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From: Minchan Kim <minchan@kernel.org>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: 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 13:47:10 +0900
Message-ID: <20160616044710.GP17127@bbox> (raw)
In-Reply-To: <20160616042343.GA516@swordfish>

On Thu, Jun 16, 2016 at 01:23:43PM +0900, Sergey Senozhatsky wrote:
> On (06/16/16 11:58), Minchan Kim wrote:
> [..]
> > RAX: 2065676162726166 so rax is totally garbage, I think.
> > It means obj_to_head returns garbage because get_first_obj_offset is
> > utter crab because (page_idx / class->pages_per_zspage) was totally
> > wrong.
> > 
> > > 					^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > >     6408:       f0 0f ba 28 00          lock btsl $0x0,(%rax)
> >  
> > <snip>
> > 
> > > > Could you test with [zsmalloc: keep first object offset in struct page]
> > > > in mmotm?
> > > 
> > > sure, I can.  will it help, tho? we have a race condition here I think.
> > 
> > I guess root cause is caused by get_first_obj_offset.
> 
> sounds reasonable.
> 
> > Please test with it.
> 
> 
> 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?

How easy can you reprodcue it? Could you bisect it?

> kernel: flags: 0x8000000000000000()
> kernel: page dumped because: nonzero mapcount
> kernel: Modules linked in: lzo zram zsmalloc mousedev coretemp hwmon crc32c_intel snd_hda_codec_realtek i2c_i801 snd_hda_codec_generic r8169 mii snd_hda_intel snd_hda_codec snd_hda_core acpi_cpufreq snd_pcm snd_timer snd soundcore lpc_ich processor mfd_core sch_fq_codel sd_mod hid_generic usb
> kernel: CPU: 3 PID: 38 Comm: khugepaged Not tainted 4.7.0-rc3-next-20160615-dbg-00005-gfd11984-dirty #491
> kernel:  0000000000000000 ffff8801124c73f8 ffffffff814d69b0 ffffea0004076e00
> kernel:  ffffffff81e658a0 ffff8801124c7420 ffffffff811e9b63 0000000000000000
> kernel:  ffffea0004076e00 ffffffff81e658a0 ffff8801124c7440 ffffffff811e9ca9
> kernel: Call Trace:
> kernel:  [<ffffffff814d69b0>] dump_stack+0x68/0x92
> kernel:  [<ffffffff811e9b63>] bad_page+0x158/0x1a2
> kernel:  [<ffffffff811e9ca9>] free_pages_check_bad+0xfc/0x101
> kernel:  [<ffffffff811ee516>] free_hot_cold_page+0x135/0x5de
> kernel:  [<ffffffff811eea26>] __free_pages+0x67/0x72
> kernel:  [<ffffffff81227c63>] release_freepages+0x13a/0x191
> kernel:  [<ffffffff8122b3c2>] compact_zone+0x845/0x1155
> kernel:  [<ffffffff8122ab7d>] ? compaction_suitable+0x76/0x76
> kernel:  [<ffffffff8122bdb2>] compact_zone_order+0xe0/0x167
> kernel:  [<ffffffff8122bcd2>] ? compact_zone+0x1155/0x1155
> kernel:  [<ffffffff8122ce88>] try_to_compact_pages+0x2f1/0x648
> kernel:  [<ffffffff8122ce88>] ? try_to_compact_pages+0x2f1/0x648
> kernel:  [<ffffffff8122cb97>] ? compaction_zonelist_suitable+0x3a6/0x3a6
> kernel:  [<ffffffff811ef1ea>] ? get_page_from_freelist+0x2c0/0x133c
> kernel:  [<ffffffff811f0350>] __alloc_pages_direct_compact+0xea/0x30d
> kernel:  [<ffffffff811f0266>] ? get_page_from_freelist+0x133c/0x133c
> kernel:  [<ffffffff811ee3b2>] ? drain_all_pages+0x1d6/0x205
> kernel:  [<ffffffff811f21a8>] __alloc_pages_nodemask+0x143d/0x16b6
> kernel:  [<ffffffff8111f405>] ? debug_show_all_locks+0x226/0x226
> kernel:  [<ffffffff811f0d6b>] ? warn_alloc_failed+0x24c/0x24c
> kernel:  [<ffffffff81110ffc>] ? finish_wait+0x1a4/0x1b0
> kernel:  [<ffffffff81122faf>] ? lock_acquire+0xec/0x147
> kernel:  [<ffffffff81d32ed0>] ? _raw_spin_unlock_irqrestore+0x3b/0x5c
> kernel:  [<ffffffff81d32edc>] ? _raw_spin_unlock_irqrestore+0x47/0x5c
> kernel:  [<ffffffff81110ffc>] ? finish_wait+0x1a4/0x1b0
> kernel:  [<ffffffff8128f73a>] khugepaged+0x1d4/0x484f
> kernel:  [<ffffffff8128f566>] ? hugepage_vma_revalidate+0xef/0xef
> kernel:  [<ffffffff810d5bcc>] ? finish_task_switch+0x3de/0x484
> kernel:  [<ffffffff81d32f18>] ? _raw_spin_unlock_irq+0x27/0x45
> kernel:  [<ffffffff8111d13f>] ? trace_hardirqs_on_caller+0x3d2/0x492
> kernel:  [<ffffffff81111487>] ? prepare_to_wait_event+0x3f7/0x3f7
> kernel:  [<ffffffff81d28bf5>] ? __schedule+0xa4d/0xd16
> kernel:  [<ffffffff810cd0de>] kthread+0x252/0x261
> kernel:  [<ffffffff8128f566>] ? hugepage_vma_revalidate+0xef/0xef
> kernel:  [<ffffffff810cce8c>] ? kthread_create_on_node+0x377/0x377
> kernel:  [<ffffffff81d3387f>] ret_from_fork+0x1f/0x40
> kernel:  [<ffffffff810cce8c>] ? kthread_create_on_node+0x377/0x377
> -- Reboot --
> 
> 	-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 [this message]
2016-06-16  5:22             ` Sergey Senozhatsky
2016-06-16  6:47               ` Minchan Kim
2016-06-16  8:42                 ` Sergey Senozhatsky
2016-06-16 10:09                   ` Minchan Kim
2016-06-17  7:28                     ` Joonsoo Kim

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