On Wed, Jul 28, 2021 at 7:45 PM Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > to roll out 5.4.135 on a few of the hosts, and encounter a rare "WARNING: CPU ... PID ... at kthread_is_per_cpu+0x1c/0x20" splat (see full dmesg below) > > > > Previous kernel I was running there, never seeing that, was 5.4.114 > > Can you narrow this down to a specific commit using 'git bisect'? Not set up for it, but can try - I normally build from .tar.xz's. Given the WARNING seems to take a day to happen, it'll take a while to bisect that by commits. I'll try to revert that one 5.4.118 change in kernel/sched/fair.c, in parallel. best regards Patrick
