This is a note to let you know that I've just added the patch titled
io_uring/futex: always remove futex entry for cancel all
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-futex-always-remove-futex-entry-for-cancel-.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a4dbe0cc7c1b46dd53f46b2d99c5d7484a434c26
Author: Jens Axboe <axboe@xxxxxxxxx>
Date: Fri Mar 15 15:37:15 2024 -0600
io_uring/futex: always remove futex entry for cancel all
[ Upstream commit 30dab608c3cb99c2a05b76289fd05551703979ae ]
We know the request is either being removed, or already in the process of
being removed through task_work, so we can delete it from our futex list
upfront. This is important for remove all conditions, as we otherwise
will find it multiple times and prevent cancelation progress.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 194bb58c6090 ("io_uring: add support for futex wake and wait")
Fixes: 8f350194d5cf ("io_uring: add support for vectored futex waits")
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/io_uring/futex.c b/io_uring/futex.c
index 3c3575303c3d0..792a03df58dea 100644
--- a/io_uring/futex.c
+++ b/io_uring/futex.c
@@ -159,6 +159,7 @@ bool io_futex_remove_all(struct io_ring_ctx *ctx, struct task_struct *task,
hlist_for_each_entry_safe(req, tmp, &ctx->futex_list, hash_node) {
if (!io_match_task_safe(req, task, cancel_all))
continue;
+ hlist_del_init(&req->hash_node);
__io_futex_cancel(ctx, req);
found = true;
}
