linux-kernel - Re: INFO: rcu detected stall in sctp_generate_heartbeat

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Date:   Sat, 26 May 2018 17:36:02 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     syzbot <syzbot+e4a5bbd54260c93014f9@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>, linux-sctp@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        Neil Horman <nhorman@...driver.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Vladislav Yasevich <vyasevich@...il.com>
Subject: Re: INFO: rcu detected stall in sctp_generate_heartbeat_event

On Tue, May 8, 2018 at 2:06 PM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
> On Tue, May 08, 2018 at 12:35:02AM -0700, syzbot wrote:
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    90278871d4b0 Merge git://git.kernel.org/pub/scm/linux/kern..
>> git tree:       net-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=119a7237800000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=aea320d3af5ef99d
>> dashboard link: https://syzkaller.appspot.com/bug?extid=e4a5bbd54260c93014f9
>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>>
>> Unfortunately, I don't have any reproducer for this crash yet.
>
> A reproducer will be welcomed. With just these traces, I don't think
> we have enough information.


#syz fix: sctp: not allow to set rto_min with a value below 200 msecs