cgroup: Unknown subsys name 'perf_event'
cgroup: Unknown subsys name 'net_cls'
------------[ cut here ]------------
WARNING: CPU: 0 PID: 449 at kernel/kthread.c:83 to_kthread kernel/kthread.c:83 [inline]
WARNING: CPU: 0 PID: 449 at kernel/kthread.c:83 kthread_is_per_cpu+0xc4/0xf0 kernel/kthread.c:519
Modules linked in:
CPU: 0 PID: 449 Comm: kworker/u4:6 Not tainted 5.10.52 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events_unbound io_ring_exit_work
RIP: 0010:to_kthread kernel/kthread.c:83 [inline]
RIP: 0010:kthread_is_per_cpu+0xc4/0xf0 kernel/kthread.c:519
Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 2e 4c 8b 23 41 83 e4 01 e8 c9 8d 23 00 44 89 e0 5b 5d 41 5c c3 e8 bc 8d 23 00 <0f> 0b eb 88 e8 33 c6 4e 00 e9 68 ff ff ff e8 39 c6 4e 00 eb 9a 48
RSP: 0018:ffff888042d7f5c0 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff88805cfe3280 RCX: ffffffff811bf6fc
RDX: ffff88800e48e500 RSI: ffffffff811bf774 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000001 R09: ffff88805cfe3280
R10: 0000000000000000 R11: ffffffff85dd301b R12: ffff88805cfe3328
R13: ffff888042d7f748 R14: ffff888042d7f748 R15: ffff88805cfe3280
FS:  0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde7674dc8 CR3: 00000000382a0000 CR4: 0000000000350ef0
Call Trace:
 can_migrate_task+0x90/0xa00 kernel/sched/fair.c:7572
 detach_tasks kernel/sched/fair.c:7720 [inline]
 load_balance+0xa0e/0x2990 kernel/sched/fair.c:9644
 newidle_balance+0x6b9/0xee0 kernel/sched/fair.c:10616
 pick_next_task_fair+0x48/0xb10 kernel/sched/fair.c:7159
 pick_next_task kernel/sched/core.c:4342 [inline]
 __schedule+0x330/0x1e80 kernel/sched/core.c:4493
 schedule+0xcb/0x270 kernel/sched/core.c:4603
 schedule_timeout+0x192/0x3f0 kernel/time/timer.c:1871
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion_timeout+0x163/0x280 kernel/sched/completion.c:157
 io_ring_exit_work+0xe4/0x920 fs/io_uring.c:8523
 process_one_work+0x9a9/0x1590 kernel/workqueue.c:2270
 worker_thread+0x61d/0x1310 kernel/workqueue.c:2416
 kthread+0x38f/0x470 kernel/kthread.c:292
 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:296
irq event stamp: 545818
hardirqs last  enabled at (545817): [<ffffffff83c5d424>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (545817): [<ffffffff83c5d424>] _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:191
hardirqs last disabled at (545818): [<ffffffff83c4d9d2>] __schedule+0xfb2/0x1e80 kernel/sched/core.c:4425
softirqs last  enabled at (529062): [<ffffffff83e00f92>] asm_call_irq_on_stack+0x12/0x20
softirqs last disabled at (529041): [<ffffffff83e00f92>] asm_call_irq_on_stack+0x12/0x20
---[ end trace 6d6b3933bbdc41b1 ]---

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