LittleFS: Meet bad block on master

[ccli8]

Description of defect

Target(s) affected by this defect ?

K64F

Toolchain(s) (name and version) displaying this defect ?

ARM Compiler 6.11

What version of Mbed-os are you using (tag or sha) ?

4b41a6f Merge pull request #11915 from AriParkkila/tests-sendtimeout

mbed-os-example-filesystem

17cbb12 Merge pull request #106 from hugueskamba/hk-iotcore-1318-remove-fp-usage-in-example-projects

How is this defect reproduced ?

Without modification, compile mbed-os-example-filesystem with:

mbed compile -m K64F -t ARMC6

Flash and see error with LittleFS:

--- Mbed OS filesystem example ---
Mounting the filesystem... lfs error:494: Corrupted dir pair at 0 1
lfs error:2222: Invalid superblock at 0 1
Fail :(
No filesystem found, formatting... lfs debug:617: Bad block at 3
lfs debug:617: Bad block at 4
lfs debug:617: Bad block at 5
lfs debug:617: Bad block at 6
lfs debug:617: Bad block at 7
lfs debug:617: Bad block at 8

If I change mbed-os version to mbed-os-5.14.2, LittleFS is OK:

--- Mbed OS filesystem example ---
Mounting the filesystem... OK
Opening "/fs/numbers.txt"... OK
Incrementing numbers (10/10)... OK
Closing "/fs/numbers.txt"... OK
Opening the root directory... OK
root directory:
    .
    ..
    numbers.txt
Closing the root directory... OK
Opening "/fs/numbers.txt"... OK
numbers:
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
Closing "/fs/numbers.txt"... OK
Unmounting... OK
Mbed OS filesystem example done!

[0xc0170]

cc @ARMmbed/mbed-os-storage

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOTRIAGE-2380

[kjbracey]

Duplicate of #11879

[ccli8]

According to #11879 (comment), check master and it's OK.

With #11879 open, close this one.