linux-kernel - [BUG] kmemleak on __radix_tree

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Date:	Fri, 25 Apr 2014 10:45:40 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	"Linux Kernel, Mailing List" <linux-kernel@...r.kernel.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: [BUG] kmemleak on __radix_tree_preload

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@...ux-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

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