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charset="utf-8" Resending, as it seems to have gotten lost. ---------- Forwarded message --------- From: Heinz Mauelshagen Date: Tue, Sep 23, 2025 at 2:58=E2=80=AFPM Subject: [PATCH V2] md raid: fix hang when stopping arrays with metadata through dm-raid To: , Cc: , , Heinz Mauelshagen When using device-mapper's dm-raid target, stopping a RAID array can cause = the system to hang under specific conditions. This occurs when: - A dm-raid managed device tree is suspended from top to bottom (the top-level RAID device is suspended first, followed by its underlying metadata and data devices) - The top-level RAID device is then removed Removing the top-level device triggers a hang in the following sequence: the dm-raid destructor calls md_stop(), which tries to flush the write-intent bitmap by writing to the metadata sub-devices. However, these devices are already suspended, making them unable to complete the write operations and causing an indefinite bloc= k. Fix: - Prevent bitmap flushing when md_stop() is called from dm-raid destructor context and avoid a quiescing/unquescing cycle which could also cause I/O - Still allow write-intent bitmap flushing when called from dm-raid suspend context This ensures that RAID array teardown can complete successfully even when t= he underlying devices are in a suspended state. This second patch uses md_is_rdwr() to distinguish between suspend and destructor paths as elaborated on above. Signed-off-by: Heinz Mauelshagen --- drivers/md/md.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 4e033c26fdd4..78408d2f78fc 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6541,12 +6541,14 @@ static void __md_stop_writes(struct mddev *mddev) { timer_delete_sync(&mddev->safemode_timer); - if (mddev->pers && mddev->pers->quiesce) { - mddev->pers->quiesce(mddev, 1); - mddev->pers->quiesce(mddev, 0); - } + if (md_is_rdwr(mddev) || !mddev_is_dm(mddev)) { + if (mddev->pers && mddev->pers->quiesce) { + mddev->pers->quiesce(mddev, 1); + mddev->pers->quiesce(mddev, 0); + } - mddev->bitmap_ops->flush(mddev); + mddev->bitmap_ops->flush(mddev); + } if (md_is_rdwr(mddev) && ((!mddev->in_sync && !mddev_is_clustered(mddev)) || -- 2.51.0