Re: pipe/page fault oddness.
From: Dave Jones
Date: Tue Sep 30 2014 - 14:21:17 EST
On Tue, Sep 30, 2014 at 09:46:45AM -0700, Linus Torvalds wrote:
> On Tue, Sep 30, 2014 at 9:40 AM, Dave Jones <davej@xxxxxxxxxx> 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.
page_fault_kernel: address=__per_cpu_end ip=copy_page_to_iter error_code=0x2
over and over..
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