Messages in this thread | | | Date | Fri, 26 Dec 2008 10:48:57 +0100 | From | Ingo Molnar <> | Subject | Re: DEBUG_PAGEALLOC + order-10 alloc/free_pages = lockup |
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* Tony Battersby <tonyb@cybernetics.com> wrote:
> An order-10 alloc_pages followed by free_pages with DEBUG_PAGEALLOC > causes a lockup during subsequent memory allocations. Order-9 and lower > do not trigger the problem. This problem was introduced in 2.6.25-rc1 > and fixed in 2.6.28-rc1. Even though the bug is now fixed, I am > reporting it because: > > 1) I am not sure that anyone ever realized that the bug existed.
Correct.
> 2) I want to make sure that the bug is really fixed and not just hidden > from view.
i think it got hidden. Apparently splitting up a large kernel linear page in IRQ context has a bug. I dont see it immediately what it could be - Thomas, Suresh, do you have any ideas?
> 3) To see if anyone thinks that the fix should be included in > 2.6.27 -stable.
if 0b8fdcbcd287a1fbe66817491e6149841ae25705 applies cleanly to .27 -stable then i'd agree it should be added. If there's lots of dependencies then maybe not.
Ingo
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