nilfs_clean_segments: segment construction failed. (err=-2)

Hi!

I'm using nilfs on thumb drives to sync Bitcoin wallets and it's forks.

Sometimes, when I quit the bitcoin-qt application, this is what happens (in dmesg)

[159141.505498] nilfs_btree_propagate: key = 10, level == 0
[159141.715622] nilfs_btree_propagate: key = 10, level == 0
[159141.716134] NILFS warning (device dm-0): nilfs_clean_segments: segment construction failed. (err=-2)
[159146.715145] nilfs_btree_propagate: key = 10, level == 0
[159146.715152] NILFS warning (device dm-0): nilfs_clean_segments: segment construction failed. (err=-2)
[159151.715018] nilfs_btree_propagate: key = 10, level == 0
[159151.715026] NILFS warning (device dm-0): nilfs_clean_segments: segment construction failed. (err=-2)
[159156.714892] nilfs_btree_propagate: key = 10, level == 0
...
...
...
[160276.691089] nilfs_btree_propagate: key = 10, level == 0
[160276.691096] NILFS warning (device dm-0): nilfs_clean_segments: segment construction failed. (err=-2)
[160281.690959] nilfs_btree_propagate: key = 10, level == 0
[160281.690967] NILFS warning (device dm-0): nilfs_clean_segments: segment construction failed. (err=-2)

I can still access the thumbdrive and it's contents. In the mean time many processes remain at D state and I have to force restart.

The devices used are perfectly fine. I've 3 of them, 2 of them are used as a single LVM volume and another one uses the whole device as a nilfs FS (no partition table). --
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What kernel version do you use?
What garbage collection policy do you use? Could you share superblock content (nilfs-tune -l)?

So, could you describe clear way of the issue reproducing on my side?

Thanks,
Vyacheslav Dubeyko.

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I'm using 3.14.4. I thought there was only 1 selection policy, so it's set to timestamp.

nilfs-tune -l /dev/bitcoin/bitcoin
nilfs-tune 2.1.6

Filesystem volume name:   test
Filesystem UUID:          9e1064e0-4ce8-4831-93c0-758b46118884
Filesystem magic number:  0x3434
Filesystem revision #:    2.0
Filesystem features:      (none)
Filesystem state:         invalid or mounted
Filesystem OS type:       Linux
Block size:               1024
Filesystem created:       Sun Jun 22 15:31:18 2014
Last mount time:          Thu Jun 26 11:26:50 2014
Last write time:          Thu Jun 26 11:27:23 2014
Mount count:              5
Maximum mount count:      50
Reserve blocks uid:       0 (user root)
Reserve blocks gid:       0 (group root)
First inode:              11
Inode size:               128
DAT entry size:           32
Checkpoint size:          192
Segment usage size:       16
Number of segments:       11375
Device size:              23857201152
First data block:         4
# of blocks per segment:  2048
Reserved segments %:      1
Last checkpoint #:        208680
Last block address:       13015040
Last sequence #:          525413
Free blocks count:        3723264
Commit interval:          0
# of blks to create seg:  0
CRC seed:                 0x1b525ab2
CRC check sum:            0xcede51d1
CRC check data size:      0x00000118

I suspect this has to do with the segment size. So I've re-formatted a device with the default segment size. Let's see if I can reproduce it now. --
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On Thu, 2014-06-26 at 11:30 +0530, dE wrote:

[snip]

It was added 2 additional GC policies. But code for these policies is available in 3.15 kernel version, as I see.

Such block size can be a environment of the issue reproducing. I've fixed one issue for 1KB block size, namely. What do you have for 4 KB block size? Can you reproduce the issue for 4 KB block size?

So, it's freshly created file system. Am I correct? I hoped to see the superblock state for the file system with issue. Or, maybe, you've found the issue soon after file system creation?

So, anyway, I need to understand how to reproduce the issue. As far as I can see, you have the issue on segctor side during segment construction. Frankly speaking, it's really bad situation. It means that you don't save your information into segments. Moreover, it takes place during GC operations. Operation of trying to create segment is repeated till success. So, maybe, finally you have success. Otherwise, if you have sequence of likewise messages ("nilfs_clean_segments: segment construction failed") and you need to force shutdown then, potentially, it means that you have dangerous situation.

But, it needs to understand your issue more deeply for any final statements.

With the best regards,
Vyacheslav Dubeyko.

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I can confirm that at 4K block size, this issue never existed. It started happening when I reduced the block size to improve write and read seek performance when very small amounts of data was being read/written.

Yes, the FS was made at the specified day, but it was running continuously since then.

This problem triggers after running the programs for long amounts of time. Like 1 day+ with GC running the background at low priority (idle i/o). nilfs_cleanerd.conf --

clean_check_interval    300
nsegments_per_clean     1
mc_nsegments_per_clean  1
cleaning_interval      0
mc_cleaning_interval   0
protection_period       0
min_clean_segments      100%
max_clean_segments      100%
selection_policy        timestamp       # timestamp in ascend order
retry_interval          300

use_mmap
log_priority warning

As of the nature of the program which's using files on the FS, it reads and writes very small amounts of data from random places on a set of files (which are reasonably large). Then programs themselves are running at either real time class or normal class.

The bug triggers when I exit the program (which are all of similar nature).

I tried to reproduce this issue by doing random write using the 'seeker' tool, but it didn't trigger. So it triggers specifically on existing the program.

You may like to install the Bitcoin qt wallet from your repositories (maybe it's reproducible with bitcoind client also) and after a day or 2 of running with the above nilfs_cleanerd, try exiting the program. You may trigger the bug. --
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I can confirm this bug triggers cause of smaller block size. Increasing segment size did not help. --
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On Fri, 2014-06-27 at 10:14 +0530, dE wrote:

[snip]

Great. Thank you. I'll try to reproduce the issue.

One more question. Do you use this file system as rootfs or not? I suppose that it's not rootfs file system, as I remember your previous description of the issue.

Thanks,
Vyacheslav Dubeyko.

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No no... it's the data directory of the bitcoin-qt/bitcoind application (~/.bitcoin is a symlink to .bitcoin which is on a nilfs dir).

If you you see, a full bitcoin wallet is a stress test for nilfs cause it results in a HUGE number of garbage blocks.

Initially it's not going to be a challenge, but later on, as Bitcoin became more popular, the no. of Bitcoin transactions dramatically increased, this increase the i/o on the device cause the wallet will verify each transaction as it downloads the blockchain (or old transactions).

Thanks for your corporation.
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Notice this bug will not trigger when running for a few hours. You got to do it for at least 1 day and it'll sure shot work within 2 days. --
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Today I got a new set of errors.

[  127.915603] nilfs_direct_assign: invalid pointer: 0
[  127.915609] NILFS error (device sdc): nilfs_bmap_assign: broken bmap (inode number=202)

[  127.915611] Remounting filesystem read-only
[  127.915616] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348119040, ino 3
[  127.915620] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493821, size 1024
[  127.915622] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493822, size 1024
[  127.915624] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10742381, size 1024
[  127.915626] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5103281, size 1024
[  127.915629] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 202
[  127.915631] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  127.915633] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915635] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915637] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915640] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 6
[  127.915642] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7005068, size 1024
[  127.915644] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7005069, size 1024
[  127.915646] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5147173, size 1024
[  127.915648] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 4708314, size 1024
[  127.915650] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 454
[  127.915652] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6995811, size 1024
[  127.915654] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915656] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915658] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915660] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 5
[  127.915662] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7028502, size 1024
[  127.915664] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 1033179, size 1024
[  127.915666] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 1556797, size 1024
[  127.915668] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 2081912, size 1024
[  127.915670] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 129785856, ino 4
[  127.915672] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915674] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915676] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7028501, size 1024
[  127.915678] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915680] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348123136, ino 3
[  127.915682] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493823, size 1024
[  127.915684] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10742382, size 1024
[  127.915686] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493824, size 1024
[  127.915688] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5185507, size 1024
[  127.915691] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 24576, ino 6
[  127.915693] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915695] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915697] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915698] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7005070, size 1024
[  127.915701] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 12288, ino 5
[  127.915703] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6800054, size 1024
[  127.915705] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7028503, size 1024
[  127.915707] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5485077, size 1024
[  127.915709] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5990958, size 1024
[  127.915712] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 4
[  127.915714] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7028500, size 1024
[  127.915716] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915717] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915719] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  127.915722] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348127232, ino 3
[  127.915724] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815908, size 1024
[  127.915725] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5542116, size 1024
[  127.915727] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5249837, size 1024
[  127.915729] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5274639, size 1024
[  128.045093] ------------[ cut here ]------------
[  128.045105] WARNING: CPU: 1 PID: 7184 at fs/buffer.c:1166 mark_buffer_dirty+0x6c/0x80()
[  128.045107] Modules linked in: nilfs2 fglrx(PO) kvm_intel sr_mod usb_storage cdrom kvm
[  128.045118] CPU: 1 PID: 7184 Comm: fuckcoind Tainted: P O 3.14.8-gentoo #2
[  128.045120] Hardware name: Gigabyte Technology Co., Ltd. H61M-D2H/H61M-D2H, BIOS F5 05/18/2012
[  128.045122]  0000000000000009 ffffffff8155c03c 0000000000000000 ffffffff8103e11d
[  128.045125]  ffff8802267bcf08 ffff8802242e0c60 ffff8801fa483c60 00000000000081b0
[  128.045128]  ffff8802242e9000 ffffffff8111aefc ffff8801fa483c18 ffffffffa0059231
[  128.045131] Call Trace:
[  128.045138]  [<ffffffff8155c03c>] ? dump_stack+0x49/0x6a
[  128.045143]  [<ffffffff8103e11d>] ? warn_slowpath_common+0x6d/0x90
[  128.045147]  [<ffffffff8111aefc>] ? mark_buffer_dirty+0x6c/0x80
[  128.045154]  [<ffffffffa0059231>] ? nilfs_palloc_commit_alloc_entry+0x11/0x60 [nilfs2]
[  128.045159]  [<ffffffffa00586b0>] ? nilfs_ifile_create_inode+0x80/0xf0 [nilfs2]
[  128.045164]  [<ffffffff81108556>] ? alloc_inode+0x26/0x90
[  128.045169]  [<ffffffffa0041474>] ? nilfs_new_inode+0x64/0x200 [nilfs2]
[  128.045175]  [<ffffffffa004fef0>] ? nilfs_near_disk_full+0x10/0x40 [nilfs2]
[  128.045180]  [<ffffffffa0046223>] ? nilfs_create+0x43/0xf0 [nilfs2]
[  128.045184]  [<ffffffff81105419>] ? d_rehash+0x19/0x30
[  128.045187]  [<ffffffff810fdfad>] ? vfs_create+0x5d/0xb0
[  128.045190]  [<ffffffff810fe876>] ? do_last.isra.65+0x876/0xfd0
[  128.045193]  [<ffffffff810ff082>] ? path_openat+0xb2/0x600
[  128.045198]  [<ffffffff810ce903>] ? handle_mm_fault+0x213/0xa10
[  128.045202]  [<ffffffff810ffbd5>] ? do_filp_open+0x35/0x80
[  128.045206]  [<ffffffff8110b5d7>] ? __alloc_fd+0x97/0x120
[  128.045210]  [<ffffffff810f01d4>] ? do_sys_open+0x124/0x210
[  128.045215]  [<ffffffff81562a21>] ? tracesys+0xd4/0xd9
[  128.045217] ---[ end trace d5a322bab678392e ]---
[  132.929759] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 32768, ino 6
[  132.929766] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.929770] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.929773] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6995815, size 1024
[  132.929776] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.929789] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348131328, ino 3
[  132.929792] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5412791, size 1024
[  132.929795] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5321441, size 1024
[  132.929798] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5587311, size 1024
[  132.929801] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815910, size 1024
[  132.929805] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 495
[  132.929807] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929809] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929811] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929813] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929816] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 4096, ino 495
[  132.929818] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929820] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929822] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929824] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929826] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 8192, ino 495
[  132.929828] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929831] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929833] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929835] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929837] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 12288, ino 495
[  132.929839] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929841] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929843] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929845] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929847] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 16384, ino 495
[  132.929849] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929852] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929854] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929856] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929858] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 20480, ino 495
[  132.929860] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929862] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929864] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929866] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929868] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 24576, ino 495
[  132.929870] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929872] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929874] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929876] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929879] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 28672, ino 495
[  132.929881] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929883] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929885] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929887] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929889] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 32768, ino 495
[  132.929891] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929893] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929895] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929897] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929899] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 36864, ino 495
[  132.929901] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929903] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929905] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929908] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929910] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 40960, ino 495
[  132.929912] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929914] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929916] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929918] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929920] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 45056, ino 495
[  132.929923] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929925] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929927] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929929] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929931] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 49152, ino 495
[  132.929933] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929935] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929937] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929939] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929941] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 53248, ino 495
[  132.929943] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929945] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929947] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929949] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929953] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 57344, ino 495
[  132.929954] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929957] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929959] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929961] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929963] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 61440, ino 495
[  132.929965] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929967] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929969] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929971] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929973] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 65536, ino 495
[  132.929975] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929977] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929979] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929982] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929984] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 69632, ino 495
[  132.929986] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929988] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929990] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929992] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929994] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 73728, ino 495
[  132.929996] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.929998] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930000] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930002] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930005] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 77824, ino 495
[  132.930007] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930009] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930011] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930013] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930015] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 81920, ino 495
[  132.930017] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930019] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930021] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930023] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930025] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 86016, ino 495
[  132.930027] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930029] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930031] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930033] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930036] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 90112, ino 495
[  132.930038] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930040] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930042] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930044] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930046] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 94208, ino 495
[  132.930048] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930050] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930052] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930054] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930056] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 98304, ino 495
[  132.930059] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930061] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930063] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930065] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930067] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 102400, ino 495
[  132.930069] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930071] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930073] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930075] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930078] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 106496, ino 495
[  132.930080] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930082] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930084] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930086] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930088] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 110592, ino 495
[  132.930090] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930092] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930094] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930096] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930099] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 114688, ino 495
[  132.930101] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930103] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930105] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930107] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930109] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 118784, ino 495
[  132.930111] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930113] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930115] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930117] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930119] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 122880, ino 495
[  132.930121] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930123] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930125] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930127] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930130] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 126976, ino 495
[  132.930131] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930133] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930135] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930138] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930140] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 131072, ino 495
[  132.930142] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930144] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930146] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930148] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930150] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 135168, ino 495
[  132.930152] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930154] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930156] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930158] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930160] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 139264, ino 495
[  132.930162] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930164] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930166] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930168] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930171] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 143360, ino 495
[  132.930173] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930175] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930177] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930179] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930181] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 147456, ino 495
[  132.930183] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930185] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930187] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930189] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930191] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 151552, ino 495
[  132.930193] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930195] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930197] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930199] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930201] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 155648, ino 495
[  132.930203] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930205] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930207] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930209] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930212] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 159744, ino 495
[  132.930214] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930216] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930218] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930220] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930222] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 163840, ino 495
[  132.930224] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930226] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930228] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930230] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930233] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 167936, ino 495
[  132.930235] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930237] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930239] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930241] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930243] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 172032, ino 495
[  132.930245] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930247] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930249] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930251] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930254] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 176128, ino 495
[  132.930256] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930258] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930260] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930262] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930264] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 180224, ino 495
[  132.930266] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930268] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930270] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930272] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930274] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 184320, ino 495
[  132.930276] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930278] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930280] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930282] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930285] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 188416, ino 495
[  132.930286] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930289] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930291] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930293] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930295] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 192512, ino 495
[  132.930297] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930299] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930301] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930303] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930305] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 196608, ino 495
[  132.930307] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930309] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930311] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930313] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 0, size 1024
[  132.930316] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 679
[  132.930319] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 2147956, size 1024
[  132.930321] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.930323] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.930325] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.930329] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 57344, ino 6
[  132.930331] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.930333] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  132.930335] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6995816, size 1024
[  132.930337] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5795365, size 1024
[  132.930343] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348135424, ino 3
[  132.930345] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5412792, size 1024
[  132.930347] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815911, size 1024
[  132.930349] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5510902, size 1024
[  132.930351] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815912, size 1024
[  137.937681] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 61440, ino 6
[  137.937686] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  137.937689] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  137.937691] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  137.937693] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6995817, size 1024
[  137.937700] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348139520, ino 3
[  137.937703] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493825, size 1024
[  137.937705] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5571642, size 1024
[  137.937707] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5811858, size 1024
[  137.937709] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5674927, size 1024
[  142.945614] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 86016, ino 6
[  142.945619] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  142.945622] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 18446744073709551615, size 1024
[  142.945625] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 2148383, size 1024
[  142.945627] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6995818, size 1024
[  142.945635] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348143616, ino 3
[  142.945638] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5698245, size 1024
[  142.945640] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5698246, size 1024
[  142.945642] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6015801, size 1024
[  142.945644] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5763162, size 1024
[  147.953557] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 0, ino 6
[  147.953561] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7005068, size 1024
[  147.953564] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 7005069, size 1024
[  147.953565] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5147173, size 1024
[  147.953567] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 4708314, size 1024
[  147.953575] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348147712, ino 3
[  147.953577] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493826, size 1024
[  147.953578] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815916, size 1024
[  147.953580] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5828139, size 1024
[  147.953582] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493827, size 1024
[  152.961500] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348151808, ino 3
[  152.961505] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5869625, size 1024
[  152.961508] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6015802, size 1024
[  152.961510] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5901369, size 1024
[  152.961512] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5893217, size 1024
[  157.969410] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348155904, ino 3
[  157.969416] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815918, size 1024
[  157.969419] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493828, size 1024
[  157.969421] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493829, size 1024
[  157.969423] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5958880, size 1024
[  157.969432] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348160000, ino 3
[  157.969434] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493830, size 1024
[  157.969436] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6023894, size 1024
[  157.969438] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815920, size 1024
[  157.969441] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815921, size 1024
[  162.977339] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348164096, ino 3
[  162.977344] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6120506, size 1024
[  162.977346] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815922, size 1024
[  162.977348] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6169644, size 1024
[  162.977350] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493831, size 1024
[  167.985248] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348168192, ino 3
[  167.985252] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6151836, size 1024
[  167.985254] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493832, size 1024
[  167.985256] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6160650, size 1024
[  167.985258] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6239059, size 1024
[  172.993173] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348172288, ino 3
[  172.993178] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493833, size 1024
[  172.993181] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815925, size 1024
[  172.993183] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6280178, size 1024
[  172.993185] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6453546, size 1024
[  178.001115] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348176384, ino 3
[  178.001119] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6483090, size 1024
[  178.001122] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 3591231, size 1024
[  178.001124] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6374290, size 1024
[  178.001126] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815926, size 1024
[  183.009040] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348180480, ino 3
[  183.009045] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6419226, size 1024
[  183.009048] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493834, size 1024
[  183.009050] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6471246, size 1024
[  183.009052] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6617967, size 1024
[  188.016962] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348184576, ino 3
[  188.016966] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6560971, size 1024
[  188.016969] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10815927, size 1024
[  188.016971] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6617968, size 1024
[  188.016973] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6783847, size 1024
[  188.016981] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348188672, ino 3
[  188.016983] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6680286, size 1024
[  188.016986] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6666231, size 1024
[  188.016988] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6696427, size 1024
[  188.016990] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6759868, size 1024
[  193.024897] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348192768, ino 3
[  193.024902] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6759869, size 1024
[  193.024905] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6849594, size 1024
[  193.024907] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6744485, size 1024
[  193.024909] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6759870, size 1024
[  198.032814] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348196864, ino 3
[  198.032819] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493835, size 1024
[  198.032821] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6824997, size 1024
[  198.032823] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 9479863, size 1024
[  198.032825] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 6971932, size 1024
[  203.040755] NILFS warning (device sdc): nilfs_clear_dirty_page: discard page: offset 348200960, ino 3
[  203.040759] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 10806392, size 1024
[  203.040761] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 9560910, size 1024
[  203.040763] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 5493836, size 1024
[  203.040765] NILFS warning (device sdc): nilfs_clear_dirty_page: discard block 9560911, size 1024

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On Tue, 2014-07-08 at 07:08 +0530, dE wrote:

[snip]

[snip]

I suppose that these error messages are sequence of the initially reported issue. Namely, your GC doesn't work because of the issue and NILFS2 volume has exhausted yet. As a result, the file system is remounted in RO mode. Messages about discarding dirty pages take place after remounting in RO mode in the case of trying to flush dirty pages.

Sorry, unfortunately, I have the crazy month and I can't find opportunity for investigation of the issue. I hope that I'll have such opportunity soon.

Thanks,
Vyacheslav Dubeyko.

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Thanks for your corporation. I'll keep reporting whatever I can. Right now I'm trying with 2048 block size. --
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This bug does not persist with 2048 block size.
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On Fri, 2014-07-18 at 13:08 +0530, dE wrote:

[snip]

Thank you for testing. This is the really important detail.

Thanks,
Vyacheslav Dubeyko.

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Today I did hit this bug. But as you might have noticed, it took quiet a lot of time to hit it.

But after I hit this bugs, the FS was unusable. I had to reformat. --
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