[fedora-arm] Could thread-local storage be broken in Rawhide aarch64?

[Richard W.M. Jones]

Don't install systemd-227-1.fc24 on aarch64 systems. It crashes when
it starts up:

https://bugzilla.redhat.com/show_bug.cgi?id=1271387

Investigating this bug, it looks as if it crashes when it reads a
static '_Thread_local' variable.

So this might indicate some sort of gcc / toolchain issue in aarch64.
FWIW the broken version of systemd was compiled with:

gcc 5.1.1-4.fc23
binutils 0:2.25.1-7.fc24

gcc is older than the latest version in arm.koji.

I tried experimenting with writing a simple TLS program, but didn't
manage to reproduce the problem so far.

Rich.