Messages in this thread |  | | | Date | Sun, 15 Oct 2006 10:03:51 +0200 | | From | Nick Piggin <> | | Subject | Re: [PATCH] get_user_pages(..., write==1, ...) may return with readable pte. |
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On Sat, Oct 14, 2006 at 05:15:07AM -0500, Robin Holt wrote: > > dup_mmap holds mmap_sem for write. get_user_pages caller must hold it > > for read. > > I could have sworn I checked for that and found a down_read(), but > now that I look when I have some time, it is clearly a down_write(). > Sorry for the distraction.
I'm one to do the same thing, don't worry ;)
> It is a user job that is passing data between hosts. The host is > under heavy memory pressure and one rank of the MPI job gets silent > data corruption.
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=016eb4a0ed06a3677d67a584da901f0e9a63c666
It could be this? inode reclaim calls invalidate_inode_pages, so this one is a memory corrupter under heavy reclaim pressure.
> > Thanks and sorry for wasting your time,
Not at all, my pleasure. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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