rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=7c2c/1/0x4000000000000000 softirq=125477/125478 fqs=1
rcu: 	(detected by 0, t=10506 jiffies, g=135609, q=916 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 23493 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:taprio_set_budgets+0x69/0x3b0
Code: 9b 78 f8 4d 8b 24 24 49 83 c4 40 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 17 9b 78 f8 <4d> 8b 24 24 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80
RSP: 0018:ffffc90000a08aa8 EFLAGS: 00000046
RAX: 1ffff11037506e08 RBX: ffff8881ba837280 RCX: dffffc0000000000
RDX: 0000000000010100 RSI: ffff8881934d5c00 RDI: ffff8881ba837280
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141154 R12: ffff8881ba837040
R13: ffff8881ba837280 R14: ffff8881934d5c00 R15: ffff8881934d5000
FS:  0000555572506500(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f228d74da08 CR3: 000000002032a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 advance_sched+0x922/0xc20
 __hrtimer_run_queues+0x3c0/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__rcu_read_lock+0x0/0x60
Code: 3f fc ff ff 4c 89 ff e8 ce 82 85 00 e9 32 fc ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 53 65 48 8b 1d ab a3 8d 11 48 81 c3 c4 04 00 00 48 89
RSP: 0018:ffffc90000a08ec8 EFLAGS: 00000206
RAX: 000000000001969c RBX: 1ffff110478c7947 RCX: 0000000080000100
RDX: 0000000000000002 RSI: ffffffff8dfaa160 RDI: ffffffff8c28ade0
RBP: 0000000000000001 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: ffff88823c63ca40
R13: 0000000000000002 R14: ffff88823c63ca38 R15: ffff8881ba837000
 net_tx_action+0x5af/0xc30
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:fib_table_flush+0x4a8/0x1300
Code: 00 00 00 48 8b 44 24 60 48 8d 58 40 48 89 d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 48 89 84 24 80 00 00 00 42 0f b6 04 38 <84> c0 0f 85 83 08 00 00 48 89 5c 24 40 8b 1b 89 de 83 e6 01 31 ff
RSP: 0018:ffffc9000477f1e0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff888170fe6440 RCX: 0000000000000000
RDX: ffff8881126ebb00 RSI: 00000000000000ff RDI: 00000000000000ff
RBP: ffffc9000477f3d0 R08: ffffffff8225b04f R09: ffff88823c646080
R10: dffffc0000000000 R11: fffffbfff20616df R12: 0000000000000004
R13: ffff88816ad4bde0 R14: ffff888114b96420 R15: dffffc0000000000
 fib_disable_ip+0xfd/0x170
 fib_netdev_event+0x318/0x490
 notifier_call_chain+0x1ad/0x3d0
 netif_close_many+0x2ae/0x420
 unregister_netdevice_many_notify+0x825/0x22c0
 unregister_netdevice_queue+0x31f/0x360
 nsim_destroy+0x277/0x7f0
 __nsim_dev_port_del+0x14f/0x200
 nsim_dev_reload_destroy+0x288/0x490
 nsim_drv_remove+0x58/0x170
 device_release_driver_internal+0x46f/0x870
 bus_remove_device+0x455/0x570
 device_del+0x527/0x8f0
 device_unregister+0x21/0xf0
 del_device_store+0x2b0/0x370
 kernfs_fop_write_iter+0x3af/0x540
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f10ee15d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffe4cea8468 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555572506500 RCX: 00007f10ee15d60e
RDX: 0000000000000001 RSI: 00007ffe4cea84f0 RDI: 0000000000000005
RBP: 00007f10ee2335ec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe4cea84f0 R14: 00007f10eef44620 R15: 0000000000000003
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g135609 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 1213 Comm: kworker/u9:9 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0xfcf/0x13d0
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 da 07 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 85 03 0c 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 6a 03 0c
RSP: 0018:ffffc90007927700 EFLAGS: 00000293
RAX: ffffffff81b9bc06 RBX: ffff88812103c148 RCX: ffff88810be4bb00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007927840 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc42c28019c CR3: 000000000e74a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f5/0x1160
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
