linux-ext4 - [Bug 219166] ext4 hang when setting echo noop

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Message-ID: <bug-219166-13602-ww7sjzkrOf@https.bugzilla.kernel.org/>
Date: Fri, 16 Aug 2024 16:40:19 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 219166] ext4 hang when setting echo noop >
 /sys/block/sda/queue/scheduler

https://bugzilla.kernel.org/show_bug.cgi?id=219166

Theodore Tso (tytso@....edu) changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@....edu

--- Comment #1 from Theodore Tso (tytso@....edu) ---
This is a bug in the block layer, not in ext4.  It's also a fairly
long-standing issue; I remember seeing something like in our Data Center
kernels at $WORK at least five plus years ago.   At the time, we dealt with
this via the simple expedient of "Doctor, Doctor, it hurts when I do that. 
Well, then don't do that then!"

At the time it happened relatively rarely; if you're able to reliably reproduce
it, perhaps it would be useful to send a script with said reliable reproducer
to the linux-block list, and perhaps try to do a bisect to see when it became
trivially easy to trigger.

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