From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BFFB2273FD for ; Wed, 16 Jul 2025 07:50:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752652246; cv=none; b=MntMb6BuHxdTA9OyCup1UKjj/sObJLmYhxPBuAAL4a4xNAUGvGM8+jvrnveTY14eVRrt/OJB9S185YH2Z8g+zBD/NZnjxkbuhXbGn9A0LThC04J5XRdBOxwEBHUAsUl0DBhIsYiFGjEiub6a3vwBWjebv6TXBsXyXGyahNumUAk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752652246; c=relaxed/simple; bh=XT3c1EClRI3RJFi4KbIc5DOd+vsIM5Zf9LzKqRipfQw=; h=Subject:To:Cc:References:From:Message-ID:Date:MIME-Version: In-Reply-To:Content-Type; b=iuIlb268Z9cUiRdYGHYcx4VTo9eoK8WC9tuy5qXKEJtfcbc70yghWhFVHILeYX/EUTRt017jsPDrPolFthmv3q4kH3Vp+Q1IXpqsyY3OlFzBXR7I6WuSWqSJToR4uDoQOc7DqSXTwL3BTPDYdxLlerl0I8yZknQQnszx3lS/nHQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4bhpBj34wnzKHN4J for ; Wed, 16 Jul 2025 15:50:37 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 080BE1A0CC3 for ; Wed, 16 Jul 2025 15:50:36 +0800 (CST) Received: from [10.174.179.143] (unknown [10.174.179.143]) by APP4 (Coremail) with SMTP id gCh0CgDnYhPKWXdoK9PAAQ--.2959S3; Wed, 16 Jul 2025 15:50:35 +0800 (CST) Subject: Re: [bug report] kmemleak issue observed during blktests To: Jens Axboe , Yi Zhang , linux-block Cc: Ming Lei , Shinichiro Kawasaki , "yukuai (C)" References: From: Yu Kuai Message-ID: <08f3f802-e3c3-b851-b4ee-912eade04c6f@huaweicloud.com> Date: Wed, 16 Jul 2025 15:50:34 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-CM-TRANSID:gCh0CgDnYhPKWXdoK9PAAQ--.2959S3 X-Coremail-Antispam: 1UD129KBjvdXoWruF4fGrWxJr4DCFyrZF15twb_yoWDtFc_ur W0vr18Kw4DJr15KF1qgFyrXr1UGF1xZF1UGaykJr1fAr4Ik3y7Zw4UuF1rWr1jq347AFWq 9r4UW3Z5X3yagjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbx8YFVCjjxCrM7AC8VAFwI0_Gr0_Xr1l1xkIjI8I6I8E6xAIw20E Y4v20xvaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwV A0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x02 67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I 0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40E x7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x 0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41lc7I2V7IY0VAS07AlzVAYIcxG8wCY1x0262kKe7AK xVWUAVWUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F4 0E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1l IxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxV AFwI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j 6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07UK2N tUUUUU= X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ Hi, 在 2025/07/16 9:54, Jens Axboe 写道: > unreferenced object 0xffff8882e7fbb000 (size 2048): > comm "check", pid 10460, jiffies 4324980514 > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace (crc c47e6a37): > __kvmalloc_node_noprof+0x55d/0x7a0 > sbitmap_init_node+0x15a/0x6a0 > kyber_init_hctx+0x316/0xb90 > blk_mq_init_sched+0x416/0x580 > elevator_switch+0x18b/0x630 > elv_update_nr_hw_queues+0x219/0x2c0 > __blk_mq_update_nr_hw_queues+0x36a/0x6f0 > blk_mq_update_nr_hw_queues+0x3a/0x60 > find_fallback+0x510/0x540 [nbd] This is werid, and I check the code that it's impossible blk_mq_update_nr_hw_queues() can be called from find_fallback(). Does kmemleak show wrong backtrace? Thanks, Kuai > nbd_send_cmd+0x24b/0x1480 [nbd] > configfs_write_iter+0x2ae/0x470 > vfs_write+0x524/0xe70 > ksys_write+0xff/0x200 > do_syscall_64+0x98/0x3c0 > entry_SYSCALL_64_after_hwframe+0x76/0x7e