netdev - kernel splat during boot

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Message-ID: <CAADnVQKdqYM-Kyy9vez04n1HQkiDs7Y-9rx2V7qNtwkDjrJ=SA@mail.gmail.com>
Date:   Thu, 18 Aug 2022 17:10:47 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kernel Team <Kernel-team@...com>, rcu@...r.kernel.org
Subject: kernel splat during boot

Hi Paul,

I see the following splat just booting net-next or bpf-next trees.
I have lockdep and kasan on (if that matters).
Is this a known issue?

[    3.011826] cblist_init_generic: Setting adjustable number of
callback queues.
[    3.011880]
[    3.011883] =============================
[    3.011885] [ BUG: Invalid wait context ]
[    3.011889] 5.19.0-14019-g75179e2b7f9a #4201 Not tainted
[    3.011893] -----------------------------
[    3.011896] swapper/0/1 is trying to lock:
[    3.011899] ffffffff85be94b8 (&port_lock_key){....}-{3:3}, at:
serial8250_console_write+0x5fc/0x640
[    3.011929] other info that might help us debug this:
[    3.011931] context-{5:5}
[    3.011934] 3 locks held by swapper/0/1:
[    3.011938]  #0: ffffffff8404dae0
(rcu_tasks_rude.cbs_gbl_lock){....}-{2:2}, at:
cblist_init_generic+0x27/0x340
[    3.011964]  #1: ffffffff84041d80 (console_lock){+.+.}-{0:0}, at:
vprintk_emit+0xda/0x2e0
[    3.011984]  #2: ffffffff839416e0 (console_owner){....}-{0:0}, at:
console_emit_next_record.constprop.37+0x1c9/0x4d0
[    3.012004] stack backtrace:
[    3.012007] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
5.19.0-14019-g75179e2b7f9a #4201
[    3.012011] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
[    3.012011] Call Trace:
[    3.012011]  <TASK>
[    3.012011]  dump_stack_lvl+0x44/0x57
[    3.012011]  __lock_acquire.cold.73+0xc7/0x31b
[    3.012011]  ? lockdep_hardirqs_on_prepare+0x1f0/0x1f0
[    3.012011]  ? rcu_read_lock_sched_held+0x91/0xc0
[    3.012011]  ? rcu_read_lock_bh_held+0xa0/0xa0
[    3.012011]  lock_acquire+0x133/0x380
[    3.012011]  ? serial8250_console_write+0x5fc/0x640
[    3.012011]  ? lock_release+0x3b0/0x3b0
[    3.012011]  _raw_spin_lock_irqsave+0x35/0x50
[    3.012011]  ? serial8250_console_write+0x5fc/0x640
[    3.012011]  serial8250_console_write+0x5fc/0x640
[    3.012011]  ? rcu_read_lock_bh_held+0xa0/0xa0
[    3.012011]  ? serial8250_default_handle_irq+0x80/0x80
[    3.012011]  ? lock_release+0x3b0/0x3b0
[    3.012011]  ? do_raw_spin_lock+0x107/0x1c0
[    3.012011]  ? rwlock_bug.part.2+0x60/0x60
[    3.012011]  ? prb_final_commit+0x50/0x50
[    3.012011]  console_emit_next_record.constprop.37+0x271/0x4d0
[    3.012011]  ? info_print_ext_header.constprop.38+0x110/0x110
[    3.012011]  ? rcu_read_lock_sched_held+0x91/0xc0
[    3.012011]  console_unlock+0x1d8/0x2c0
[    3.012011]  ? devkmsg_open+0x170/0x170
[    3.012011]  ? vprintk_emit+0xda/0x2e0
[    3.012011]  vprintk_emit+0xe3/0x2e0
[    3.012011]  _printk+0x96/0xb0
[    3.012011]  ? pm_suspend.cold.6+0x2e3/0x2e3
[    3.012011]  ? _raw_write_unlock+0x1f/0x30
[    3.012011]  ? do_raw_spin_lock+0x107/0x1c0
[    3.012011]  cblist_init_generic.cold.36+0x24/0x32
[    3.012011]  rcu_init_tasks_generic+0x23/0xf0
[    3.012011]  kernel_init_freeable+0x1d3/0x38a
[    3.012011]  ? _raw_spin_unlock_irq+0x24/0x30
[    3.012011]  ? rest_init+0x1d0/0x1d0
[    3.012011]  kernel_init+0x18/0x130
[    3.012011]  ? rest_init+0x1d0/0x1d0
[    3.012011]  ret_from_fork+0x1f/0x30
[    3.012011]  </TASK>
[    3.012029] cblist_init_generic: Setting shift to 3 and lim to 1.
[    3.013301] cblist_init_generic: Setting shift to 3 and lim to 1.
[    3.014203] Running RCU-tasks wait API self tests