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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,URIBL_RHS_DOB,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 22B0FC35669 for ; Sun, 23 Feb 2020 02:35:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAA8B20659 for ; Sun, 23 Feb 2020 02:35:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582425301; bh=B121PA6hXOFvZznG/7fDaBlo/sGgh6O5jluLJi1gRzE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0O5NgwYzp6QLlbqqbMllAmFx22a7y5BKKyJd0Q9VGnQ6yUgyTKzE8+qYzQC3R5dxH RwhxUNffY8a01SSaxvqbct/l8A1YtQ1RU4+nSqMrXjByxxq6Ixh6+kwMcdjy0G5Vtw Mq4CSRj+Er75meSE3ev/u3EtEPcL1fxzI1RplCFc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728099AbgBWCWT (ORCPT ); Sat, 22 Feb 2020 21:22:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:51272 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728081AbgBWCWT (ORCPT ); Sat, 22 Feb 2020 21:22:19 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6B0C92067D; Sun, 23 Feb 2020 02:22:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582424538; bh=B121PA6hXOFvZznG/7fDaBlo/sGgh6O5jluLJi1gRzE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i29fUSWejuaamN9X2xMIwYo4nWhAJv0QZzyPOb74Efb79AsnXZS7XsiUdVT/6qBPg X8Rwk+RGUjVOruIlZbJW/hAhoZs9aNilRNEfRmOJYGpJRaGuX2njnyL+ptZs+IQrXR SLV6brBQ+vVl64Il+bfyjiWchRTagYCCoVC3FIpY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jens Axboe , Glauber Costa , Sasha Levin , linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH AUTOSEL 5.5 48/58] io-wq: don't call kXalloc_node() with non-online node Date: Sat, 22 Feb 2020 21:21:09 -0500 Message-Id: <20200223022119.707-48-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200223022119.707-1-sashal@kernel.org> References: <20200223022119.707-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Jens Axboe [ Upstream commit 7563439adfae153b20331f1567c8b5d0e5cbd8a7 ] Glauber reports a crash on init on a box he has: RIP: 0010:__alloc_pages_nodemask+0x132/0x340 Code: 18 01 75 04 41 80 ce 80 89 e8 48 8b 54 24 08 8b 74 24 1c c1 e8 0c 48 8b 3c 24 83 e0 01 88 44 24 20 48 85 d2 0f 85 74 01 00 00 <3b> 77 08 0f 82 6b 01 00 00 48 89 7c 24 10 89 ea 48 8b 07 b9 00 02 RSP: 0018:ffffb8be4d0b7c28 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000e8e8 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000002080 RBP: 0000000000012cc0 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000dc0 R11: ffff995c60400100 R12: 0000000000000000 R13: 0000000000012cc0 R14: 0000000000000001 R15: ffff995c60db00f0 FS: 00007f4d115ca900(0000) GS:ffff995c60d80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000002088 CR3: 00000017cca66002 CR4: 00000000007606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: alloc_slab_page+0x46/0x320 new_slab+0x9d/0x4e0 ___slab_alloc+0x507/0x6a0 ? io_wq_create+0xb4/0x2a0 __slab_alloc+0x1c/0x30 kmem_cache_alloc_node_trace+0xa6/0x260 io_wq_create+0xb4/0x2a0 io_uring_setup+0x97f/0xaa0 ? io_remove_personalities+0x30/0x30 ? io_poll_trigger_evfd+0x30/0x30 do_syscall_64+0x5b/0x1c0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f4d116cb1ed which is due to the 'wqe' and 'worker' allocation being node affine. But it isn't valid to call the node affine allocation if the node isn't online. Setup structures for even offline nodes, as usual, but skip them in terms of thread setup to not waste resources. If the node isn't online, just alloc memory with NUMA_NO_NODE. Reported-by: Glauber Costa Tested-by: Glauber Costa Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- fs/io-wq.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/fs/io-wq.c b/fs/io-wq.c index 0dc4bb6de6566..25ffb6685baea 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -666,11 +666,16 @@ static int io_wq_manager(void *data) /* create fixed workers */ refcount_set(&wq->refs, workers_to_create); for_each_node(node) { + if (!node_online(node)) + continue; if (!create_io_worker(wq, wq->wqes[node], IO_WQ_ACCT_BOUND)) goto err; workers_to_create--; } + while (workers_to_create--) + refcount_dec(&wq->refs); + complete(&wq->done); while (!kthread_should_stop()) { @@ -678,6 +683,9 @@ static int io_wq_manager(void *data) struct io_wqe *wqe = wq->wqes[node]; bool fork_worker[2] = { false, false }; + if (!node_online(node)) + continue; + spin_lock_irq(&wqe->lock); if (io_wqe_need_worker(wqe, IO_WQ_ACCT_BOUND)) fork_worker[IO_WQ_ACCT_BOUND] = true; @@ -793,7 +801,9 @@ static bool io_wq_for_each_worker(struct io_wqe *wqe, list_for_each_entry_rcu(worker, &wqe->all_list, all_list) { if (io_worker_get(worker)) { - ret = func(worker, data); + /* no task if node is/was offline */ + if (worker->task) + ret = func(worker, data); io_worker_release(worker); if (ret) break; @@ -1006,6 +1016,8 @@ void io_wq_flush(struct io_wq *wq) for_each_node(node) { struct io_wqe *wqe = wq->wqes[node]; + if (!node_online(node)) + continue; init_completion(&data.done); INIT_IO_WORK(&data.work, io_wq_flush_func); data.work.flags |= IO_WQ_WORK_INTERNAL; @@ -1038,12 +1050,15 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) for_each_node(node) { struct io_wqe *wqe; + int alloc_node = node; - wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, node); + if (!node_online(alloc_node)) + alloc_node = NUMA_NO_NODE; + wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node); if (!wqe) goto err; wq->wqes[node] = wqe; - wqe->node = node; + wqe->node = alloc_node; wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded; atomic_set(&wqe->acct[IO_WQ_ACCT_BOUND].nr_running, 0); if (wq->user) { @@ -1051,7 +1066,6 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) task_rlimit(current, RLIMIT_NPROC); } atomic_set(&wqe->acct[IO_WQ_ACCT_UNBOUND].nr_running, 0); - wqe->node = node; wqe->wq = wq; spin_lock_init(&wqe->lock); INIT_WQ_LIST(&wqe->work_list); -- 2.20.1