rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10506 jiffies, g=8205, q=971 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4294954662-4294944156), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g8205 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3652
rcu: rcu_preempt kthread starved for 10506 jiffies! g8205 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: 5932 Comm: syz.0.6 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+0x125/0x290
Code: 00 00 c7 44 24 40 00 00 00 00 48 89 df be 04 00 00 00 e8 7e 30 85 00 48 8d 7c 24 40 be 04 00 00 00 e8 6f 30 85 00 8b 44 24 40 <b9> 01 00 00 00 f0 0f b1 0b 0f 85 dd 00 00 00 65 8b 1d 69 bb 02 11
RSP: 0018:ffffc900001e07c0 EFLAGS: 00000097
RAX: 0000000000000000 RBX: ffff888136627a80 RCX: ffffffff819e14b1
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc900001e0800
RBP: ffffc900001e0870 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c100 R12: ffff888136627a90
R13: ffff888136627a88 R14: 1ffff11026cc4f52 R15: 1ffff11026cc4f51
FS:  00007fd1f0c766c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000110b3e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 _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+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:put_ctx+0x0/0x1e0
Code: ff eb 05 e8 22 81 d1 ff 5b 41 5e 41 5f 5d e9 d7 fb 8e 09 cc 66 0f 1f 44 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 89 fb 49 bf 00 00 00 00 00 fc ff df e8 e8 80
RSP: 0018:ffffc90003d1fbf8 EFLAGS: 00000246
RAX: 518b5cd75948ac00 RBX: ffff88811ffce800 RCX: 1ffff920007a3f64
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88811ffce800
RBP: ffffc90003d1fea8 R08: ffffc90003d1fb87 R09: 1ffff920007a3f70
R10: dffffc0000000000 R11: fffff520007a3f71 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff888110a49f40 R15: 0000000000000000
 perf_ioctl+0xdb2/0x1ec0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd1efd8eba9
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:00007fd1f0c76038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd1effd5fa0 RCX: 00007fd1efd8eba9
RDX: 0000000000000001 RSI: 0000000000002402 RDI: 0000000000000006
RBP: 00007fd1efe11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd1effd6038 R14: 00007fd1effd5fa0 R15: 00007ffdb26de978
 </TASK>
