From 1cb048f596cc7b4405d695d65ca70098a7ab9065 Mon Sep 17 00:00:00 2001 From: Filipe David Borba Manana Date: Tue, 20 Aug 2013 00:52:51 +0100 Subject: [PATCH] Btrfs: fix memory leak of orphan block rsv This issue is simple to reproduce and observe if kmemleak is enabled. Two simple ways to reproduce it: ** 1 $ mkfs.btrfs -f /dev/loop0 $ mount /dev/loop0 /mnt/btrfs $ btrfs balance start /mnt/btrfs $ umount /mnt/btrfs ** 2 $ mkfs.btrfs -f /dev/loop0 $ mount /dev/loop0 /mnt/btrfs $ touch /mnt/btrfs/foobar $ rm -f /mnt/btrfs/foobar $ umount /mnt/btrfs After a while, kmemleak reports the leak: $ cat /sys/kernel/debug/kmemleak unreferenced object 0xffff880402b13e00 (size 128): comm "btrfs", pid 19621, jiffies 4341648183 (age 70057.844s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 fc c6 b1 04 88 ff ff 04 00 04 00 ad 4e ad de .............N.. backtrace: [] kmemleak_alloc+0x26/0x50 [] kmem_cache_alloc_trace+0xeb/0x1d0 [] btrfs_alloc_block_rsv+0x39/0x70 [btrfs] [] btrfs_orphan_add+0x13d/0x1b0 [btrfs] [] btrfs_remove_block_group+0x143/0x500 [btrfs] [] btrfs_relocate_chunk.isra.63+0x618/0x790 [btrfs] [] btrfs_balance+0x8f7/0xe90 [btrfs] [] btrfs_ioctl_balance+0x250/0x550 [btrfs] [] btrfs_ioctl+0xdfa/0x25f0 [btrfs] [] do_vfs_ioctl+0x96/0x570 [] SyS_ioctl+0x91/0xb0 [] system_call_fastpath+0x16/0x1b [] 0xffffffffffffffff This affects btrfs-next, revision be8e3cd00d7293dd177e3f8a4a1645ce09ca3acb (Btrfs: separate out tests into their own directory). Signed-off-by: Filipe David Borba Manana Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- Reading git-format-patch failed