linux-kernel - RCU stall in 8250 serial driver Linux 4.15-rc1

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Message-ID: <CAASgV=tHtf88=h-wtUrnoC74M6BEnNXcCg8d3DyWJfx21dnLYg@mail.gmail.com>
Date:   Wed, 17 Jan 2018 08:53:06 -0800
From:   Shankara Pailoor <sp3485@...umbia.edu>
To:     gregkh@...uxfoundation.org, jslaby@...e.com
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        linux-serial@...r.kernel.org
Subject: RCU stall in 8250 serial driver Linux 4.15-rc1

Hi,

Syzkaller found the following rcu stall report in Linux 4.15-rc1:
https://pastebin.com/NyZ9JdRv

The following C program reproduces it: https://pastebin.com/gqwDWWpA

Configs Here: https://pastebin.com/v6M3iKi1

Regards,
Shankara