linux-kernel - Re: pipe/page fault oddness.

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Message-ID: <CA+55aFzKgJ41Mp=Ub8Kq_uFDHYzkHo3zhO3MHOJo_O2iExdYmQ@mail.gmail.com>
Date:	Tue, 30 Sep 2014 09:46:45 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: pipe/page fault oddness.

On Tue, Sep 30, 2014 at 9:40 AM, Dave Jones <davej@...hat.com> wrote:
>
> ah, echo 0 > tracing_on isn't enough, I had to 0 out set_ftrace_pid too.
> Never mind.  Subsequent traces all looking the same, minus the tracing
> junk though.

Yeah, looks like that copy_page_to_iter+0x3b3 is always there.

> Is there some way I can figure out what address it's faulting on ?
> I wonder if that might give some clues.

Could be useful. There's a trace_page_fault_kernel() entry that should
give it to you, along with error code.

            Linus
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