rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=aa1c/1/0x4000000000000000 softirq=155161/155161 fqs=0
rcu: 	(detected by 0, t=10505 jiffies, g=148625, q=128 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 25298 Comm: syz.6.4600 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+0x6cf/0xd20
Code: 25 00 00 45 31 ff 85 c0 0f 84 f5 05 00 00 83 3d 36 b9 0e 18 00 75 13 48 63 44 24 20 48 0f a3 05 a7 29 0b 12 0f 83 15 05 00 00 <31> ed 48 8b 3c 24 4c 8b bf e0 0a 00 00 48 83 7c 24 28 00 75 1e 83
RSP: 0000:ffffc90003fff690 EFLAGS: 00000047
RAX: 0000000000000067 RBX: 0000000000000002 RCX: ffffffff9349f388
RDX: 0000000000000008 RSI: ffff88802111e130 RDI: ffff88802111d640
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88802111e130 R15: 0000000000000000
FS:  00007fcee866f6c0(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000119e72000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 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+0x3c5/0x550
 __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: 0033:0x7fcee765e866
Code: 53 48 83 ec 68 48 63 47 28 48 89 3c 24 48 8d 74 24 20 bf 01 00 00 00 89 44 24 10 48 c1 e0 07 48 01 d0 48 89 44 24 18 48 8b 18 <e8> 25 5b 12 00 85 c0 0f 85 5a 04 00 00 48 ba db 34 b6 d7 82 de 1b
RSP: 002b:00007fcee866f060 EFLAGS: 00000202
RAX: 00007fcee789f5e0 RBX: 00007fcee77f0338 RCX: 00007fcee778ec29
RDX: 00007fcee789ad60 RSI: 00007fcee866f080 RDI: 0000000000000001
RBP: 00007fcee79d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcee79d6038 R14: 00007ffd4b862850 R15: 00007ffd4b862938
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g148625 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=59609
rcu: rcu_preempt kthread starved for 10505 jiffies! g148625 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:26632 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>
