On 09/13/2012 02:27 PM, Hugh Dickins wrote: > On Wed, 12 Sep 2012, Xiao Guangrong wrote: >> On 09/12/2012 10:03 AM, Hugh Dickins wrote: >> >>> What brought me to look at it was hitting "BUG at mm/huge_memory.c:1842!" >>> running tmpfs kbuild swapping load (with memcg's memory.limit_in_bytes >>> forcing out to swap), while I happened to have CONFIG_NUMA=y. >>> >>> That's the VM_BUG_ON(*hpage) on entry to khugepaged_alloc_page(). >> >>> >>> So maybe 9/12 is just obscuring what was already a BUG, either earlier >>> in your series or elsewhere in mmotm (I've never seen it on 3.6-rc or >>> earlier releases, nor without CONFIG_NUMA). I've not spent any time >>> looking for it, maybe it's obvious - can you spot and fix it? >> >> Hugh, >> >> I think i have already found the reason, > > Great, thank you. > >> if i am correct, the bug was existing before my patch. > > Before your patchset? Are you sure of that? No. :) I have told Andrew that the fix patch need not back port in 0/3. Sorry again for my mistake. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>