RHEL9.2: tc_lock での smb2_reconnect スレッドのスピンに起因するソフトロックアップ

Issue

システムが、smb2_reconnect_server を実行しているワーカーから頻繁にソフトロックアップレポートを取得します。

[14115.807418] watchdog: BUG: soft lockup - CPU#3 stuck for 26s! [kworker/3:0:70557]
...
[14115.807915] CPU: 3 PID: 70557 Comm: kworker/3:0 Kdump: loaded Tainted: Gh ---- 5.14.0-284.11.1.el9_2.x86_64 #1
...
[14115.807921] Workqueue: cifsiod smb2_reconnect_server [cifs]
...
[14115.808490] Call Trace:
[14115.808491]  <TASK>
[14115.808492]  _raw_spin_lock+0x25/0x30
[14115.808497]  smb2_reconnect.part.0+0x3f/0x5f0 [cifs]
[14115.808623]  smb2_reconnect_server+0x203/0x5f0 [cifs]
[14115.808743]  process_one_work+0x1e5/0x3c0
[14115.808746]  ? rescuer_thread+0x3a0/0x3a0
[14115.808749]  worker_thread+0x50/0x3b0
[14115.808751]  ? rescuer_thread+0x3a0/0x3a0
[14115.808753]  kthread+0xd6/0x100
[14115.808756]  ? kthread_complete_and_exit+0x20/0x20
[14115.808758]  ret_from_fork+0x1f/0x30