https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94129
--- Comment #7 from Matthias Klose <doko at debian dot org> --- $ gfortran-10 -flto -c program.f90 $ readelf -SW program.o | grep lto_.lto [ 6] .gnu.lto_.lto.c7eb6f75a94ea29a PROGBITS 0000000000000000 0000cc 000008 00 E 0 0 1 $ objdump -s -j .gnu.lto_.lto.c7eb6f75a94ea29a program.o program.o: file format elf64-x86-64 Contents of section .gnu.lto_.lto.c7eb6f75a94ea29a: 0000 09000000 01000100 ........ Yes, I get the very same stacktrace ending in lto_uncompression_zlib.