[Bug 201685] ext4 file system corruption

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201685

--- Comment #23 from Theodore Tso (tytso@mit.edu) ---
Jimmy, I don't blame you.   Unfortunately, I don't have a clean repro of the
problem because when I tried building a 4.20-rc2 kernel with
CONFIG_SCSI_MQ_DEFAULT=y, and tried running gce-xfstests, no problems were
detected.  And I'm too chicken to try running a kernel version which does have
the problem reported with CONFIG_SCSI_MQ_DEFAULT=y on my primary development
laptop.   :-)

I will say that if you are seeing problems on a particular file system (e.g.
/), by the time the kernel is reporting inconsistencies, the damage is already
done. Yes, you might want to try doing a backup before you reboot, in case the
system doesn't come back, but realistically speaking, the longer you keep
running, the problems are more likely to compound.

So from a personally very selfish perspective, I'm hoping someone who has
already suffered corruption problems is willing to try either 4.19.3, or
disabling CONFIG_SCSI_MQ_DEFAULT, or both, and report that they are no longer
seeing problems, than my putting my own personal data at risk....

Maybe over T-day weekend, I'll try doing a full backup, and then try using
4.19.3 on my personal laptop --- but a "it works fine for me" report won't
necessarily mean anything, since to date I'm not able to reproduce the problem
on one of my systems.

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