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SubjectRe: VM: Found a writable swap-cached page!
Magnus Sjoegren wrote:

> Yes, I see this with both 110 and 111.
> Here is the output of the diagnostic patch made by Stephen C.
> Tweedie (sct@redhat.com).
>
> Jul 27 17:32:31 atlas kernel: page=c0234ac0@00065200, found=c0234ac0,
> count=3
> Jul 27 17:32:31 atlas kernel: VM: Found a writable swap-cached page!
> Jul 27 17:32:31 atlas kernel: pte 871047, vma flags 000000fb, page
> flags 0000028c, count 2
> Jul 27 17:32:31 atlas kernel: page=c023f530@00065800, found=c023f530,
> count=3

Hmm, very interesting. This time the pte present bit is set, so the page is
really there. The pte flags say dirty/user/rw/present, and the vma flags say
shared/write/read. Looks like it really shouldn't be swap-cached.

So the writable swap-cache problem appears to be back in a different form. Can
you reproduce this easily? We need to figure out what sequence of events leads
up to this ...

Regards,
Bill



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