Messages in this thread | | | Date | Mon, 9 Jan 2006 08:32:20 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: vm related lock up in 2.6.15 |
| |
On Mon, 9 Jan 2006, Dave Jones wrote: > > Linus, > 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.
Linus - 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/
| |