Messages in this thread | | | Subject | Re: [PATCH] mm: fix page_mkclean_one | From | Mike Galbraith <> | Date | Thu, 28 Dec 2006 23:35:10 +0100 |
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On Thu, 2006-12-28 at 11:45 -0800, Andrew Morton wrote: > On Thu, 28 Dec 2006 11:28:52 -0800 (PST) > Linus Torvalds <torvalds@osdl.org> wrote: > > > > > > > On Thu, 28 Dec 2006, Guillaume Chazarain wrote: > > > > > > The attached patch fixes the corruption for me. > > > > Well, that's a good hint, but it's really just a symptom. You effectively > > just made the test-program not even try to flush the data to disk, so the > > page cache would stay in memory, and you'd not see the corruption as well. > > > > So you basically disabled the code that tried to trigger the bug more > > easily. > > > > But the reason I say it's interesting is that "WB_SYNC_NONE" is very much > > implicated in mm/page-writeback.c, and if there is a bug triggered by > > WB_SYNC_NONE writebacks, then that would explain why page-writeback.c also > > fails.. > > > > It would be interesting to convert your app to do fsync() before > FADV_DONTNEED. That would take WB_SYNC_NONE out of the picture as well > (apart from pdflush activity).
I did fdatasync(), tried remapping before unmapping... nogo here.
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