netdev - INFO: task hung in wg_noise_handshake_create

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Message-ID: <CAKcFiNC_=CecbLM6tzUajWt1AopWZciu53JTx_SufEqOR+X6LQ@mail.gmail.com>
Date:   Mon, 10 Jan 2022 21:58:24 +0800
From:   cruise k <cruise4k@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, wireguard@...ts.zx2c4.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     sunhao.th@...il.com
Subject: INFO: task hung in wg_noise_handshake_create_initiation

Hi,

Syzkaller found the following issue:

HEAD commit: 75acfdb Linux 5.16-rc8
git tree: upstream
console output: https://pastebin.com/raw/4aZeyEi8
kernel config: https://pastebin.com/raw/XsnKfdRt

And hope the report log can help you.

INFO: task kworker/u17:18:25859 blocked for more than 145 seconds.
      Not tainted 5.16.0-rc8+ #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u17:18  state:D stack:25232 pid:25859 ppid:     2 flags:0x00004000
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xcd9/0x2550 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0x664/0x1190 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write_common kernel/locking/rwsem.c:1265 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x135/0x150 kernel/locking/rwsem.c:1524
 wg_noise_handshake_create_initiation+0xb8/0x580
drivers/net/wireguard/noise.c:497
 wg_packet_send_handshake_initiation+0x187/0x340 drivers/net/wireguard/send.c:34
 wg_packet_handshake_send_worker+0x18/0x30 drivers/net/wireguard/send.c:51
 process_one_work+0x9df/0x16a0 kernel/workqueue.c:2298
 worker_thread+0x90/0xe20 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>