Re: 2.6.13.4 After increasing RAM, I'm getting Bad page state at prep_new_page

[Steve Youngs]

* Hugh Dickins <hugh@xxxxxxxxxxx> writes:

  > On Thu, 20 Oct 2005, Steve Youngs wrote:
  >> 
  >> A few days ago I increased my RAM from 0.5Gb to 3Gb and since then
  >> I've been getting `Bad page state at prep_new_page' errors at odd
  >> times.  Here is a typical backtrace from my logs:
  >> 
  >> Bad page state at prep_new_page (in process 'X', page c1f7bde0)
  >> flags:0x80000004 mapping:00000000 mapcount:-262144 count:0

  > The bad memory in question (the struct page at 0xc1f7bde0) is quite
  > low down, just below 32MB.  Would I be right to guess that that you
  > inserted the new cards in such a way that the low memory is new RAM?

No.  All the memory is new RAM.  I originally had 2x256MB, and I
replaced those with 3x1GB.  Sorry if the Subject header was a bit
misleading. 

  > I suggest you try taking out that lowest card, and see what happens
  > then.  Sometimes the kernel these days seems to find memory problems
  > that memtest86 does not (how long did you run it? overnight?).

When I had posted the message I had only let it run through all tests
once.  I have since let it run for about 18 hours, where it came up
with a single error (as reported in my reply to Ken).

  > You could try sending me all your "Bad page state" messages,
  > to check for correlations.

OK, I'll send those to you off-list.

Thanks very much, Hugh.

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