Some post-mortem: LLVM_DWARF_BIN="/opt/llvm-toolchain/bin/llvm-dwarfdump" module="drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko" Module has DW_ATE_unsigned_160 and DW_ATE_unsigned_1: $LLVM_DWARF_BIN $module | grep DW_AT_name | grep DW_ATE_ | sort -u DW_AT_name ("DW_ATE_signed_32") DW_AT_name ("DW_ATE_signed_64") DW_AT_name ("DW_ATE_unsigned_1") DW_AT_name ("DW_ATE_unsigned_128") DW_AT_name ("DW_ATE_unsigned_16") DW_AT_name ("DW_ATE_unsigned_160") DW_AT_name ("DW_ATE_unsigned_32") DW_AT_name ("DW_ATE_unsigned_64") vmlinux has only DW_ATE_unsigned_1: $ $LLVM_DWARF_BIN vmlinux | grep DW_AT_name | grep DW_ATE_ | sort -u DW_AT_name ("DW_ATE_signed_1") DW_AT_name ("DW_ATE_signed_16") DW_AT_name ("DW_ATE_signed_32") DW_AT_name ("DW_ATE_signed_64") DW_AT_name ("DW_ATE_signed_8") DW_AT_name ("DW_ATE_unsigned_1") DW_AT_name ("DW_ATE_unsigned_128") DW_AT_name ("DW_ATE_unsigned_16") DW_AT_name ("DW_ATE_unsigned_24") DW_AT_name ("DW_ATE_unsigned_32") DW_AT_name ("DW_ATE_unsigned_40") DW_AT_name ("DW_ATE_unsigned_64") DW_AT_name ("DW_ATE_unsigned_8") - Sedat -