linux-ext4 - [Bug 220842] dmesg flooded with ext4 backtraces when underlying USB device chokes

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Message-ID: <bug-220842-13602-ElDC2TcU2t@https.bugzilla.kernel.org/>
Date: Sun, 07 Dec 2025 11:13:44 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 220842] dmesg flooded with ext4 backtraces when underlying USB
 device chokes

https://bugzilla.kernel.org/show_bug.cgi?id=220842

--- Comment #3 from Deweloper (deweloper@...pl) ---
This message and tons of call traces overflowing dmesg buffer make me think
there is some software bug in ext4 fs driver:

<2>[ 5451.308209] EXT4-fs (sdb1): This should not happen!! Data will be lost

What should not happen?
Some invalid internal state?
Or an external event out of control of the software, like disappearing block
device, what is normal/expected?
In other words, is all of this noise just a way to say that a mounted device is
lost?

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