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

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Message-ID: <bug-219166-13602-GUDuevO7lS@https.bugzilla.kernel.org/>
Date: Fri, 16 Aug 2024 17:06:33 +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

--- Comment #2 from Richard W.M. Jones (rjones@...hat.com) ---
We did indeed work around it by not doing it:
https://github.com/libguestfs/libguestfs/commit/b2d682a4730ead8b4ae07e5aaf6fa230c5eec305
so my interest in this bug is now limited.  If you want to close it then that's
fine.

It's unfortunately triggered very rarely.  The only test I have is:

$ while guestfish -a /dev/null run -vx >& /tmp/log ; do echo -n . ; done

but that hits the bug less than 1 in 200 iterations (although more often when
run in a qemu VM using software emulation, which is where we first hit this.)

I tried to write something that could trigger it more frequently by having a
loop in a guest writing to queue/scheduler, while another loop in the guest
would write to the disk, but I couldn't seem to hit the bug at all.

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