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[23.128.96.18]) by mx.google.com with ESMTP id ka11si7796537ejc.367.2021.07.15.07.19.32; Thu, 15 Jul 2021 07:19:56 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@natalenko.name header.s=dkim-20170712 header.b=PF+k6DqF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=natalenko.name Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232053AbhGON7h (ORCPT + 99 others); Thu, 15 Jul 2021 09:59:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229637AbhGON7h (ORCPT ); Thu, 15 Jul 2021 09:59:37 -0400 Received: from vulcan.natalenko.name (vulcan.natalenko.name [IPv6:2001:19f0:6c00:8846:5400:ff:fe0c:dfa0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C224DC06175F for ; Thu, 15 Jul 2021 06:56:43 -0700 (PDT) Received: from spock.localnet (unknown [151.237.229.131]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by vulcan.natalenko.name (Postfix) with ESMTPSA id A67B4B359F6; Thu, 15 Jul 2021 15:56:39 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=natalenko.name; s=dkim-20170712; t=1626357399; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=5gFrzAD9gyEok+Qia8gREMsY5VrLSVlLzSrbiOJZrQA=; b=PF+k6DqFcu5D/fykPd7emT6g0TUoA0bFlVszGVmwQT7gLLPd+V4+8EdCQQqC/M2A11aQ+i FgSk8mUDh3ReH72HC0rYNLN9C0ayej8EtuDlljX8FIkHItm/liBZaAZjcX/YdLFLY+sP6y Z76SpW5PDMV3vypY1B1JqaqS8LrcIOY= From: Oleksandr Natalenko To: linux-kernel@vger.kernel.org, Jens Axboe , Christoph Hellwig , Sagi Grimberg , linux-nvme@lists.infradead.org, David Jeffery , Ming Lei , Laurence Oberman , Paolo Valente , Jan Kara , Sasha Levin , Greg Kroah-Hartman Cc: Keith Busch Subject: New warning in nvme_setup_discard Date: Thu, 15 Jul 2021 15:56:38 +0200 Message-ID: <4729812.CpyZKHjjVO@natalenko.name> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello. After a v5.13.2 massive update I encountered this: ``` [19231.556665] ------------[ cut here ]------------ [19231.556674] WARNING: CPU: 20 PID: 502 at drivers/nvme/host/core.c:850 nvme_setup_discard+0x188/0x1f0 ... [19231.556776] CPU: 20 PID: 502 Comm: kworker/20:1H Not tainted 5.13.2 #1 [19231.556780] Hardware name: ASUS System Product Name/Pro WS X570-ACE, BIOS 3601 05/26/2021 [19231.556784] Workqueue: kblockd blk_mq_run_work_fn [19231.556789] RIP: 0010:nvme_setup_discard+0x188/0x1f0 [19231.556794] Code: 49 8b 44 24 10 4c 8b 90 40 0b 00 00 4c 2b 15 8f 09 d8 00 49 c1 fa 06 49 c1 e2 0c 4c 03 15 90 09 d8 00 4d 89 d0 e9 b9 fe ff ff <0f> 0b b8 00 00 00 80 49 01 c2 72 52 48 c7 c0 00 00 00 80 48 2b 05 [19231.556798] RSP: 0018:ffffaed2416efc00 EFLAGS: 00010287 [19231.556802] RAX: ffff8e67fb580000 RBX: ffff8e640bbe5240 RCX: 0000000000000020 [19231.556805] RDX: ffff8e67fb580000 RSI: 000000000000001f RDI: 0000000000000000 [19231.556808] RBP: ffff8e640bbe5388 R08: ffff8e677b580000 R09: 0000000008abb800 [19231.556811] R10: ffff8e677b580000 R11: 0000000000000400 R12: ffff8e6405999c00 [19231.556814] R13: 000000000000001f R14: ffff8e6405693000 R15: ffff8e640bbaf800 [19231.556816] FS: 0000000000000000(0000) GS:ffff8e6b0ef00000(0000) knlGS: 0000000000000000 [19231.556819] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [19231.556822] CR2: ffff888c76ece000 CR3: 000000047a184000 CR4: 0000000000350ee0 [19231.556825] Call Trace: [19231.556830] nvme_setup_cmd+0x2d0/0x670 [19231.556834] nvme_queue_rq+0x79/0xc90 [19231.556837] ? __sbitmap_get_word+0x30/0x80 [19231.556842] ? sbitmap_get+0x85/0x180 [19231.556846] blk_mq_dispatch_rq_list+0x15c/0x810 [19231.556851] ? list_sort+0x21d/0x2f0 [19231.556856] __blk_mq_do_dispatch_sched+0x196/0x320 [19231.556860] __blk_mq_sched_dispatch_requests+0x14d/0x190 [19231.556864] blk_mq_sched_dispatch_requests+0x2f/0x60 [19231.556867] blk_mq_run_work_fn+0x43/0xc0 [19231.556871] process_one_work+0x24e/0x430 [19231.556876] worker_thread+0x54/0x4d0 [19231.556880] ? process_one_work+0x430/0x430 [19231.556883] kthread+0x1b3/0x1e0 [19231.556886] ? __kthread_init_worker+0x50/0x50 [19231.556889] ret_from_fork+0x22/0x30 [19231.556895] ---[ end trace d9abdf019a56b4c7 ]--- [19231.556906] blk_update_request: I/O error, dev nvme1n1, sector 632935424 op 0x3:(DISCARD) flags 0x0 phys_seg 31 prio class 0 ``` or, in code: ``` 850 if (WARN_ON_ONCE(n != segments)) { 851 if (virt_to_page(range) == ns->ctrl->discard_page) 852 clear_bit_unlock(0, &ns->ctrl->discard_page_busy); 853 else 854 kfree(range); 855 return BLK_STS_IOERR; 856 } ``` BFQ scheduler is in use. Something similar was already fixed by a958937ff166fc60d1c3a721036f6ff41bfa2821, but I do not have a multipath device here, it's just 2 NVMe SSDs in a soft RAID10 with LUKS and LVM. Any idea what this might mean? v5.13.2 brought some commit into a stable tree that are, as I still suspect, causing unreproducible panics [1] [2]. Previously, I dropped that extra stuff from my kernel build and had no issues. This time I also do not have any extra commits in the block layer, only those that are in v5.13.2. Thanks. [1] https://lore.kernel.org/linux-block/3533087.dJKXTdksHR@spock/ [2] https://lore.kernel.org/linux-block/2957867.CS06ZTPI5V@spock/ -- Oleksandr Natalenko (post-factum)