netdev - Re: new kmemleak reports (was: Re: [PATCH 0/5] genetlink improvements)

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Date:   Tue, 1 Nov 2016 18:56:30 +0000
From:   Jakub Kicinski <kubakici@...pl>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Johannes Berg <johannes@...solutions.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Maciej Żenczykowski <zenczykowski@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: new kmemleak reports (was: Re: [PATCH 0/5] genetlink
 improvements)

On Tue, 1 Nov 2016 11:32:52 -0700, Cong Wang wrote:
> On Tue, Nov 1, 2016 at 10:28 AM, Jakub Kicinski <kubakici@...pl> wrote:
> > unreferenced object 0xffff8807389cba28 (size 128):
> >   comm "swapper/0", pid 1, jiffies 4294898463 (age 781.332s)
> >   hex dump (first 32 bytes):
> >     6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
> >     6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
> >   backtrace:
> >     [<ffffffff85decad8>] kmemleak_alloc+0x28/0x50
> >     [<ffffffff84771246>] __kmalloc+0x206/0x5a0
> >     [<ffffffff859e1261>] genl_register_family+0x711/0x11d0
> >     [<ffffffff888d9524>] netlbl_mgmt_genl_init+0x10/0x12
> >     [<ffffffff888d91e8>] netlbl_netlink_init+0x9/0x26
> >     [<ffffffff888d9254>] netlbl_init+0x4f/0x85
> >     [<ffffffff840022b7>] do_one_initcall+0xb7/0x2a0
> >     [<ffffffff887f9102>] kernel_init_freeable+0x597/0x636
> >     [<ffffffff85de7793>] kernel_init+0x13/0x140
> >     [<ffffffff85e0246a>] ret_from_fork+0x2a/0x40  
> 
> Looks like we are missing a kfree(family->attrbuf); on error path,
> but it is not related to Johannes' recent patches.
> 
> Could the attached patch help?
> 
> Thanks.

Still there:

unreferenced object 0xffff88073fb204e8 (size 64):
  comm "swapper/0", pid 1, jiffies 4294898455 (age 88.528s)
  hex dump (first 32 bytes):
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
  backtrace:
    [<ffffffff93decbf8>] kmemleak_alloc+0x28/0x50
    [<ffffffff92771246>] __kmalloc+0x206/0x5a0
    [<ffffffff939e1471>] genl_register_family+0x921/0x1270
    [<ffffffff968d0ecf>] genl_init+0x11/0x43
    [<ffffffff920022b7>] do_one_initcall+0xb7/0x2a0
    [<ffffffff967f9102>] kernel_init_freeable+0x597/0x636
    [<ffffffff93de78b3>] kernel_init+0x13/0x140
    [<ffffffff93e0256a>] ret_from_fork+0x2a/0x40
    [<ffffffffffffffff>] 0xffffffffffffffff

etc.

I'm getting this quite reliably on every boot.