rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=bd6c/1/0x4000000000000000 softirq=370196/370197 fqs=2
rcu: 	(detected by 0, t=10502 jiffies, g=428969, q=397 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13824 Comm: syz.8.30032 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:__lock_acquire+0x43c/0x2cf0
Code: 84 d6 01 00 00 41 8b 45 20 66 85 c0 0f 88 c9 01 00 00 4c 89 ed 0f b6 89 c5 00 00 00 84 c9 0f b6 d3 0f b6 c9 0f 44 ca 89 0c 24 <45> 8b a6 88 0b 00 00 41 8d 4c 24 ff 83 f9 ff 41 bd ff ff ff ff 44
RSP: 0018:ffffc90000a08b80 EFLAGS: 00000046
RAX: 00000000000c4000 RBX: 0000000000000002 RCX: 0000000000000002
RDX: 0000000000000002 RSI: 0000000000004000 RDI: 0000000000000000
RBP: ffff88816eca0be0 R08: ffffffff84bc171c R09: ffffffff9a7af2c0
R10: ffff888177249308 R11: ffffed102ee49263 R12: 0000000000000000
R13: ffff88816eca0be0 R14: ffff88816eca0000 R15: ffff88816eca0b90
FS:  00007efd4750a6c0(0000) GS:ffff8882a921b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006680 CR3: 000000001f68a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350
 _raw_spin_lock_irqsave+0x40/0x60
 debug_object_deactivate+0x6c/0x3a0
 __hrtimer_run_queues+0x23a/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:cpus_read_lock+0x8a/0x160
Code: 85 db 74 1b e8 d7 7d 23 00 89 c3 31 ff 89 c6 e8 6c 4f 3f 00 85 db 74 5c e8 23 4b 3f 00 eb 05 e8 1c 4b 3f 00 8b 1d a6 41 f8 0c <31> ff 89 de e8 4d 4f 3f 00 85 db 0f 85 8d 00 00 00 e8 00 4b 3f 00
RSP: 0018:ffffc9000519fc10 EFLAGS: 00000283
RAX: ffffffff8186744d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90009599000 RSI: 00000000000002d4 RDI: 00000000000002d5
RBP: ffffc9000519fd30 R08: ffffffff81b2459f R09: ffffffff8e7eb6d0
R10: dffffc0000000000 R11: fffffbfff2066cbf R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000017 R15: ffffc9000519fe60
 clock_was_set+0xaf/0x7d0
 do_settimeofday64+0x340/0x570
 __x64_sys_clock_settime+0x253/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd4659c819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efd4750a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007efd46815fa0 RCX: 00007efd4659c819
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007efd46632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd46816038 R14: 00007efd46815fa0 R15: 00007fffcb8fca18
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g428969 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: 8441 Comm: kworker/u9:13 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 fa fc 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 a5 f8 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 8a f8 0b
RSP: 0018:ffffc9000273f700 EFLAGS: 00000293
RAX: ffffffff81b9c6e6 RBX: ffff88812103c148 RCX: ffff888111609d80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000273f840 R08: ffffffff903365f7 R09: 1ffffffff2066cbe
R10: dffffc0000000000 R11: fffffbfff2066cbf R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ae53456b8 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>
