From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 919F5C11F7A for ; Tue, 6 Jul 2021 11:54:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 874EF611AF for ; Tue, 6 Jul 2021 11:54:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234865AbhGFL4z (ORCPT ); Tue, 6 Jul 2021 07:56:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:47622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236712AbhGFLfi (ORCPT ); Tue, 6 Jul 2021 07:35:38 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8688161E04; Tue, 6 Jul 2021 11:24:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570645; bh=Ry1aG034I40ds9gCDxFiOmtRE8P3ZjPlXbEhpRWYn94=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZlTseCKFdRzzlDxHj4VbS6f+eskRyhZInTtZY2nBiwF++bmYDmDKnpasjyCzHaVId IXJG1cU8sEBEJHy7cCwla52BGwcBkQgIX9wcoZCl5xyv13pHIABtz/40SNZIQmuSl0 I1nBm2D7YN4nZXlwP1Wz+2X/h3uXpjtnfpQbi5tGcWcoHFcJdtAbyQG5EMSx2nzJwg 9IcYqNx17XxLunr5lzfSkw6LxBKoC4ldwLwYgjfT1M2aTRcJ1GeXFwsR9zKFRy8jaM 0S/KB9j+u+p99v1w9q+AinWKQhdZjMjCtbpj9cTZmke1lfBD34v/OD/2j83HzjujuP 1LIT8WI96GH8g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pavel Begunkov , syzbot+ea2f1484cffe5109dc10@syzkaller.appspotmail.com, Jens Axboe , Sasha Levin , io-uring@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 094/137] io_uring: fix false WARN_ONCE Date: Tue, 6 Jul 2021 07:21:20 -0400 Message-Id: <20210706112203.2062605-94-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706112203.2062605-1-sashal@kernel.org> References: <20210706112203.2062605-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pavel Begunkov [ 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 Link: https://lore.kernel.org/r/f7ede342c3342c4c26668f5168e2993e38bbd99c.1623949695.git.asml.silence@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- 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