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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Thu, 28 Nov 2019 11:51:37 +0530
Message-ID: <CA+G9fYsuM-ALP_EtoFEzJiia26QnUvuKWsH0b-vi43Sp++es6A@mail.gmail.com>
Subject: Re: [PATCH 4.14 000/211] 4.14.157-stable review
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     open list <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Shuah Khan <shuah@kernel.org>, patches@kernelci.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        lkft-triage@lists.linaro.org,
        linux- stable <stable@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>, Tejun Heo <tj@kernel.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel@vger.kernel.org, Eric Dumazet <edumazet@google.com>,
        jouni.hogander@unikie.com, "David S. Miller" <davem@davemloft.net>,
        lukas.bulwahn@gmail.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Greg,

> Kernel BUG noticed on x86_64 device while booting 4.14.157-rc1 kernel.


The problematic patch is,
>> Jouni Hogander <jouni.hogander@unikie.com>
>>    net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject

And this kernel panic is been fixed by below patch,

commit 48a322b6f9965b2f1e4ce81af972f0e287b07ed0
Author: Eric Dumazet <edumazet@google.com>
Date:   Wed Nov 20 19:19:07 2019 -0800

    net-sysfs: fix netdev_queue_add_kobject() breakage

    kobject_put() should only be called in error path.

    Fixes: b8eb718348b8 ("net-sysfs: Fix reference count leak in
rx|netdev_queue_add_kobject")
    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Cc: Jouni Hogander <jouni.hogander@unikie.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>


> Regressions (compared to build v4.14.156)
>
> [    2.777657] BUG: unable to handle kernel NULL pointer dereference
> at 0000000000000090
> [    2.785487] IP: kernfs_find_ns+0x18/0xf0
> [    2.789408] PGD 0 P4D 0
> [    2.791941] Oops: 0000 [#1] SMP PTI
> [    2.795424] Modules linked in:
> [    2.798474] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.157-rc1 #1
> [    2.804906] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [    2.812288] task: ffff8e09ee250000 task.stack: ffffa0f900028000
> [    2.818200] RIP: 0010:kernfs_find_ns+0x18/0xf0

<trim>

> [    3.108995] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000009
> [    3.108995]
> [    3.118161] Kernel Offset: 0x1c400000 from 0xffffffff81000000
> (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
>
> Full test log,
> https://lkft.validation.linaro.org/scheduler/job/1026224#L793
>

--
Linaro LKFT
https://lkft.linaro.org