[Bug 219166] occasional block layer hang when setting 'echo noop > /sys/block/sda/queue/scheduler'

[bugzilla-daemon@kernel.org]

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

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

commit af2814149883e2c1851866ea2afcd8eadc040f79
Author: Christoph Hellwig <hch@lst.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@lst.de>
    Reviewed-by: Bart Van Assche <bvanassche@acm.org>
    Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
    Reviewed-by: Hannes Reinecke <hare@suse.de>
    Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
    Link: https://lore.kernel.org/r/20240617060532.127975-12-hch@lst.de
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

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