[PATCH AUTOSEL 5.10 094/137] io_uring: fix false WARN_ONCE
From: Sasha Levin <sashal@kernel.org>
Date: 2021-07-06 11:54:35
Also in:
io-uring, lkml
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
From: Pavel Begunkov <asml.silence@gmail.com> [ Upstream commit e6ab8991c5d0b0deae0961dc22c0edd1dee328f5 ] WARNING: CPU: 1 PID: 11749 at fs/io-wq.c:244 io_wqe_wake_worker fs/io-wq.c:244 [inline] WARNING: CPU: 1 PID: 11749 at fs/io-wq.c:244 io_wqe_enqueue+0x7f6/0x910 fs/io-wq.c:751 A WARN_ON_ONCE() in io_wqe_wake_worker() can be triggered by a valid userspace setup. Replace it with pr_warn. Reported-by: syzbot+ea2f1484cffe5109dc10@syzkaller.appspotmail.com Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/f7ede342c3342c4c26668f5168e2993e38bbd99c.1623949695.git.asml.silence@gmail.com (local) Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/io-wq.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/io-wq.c b/fs/io-wq.c
index f72d53848dcb..8bb17b6d4de3 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c@@ -299,7 +299,8 @@ static void io_wqe_wake_worker(struct io_wqe *wqe, struct io_wqe_acct *acct) * Most likely an attempt to queue unbounded work on an io_wq that * wasn't setup with any unbounded workers. */ - WARN_ON_ONCE(!acct->max_workers); + if (unlikely(!acct->max_workers)) + pr_warn_once("io-wq is not configured for unbound workers"); rcu_read_lock(); ret = io_wqe_activate_free_worker(wqe);
@@ -1085,6 +1086,8 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) if (WARN_ON_ONCE(!data->free_work || !data->do_work)) return ERR_PTR(-EINVAL); + if (WARN_ON_ONCE(!bounded)) + return ERR_PTR(-EINVAL); wq = kzalloc(sizeof(*wq), GFP_KERNEL); if (!wq)
--
2.30.2