On 03/04/2014 06:49 PM, Naoya Horiguchi wrote: > On Tue, Mar 04, 2014 at 05:46:52PM -0500, Sasha Levin wrote: >> On 03/04/2014 04:32 PM, Naoya Horiguchi wrote: >>> # sorry if duplicate message >>> >>> On Mon, Mar 03, 2014 at 04:38:41PM -0500, Sasha Levin wrote: >>>> On 03/03/2014 03:06 PM, Sasha Levin wrote: >>>>> On 03/03/2014 12:02 AM, Naoya Horiguchi wrote: >>>>>> Hi Sasha, >>>>>> >>>>>>>> I can confirm that with this patch the lockdep issue is gone. However, the NULL deref in >>>>>>>> walk_pte_range() and the BUG at mm/hugemem.c:3580 still appear. >>>>>> I spotted the cause of this problem. >>>>>> Could you try testing if this patch fixes it? >>>>> >>>>> I'm seeing a different failure with this patch: >>>> >>>> And the NULL deref still happens. >>> >>> I don't yet find out the root reason why this issue remains. >>> So I tried to run trinity myself but the problem didn't reproduce. >>> (I did simply like "./trinity --group vm --dangerous" a few hours.) >>> Could you show more detail or tips about how the problem occurs? >> >> I run it as root in a disposable vm, that may be the difference here. > > Sorry, I didn't write it but I also run it as root on VM, so condition is > the same. It might depend on kernel config, so I'm now trying the config > you previously gave me, but it doesn't boot correctly on my environment > (panic in initialization). I may need some time to get over this. I'd be happy to help with anything off-list, it shouldn't be too difficult to get that kernel to boot :) I've also reverted the page walker series for now, it makes it impossible to test anything else since it seems that hitting one of the issues is quite easy. Thanks, Sasha -- 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>