FAILED: patch "[PATCH] block, bfq: fix uaf for accessing waker_bfqq after splitting" failed to apply to 4.19-stable tree

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The patch below does not apply to the 4.19-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@xxxxxxxxxxxxxxx>.

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-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x 1ba0403ac6447f2d63914fb760c44a3b19c44eaf
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2024100223-gutter-exchange-0c2b@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

1ba0403ac644 ("block, bfq: fix uaf for accessing waker_bfqq after splitting")
fd571df0ac5b ("block, bfq: turn bfqq_data into an array in bfq_io_cq")
a61230470c8c ("block, bfq: move io_cq-persistent bfqq data into a dedicated struct")
9778369a2d6c ("block, bfq: split sync bfq_queues on a per-actuator basis")
246cf66e300b ("block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq")
337366e02b37 ("block, bfq: replace 0/1 with false/true in bic apis")
64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'")
a1795c2ccb1e ("bfq: fix waker_bfqq inconsistency crash")
dc469ba2e790 ("block/bfq: Use the new blk_opf_t type")
f950667356ce ("bfq: Relax waker detection for shared queues")
4e54a2493e58 ("bfq: Get rid of __bio_blkcg() usage")
09f871868080 ("bfq: Track whether bfq_group is still online")
ea591cd4eb27 ("bfq: Update cgroup information before merging bio")
3bc5e683c67d ("bfq: Split shared queues on move between cgroups")
70456e5210f4 ("bfq: Avoid false marking of bic as stably merged")
f6bad159f5d5 ("block/bfq-iosched.c: use "false" rather than "BLK_RW_ASYNC"")
a0725c22cd84 ("bfq: use bfq_bic_lookup in bfq_limit_depth")
1f18b7005b49 ("bfq: Limit waker detection in time")
76f1df88bbc2 ("bfq: Limit number of requests consumed by each cgroup")
44dfa279f117 ("bfq: Store full bitmap depth in bfq_data")

thanks,

greg k-h

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


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