* strange bug rmap15a
@ 2002-12-12 2:39 Rik van Riel
2002-12-12 2:59 ` Rik van Riel
0 siblings, 1 reply; 2+ messages in thread
From: Rik van Riel @ 2002-12-12 2:39 UTC (permalink / raw)
To: Arjan van de Ven; +Cc: linux-mm
OK, something between rmap15 and rmap15a is triggering the
following bug, where launder_page() really doesn't know
what to do with a page that:
1) has a page->count of 1
2) does not have mapping, buffers, or pte_chain set
3) is clean
mystery page c1028220, cnt 1 map 00000000, buf 00000000, ptec 00000000, dirty 0
I don't know how the pages end up in this situation, but it's
not a pretty sight and effectively kills the machine...
Rik
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: strange bug rmap15a
2002-12-12 2:39 strange bug rmap15a Rik van Riel
@ 2002-12-12 2:59 ` Rik van Riel
0 siblings, 0 replies; 2+ messages in thread
From: Rik van Riel @ 2002-12-12 2:59 UTC (permalink / raw)
To: Arjan van de Ven; +Cc: linux-mm, Benjamin LaHaise
On Thu, 12 Dec 2002, Rik van Riel wrote:
> OK, something between rmap15 and rmap15a is triggering the
Forget that, it's Ben's pte-highmem patch ...
> mystery page c1028220, cnt 1 map 00000000, buf 00000000, ptec 00000000, dirty 0
... it conveniently adds a page->pte.{direct,chain} union, but
doesn't remove the old page->pte_chain field, which is still
referenced by tons of source code.
Of course the old field is always zero, so left and right code
gets confused...
regards,
Rik
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