On Tue, Jan 05, 2021 at 12:52:48AM -0800, Nadav Amit wrote:

quoted

On Jan 5, 2021, at 12:13 AM, Peter Zijlstra [off-list ref] wrote:

On Mon, Jan 04, 2021 at 02:24:38PM -0500, Andrea Arcangeli wrote:

quoted

The problematic one not pictured is the one of the wrprotect that has
to be running in another CPU which is also isn't picture above. More
accurate traces are posted later in the thread.

What thread? I don't seem to have discovered it yet, and the cover
letter from Nadav doesn't seem to have a msgid linking it either.

Sorry for that:

https://lore.kernel.org/lkml/X+K7JMrTEC9SpVIB@google.com/T/ (local)

Much reading later..

OK, go with the write-lock for now.