Linux 6.9.5 build fails with LTO

[ruffi123456789]

OS: Arch
llvm: 17.0.6-5
lld: 17.0.6-1
Clang: 17.0.6-2

My config:
_distro=""
_version=""
_EXT_CONFIG_PATH=~/.config/frogminer/linux-tkg.cfg
_NUKR="true"
_git_mirror=""
_kernel_work_folder=""
_kernel_source_folder=""
CUSTOM_GCC_PATH=""
CUSTOM_LLVM_PATH=""
_force_all_threads="true"
_noccache="false"
_kernel_on_diet="false"
_modprobeddb="true"
_modprobeddb_db_path=~/.config/modprobed.db
_menunconfig="false"
_diffconfig=""
_diffconfig_name=""
_dracut_options="--lz4"
_configfile=""
_config_updating="olddefconfig"
_debugdisable="false"
_STRIP="true"
_cpusched="eevdf"
_compiler="llvm"
_libunwind_replace=""
_llvm_ias="1"
_lto_mode="full"
_preempt_rt=""
_preempt_rt_force=""
_sched_yield_type=""
_rr_interval=""
_ftracedisable="true"
_numadisable="true"
_misc_adds="true"
_tickless="1"
_acs_override=""
_bcachefs="false"
_ntsync="false"
_waydroid=""
_glitched_base="true"
_zenify="true"
_compileroptlevel="2"
_processor_opt="skylakex"
_cacule_rdb="false"
_cacule_rdb_interval="19"
_tt_high_hz="false"
_smt_nice=""
_eevdf_sched_ext_support="true"
_random_trust_cpu="true"
_timer_freq=""
_default_cpu_gov="ondemand"
_aggressive_ondemand="true"
_tcp_cong_alg=""
_custom_commandline="intel_pstate=passive kernel.split_lock_mitigate=0"
_clear_patches="true"
_openrgb="true"
_custom_pkgbase=""
_kernel_localversion=""
_NR_CPUS_value=""
_install_after_building="prompt"
_logging_use_script="yes"
_fsync_backport="true"
_fsync_legacy="true"
_fsync_futex2="false"
_zfsfix="true"
_runqueue_sharing=""
_irq_threading="false"
_mglru="true"
_community_patches=""
_user_patches="true"
_user_patches_no_confirm="false"
_config_fragments="true"
_config_fragments_no_confirm="false"

This worked previously, last version I got to compile with exactly these settings was 6.9.3. Although I think my clang got updated since then.

Now compilation fails when linking with these errors:

make[2]: *** [scripts/Makefile.modfinal:56: fs/nls/nls_ucs2_utils.ko] Error 139
make[2]: *** Deleting file 'fs/nls/nls_ucs2_utils.ko'
make[2]: *** Waiting for unfinished jobs....
BTF [M] fs/btrfs/btrfs.ko
BTF [M] crypto/cmac.ko
make[1]: *** [/home/acesls/Programs/linux-tkg/linux-src-git/Makefile:1860: modules] Error 2
make[1]: *** Waiting for unfinished jobs....
arch/x86/tools/insn_decoder_test: success: Decoded and checked 8697182 instructions
TEST posttest
arch/x86/tools/insn_sanity: Success: decoded and checked 1000000 random instructions with 0 errors (seed:0x5ea88295)make[2]: *** [scripts/Makefile.modfinal:56: fs/nls/nls_ucs2_utils.ko] Error 139
make[2]: *** Deleting file 'fs/nls/nls_ucs2_utils.ko'
make[2]: *** Waiting for unfinished jobs....
BTF [M] fs/btrfs/btrfs.ko
BTF [M] crypto/cmac.ko
make[1]: *** [/home/acesls/Programs/linux-tkg/linux-src-git/Makefile:1860: modules] Error 2
make[1]: *** Waiting for unfinished jobs....
arch/x86/tools/insn_decoder_test: success: Decoded and checked 8697182 instructions
TEST posttest
arch/x86/tools/insn_sanity: Success: decoded and checked 1000000 random instructions with 0 errors (seed:0x5ea88295)

make: *** [Makefile:240: __sub-make] Error 2
==> ERROR: A failure occurred in build().`

Trying the same with LTO thin gives another but similiar error:

make[2]: *** [scripts/Makefile.modfinal:56: lib/crypto/libcurve25519.ko] Error 139
make[2]: *** Deleting file 'lib/crypto/libcurve25519.ko'
make[2]: *** Waiting for unfinished jobs....
BTF [M] drivers/input/joystick/xpad.ko
make[2]: *** [scripts/Makefile.modfinal:56: drivers/pinctrl/intel/pinctrl-sunrisepoint.ko] Error 139
make[2]: *** Deleting file 'drivers/pinctrl/intel/pinctrl-sunrisepoint.ko'
make[1]: *** [/home/acesls/Programs/linux-tkg/linux-src-git/Makefile:1860: modules] Error 2
make[1]: *** Waiting for unfinished jobs....
arch/x86/tools/insn_decoder_test: success: Decoded and checked 7742882 instructions
TEST posttest
arch/x86/tools/insn_sanity: Success: decoded and checked 1000000 random instructions with 0 errors (seed:0x8dd1ba0c)

make: *** [Makefile:240: __sub-make] Error 2

Sadly I didn't save the whole log, but I will gladly recompile the Kernel to capture the log to post here if someone thinks that'll help.

Building the kernel with _lto_mode="no" works as expected

[ptr1337]

See:
acmel/dwarves#53

[sirlucjan]

Also: https://lore.kernel.org/all/ZnCWRMfRDMHqSxBb@x1/