Comment 9 for bug 1921141

It seems like ASLR is a contributing factor. See the 2021-01-31 entry on https://www.msys2.org/news/ . After adding -Wl,--disable-dynamicbase,--disable-high-entropy-va,--default-image-base-low to LINKFLAGS I couldn't reproduce the issue on four consecutive builds.

My Feb 18 install wasn't affected because, even though I installed it after that announcement, it still had binutils 2.35 for whatever reason.