rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=a3fc/1/0x4000000000000000 softirq=53595/53595 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=36909, q=648 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11130 Comm: syz.7.1416 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:do_raw_spin_lock+0x112/0x290
Code: 00 00 41 8b 45 00 65 8b 0d af 9d 02 11 39 c8 0f 84 f3 00 00 00 c7 44 24 40 00 00 00 00 48 89 df be 04 00 00 00 e8 9e 21 85 00 <48> 8d 7c 24 40 be 04 00 00 00 e8 8f 21 85 00 8b 44 24 40 b9 01 00
RSP: 0000:ffffc9000291f700 EFLAGS: 00000056
RAX: 00000000ffffff01 RBX: ffff88804b027a80 RCX: ffffffff819e12a2
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88804b027a80
RBP: ffffc9000291f7b0 R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffff88804b027a90
R13: ffff88804b027a88 R14: 1ffff11009604f52 R15: 1ffff11009604f51
FS:  000055556b671500(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d810ff8 CR3: 0000000113f9c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 _raw_spin_lock_irqsave+0xb3/0xf0
 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: 0033:0x7f59033c14e5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007fff452fb2f0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 00007f59035d5fa0 RCX: 00007f59033c14e5
RDX: 00007fff452fb330 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f59035d7da0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000003ac95
R13: 00007f59035d6180 R14: ffffffffffffffff R15: 00007fff452fb470
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g36909 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=13144
rcu: rcu_preempt kthread starved for 10502 jiffies! g36909 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>
