On Wed, 29 Jan 2003, Ben Marzinski wrote:

> There is a reproducible memory mapping problem with the s390 SuSE linux
> setup we have.  The bug occurs when two processes have private, read-only
> mappings of the same file and both processes page in the same page at
> the same time. The PTE for that page gets incorrectly marked dirty, which
> causes the page to be marked dirty, and the writepage() address space
> operation to be called. Nothing that the processes have done should have
> caused the page to be written back to the file. The file is modified even
> if the whole filesystem is mounted Read-Only.

Try using chattr +i to make the file immutable.



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