On 11/16/21 18:08, John David Anglin wrote: > On 2021-11-16 10:31 a.m., John David Anglin wrote: >> I don't know what's wrong with it. I have reverted it for now. > I think problem must be with cache flush range. Not sure. Seems like reverting SIGRETURN_TRAMP back to 4 fixes it. Anyway, I'll revert the whole patch for now. Maybe we can fix it in v5.17. Helge