linux-ext4 - [Bug 211733] New: ext4 file system unrecoverable corruption

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Date:   Sat, 13 Feb 2021 15:55:11 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 211733] New: ext4 file system unrecoverable corruption

https://bugzilla.kernel.org/show_bug.cgi?id=211733

            Bug ID: 211733
           Summary: ext4 file system unrecoverable corruption
           Product: File System
           Version: 2.5
    Kernel Version: 5.4.0-65-generic
          Hardware: i386
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: martrw@...oo.com
        Regression: No

Kubuntu 20.04, two week old installation
500 SATA HDD, 50GiB / partition/ 180GiB /home partition
Dual boot with Win7 on 50GiB partition

Observation:
Was switching between the Win7 OS and Linux with multiple reboots in short
spans of time(<5min).  From Linux OS using Dolphin I moved ~5MB document files
from Win7 partition to Linux /home/xxx/Documents directory and rebooted system
to return to Win7.  Made changes in Win7 as needed and booted back into Linux. 
I noticed the entire Documents directory was missing, about 50GiB files. 
Immediately shut down system and booted up Linux on duplicate drive containing
image from about two weeks prior.  Made read only image of /home directory from
corrupted drive and placed on external 1 GiB backup drive.

Using R-Linux, extundelete, debugfs no trace of the Documents directory can be
located on the image or the original /home directory.  I can see files I
intentionally deleted during normal operations for over a week prior.

fsck, smartctl indicate no disk issues.

I have not tried to reproduce this issue.

This event seems very similar to the one discuss in this link but I have not
been able to locate that particular bug.

https://www.itnews.com.au/news/stable-linux-kernels-hit-by-serious-file-system-bug-320709

I entered bug report on the bugs.kde.org bug tracker(432762) but was told that
the issue is lower level than the Dolphin gui which I was using.

Apologies if this is a duplicate, but I could not find a similar issue on this
tracker.

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