Re: [PATCH v3 0/5] ARM64: Add kernel probes(Kprobes) support

[David Long]

On 12/03/14 17:54, David Long wrote:
> On 12/03/14 09:54, William Cohen wrote:
> > On 12/01/2014 04:37 AM, Masami Hiramatsu wrote:
> > > (2014/11/29 1:01), Steve Capper wrote:

[...]

> > > > That would explain why the state of play of the interrupts is in an
> > > > unexpected state in the crash I reported:
> > > > "The point of failure in the panic was:
> > > > fs/buffer.c:1257
> > > >
> > > > static inline void check_irqs_on(void)
> > > > {
> > > > #ifdef irqs_disabled
> > > >          BUG_ON(irqs_disabled());
> > > > #endif
> > > > }
> > > > "
> > > >
> > > > This is all new to me so I'm still at the head-scratching stage.
> > >
> > > Ah, I see.
> > >
> > > Thank you,
> > >
> > > > David,
> > > > Does the above make sense to you? Have you managed to reproduce the
> > > > crash I get?
> > > >
> > > > Cheers,
> > > > --
> > > > Steve
>
> I have easily produced a crash although it doesn't look to me like the
> same one.  I'm getting a NULL pointer dereference.  The PMU stuff (used
> by perf record|stat -e) should be quite independent of kprobes though.
>
> -dl

Oops, never mind the above bit.  I see this is not PMU-related, but use 
of kprobes through perf.  My bad.

-dl

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