[BUG] kmemleak on __radix_tree_preload

Jaegeuk Kim
2014-04-25T01:47:51Z

Hi mm folks,

When I was testing recent linus tree, I got several kmemleaks as below.
Could any of you guys guide how to fix this?
Thanks,

0. Test
- fsstress on f2fs

1. Kernel version
commit 4d0fa8a0f01272d4de33704f20303dcecdb55df1
Merge: 39bfe90 b5539fa
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue Apr 22 09:28:02 2014 -0700

Merge tag 'gpio-v3.15-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull gpio fixes from Linus Walleij:

2. Bug
This is one of the results, but all the results indicate
__radix_tree_preload.

unreferenced object 0xffff88002ae2a238 (size 576):
comm "fsstress", pid 25019, jiffies 4295651360 (age 2276.104s)
hex dump (first 32 bytes):
01 00 00 00 81 ff ff ff 00 00 00 00 00 00 00 00 ................
40 7d 37 81 ff ff ff ff 50 a2 e2 2a 00 88 ff ff @}7.....P..*....
backtrace:
[<ffffffff8170e546>] kmemleak_alloc+0x26/0x50
[<ffffffff8119feac>] kmem_cache_alloc+0xdc/0x190
[<ffffffff81378709>] __radix_tree_preload+0x49/0xc0
[<ffffffff813787a1>] radix_tree_maybe_preload+0x21/0x30
[<ffffffff8114bbbc>] add_to_page_cache_lru+0x3c/0xc0
[<ffffffff8114c778>] grab_cache_page_write_begin+0x98/0xf0
[<ffffffffa02d3151>] f2fs_write_begin+0xa1/0x370 [f2fs]
[<ffffffff8114af47>] generic_perform_write+0xc7/0x1e0
[<ffffffff8114d230>] __generic_file_aio_write+0x1d0/0x400
[<ffffffff8114d4c0>] generic_file_aio_write+0x60/0xe0
[<ffffffff811b281a>] do_sync_write+0x5a/0x90
[<ffffffff811b3575>] vfs_write+0xc5/0x1f0
[<ffffffff811b3a92>] SyS_write+0x52/0xb0
[<ffffffff81730912>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff

--
Jaegeuk Kim
Samsung