linux-ext4 - [Bug 219166] occasional block layer hang when setting 'echo noop

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Message-ID: <bug-219166-13602-wlxrEbsfjL@https.bugzilla.kernel.org/>
Date: Fri, 06 Sep 2024 19:46:44 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 219166] occasional block layer hang when setting 'echo noop >
 /sys/block/sda/queue/scheduler'

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

--- Comment #14 from Richard W.M. Jones (rjones@...hat.com) ---
I think I have bisected this to:

commit af2814149883e2c1851866ea2afcd8eadc040f79
Author: Christoph Hellwig <hch@....de>
Date:   Mon Jun 17 08:04:38 2024 +0200

    block: freeze the queue in queue_attr_store

    queue_attr_store updates attributes used to control generating I/O, and
    can cause malformed bios if changed with I/O in flight.  Freeze the queue
    in common code instead of adding it to almost every attribute.

    Signed-off-by: Christoph Hellwig <hch@....de>
    Reviewed-by: Bart Van Assche <bvanassche@....org>
    Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
    Reviewed-by: Hannes Reinecke <hare@...e.de>
    Reviewed-by: Chaitanya Kulkarni <kch@...dia.com>
    Link: https://lore.kernel.org/r/20240617060532.127975-12-hch@lst.de
    Signed-off-by: Jens Axboe <axboe@...nel.dk>

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