Re: [PATCH] mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode

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On Thu, Mar 15, 2012 at 03:44:31PM +0100, Andrea Arcangeli wrote:

 > At some point prior to the panic, a "bad pmd ..." message similar to the
 > following is logged on the console:
 > 
 >   mm/memory.c:145: bad pmd ffff8800376e1f98(80000000314000e7).

Hmm, I wonder if this could explain some of the many bad page state bug
reports we've seen in Fedora recently.  (See my recent mail to linux-mm)

 > Reported-by: Ulrich Obergfell <uobergfe@xxxxxxxxxx>
 > Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>

Should probably go to stable too ? How far back does this bug go ?

	Dave

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