FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-writeback-switch-20150522
commit 5025fe55d485e2f08e99dce41e107c5b724ddf9c ("writeback: implement foreign cgroup inode detection")


+--------------------------------------------------------+------------+------------+
|                                                        | 87462a21cf | 5025fe55d4 |
+--------------------------------------------------------+------------+------------+
| WARNING:at_mm/memcontrol.c:#mem_cgroup_css_from_page() | 0          | 10         |
| backtrace:__filemap_fdatawrite_range                   | 0          | 10         |
| backtrace:SyS_fadvise64                                | 0          | 10         |
+--------------------------------------------------------+------------+------------+


Performing full device TRIM (256.00GiB) ...
[   14.139656] ------------[ cut here ]------------
[   14.140131] ------------[ cut here ]------------
[   14.140139] WARNING: CPU: 0 PID: 440 at mm/memcontrol.c:627 mem_cgroup_css_from_page+0x4e/0x60()
[   14.140163] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sr_mod cdrom ata_generic pata_acpi crct10dif_pclmul cirrus crc32_pclmul sg sd_mod syscopyarea crc32c_intel ppdev sysfillrect sysimgblt ghash_clmulni_intel ttm drm_kms_helper snd_pcm aesni_intel lrw gf128mul glue_helper ablk_helper cryptd snd_timer ata_piix microcode snd libata soundcore pcspkr serio_raw drm virtio_scsi i2c_piix4 floppy parport_pc parport acpi_cpufreq
[   14.140166] CPU: 0 PID: 440 Comm: mkfs.btrfs Not tainted 4.1.0-rc2-00107-gb84886e #22
[   14.140167] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[   14.140170]  ffffffff81b9c2f8 ffff88003e487b58 ffffffff818c4a97 000000004c304c30
[   14.140172]  0000000000000000 ffff88003e487b98 ffffffff8107666a 0000000000000010
[   14.140174]  ffff88003e487e78 0000000000001000 0000000000000001 0000000000000000
[   14.140175] Call Trace:
[   14.140180]  [<ffffffff818c4a97>] dump_stack+0x4c/0x65
[   14.140184]  [<ffffffff8107666a>] warn_slowpath_common+0x8a/0xc0
[   14.140186]  [<ffffffff8107675a>] warn_slowpath_null+0x1a/0x20
[   14.140188]  [<ffffffff811e07de>] mem_cgroup_css_from_page+0x4e/0x60
[   14.140191]  [<ffffffff8121f301>] wbc_account_io+0x21/0x90
[   14.140193]  [<ffffffff81228027>] submit_bh_wbc+0xa7/0x1a0
[   14.140195]  [<ffffffff8122a2dc>] __block_write_full_page+0x13c/0x440
[   14.140197]  [<ffffffff8122a8d0>] ? I_BDEV+0x10/0x10
[   14.140199]  [<ffffffff8122a6e5>] block_write_full_page+0x105/0x120
[   14.140201]  [<ffffffff8122b128>] blkdev_writepage+0x18/0x20
[   14.140205]  [<ffffffff8117d067>] __writepage+0x17/0x40
[   14.140207]  [<ffffffff8117f6d4>] write_cache_pages+0x234/0x4f0
[   14.140209]  [<ffffffff8117d050>] ? wb_position_ratio+0x1f0/0x1f0
[   14.140211]  [<ffffffff8117f9d0>] generic_writepages+0x40/0x60
[   14.140213]  [<ffffffff8118062e>] do_writepages+0x1e/0x30
[   14.140215]  [<ffffffff811735f0>] __filemap_fdatawrite_range+0xb0/0x100
[   14.140218]  [<ffffffff811b5be1>] SyS_fadvise64+0x101/0x2a0
[   14.140220]  [<ffffffff818ccf2e>] system_call_fastpath+0x12/0x71
[   14.140221] ---[ end trace 8d225dd114f35299 ]---
[   14.173526] WARNING: CPU: 1 PID: 442 at mm/memcontrol.c:627 mem_cgroup_css_from_page+0x4e/0x60()



Thanks,
Ying Huang
-------------------------------------
lkp@eclists.intel.com
https://eclists.intel.com/sympa/info/lkp
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