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From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Vlastimil Babka <vbabka@suse.cz>,
	dri-devel@lists.freedesktop.org, Hugh Dickins <hughd@google.com>,
	John Einar Reitan <john.reitan@foss.arm.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Konstantin Khlebnikov <koct9i@gmail.com>,
	Mel Gorman <mgorman@suse.de>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
	Rafael Aquini <aquini@redhat.com>, Rik van Riel <riel@redhat.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	virtualization@lists.linux-foundation.org,
	Gioh Kim <gi-oh.kim@profitbricks.com>,
	Chan Gyun Jeong <chan.jeong@lge.com>,
	Sangseok Lee <sangseok.lee@lge.com>,
	Kyeongdon Kim <kyeongdon.kim@lge.com>,
	Chulmin Kim <cmlaika.kim@samsung.com>
Subject: Re: [PATCH v7 00/12] Support non-lru page migration
Date: Thu, 16 Jun 2016 17:42:11 +0900
Message-ID: <20160616084211.GA432@swordfish> (raw)
In-Reply-To: <20160616064753.GR17127@bbox>

On (06/16/16 15:47), Minchan Kim wrote:
> > [..]
> > > > this is what I'm getting with the [zsmalloc: keep first object offset in struct page]
> > > > applied:  "count:0 mapcount:-127". which may be not related to zsmalloc at this point.
> > > > 
> > > > kernel: BUG: Bad page state in process khugepaged  pfn:101db8
> > > > kernel: page:ffffea0004076e00 count:0 mapcount:-127 mapping:          (null) index:0x1
> > > 
> > > Hm, it seems double free.
> > > 
> > > It doen't happen if you disable zram? IOW, it seems to be related
> > > zsmalloc migration?
> > 
> > need to test more, can't confidently answer now.
> > 
> > > How easy can you reprodcue it? Could you bisect it?
> > 
> > it takes some (um.. random) time to trigger the bug.
> > I'll try to come up with more details.
> 
> Could you revert [1] and retest?
> 
> [1] mm/compaction: split freepages without holding the zone lock

ok, so this is not related to zsmalloc. finally manged to reproduce
it. will fork a separate thread.

	-ss

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  reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-31 23:21 Minchan Kim
2016-05-31 23:21 ` [PATCH v7 01/12] mm: use put_page to free page instead of putback_lru_page Minchan Kim
2016-05-31 23:21 ` [PATCH v7 02/12] mm: migrate: support non-lru movable page migration Minchan Kim
2016-05-31 23:21 ` [PATCH v7 03/12] mm: balloon: use general non-lru movable page feature Minchan Kim
2016-05-31 23:21 ` [PATCH v7 04/12] zsmalloc: keep max_object in size_class Minchan Kim
2016-05-31 23:21 ` [PATCH v7 05/12] zsmalloc: use bit_spin_lock Minchan Kim
2016-05-31 23:21 ` [PATCH v7 06/12] zsmalloc: use accessor Minchan Kim
2016-05-31 23:21 ` [PATCH v7 07/12] zsmalloc: factor page chain functionality out Minchan Kim
2016-05-31 23:21 ` [PATCH v7 08/12] zsmalloc: introduce zspage structure Minchan Kim
2016-05-31 23:21 ` [PATCH v7 09/12] zsmalloc: separate free_zspage from putback_zspage Minchan Kim
2016-05-31 23:21 ` [PATCH v7 10/12] zsmalloc: use freeobj for index Minchan Kim
2016-05-31 23:21 ` [PATCH v7 11/12] zsmalloc: page migration support Minchan Kim
2016-06-01 14:09   ` Vlastimil Babka
2016-06-02  0:25     ` Minchan Kim
2016-06-02 11:44       ` Vlastimil Babka
2016-06-01 21:39   ` Andrew Morton
2016-06-02  0:15     ` Minchan Kim
     [not found]   ` <CGME20170119001317epcas1p188357c77e1f4ff08b6d3dcb76dedca06@epcas1p1.samsung.com>
2017-01-19  0:13     ` Chulmin Kim
2017-01-19  2:44       ` Minchan Kim
2017-01-19  3:39         ` Chulmin Kim
2017-01-19  6:21           ` Minchan Kim
2017-01-19  8:16             ` Chulmin Kim
2017-01-23  5:22               ` Minchan Kim
2017-01-23  5:30                 ` Sergey Senozhatsky
2017-01-23  5:40                   ` Minchan Kim
2017-01-25  4:06                     ` Chulmin Kim
2017-01-25  4:25                       ` Sergey Senozhatsky
2017-01-25  5:26                       ` Minchan Kim
2017-01-26 17:04                         ` Dan Streetman
2017-01-31  0:10                           ` Minchan Kim
2017-01-31 13:09                             ` Dan Streetman
2017-02-01  6:51                               ` Minchan Kim
2017-02-01 19:38                                 ` Dan Streetman
2017-02-02  8:48                               ` Minchan Kim
2016-05-31 23:21 ` [PATCH v7 12/12] zram: use __GFP_MOVABLE for memory allocation Minchan Kim
2016-06-01 21:41 ` [PATCH v7 00/12] Support non-lru page migration Andrew Morton
2016-06-01 22:40   ` Daniel Vetter
2016-06-02  0:36   ` Minchan Kim
2016-06-15  7:59 ` Sergey Senozhatsky
2016-06-15 23:12   ` Minchan Kim
2016-06-16  2:48     ` Sergey Senozhatsky
2016-06-16  2:58       ` Minchan Kim
2016-06-16  4:23         ` Sergey Senozhatsky
2016-06-16  4:47           ` Minchan Kim
2016-06-16  5:22             ` Sergey Senozhatsky
2016-06-16  6:47               ` Minchan Kim
2016-06-16  8:42                 ` Sergey Senozhatsky [this message]
2016-06-16 10:09                   ` Minchan Kim
2016-06-17  7:28                     ` Joonsoo Kim

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