Messages in this thread | | | Date | Tue, 30 Sep 2014 14:20:59 -0400 | From | Dave Jones <> | Subject | Re: pipe/page fault oddness. |
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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@redhat.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.
Hm.
page_fault_kernel: address=__per_cpu_end ip=copy_page_to_iter error_code=0x2
over and over..
Dave
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