ext4: debugfs: icheck: Input/output error while calling ext2fs_block_iterate

[local10 <local10@tutanota.com>]

Hi,

Started to get SMART self test errors and wanted to fix them before things would get any worse:

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed: read failure       60%     24805         624048

So I calculated the file sytem block number of the bad LBA according to the following formula:

b = (int) ((L-S) * 512 / B)

where:
b = File System block number
B = File system block size in bytes
L = LBA of bad sector
S = Starting sector of partition as shown by fdisk -lu
and (int) denotes the integer part.


The bad file system block number turned out to be 950 in my case. However, trying to find out what file this block number belongs to failed (see below, /dev/sda2 contains an ext4 root file system that was mounted as root when debugfs was run):

# debugfs
debugfs 1.44.5 (15-Dec-2018)
debugfs:  open /dev/sda2
debugfs:  testb 950
Block 950 marked in use
debugfs:  icheck 950
icheck: Input/output error while calling ext2fs_block_iterate
icheck: Can't read next inode while doing inode scan
debugfs:  quit
#

Any ideas? Thanks

# uname -a
Linux srv 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1 (2019-09-20) x86_64 GNU/Linux