Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

From: Linus Torvalds
Date: Sat Sep 09 2017 - 15:21:34 EST

On Sat, Sep 9, 2017 at 12:09 PM, Borislav Petkov <bp@xxxxxxxxx> wrote:
> Yeah, but we can't know what kind of speculative accesses happen between
> the removal from the mask and the actual flushing.

Indeed. The speculative kernel thread accesses while lazy could easily
trigger this.

And I guess those are pretty fundamental. So..