The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x fc0e982b8a3a169b1c654d9a1aa45bf292943ef2 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025041715-pasty-linked-066f@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From fc0e982b8a3a169b1c654d9a1aa45bf292943ef2 Mon Sep 17 00:00:00 2001 From: Ming Lei ming.lei@redhat.com Date: Mon, 10 Mar 2025 19:54:53 +0800 Subject: [PATCH] block: make sure ->nr_integrity_segments is cloned in blk_rq_prep_clone

Make sure ->nr_integrity_segments is cloned in blk_rq_prep_clone(), otherwise requests cloned by device-mapper multipath will not have the proper nr_integrity_segments values set, then BUG() is hit from sg_alloc_table_chained().

Fixes: b0fd271d5fba ("block: add request clone interface (v2)") Cc: stable@vger.kernel.org Cc: Christoph Hellwig hch@infradead.org Signed-off-by: Ming Lei ming.lei@redhat.com Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20250310115453.2271109-1-ming.lei@redhat.com Signed-off-by: Jens Axboe axboe@kernel.dk

diff --git a/block/blk-mq.c b/block/blk-mq.c index b9550a127c8e..f1030d589a1b 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3314,6 +3314,7 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src, rq->special_vec = rq_src->special_vec; } rq->nr_phys_segments = rq_src->nr_phys_segments; + rq->nr_integrity_segments = rq_src->nr_integrity_segments;

if (rq->bio && blk_crypto_rq_bio_prep(rq, rq->bio, gfp_mask) < 0) goto free_and_out;