On Mon, Jul 29, 2019 at 10:15 PM Steven Rostedt wrote:
[snip]
> > If the problem was only with userstacktrace, it will be reasonable to
> > surround only the userstack unwinder. But the situation is similar to
> > the previous "tracing vs CR2" case. As Peter taught me in
> >
On Tue, 30 Jul 2019 11:00:42 +0900
Eiichi Tsukata wrote:
> Thanks for comments.
>
> On 2019/07/30 0:21, Steven Rostedt wrote:
> > On Mon, 29 Jul 2019 10:07:34 +0900
> > Eiichi Tsukata wrote:
> >
> >> If context tracking is enabled, causing page fault in preemptirq
> >> irq_enable or
Thanks for comments.
On 2019/07/30 0:21, Steven Rostedt wrote:
> On Mon, 29 Jul 2019 10:07:34 +0900
> Eiichi Tsukata wrote:
>
>> If context tracking is enabled, causing page fault in preemptirq
>> irq_enable or irq_disable events triggers the following RCU EQS warning.
>>
>> Reproducer:
>>
>>
On Tue, 30 Jul 2019 10:50:36 +0900
Eiichi Tsukata wrote:
> >
> > I think they already (try to) do that; see 'tracing_irq_cpu'.
> >
>
> Or you mean something like this?
> As for trace_hardirqs_off_caller:
You missed what Peter said.
>
> diff --git a/kernel/trace/trace_preemptirq.c
Thanks for comments.
On 2019/07/29 19:29, Peter Zijlstra wrote:
> On Sun, Jul 28, 2019 at 09:25:58PM -0700, Andy Lutomirski wrote:
>> On Sun, Jul 28, 2019 at 6:08 PM Eiichi Tsukata wrote:
>
>>> diff --git a/kernel/trace/trace_preemptirq.c
>>> b/kernel/trace/trace_preemptirq.c
>>> index
On Mon, 29 Jul 2019 10:07:34 +0900
Eiichi Tsukata wrote:
> If context tracking is enabled, causing page fault in preemptirq
> irq_enable or irq_disable events triggers the following RCU EQS warning.
>
> Reproducer:
>
> // CONFIG_PREEMPTIRQ_EVENTS=y
> // CONFIG_CONTEXT_TRACKING=y
> //
On Sun, Jul 28, 2019 at 09:25:58PM -0700, Andy Lutomirski wrote:
> On Sun, Jul 28, 2019 at 6:08 PM Eiichi Tsukata wrote:
> > diff --git a/kernel/trace/trace_preemptirq.c
> > b/kernel/trace/trace_preemptirq.c
> > index 4d8e99fdbbbe..031b51cb94d0 100644
> > --- a/kernel/trace/trace_preemptirq.c
>
On Sun, Jul 28, 2019 at 6:08 PM Eiichi Tsukata wrote:
>
> If context tracking is enabled, causing page fault in preemptirq
> irq_enable or irq_disable events triggers the following RCU EQS warning.
>
Yuck.
> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
> index
If context tracking is enabled, causing page fault in preemptirq
irq_enable or irq_disable events triggers the following RCU EQS warning.
Reproducer:
// CONFIG_PREEMPTIRQ_EVENTS=y
// CONFIG_CONTEXT_TRACKING=y
// CONFIG_RCU_EQS_DEBUG=y
# echo 1 > events/preemptirq/irq_disable/enable
#
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