linux-ext4 - [Bug 207635] EXT4-fs error (device sda3): ext4_lookup:1701: inode #...: comm find: casefold flag without casefold feature; EXT4-fs (sda3): Remounting filesystem read-only

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Date:   Sun, 10 May 2020 20:37:42 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 207635] EXT4-fs error (device sda3): ext4_lookup:1701: inode
 #...: comm find: casefold flag without casefold feature; EXT4-fs (sda3):
 Remounting filesystem read-only

https://bugzilla.kernel.org/show_bug.cgi?id=207635

Joerg M. Sigle (joerg.sigle@...gle.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|5.5.11, 5.5.10              |5.4.20, 5.5.10, 5.5.11,
                   |                            |5.6.11

--- Comment #2 from Joerg M. Sigle (joerg.sigle@...gle.com) ---
After upgrade to 5.6.11, once again had the root filesystem become read only.

I'm now going back to 5.3.15 which may have been the last unproblematic version
I tried - just to verify once more that the problem doesn't occur with that
older version.

N.B.: Googling "casefold flag without casefold feature" returned a patch - and
most probably, the same problem for someone else in Kernel 5.4 vs. 5.3:

https://patchwork.ozlabs.org/project/linux-ext4/patch/20190903054324.20072-1-tytso@mit.edu/
> ext4: fix kernel oops caused by spurious casefold flag

https://forum.armbian.com/topic/13111-solved-5420-vs-539-arbian-bionic/
> 5.4.20: EXT4-fs error (device mmcblk0p1): ext4_lookup:1700: inode #4950: comm
> rsync: casefold flag without casefold feature
> 5.3.9: without error 


So the problem may have been adressed - but that was in 2019; I'm wondering how
it could still be there in May 2020 kernels?

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