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: 320ae51f (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>
parent
002acf1f
Please register or sign in to comment