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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 208D1C4332F for ; Mon, 21 Nov 2022 12:07:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230218AbiKUMG4 (ORCPT ); Mon, 21 Nov 2022 07:06:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230129AbiKUMGz (ORCPT ); Mon, 21 Nov 2022 07:06:55 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 238A51EC6E for ; Mon, 21 Nov 2022 04:06:55 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id B38926113C for ; Mon, 21 Nov 2022 12:06:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA54DC433C1; Mon, 21 Nov 2022 12:06:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669032414; bh=p2goEZw2fN6qPhCAS5w+uPdCaLao3Vc8HE6JQ9YehJk=; h=Subject:To:Cc:From:Date:From; b=2pQJTDzPKnLoSqnZ9lI93Eglm/9pdp26JDTpkOAGd8kKdgVOFUpDrKlcuVmvGEn10 IeRF8SqaXJhd4D8N4BinDE4taSlZXRa0hgLtzNo1yqRI2hsuC5HbZ9Ixd4G3yRrsJn kTLLSrPCflyqw12MH25SJAwR0aD6gUOLroz/D3pg= Subject: FAILED: patch "[PATCH] io_uring: fix tw losing poll events" failed to apply to 5.15-stable tree To: asml.silence@gmail.com, axboe@kernel.dk Cc: From: Date: Mon, 21 Nov 2022 13:04:06 +0100 Message-ID: <1669032246212254@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.15-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 . Possible dependencies: 539bcb57da2f ("io_uring: fix tw losing poll events") 329061d3e2f9 ("io_uring: move poll handling into its own file") cfd22e6b3319 ("io_uring: add opcode name to io_op_defs") c9f06aa7de15 ("io_uring: move io_uring_task (tctx) helpers into its own file") a4ad4f748ea9 ("io_uring: move fdinfo helpers to its own file") e5550a1447bf ("io_uring: use io_is_uring_fops() consistently") 17437f311490 ("io_uring: move SQPOLL related handling into its own file") 59915143e89f ("io_uring: move timeout opcodes and handling into its own file") e418bbc97bff ("io_uring: move our reference counting into a header") 36404b09aa60 ("io_uring: move msg_ring into its own file") f9ead18c1058 ("io_uring: split network related opcodes into its own file") e0da14def1ee ("io_uring: move statx handling to its own file") a9c210cebe13 ("io_uring: move epoll handler to its own file") 4cf90495281b ("io_uring: add a dummy -EOPNOTSUPP prep handler") 99f15d8d6136 ("io_uring: move uring_cmd handling to its own file") cd40cae29ef8 ("io_uring: split out open/close operations") 453b329be5ea ("io_uring: separate out file table handling code") f4c163dd7d4b ("io_uring: split out fadvise/madvise operations") 0d5847274037 ("io_uring: split out fs related sync/fallocate functions") 531113bbd5bf ("io_uring: split out splice related operations") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 539bcb57da2f58886d7d5c17134236b0ec9cd15d Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Thu, 17 Nov 2022 18:40:15 +0000 Subject: [PATCH] io_uring: fix tw losing poll events We may never try to process a poll wake and its mask if there was multiple wake ups racing for queueing up a tw. Force io_poll_check_events() to update the mask by vfs_poll(). Cc: stable@vger.kernel.org Fixes: aa43477b04025 ("io_uring: poll rework") Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/00344d60f8b18907171178d7cf598de71d127b0b.1668710222.git.asml.silence@gmail.com Signed-off-by: Jens Axboe diff --git a/io_uring/poll.c b/io_uring/poll.c index 90920abf91ff..c34019b18211 100644 --- a/io_uring/poll.c +++ b/io_uring/poll.c @@ -228,6 +228,13 @@ static int io_poll_check_events(struct io_kiocb *req, bool *locked) return IOU_POLL_DONE; if (v & IO_POLL_CANCEL_FLAG) return -ECANCELED; + /* + * cqe.res contains only events of the first wake up + * and all others are be lost. Redo vfs_poll() to get + * up to date state. + */ + if ((v & IO_POLL_REF_MASK) != 1) + req->cqe.res = 0; /* the mask was stashed in __io_poll_execute */ if (!req->cqe.res) {