rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=3e64/1/0x4000000000000000 softirq=32594/32594 fqs=0
rcu: 	(detected by 1, t=10506 jiffies, g=24601, q=84 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9991 Comm: syz.0.1207 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:check_preemption_disabled+0x0/0x120
Code: c7 20 42 e3 8b 48 c7 c6 60 42 e3 8b eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 53 48 83 ec 10 65 48 8b 05 be fe 25 07 48 89 44 24
RSP: 0018:ffffc90000007810 EFLAGS: 00000046
RAX: 9582619a6cddded0 RBX: 0000000000000087 RCX: 67643edfcd5d7900
RDX: 0000000000000001 RSI: ffffffff8dbaa0c3 RDI: ffffffff8be34280
RBP: ffff88802efd0b18 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: 0000000000000001
R13: 0000000000000001 R14: ffff88804b027a98 R15: ffff88802efd0000
FS:  00007f2b7a4d46c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012c1ae000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_release+0x27a/0x3e0
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 1a 21 20 f6 48 89 df e8 72 b8 20 f6 e8 6d 0b 4a f6 fb bf 01 00 00 00 <e8> 42 b0 12 f6 65 8b 05 cb 80 23 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0018:ffffc90004e3fbb8 EFLAGS: 00000286
RAX: 67643edfcd5d7900 RBX: ffff88802e28d000 RCX: 67643edfcd5d7900
RDX: 0000000000000006 RSI: ffffffff8d9baa25 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff8fa3b237 R09: 1ffffffff1f47646
R10: dffffc0000000000 R11: fffffbfff1f47647 R12: ffff888036ed7768
R13: dffffc0000000000 R14: ffff88802e28d000 R15: 1ffff11006ddaeed
 _perf_event_refresh+0x107/0x250
 perf_ioctl+0x5e5/0x1ec0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b7958ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b7a4d4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2b797d5fa0 RCX: 00007f2b7958ec29
RDX: 0000000000000002 RSI: 0000000000002402 RDI: 000000000000000a
RBP: 00007f2b79611e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2b797d6038 R14: 00007f2b797d5fa0 R15: 00007ffcc465a518
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g24601 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=13523
rcu: rcu_preempt kthread starved for 10506 jiffies! g24601 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26568 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
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+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
