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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AEB8C433F5 for ; Fri, 8 Oct 2021 03:22:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C90A60FE3 for ; Fri, 8 Oct 2021 03:22:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229783AbhJHDYg (ORCPT ); Thu, 7 Oct 2021 23:24:36 -0400 Received: from szxga01-in.huawei.com ([45.249.212.187]:13709 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229644AbhJHDYg (ORCPT ); Thu, 7 Oct 2021 23:24:36 -0400 Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.53]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4HQYPK3GXszWlTl; Fri, 8 Oct 2021 11:21:09 +0800 (CST) Received: from dggema762-chm.china.huawei.com (10.1.198.204) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.8; Fri, 8 Oct 2021 11:22:39 +0800 Received: from [10.174.176.73] (10.174.176.73) by dggema762-chm.china.huawei.com (10.1.198.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Fri, 8 Oct 2021 11:22:39 +0800 Subject: Re: [PATCH V2 5/5] blk-mq: support concurrent queue quiesce/unquiesce To: Ming Lei , Bart Van Assche CC: Jens Axboe , Christoph Hellwig , , , "Sagi Grimberg" , Keith Busch References: <20210930125621.1161726-1-ming.lei@redhat.com> <20210930125621.1161726-6-ming.lei@redhat.com> From: "yukuai (C)" Message-ID: <9fa25896-74e1-0d94-c39d-bf46f57472c4@huawei.com> Date: Fri, 8 Oct 2021 11:22:38 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="gbk"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.176.73] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggema762-chm.china.huawei.com (10.1.198.204) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 2021/10/05 10:31, Ming Lei wrote: > On Thu, Sep 30, 2021 at 08:56:29AM -0700, Bart Van Assche wrote: >> On 9/30/21 5:56 AM, Ming Lei wrote: >>> Turns out that blk_mq_freeze_queue() isn't stronger[1] than >>> blk_mq_quiesce_queue() because dispatch may still be in-progress after >>> queue is frozen, and in several cases, such as switching io scheduler, >>> updating nr_requests & wbt latency, we still need to quiesce queue as a >>> supplement of freezing queue. >> >> Is there agreement about this? If not, how about leaving out the above from the >> patch description? > > Yeah, actually the code has been merged, please see the related > functions: elevator_switch(), queue_wb_lat_store() and > blk_mq_update_nr_requests(). > >> >>> As we need to extend uses of blk_mq_quiesce_queue(), it is inevitable >>> for us to need support nested quiesce, especially we can't let >>> unquiesce happen when there is quiesce originated from other contexts. >>> >>> This patch introduces q->mq_quiesce_depth to deal concurrent quiesce, >>> and we only unquiesce queue when it is the last/outer-most one of all >>> contexts. >>> >>> One kernel panic issue has been reported[2] when running stress test on >>> dm-mpath's updating nr_requests and suspending queue, and the similar >>> issue should exist on almost all drivers which use quiesce/unquiesce. >>> >>> [1] https://marc.info/?l=linux-block&m=150993988115872&w=2 >>> [2] https://listman.redhat.com/archives/dm-devel/2021-September/msg00189.html >> >> Please share the call stack of the kernel oops fixed by [2] since that >> call stack is not in the patch description. > > OK, it is something like the following: > > [ 145.453672] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.12.0-2.fc30 04/01/2014 > [ 145.454104] RIP: 0010:dm_softirq_done+0x46/0x220 [dm_mod] > [ 145.454536] Code: 85 ed 0f 84 40 01 00 00 44 0f b6 b7 70 01 00 00 4c 8b a5 18 01 00 00 45 89 f5 f6 47 1d 04 75 57 49 8b 7c 24 08 48 85 ff 74 4d <48> 8b 47 08 48 8b 40 58 48 85 c0 74 40 49 8d 4c 24 50 44 89 f2 48 > [ 145.455423] RSP: 0000:ffffa88600003ef8 EFLAGS: 00010282 > [ 145.455865] RAX: ffffffffc03fbd10 RBX: ffff979144c00010 RCX: dead000000000200 > [ 145.456321] RDX: ffffa88600003f30 RSI: ffff979144c00068 RDI: ffffa88600d01040 > [ 145.456764] RBP: ffff979150eb7990 R08: ffff9791bbc27de0 R09: 0000000000000100 > [ 145.457205] R10: 0000000000000068 R11: 000000000000004c R12: ffff979144c00138 > [ 145.457647] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000010 > [ 145.458080] FS: 00007f57e5d13180(0000) GS:ffff9791bbc00000(0000) knlGS:0000000000000000 > [ 145.458516] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 145.458945] CR2: ffffa88600d01048 CR3: 0000000106cf8003 CR4: 0000000000370ef0 > [ 145.459382] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 145.459815] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 145.460250] Call Trace: > [ 145.460779] > [ 145.461453] blk_done_softirq+0xa1/0xd0 > [ 145.462138] __do_softirq+0xd7/0x2d6 > [ 145.462814] irq_exit+0xf7/0x100 > [ 145.463480] do_IRQ+0x7f/0xd0 > [ 145.464131] common_interrupt+0xf/0xf > [ 145.464797] Hi, out test can repoduce this problem: [ 139.158093] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 139.160285] #PF: supervisor read access in kernel mode [ 139.161905] #PF: error_code(0x0000) - not-present page [ 139.163513] PGD 172745067 P4D 172745067 PUD 17fa88067 PMD 0 [ 139.164506] Oops: 0000 [#1] PREEMPT SMP [ 139.165034] CPU: 17 PID: 1083 Comm: nbd-client Not tainted 5.15.0-rc4-next-20211007-dirty #94 [ 139.166179] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-p4 [ 139.167962] RIP: 0010:kyber_has_work+0x31/0xb0 [ 139.168571] Code: 41 bd 48 00 00 00 41 54 45 31 e4 55 53 48 8b 9f b0 00 00 00 48 8d 6b 08 49 63 c4 d [ 139.171039] RSP: 0018:ffffc90000f479c8 EFLAGS: 00010246 [ 139.171740] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888176218f40 [ 139.172680] RDX: ffffffffffffffff RSI: ffffc90000f479f4 RDI: ffff888175310000 [ 139.173611] RBP: 0000000000000008 R08: 0000000000000000 R09: ffff88882fa6c0a8 [ 139.174541] R10: 000000000000030e R11: ffff88817fbcfa10 R12: 0000000000000000 [ 139.175482] R13: 0000000000000048 R14: ffffffff99b7e340 R15: ffff8881783edc00 [ 139.176402] FS: 00007fa8e62e4b40(0000) GS:ffff88882fa40000(0000) knlGS:0000000000000000 [ 139.177434] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 139.178190] CR2: 0000000000000008 CR3: 00000001796ac000 CR4: 00000000000006e0 [ 139.179127] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 139.180066] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 139.181000] Call Trace: [ 139.182338] [ 139.182638] blk_mq_run_hw_queue+0x135/0x180 [ 139.183207] blk_mq_run_hw_queues+0x80/0x150 [ 139.183766] blk_mq_unquiesce_queue+0x33/0x40 [ 139.184329] nbd_clear_que+0x52/0xb0 [nbd] [ 139.184869] nbd_disconnect_and_put+0x6b/0xe0 [nbd] [ 139.185499] nbd_genl_disconnect+0x125/0x290 [nbd] [ 139.186123] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0 [ 139.186821] genl_rcv_msg+0xfc/0x2b0 [ 139.187300] ? nbd_ioctl+0x500/0x500 [nbd] [ 139.187847] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0 [ 139.188564] netlink_rcv_skb+0x62/0x180 [ 139.189075] genl_rcv+0x34/0x60 [ 139.189490] netlink_unicast+0x26d/0x590 [ 139.190006] netlink_sendmsg+0x3a1/0x6d0 [ 139.190513] ? netlink_rcv_skb+0x180/0x180 [ 139.191039] ____sys_sendmsg+0x1da/0x320 [ 139.191556] ? ____sys_recvmsg+0x130/0x220 [ 139.192095] ___sys_sendmsg+0x8e/0xf0 [ 139.192591] ? ___sys_recvmsg+0xa2/0xf0 [ 139.193102] ? __wake_up_common_lock+0xac/0xe0 [ 139.193699] __sys_sendmsg+0x6d/0xe0 [ 139.194167] __x64_sys_sendmsg+0x23/0x30 [ 139.194675] do_syscall_64+0x35/0x80 [ 139.195145] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 139.195806] RIP: 0033:0x7fa8e59ebb87 [ 139.196281] Code: 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 80 00 00 00 00 8b 05 6a 2b 2c 00 48 63 8 [ 139.198715] RSP: 002b:00007ffd50573c38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 139.199710] RAX: ffffffffffffffda RBX: 0000000001318120 RCX: 00007fa8e59ebb87 [ 139.200643] RDX: 0000000000000000 RSI: 00007ffd50573c70 RDI: 0000000000000003 [ 139.201583] RBP: 00000000013181f0 R08: 0000000000000014 R09: 0000000000000002 [ 139.202512] R10: 0000000000000006 R11: 0000000000000246 R12: 0000000001318030 [ 139.203434] R13: 00007ffd50573c70 R14: 0000000000000001 R15: 00000000ffffffff [ 139.204364] [ 139.204652] Modules linked in: nbd [ 139.205101] CR2: 0000000000000008 [ 139.205580] ---[ end trace 0248c57101a02431 ]--- hope the call stack can be helpful. Thanks, Kuai 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83502C433F5 for ; Fri, 8 Oct 2021 03:22:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1E35060FE3 for ; Fri, 8 Oct 2021 03:22:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1E35060FE3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:CC:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ckHQtn3kxDKA+dqgXfvrDwBbpQIE8k7LuUP2uZLGBsQ=; b=unm1K+KZEMuVQPLKmddC9UBt7e P08SWZ3S82jwc+we4ALDrWm2HR4ceynxI7x0pcWI67wR1sLJJdLlTwdXSTZnXVilGKQ3QIlPPft4r 1IufgwHzHjapfmfc7W8pIwkdwqaFe64L+nBOdb7JLM1opxbGbb276gslw84uUDGj8jq1g6iYhazgk E10to/uRN+wts8/TPXmD24Z/t45Hsg0k/p/xxsvTR9Ak3FvOAUuilonVKF9bhMKur+JD7Fs5Y11HJ sYixEMiBLcwXn7zbcg1ZLWH1ObIa8/icuur4EB7ZVs0o8aYCw7Vk7ELfJEiQcnl99JaUczvI5OIeV bLK2A7ZA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mYgTA-001QI0-52; Fri, 08 Oct 2021 03:22:48 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mYgT5-001QH1-V3 for linux-nvme@lists.infradead.org; Fri, 08 Oct 2021 03:22:46 +0000 Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.53]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4HQYPK3GXszWlTl; Fri, 8 Oct 2021 11:21:09 +0800 (CST) Received: from dggema762-chm.china.huawei.com (10.1.198.204) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2308.8; Fri, 8 Oct 2021 11:22:39 +0800 Received: from [10.174.176.73] (10.174.176.73) by dggema762-chm.china.huawei.com (10.1.198.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.8; Fri, 8 Oct 2021 11:22:39 +0800 Subject: Re: [PATCH V2 5/5] blk-mq: support concurrent queue quiesce/unquiesce To: Ming Lei , Bart Van Assche CC: Jens Axboe , Christoph Hellwig , , , "Sagi Grimberg" , Keith Busch References: <20210930125621.1161726-1-ming.lei@redhat.com> <20210930125621.1161726-6-ming.lei@redhat.com> From: "yukuai (C)" Message-ID: <9fa25896-74e1-0d94-c39d-bf46f57472c4@huawei.com> Date: Fri, 8 Oct 2021 11:22:38 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: X-Originating-IP: [10.174.176.73] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggema762-chm.china.huawei.com (10.1.198.204) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211007_202244_396928_5FCAD665 X-CRM114-Status: GOOD ( 19.38 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 2021/10/05 10:31, Ming Lei wrote: > On Thu, Sep 30, 2021 at 08:56:29AM -0700, Bart Van Assche wrote: >> On 9/30/21 5:56 AM, Ming Lei wrote: >>> Turns out that blk_mq_freeze_queue() isn't stronger[1] than >>> blk_mq_quiesce_queue() because dispatch may still be in-progress after >>> queue is frozen, and in several cases, such as switching io scheduler, >>> updating nr_requests & wbt latency, we still need to quiesce queue as a >>> supplement of freezing queue. >> >> Is there agreement about this? If not, how about leaving out the above from the >> patch description? > > Yeah, actually the code has been merged, please see the related > functions: elevator_switch(), queue_wb_lat_store() and > blk_mq_update_nr_requests(). > >> >>> As we need to extend uses of blk_mq_quiesce_queue(), it is inevitable >>> for us to need support nested quiesce, especially we can't let >>> unquiesce happen when there is quiesce originated from other contexts. >>> >>> This patch introduces q->mq_quiesce_depth to deal concurrent quiesce, >>> and we only unquiesce queue when it is the last/outer-most one of all >>> contexts. >>> >>> One kernel panic issue has been reported[2] when running stress test on >>> dm-mpath's updating nr_requests and suspending queue, and the similar >>> issue should exist on almost all drivers which use quiesce/unquiesce. >>> >>> [1] https://marc.info/?l=linux-block&m=150993988115872&w=2 >>> [2] https://listman.redhat.com/archives/dm-devel/2021-September/msg00189.html >> >> Please share the call stack of the kernel oops fixed by [2] since that >> call stack is not in the patch description. > > OK, it is something like the following: > > [ 145.453672] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.12.0-2.fc30 04/01/2014 > [ 145.454104] RIP: 0010:dm_softirq_done+0x46/0x220 [dm_mod] > [ 145.454536] Code: 85 ed 0f 84 40 01 00 00 44 0f b6 b7 70 01 00 00 4c 8b a5 18 01 00 00 45 89 f5 f6 47 1d 04 75 57 49 8b 7c 24 08 48 85 ff 74 4d <48> 8b 47 08 48 8b 40 58 48 85 c0 74 40 49 8d 4c 24 50 44 89 f2 48 > [ 145.455423] RSP: 0000:ffffa88600003ef8 EFLAGS: 00010282 > [ 145.455865] RAX: ffffffffc03fbd10 RBX: ffff979144c00010 RCX: dead000000000200 > [ 145.456321] RDX: ffffa88600003f30 RSI: ffff979144c00068 RDI: ffffa88600d01040 > [ 145.456764] RBP: ffff979150eb7990 R08: ffff9791bbc27de0 R09: 0000000000000100 > [ 145.457205] R10: 0000000000000068 R11: 000000000000004c R12: ffff979144c00138 > [ 145.457647] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000010 > [ 145.458080] FS: 00007f57e5d13180(0000) GS:ffff9791bbc00000(0000) knlGS:0000000000000000 > [ 145.458516] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 145.458945] CR2: ffffa88600d01048 CR3: 0000000106cf8003 CR4: 0000000000370ef0 > [ 145.459382] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 145.459815] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 145.460250] Call Trace: > [ 145.460779] > [ 145.461453] blk_done_softirq+0xa1/0xd0 > [ 145.462138] __do_softirq+0xd7/0x2d6 > [ 145.462814] irq_exit+0xf7/0x100 > [ 145.463480] do_IRQ+0x7f/0xd0 > [ 145.464131] common_interrupt+0xf/0xf > [ 145.464797] Hi, out test can repoduce this problem: [ 139.158093] BUG: kernel NULL pointer dereference, address: 0000000000000008 [ 139.160285] #PF: supervisor read access in kernel mode [ 139.161905] #PF: error_code(0x0000) - not-present page [ 139.163513] PGD 172745067 P4D 172745067 PUD 17fa88067 PMD 0 [ 139.164506] Oops: 0000 [#1] PREEMPT SMP [ 139.165034] CPU: 17 PID: 1083 Comm: nbd-client Not tainted 5.15.0-rc4-next-20211007-dirty #94 [ 139.166179] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190727_073836-buildvm-p4 [ 139.167962] RIP: 0010:kyber_has_work+0x31/0xb0 [ 139.168571] Code: 41 bd 48 00 00 00 41 54 45 31 e4 55 53 48 8b 9f b0 00 00 00 48 8d 6b 08 49 63 c4 d [ 139.171039] RSP: 0018:ffffc90000f479c8 EFLAGS: 00010246 [ 139.171740] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888176218f40 [ 139.172680] RDX: ffffffffffffffff RSI: ffffc90000f479f4 RDI: ffff888175310000 [ 139.173611] RBP: 0000000000000008 R08: 0000000000000000 R09: ffff88882fa6c0a8 [ 139.174541] R10: 000000000000030e R11: ffff88817fbcfa10 R12: 0000000000000000 [ 139.175482] R13: 0000000000000048 R14: ffffffff99b7e340 R15: ffff8881783edc00 [ 139.176402] FS: 00007fa8e62e4b40(0000) GS:ffff88882fa40000(0000) knlGS:0000000000000000 [ 139.177434] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 139.178190] CR2: 0000000000000008 CR3: 00000001796ac000 CR4: 00000000000006e0 [ 139.179127] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 139.180066] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 139.181000] Call Trace: [ 139.182338] [ 139.182638] blk_mq_run_hw_queue+0x135/0x180 [ 139.183207] blk_mq_run_hw_queues+0x80/0x150 [ 139.183766] blk_mq_unquiesce_queue+0x33/0x40 [ 139.184329] nbd_clear_que+0x52/0xb0 [nbd] [ 139.184869] nbd_disconnect_and_put+0x6b/0xe0 [nbd] [ 139.185499] nbd_genl_disconnect+0x125/0x290 [nbd] [ 139.186123] genl_family_rcv_msg_doit.isra.0+0x102/0x1b0 [ 139.186821] genl_rcv_msg+0xfc/0x2b0 [ 139.187300] ? nbd_ioctl+0x500/0x500 [nbd] [ 139.187847] ? genl_family_rcv_msg_doit.isra.0+0x1b0/0x1b0 [ 139.188564] netlink_rcv_skb+0x62/0x180 [ 139.189075] genl_rcv+0x34/0x60 [ 139.189490] netlink_unicast+0x26d/0x590 [ 139.190006] netlink_sendmsg+0x3a1/0x6d0 [ 139.190513] ? netlink_rcv_skb+0x180/0x180 [ 139.191039] ____sys_sendmsg+0x1da/0x320 [ 139.191556] ? ____sys_recvmsg+0x130/0x220 [ 139.192095] ___sys_sendmsg+0x8e/0xf0 [ 139.192591] ? ___sys_recvmsg+0xa2/0xf0 [ 139.193102] ? __wake_up_common_lock+0xac/0xe0 [ 139.193699] __sys_sendmsg+0x6d/0xe0 [ 139.194167] __x64_sys_sendmsg+0x23/0x30 [ 139.194675] do_syscall_64+0x35/0x80 [ 139.195145] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 139.195806] RIP: 0033:0x7fa8e59ebb87 [ 139.196281] Code: 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 80 00 00 00 00 8b 05 6a 2b 2c 00 48 63 8 [ 139.198715] RSP: 002b:00007ffd50573c38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 139.199710] RAX: ffffffffffffffda RBX: 0000000001318120 RCX: 00007fa8e59ebb87 [ 139.200643] RDX: 0000000000000000 RSI: 00007ffd50573c70 RDI: 0000000000000003 [ 139.201583] RBP: 00000000013181f0 R08: 0000000000000014 R09: 0000000000000002 [ 139.202512] R10: 0000000000000006 R11: 0000000000000246 R12: 0000000001318030 [ 139.203434] R13: 00007ffd50573c70 R14: 0000000000000001 R15: 00000000ffffffff [ 139.204364] [ 139.204652] Modules linked in: nbd [ 139.205101] CR2: 0000000000000008 [ 139.205580] ---[ end trace 0248c57101a02431 ]--- hope the call stack can be helpful. Thanks, Kuai _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme