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| author | Andrey Vagin <avagin@openvz.org> | 2013-12-06 09:06:41 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-12-06 09:18:02 -0700 |
| commit | 8515736604941334bd9e8fc01edea685a228acd5 (patch) | |
| tree | 530b759a6574bcee1b3177ceee17c9ef8ec76141 /block | |
| parent | 002acf1fc16cf60e60345bd68e03734628505b83 (diff) | |
| download | linux-8515736604941334bd9e8fc01edea685a228acd5.tar.gz linux-8515736604941334bd9e8fc01edea685a228acd5.tar.bz2 linux-8515736604941334bd9e8fc01edea685a228acd5.zip | |
block: fix memory leaks on unplugging block device
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:
[<ffffffff8165d41e>] kmemleak_alloc+0x4e/0xb0
[<ffffffff8118cfc5>] __kmalloc_track_caller+0xf5/0x260
[<ffffffff81155b11>] kstrdup+0x31/0x60
[<ffffffff812242be>] sysfs_new_dirent+0x2e/0x140
[<ffffffff81224678>] create_dir+0x38/0xe0
[<ffffffff812249e3>] sysfs_create_dir_ns+0x73/0xc0
[<ffffffff8130dfa9>] kobject_add_internal+0xc9/0x340
[<ffffffff8130e535>] kobject_add+0x65/0xb0
[<ffffffff813f34f8>] device_add+0x128/0x660
[<ffffffff813f3a4a>] device_register+0x1a/0x20
[<ffffffff813ae6f8>] register_virtio_device+0x98/0xe0
[<ffffffff813b0cce>] virtio_pci_probe+0x12e/0x1c0
[<ffffffff81340675>] local_pci_probe+0x45/0xa0
[<ffffffff81341a51>] pci_device_probe+0x121/0x130
[<ffffffff813f67f7>] driver_probe_device+0x87/0x390
[<ffffffff813f6b3b>] __device_attach+0x3b/0x40
unreferenced object 0xffff8800b65aa1d8 (size 144):
Fixes: 320ae51feed5 (blk-mq: new multi-queue block IO queueing mechanism)
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq-sysfs.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index ba6cf8e9aa0a..b91ce75bd35d 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); } |