From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750865Ab3LFFLA (ORCPT ); Fri, 6 Dec 2013 00:11:00 -0500 Received: from mailhub.sw.ru ([195.214.232.25]:47611 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750735Ab3LFFK7 (ORCPT ); Fri, 6 Dec 2013 00:10:59 -0500 From: Andrey Vagin To: linux-kernel@vger.kernel.org Cc: Andrey Vagin , Jens Axboe Subject: [PATCH] block: fix memory leaks on unplugging block device Date: Fri, 6 Dec 2013 09:06:41 +0400 Message-Id: <1386306401-17405-1-git-send-email-avagin@openvz.org> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All objects, which are allocated in blk_mq_register_disk, must be released in blk_mq_unregister_disk. I use a KVM virtual machine and virtio disk to reproduce this issue. kmemleak: 18 new suspected memory leaks (see /sys/kernel/debug/kmemleak) $ cat /sys/kernel/debug/kmemleak | head -n 30 unreferenced object 0xffff8800b6636150 (size 8): comm "kworker/0:2", pid 65, jiffies 4294809903 (age 86.358s) hex dump (first 8 bytes): 76 69 72 74 69 6f 34 00 virtio4. backtrace: [] kmemleak_alloc+0x4e/0xb0 [] __kmalloc_track_caller+0xf5/0x260 [] kstrdup+0x31/0x60 [] sysfs_new_dirent+0x2e/0x140 [] create_dir+0x38/0xe0 [] sysfs_create_dir_ns+0x73/0xc0 [] kobject_add_internal+0xc9/0x340 [] kobject_add+0x65/0xb0 [] device_add+0x128/0x660 [] device_register+0x1a/0x20 [] register_virtio_device+0x98/0xe0 [] virtio_pci_probe+0x12e/0x1c0 [] local_pci_probe+0x45/0xa0 [] pci_device_probe+0x121/0x130 [] driver_probe_device+0x87/0x390 [] __device_attach+0x3b/0x40 unreferenced object 0xffff8800b65aa1d8 (size 144): Fixes: 320ae51feed5 (blk-mq: new multi-queue block IO queueing mechanism) Cc: Jens Axboe Signed-off-by: Andrey Vagin --- block/blk-mq-sysfs.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index ba6cf8e..b91ce75 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -335,9 +335,22 @@ static struct kobj_type blk_mq_hw_ktype = { void blk_mq_unregister_disk(struct gendisk *disk) { struct request_queue *q = disk->queue; + struct blk_mq_hw_ctx *hctx; + struct blk_mq_ctx *ctx; + int i, j; + + queue_for_each_hw_ctx(q, hctx, i) { + hctx_for_each_ctx(hctx, ctx, j) { + kobject_del(&ctx->kobj); + kobject_put(&ctx->kobj); + } + kobject_del(&hctx->kobj); + kobject_put(&hctx->kobj); + } kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); + kobject_put(&q->mq_kobj); kobject_put(&disk_to_dev(disk)->kobj); } -- 1.8.3.1