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Code Issues Releases Wiki Activity

io_uring: fix false WARN_ONCE

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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
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-06-17 18:13:59 +01:00 committed by Jens Axboe
parent fe76421d1d
commit e6ab8991c5
1 changed files with 4 additions and 1 deletions
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5
fs/io-wq.c
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@ -240,7 +240,8 @@ 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);
@ -901,6 +902,8 @@ 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(struct_size(wq, wqes, nr_node_ids), GFP_KERNEL);
if (!wq)