Looks to be more than just Haswell. I was wondering this too, and just noticed this comment on the (fix) patch: "the problem (user space deadlocks) can be seen

Looks to be more than just Haswell. I was wondering this too, and just noticed this comment on the (fix) patch: "the problem (user space deadlocks) can be seen with Android bionic's mutex implementation on an arm64 multi-cluster system."