Messages in this thread | | | Date | Sun, 23 Nov 2014 18:56:41 +0100 | From | Oleg Nesterov <> | Subject | Re: task_stat splat |
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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?
> > > [42460.389625] Call Trace: > > [42460.389635] [<ffffffff810813d9>] ? task_sched_runtime+0x99/0xc0 > > [42460.389643] [<ffffffff81088b5c>] thread_group_cputime+0x17c/0x2d0 > > Could you identify somehow the line which matches task_sched_runtime+0x99 ? > Probably do_task_delta_exec()... > > Oleg.
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