rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10504 jiffies, g=11625, q=2535 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10492 (4294956673-4294946181), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10491 jiffies! g11625 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=5016
rcu: rcu_preempt kthread starved for 10492 jiffies! g11625 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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:R stack:27224 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>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6407 Comm: syz.3.120 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:hrtimer_try_to_cancel+0x218/0x420
Code: 24 10 42 80 3c 30 00 74 08 4c 89 e7 e8 c1 97 75 00 4d 8b 2c 24 49 81 fd 40 db 15 8e 74 66 4c 89 eb 48 c1 eb 03 42 80 3c 33 00 <74> 08 4c 89 ef e8 9e 97 75 00 49 8b 7d 00 e8 85 3f cf 09 49 89 c7
RSP: 0018:ffffc900001e0928 EFLAGS: 00000046
RAX: 1ffff110220a4353 RBX: 1ffff11026cc4f60 RCX: ffff8880234dd640
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000004d306 R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffff888110521a98
R13: ffff888136627b00 R14: dffffc0000000000 R15: ffff888136627b00
FS:  00007f83be3f66c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c32c841 CR3: 0000000111d92000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:perf_trace_init+0xa2/0x2d0
Code: 60 d7 19 8e 0f 84 75 01 00 00 4c 89 24 24 4c 8d 63 30 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 17 01 00 00 4d 63 24 24 <4c> 89 ff 4c 89 e6 e8 e3 8b f6 ff 4d 39 e7 0f 85 a9 00 00 00 4c 8d
RSP: 0018:ffffc90002a6fa78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8f7c8b20 RCX: 0000000000080000
RDX: ffffc90027906000 RSI: 000000000000019c RDI: 000000000000019d
RBP: 0000000000000002 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: 0000000000001042
R13: 0000000000000000 R14: dffffc0000000000 R15: 00000000000000ec
 perf_tp_event_init+0x8d/0x120
 perf_try_init_event+0x17f/0x870
 perf_event_alloc+0x133e/0x2be0
 __se_sys_perf_event_open+0x772/0x1d70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83c018eba9
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:00007f83be3f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f83c03d5fa0 RCX: 00007f83c018eba9
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000040
RBP: 00007f83c0211e19 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83c03d6038 R14: 00007f83c03d5fa0 R15: 00007ffda1b92318
 </TASK>
