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Message-ID: <20141123172256.GA9625@redhat.com> Date: Sun, 23 Nov 2014 18:22:56 +0100 From: Oleg Nesterov <oleg@...hat.com> To: Borislav Petkov <bp@...en8.de> Cc: lkml <linux-kernel@...r.kernel.org>, Rik van Riel <riel@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, x86-ml <x86@...nel.org> Subject: Re: task_stat splat 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. > [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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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