On 11/23, Oleg Nesterov wrote: > > On 11/23, Oleg Nesterov wrote: > > > > On 11/23, Borislav Petkov wrote: > > > > > > where we end up with a zero PMD. RIP is corrupted too so we're somewhere > > > off in the fields. > > > > PMD = 0 is fine I guess, addr == 0 is not mapped. > > > > > Comment over thread_group_cputime() talks about dead tasks accounting > > > > This comment simply means that we also need to read the accumulated > > counters in tsk->signal. > > > > > which might be relevant as we're seeing not mapped page hierarchy so > > > something must have gone away recently but we try to look at it. > > > > This is called under ->siglock, we can't race with exit/etc. But this > > doesn't matter, it is not that we (say) get t == NULL or something like > > this. > > > > RIP == 0, and this looks "impossible", I do not see indirect function > > calls in this paths. > > Ah, I didn't notice you mentioned tip/master... so it looks as if > sched_class->update_curr is NULL?
Perhaps this is migration thread? stop_sched_class doesn't have ->update_curr. could you try to cat /proc/pid-of-migration-thread/stat on your machine? Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/