Re: mm: kernel BUG at include/linux/swapops.h:131!

From: Sasha Levin
Date: Tue Dec 24 2013 - 14:28:39 EST

On 12/24/2013 01:07 AM, Joonsoo Kim wrote:
On Mon, Dec 23, 2013 at 10:01:10PM -0500, Sasha Levin wrote:
On 12/23/2013 09:51 PM, Joonsoo Kim wrote:
On Mon, Dec 23, 2013 at 12:24:02PM -0500, Sasha Levin wrote:

I've also Cc'ed the "this page shouldn't be locked at all" team.

I can't find the reason of this problem.
If it is reproducible, how about bisecting?

While it reproduces under fuzzing it's pretty hard to bisect it with
the amount of issues uncovered by trinity recently.

I can add any debug code to the site of the BUG if that helps.

It will be helpful to add dump_page() in migration_entry_to_page().

[ 3800.520039] page:ffffea0000245800 count:12 mapcount:4 mapping:ffff88001d0c3668 index:0x7de
[ 3800.521404] page flags: 0x1fffff8038003c(referenced|uptodate|dirty|lru|swapbacked|unevictable|mlocked)
[ 3800.522585] pc:ffff88001ed91600 pc->flags:2 pc->mem_cgroup:ffffc90000c0a000

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at