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SubjectRe: BUG: unable to handle kernel NULL pointer dereference at 00000000000000a8 in nilfs_segctor_do_construct
Date
Hi Viacheslav,

Viacheslav Dubeyko <slava@dubeyko.com> writes:
> (1) the partition size?

the first disk with crash was 1TB

the second disk with crash, which i have by me, is 2TB:

$ lsblk /dev/sdb
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdb 8:16 0 1.8T 0 disk
└─extdisk 254:2 0 1.8T 0 crypt /mnt/b

> (2) the logical block size?
> (3) the segment size?

how can i find (2) and (3) out?

here is the output of nilfs-tune:

$ sudo nilfs-tune -l /dev/mapper/extdisk
nilfs-tune 2.2.7
Filesystem volume name: backup1_nilfs2
Filesystem UUID: 7d9708f9-464f-41b7-a0c6-eda18741012f
Filesystem magic number: 0x3434
Filesystem revision #: 2.0
Filesystem features: (none)
Filesystem state: valid
Filesystem OS type: Linux
Block size: 4096
Filesystem created: Thu Dec 27 14:14:14 2018
Last mount time: Fri Dec 20 13:06:15 2019
Last write time: Thu Jan 23 13:04:30 2020
Mount count: 15
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: 238465
Device size: 2000396834816
First data block: 1
# of blocks per segment: 2048
Reserved segments %: 5
Last checkpoint #: 9884
Last block address: 280841435
Last sequence #: 137120
Free blocks count: 207591424
Commit interval: 0
# of blks to create seg: 0
CRC seed: 0x5172270a
CRC check sum: 0x2ef767d2
CRC check data size: 0x00000118

it seems strange that the last write time is today, even though i
mounted the partition read-only

/dev/mapper/extdisk on /mnt/b type nilfs2 (ro,relatime)

> (4) how the partition was created?

using parted
then cryptsetup luksFormat
then cryptsetup luksOpen
then mkfs.nilfs2

> (5) the version of tools that created the partition?

how can i find this out? is it saved somewhere?

> (6) the amount of free space on the partition?

/dev/mapper/extdisk 1.9T 1.1T 699G 61% /mnt/b

Regards,

Tomas

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