Messages in this thread | | | Date | Thu, 04 Jan 2007 14:57:24 +1100 | From | Nick Piggin <> | Subject | Re: VM: Fix nasty and subtle race in shared mmap'ed page writeback |
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Andrea Gelmini wrote: > On Sun, Dec 31, 2006 at 02:55:58PM +1100, Nick Piggin wrote: > >>This bug was only introduced in 2.6.19, due to a change that caused pte > > no, Linus said that with 2.6.19 it's easier to trigger this bug...
Yhat's when the bug was introduced -- 2.6.19. 2.6.18 does not have this bug, so it cannot be years old.
>>So if your corruption is years old, then it must be something else. >>Maybe it is hidden by a timing change, or BDB isn't using msync properly. > > I can give you a complete image where just changing kernel (everything > is same, of course) corruptions goes away. > we spent a lot, I mean a *lot*, of time looking for our code mistake, > and so on. > I don't want to seem rude, but I am sure that Berkeley DB corruption we > have seen (not just Klibido, but I also think about postgrey, and so on) > depends on this bug. > I repeat, if you have time/interest I can give you a complete machine > to see the problem.
You're not being rude, but I just wanted to point out that this patch (nor the dirty page accounting also in 2.6.19) doesn't fix anything that was in 2.6.18, AFAIKS.
I wouldn't discount a kernel bug, but it will be hard to track down unless you can find an earlier kernel that did not cause the corruptions and/or provide source for a minimal test case to reproduce.
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