rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=cd0c/1/0x4000000000000000 softirq=113368/113371 fqs=0
rcu: 	(detected by 0, t=10505 jiffies, g=101169, q=303 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 20352 Comm: syz.3.3642 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__lock_acquire+0x705/0xd20
Code: 00 48 83 7c 24 28 00 75 1e 83 3d 45 1b 2f 18 00 0f 95 c0 49 83 ff ff 0f 94 c1 08 c1 bd 01 00 00 00 0f 84 1d 05 00 00 4d 89 3e <8b> 9f 28 0b 00 00 48 85 db 0f 84 81 00 00 00 83 fb 31 0f 83 e0 05
RSP: 0000:ffffc9000395f690 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff936ae401
RDX: 0000000000000008 RSI: ffff88802b64e230 RDI: ffff88802b64d700
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ae2efb
R10: dffffc0000000000 R11: ffffed1026cc4f59 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88802b64e230 R15: ffffffffffffffff
FS:  00007f306b9a16c0(0000) GS:ffff8881a3a03000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d419ff8 CR3: 000000003bd46000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3b8/0x500
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f306aa5edcb
Code: 45 0c 85 c0 75 35 48 8d 75 0c b9 40 42 0f 00 ba 81 00 00 00 c7 45 0c 01 00 00 00 bf ca 00 00 00 31 c0 45 31 e4 e8 45 fe 12 00 <eb> 8c 0f 1f 00 31 d2 4c 89 ef e8 06 fe fe ff eb bc 48 8d 3d 05 44
RSP: 002b:00007f306b9a10f0 EFLAGS: 00000207
RAX: 0000000000000001 RBX: 00007f306add5fa8 RCX: 00007f306ab8ec29
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f306add5fac
RBP: 00007f306add5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f306add6038 R14: 00007ffe02bbe240 R15: 00007ffe02bbe328
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g101169 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:27184 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 1091 Comm: kworker/u9:5 Not tainted syzkaller #0 PREEMPT(full) 
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+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 26 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 d1 6e 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 b5 6e
RSP: 0018:ffffc90006bff640 EFLAGS: 00000293
RAX: ffffffff81b4e79b RBX: 1ffff11026cc7ffd RCX: ffff888023fd9d00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006bff7c0 R08: ffffffff8fc34277 R09: 1ffffffff1f8684e
R10: dffffc0000000000 R11: fffffbfff1f8684f R12: ffff88813663ffe8
R13: dffffc0000000000 R14: ffff88804b03b200 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8403000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff3f8337fc8 CR3: 000000000e138000 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+0x5f9/0x1130
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x250
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xad/0x240
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
