binutils (installed in /opt/gnu):

make[3]: 'install_headers' is up to date.
  LD [M]  arch/x86/events/amd/amd-uncore.o
ld: arch/x86/events/amd/uncore.o: bad reloc symbol index (0x6d >= 0x6d) for offset 0x3 in section `.text'
ld: arch/x86/events/amd/uncore.o: bad reloc symbol index (0x6d >= 0x6d) for offset 0x3 in section `.text'
ld: failed to set dynamic section sizes: bad value
make[4]: *** [scripts/Makefile.build:452: arch/x86/events/amd/amd-uncore.o] Error 1
make[3]: *** [scripts/Makefile.build:494: arch/x86/events/amd] Error 2
make[2]: *** [scripts/Makefile.build:494: arch/x86/events] Error 2
make[1]: *** [scripts/Makefile.build:494: arch/x86] Error 2
make: *** [Makefile:2025: .] Error 2

Or LLVM+elftoolschain? (LLVM=1 make)

make[3]: 'install_headers' is up to date.
  LD [M]  arch/x86/events/amd/amd-uncore.o
ld.lld: error: arch/x86/events/amd/uncore.o: invalid symbol index
make[4]: *** [scripts/Makefile.build:452: arch/x86/events/amd/amd-uncore.o] Error 1
make[3]: *** [scripts/Makefile.build:494: arch/x86/events/amd] Error 2
make[2]: *** [scripts/Makefile.build:494: arch/x86/events] Error 2
make[1]: *** [scripts/Makefile.build:494: arch/x86] Error 2
make: *** [Makefile:2025: .] Error 2

Maybe a typo or bug in kernel 6.3? Same errors for kernel 6.3.2

BUT kernel 6.1.8 compiles fine (LLVM=1 LLVM_IAS=1 make).

[dslm4515]

Let's disable CONFIG_PERF_EVENTS_AMD_UNCORE in the kernel config...

Compile goes a bit further but another error found:

make[3]: 'install_headers' is up to date.
  AR      arch/x86/built-in.a
  LD [M]  arch/x86/kvm/kvm.o
ld.lld: error: arch/x86/kvm/x86.o: invalid symbol index
make[3]: *** [scripts/Makefile.build:452: arch/x86/kvm/kvm.o] Error 1
make[2]: *** [scripts/Makefile.build:494: arch/x86/kvm] Error 2
make[1]: *** [scripts/Makefile.build:494: arch/x86] Error 2
make: *** [Makefile:2025: .] Error 2

[dslm4515]

Let's disable virtualization, CONFIG_VIRTUALIZATION...

so far no errors...

... another obstacle:

make[3]: 'install_headers' is up to date.
  LD [M]  crypto/ecdh_generic.o
ld.lld: error: crypto/ecdh.o: invalid symbol index
make[2]: *** [scripts/Makefile.build:452: crypto/ecdh_generic.o] Error 1
make[1]: *** [scripts/Makefile.build:494: crypto] Error 2
make[1]: *** Waiting for unfinished jobs....
  LD [M]  fs/isofs/isofs.o
  LD [M]  fs/squashfs/squashfs.o
ld.lld: error: fs/isofs/inode.o: invalid symbol index
make[3]: *** [scripts/Makefile.build:452: fs/isofs/isofs.o] Error 1
make[2]: *** [scripts/Makefile.build:494: fs/isofs] Error 2
make[2]: *** Waiting for unfinished jobs....
ld.lld: error: fs/squashfs/cache.o: invalid symbol index
make[3]: *** [scripts/Makefile.build:452: fs/squashfs/squashfs.o] Error 1
make[2]: *** [scripts/Makefile.build:494: fs/squashfs] Error 2
make[1]: *** [scripts/Makefile.build:494: fs] Error 2
make: *** [Makefile:2025: .] Error 2

[dslm4515]

So far ...
6.1.8 -> No errors. Success
6.1.29 -> No errors. Success
6.2.9 -> fail
6.3.0 -> fail
6.3.2 -> fail
6.3.3 -> Fail
6.4-r2 -> Fail

Used the same kernel config for each kernel version. I made sure to run LLVM=1 make oldconfig to make sure kernel config was compatible with the source tree.

Looks like starting with kernel version 6.2.x, the same errors pop up

[takusuman]

I haven't played around with LLVM in a while, but what about using Clang/Clang++ with GNU Binutils? I know it's not the ideal, but it would be a workaround while the LLVM and elftoolchain folks doesn't fix this bug.

Funny enough, Linux v6.1.8 compiles fine, per what you've said, so we could also just go with it instead of insisting in other versions.
By the way, what about v5.15.103? Does it also compile fine?

[dslm4515]

That's true. I have tried other combinations but not yet LLVM+Binutils. That will be my next test

[dslm4515]

Same issue with LLVM+Binutils, "invalid symbol index"

[cement-drinker]

is it an issue with the linker?

[dslm4515]

is it an issue with the linker?

If kernel version 6.1.29 compiles fine, I would like to say no... unless something in the kernel source changed starting with 6.2.x and later.

[cement-drinker]

Kernel updates are usually big, so maybe something did. Lets first try a diff linker (eg. mold), and if that doesnt work, follow alpine linux

[cement-drinker]

update: mold requires a SSL library for libcrypto, and that doesnt need to be in a toolchain. probably compile libreSSL and clang, and then compile mold, then proceed with the rest of stage2

[dslm4515]

Wow. Never heard of mold... Ha, I guess I might consider replacing LLD with mold.

Let's just say I'm not a fan of rust, so I'm impressed mold is coded in c++

[cement-drinker]

Mold might not be the reason this is happening. There are some patches on chimera linux for the latest kernel, so lets try those