From: David Ahern <dsahern@gmail.com>
To: Yonghong Song <yhs@fb.com>, netdev <netdev@vger.kernel.org>,
Alexei Starovoitov <ast@fb.com>, Martin Lau <kafai@fb.com>,
Dave Jones <dsj@fb.com>
Subject: Re: oops with ip6_rt_cache_alloc
Date: Fri, 24 Aug 2018 17:04:28 -0600 [thread overview]
Message-ID: <2314c9c2-27ab-c470-5e8a-4e28e53810b2@gmail.com> (raw)
In-Reply-To: <5d3d7d56-ce9f-79c3-04ec-122a2451b580@fb.com>
On 8/24/18 4:26 PM, Yonghong Song wrote:
> Hi,
>
> We got a kernel oops with the following stack trace:
>
> CPU: 24 PID: 0 Comm: swapper/24 Not tainted
> 4.16.0-10_fbk1_1183_g7e4ee4c8171c #10
> "Hardware name: Quanta Leopard-DDR3/Leopard-DDR3, BIOS F06_3A16.DDR3
> 11/19/2015"
> RIP: 0010:ip6_rt_get_dev_rcu+0x6/0x60
> RSP: 0018:ffff88046fb03c78 EFLAGS: 00010286
> RAX: 0000000040000003 RBX: ffff88035a6c1500 RCX: ffffffff81ec5dc0
> RDX: ffff88033192a090 RSI: ffff88033192a0a0 RDI: 0000000000000000
RDI = 0 means the rt passed to ip6_rt_get_dev_rcu is NULL. I believe
that can't happen prior to the fib6_info changes. After the fib6_info
changes, it means the 'from' is NULL and that is not expected.
...
> Our internal experiments showed that an early version of 4.16 works fine
> and after backporting some ipv6 route related changes and the above
> problem showed up.
Can you run the test on 4.18?
next prev parent reply other threads:[~2018-08-25 2:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-24 22:26 oops with ip6_rt_cache_alloc Yonghong Song
2018-08-24 23:04 ` David Ahern [this message]
2018-08-27 4:57 ` Yonghong Song
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