linux-kernel - sunrpc: infinite unkillable console spam in xs_tcp_setup

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Date:   Mon, 20 Nov 2017 14:02:28 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Bruce Fields <bfields@...ldses.org>, jlayton@...nel.org,
        trond.myklebust@...marydata.com, anna.schumaker@...app.com,
        David Miller <davem@...emloft.net>, linux-nfs@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     syzkaller <syzkaller@...glegroups.com>
Subject: sunrpc: infinite unkillable console spam in xs_tcp_setup_socket

Hello,

The following program triggers infinite stream of the following output
on console. The program is unkillable and this effectively brings the
machine down:


** 16 printk messages dropped ** [12875.022917] xs_tcp_setup_socket:
connect returned unhandled error -113
** 17 printk messages dropped ** [12875.024832] xs_tcp_setup_socket:
connect returned unhandled error -113
** 17 printk messages dropped ** [12875.026765] xs_tcp_setup_socket:
connect returned unhandled error -113
** 17 printk messages dropped ** [12875.028729] xs_tcp_setup_socket:
connect returned unhandled error -113
** 17 printk messages dropped ** [12875.030648] xs_tcp_setup_socket:
connect returned unhandled error -113
** 15 printk messages dropped ** [12875.032360] xs_tcp_setup_socket:
connect returned unhandled error -113
** 16 printk messages dropped ** [12875.034197] xs_tcp_setup_socket:
connect returned unhandled error -113
** 16 printk messages dropped ** [12875.035988] xs_tcp_setup_socket:
connect returned unhandled error -113
** 15 printk messages dropped ** [12875.037718] xs_tcp_setup_socket:
connect returned unhandled error -113
** 16 printk messages dropped ** [12875.039553] xs_tcp_setup_socket:
connect returned unhandled error -113
** 16 printk messages dropped ** [12875.041392] xs_tcp_setup_socket:
connect returned unhandled error -113


Program:
https://gist.github.com/dvyukov/629543c9abc19576fec66ce8fae130c7

On upstream commit c8a0739b185d11d6e2ca7ad9f5835841d1cfc765 (Nov 19).
Config is attached.

Found by syzkaller fuzzer.

Thanks.

Download attachment ".config" of type "application/octet-stream" (125273 bytes)