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From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Dmitry Vyukov <dvyukov@google.com>,
	syzbot <syzbot+ea7d9cb314b4ab49a18a@syzkaller.appspotmail.com>
Cc: 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: Mon, 31 Dec 2018 17:17:17 +0900	[thread overview]
Message-ID: <ef2508c9-d069-2143-09a6-a90b9ef12568@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <CACT4Y+Yx4BJw=F_PMx9a8AjPKzEwhzLnzt9K-dgkBoNkKQj2+g@mail.gmail.com>

On 2018/12/31 16:49, Dmitry Vyukov wrote:
> On Mon, Dec 31, 2018 at 8:42 AM syzbot
> <syzbot+ea7d9cb314b4ab49a18a@syzkaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    ef4ab8447aa2 selftests: bpf: install script with_addr.sh
>> git tree:       bpf-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=14a28b6e400000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=7e7e2279c0020d5f
>> dashboard link: https://syzkaller.appspot.com/bug?extid=ea7d9cb314b4ab49a18a
>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>>
>> Unfortunately, I don't have any reproducer for this crash yet.
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+ea7d9cb314b4ab49a18a@syzkaller.appspotmail.com
> 
> 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().

  reply	other threads:[~2018-12-31  8:18 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-31  7:42 syzbot
2018-12-31  7:49 ` Dmitry Vyukov
2018-12-31  7:49   ` Dmitry Vyukov
2018-12-31  8:17   ` Tetsuo Handa [this message]
2018-12-31  8:24     ` Dmitry Vyukov
2018-12-31  8:24       ` Dmitry Vyukov
2019-01-02 17:06       ` Tetsuo Handa
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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