From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot <syzbot+ea7d9cb314b4ab49a18a@syzkaller.appspotmail.com>,
David Miller <davem@davemloft.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
LKML <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: INFO: rcu detected stall in ndisc_alloc_skb
Date: Thu, 3 Jan 2019 02:06:58 +0900 [thread overview]
Message-ID: <eeb95c52-5bf8-d3ce-d32b-269aa86bcd93@i-love.sakura.ne.jp> (raw)
In-Reply-To: <CACT4Y+YYwYDnqFmMwfSg6UNXnrbh46bo0jp7ijbej8nkDDmBXQ@mail.gmail.com>
On 2018/12/31 17:24, Dmitry Vyukov wrote:
>>> Since this involves OOMs and looks like a one-off induced memory corruption:
>>>
>>> #syz dup: kernel panic: corrupted stack end in wb_workfn
>>>
>>
>> Why?
>>
>> RCU stall in this case is likely to be latency caused by flooding of printk().
>
> Just a hypothesis. OOMs lead to arbitrary memory corruptions, so can
> cause stalls as well. But can be what you said too. I just thought
> that cleaner dashboard is more useful than a large assorted pile of
> crashes. If you think it's actionable in some way, feel free to undup.
>
We don't know why bpf tree is hitting this problem.
Let's continue monitoring this problem.
#syz undup
next prev parent reply other threads:[~2019-01-02 17:07 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <0000000000007beca9057e4c8c14@google.com>
2018-12-31 7:49 ` Dmitry Vyukov
2018-12-31 7:49 ` Dmitry Vyukov
2018-12-31 8:17 ` Tetsuo Handa
2018-12-31 8:24 ` Dmitry Vyukov
2018-12-31 8:24 ` Dmitry Vyukov
2019-01-02 17:06 ` Tetsuo Handa [this message]
2019-01-05 10:49 ` Tetsuo Handa
2019-01-06 13:24 ` Dmitry Vyukov
2019-01-06 13:24 ` Dmitry Vyukov
2019-01-06 13:47 ` Tetsuo Handa
2019-01-07 11:12 ` Dmitry Vyukov
2019-01-07 11:12 ` Dmitry Vyukov
2019-01-18 5:20 ` Tetsuo Handa
2019-01-19 12:16 ` Dmitry Vyukov
2019-01-19 12:16 ` Dmitry Vyukov
2019-01-19 13:10 ` Tetsuo Handa
2019-01-20 13:30 ` Dmitry Vyukov
2019-01-20 13:30 ` Dmitry Vyukov
2019-01-20 14:24 ` Tetsuo Handa
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