linux-kernel - INFO: task hung in devtmpfs_submit

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Date:   Tue, 11 Jan 2022 10:41:06 +0800
From:   cruise k <cruise4k@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Cc:     sunhao.th@...il.com
Subject: INFO: task hung in devtmpfs_submit_req

Hi,

Syzkaller found the following issue:

HEAD commit: 75acfdb Linux 5.16-rc8
git tree: upstream
console output: https://pastebin.com/raw/gwHBn2EB
kernel config: https://pastebin.com/raw/XsnKfdRt

And hope the report log can help you.

INFO: task kworker/6:4:13959 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/6:4     state:D stack:26944 pid:13959 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __schedule+0xcd9/0x2550
 schedule+0xd2/0x260
 schedule_timeout+0x5e5/0x890
 wait_for_completion+0x17b/0x280
 devtmpfs_submit_req+0xa8/0x100
 devtmpfs_delete_node+0xe1/0x150
 device_del+0xadf/0xe80
 usb_disconnect+0x4a4/0x8c0
 hub_event+0x199c/0x4090
 process_one_work+0x9df/0x16a0
 worker_thread+0x90/0xe20
 kthread+0x405/0x4f0
 ret_from_fork+0x1f/0x30
 </TASK>