linux-kernel - Re: [kmemleak] unreferenced object 0xcd9c1a80 (size 192):

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Message-ID: <CA+7wUswo-XwiMEcSTnB3HQE6qo2YUJxeSNije3KtFoy6CqzQoQ@mail.gmail.com>
Date:   Sun, 11 Feb 2018 20:18:34 +0100
From:   Mathieu Malaterre <malat@...ian.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        LKML <linux-kernel@...r.kernel.org>, Yonghong Song <yhs@...com>
Subject: Re: [kmemleak] unreferenced object 0xcd9c1a80 (size 192):

Hi,

On Sun, Feb 11, 2018 at 5:54 PM, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> On Sun, Feb 11, 2018 at 7:24 AM, Mathieu Malaterre <malat@...ian.org> wrote:
>> Alexei,
>>
>> Could you please comment on why I am seeing those memleaks being
>> reported on my ppc32 system ? Should they be marked as false positive
>> ?
>>
>> System is Mac Mini G4, git/master (4.15.0+), ppc.
>>
>> Thanks for your time
>>
>> $ dmesg
>> ...
>> [ 1281.504173] kmemleak: 36 new suspected memory leaks (see
>> /sys/kernel/debug/kmemleak)
>>
>> Where:
>>
>> # cat /sys/kernel/debug/kmemleak
>> unreferenced object 0xdee25000 (size 192):
>>   comm "systemd", pid 1, jiffies 4294894348 (age 1438.580s)
>>   hex dump (first 32 bytes):
>>     c0 56 2f 88 00 00 00 00 00 00 00 0b 00 00 00 0c  .V/.............
>>     00 00 00 08 00 00 00 01 00 00 00 01 00 00 00 01  ................
>>   backtrace:
>>     [<6c69baf5>] trie_alloc+0xb0/0x150
>>     [<fa093284>] SyS_bpf+0x288/0x1458
>>     [<82182f53>] ret_from_syscall+0x0/0x38
>> unreferenced object 0xdee25900 (size 192):
>>   comm "systemd", pid 1, jiffies 4294894540 (age 1437.812s)
>>   hex dump (first 32 bytes):
>>     c0 56 2f 88 00 00 00 00 00 00 00 0b 00 00 00 08  .V/.............
>>     00 00 00 08 00 00 00 01 00 00 00 01 00 00 00 01  ................
>>   backtrace:
>>     [<6c69baf5>] trie_alloc+0xb0/0x150
>>     [<fa093284>] SyS_bpf+0x288/0x1458
>>     [<82182f53>] ret_from_syscall+0x0/0x38
>
> hmm. looks real. Is there a reproducer?
> Yonghong, lpm map not cleaning after itself?

Not really. I simply boot up my machine and wait for the first kmemleak scan.