On Wed, 2 Nov 2022 14:02:49 +0000 Leonid Ravich <leonid.ravich@xxxxxxxxxxxxxxxx> wrote: > >I'm guessing some driver's query_pkey op, but AFAIK we don't have any > >explicit pre-emption reenablements in the code - unless it is sneaky.. > trace infra uses preempt_disable_notrace/preempt_enable_notrace to disable/enable preemtion but my kernel compiled without CONFIG_PREEMPTION so this functions are only barriers - looks like the idea behind was to avoid involuntary preemtion but in our case it is a voluntary (there is a wait_for_completion in the query_pkey rabbit hole). > > so no scheduler here to warn about illegal migration. Well, you should be testing under different configs ;-) It would have given you the reason for the real bug. -- Steve
