Messages in this thread | | | Date | Mon, 9 Jan 2006 11:35:07 -0500 | From | Dave Jones <> | Subject | Re: vm related lock up in 2.6.15 |
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On Mon, Jan 09, 2006 at 08:32:20AM -0800, Linus Torvalds wrote:
> > Turns out this was your BUG_ON(page_count(p) <= page_mapcount(p)); > > addition to putpage_test_zero, which I added a few days ago and promptly > > forgot about. > > > > Triggering this isn't too difficult it seems :-/ > > Well, as I warned in the message that had the patch, the test _is_ racy. > The reads of the page counts have no serialization, so if another process > is changing them, I don't guarantee that the test is correct. > > IOW, it was meant as a special case debug test for one particular problem > where I hoped it would give more information, rather than a real patch.
ok, that explains. I'll go back to chasing the real cause of the corruption I was seeing :-/
Dave
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