Messages in this thread | | | Date | Thu, 11 Nov 2010 11:34:15 +0100 | From | Andi Kleen <> | Subject | Re: [PATCHv2 1/2] tracing - fix recursive user stack trace |
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On Thu, Nov 11, 2010 at 10:09:08AM +0100, Jiri Olsa wrote: > The user stack trace can fault when examining the trace. Which > would call the do_page_fault handler, which would trace again, > which would do the user stack trace, which would fault and call > do_page_fault again ... > > Thus this is causing a recursive bug. We need to have a recursion > detector here.
I suspect this problem is in more trace points: any NMI or MCE trace point or any other trace point that can be triggered from a page. so it seems to be a general bug fix independent of the other patch.
-Andi
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