rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=542c/1/0x4000000000000000 softirq=22098/22098 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=14161, q=271 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7825 Comm: syz.2.569 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:mark_lock+0xa3/0x190
Code: 90 ba 8d 48 c7 c6 5c de a9 8d e8 78 bc e5 ff 90 0f 0b 90 90 90 31 c9 4c 89 fe 4c 89 f7 b8 01 00 00 00 85 69 60 74 10 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 11 0c e0 09 cc 49 89 fe 49 89 f7 e8 35 b1
RSP: 0018:ffffc90000007728 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff9349f388
RDX: 0000000000000000 RSI: ffff88802278a7d8 RDI: ffff888022789cc0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88802278a7d8 R15: 0000000000000000
FS:  00007f5addbf66c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32b63fff CR3: 000000010e9d0000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_acquire+0x65a/0xd20
 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+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:wake_q_add_safe+0x35/0xe0
Code: 49 89 f7 48 89 fb 4c 8d b6 50 0a 00 00 4c 89 f7 be 08 00 00 00 e8 db 8d 93 00 b9 01 00 00 00 31 c0 f0 49 0f b1 8f 50 0a 00 00 <48> 85 c0 75 50 49 bc 00 00 00 00 00 fc ff df 48 83 c3 08 48 89 d8
RSP: 0018:ffffc90002acfbb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90002acfc80 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88810a8f43d0
RBP: ffffc90002acfcf0 R08: ffff88810a8f43d7 R09: 1ffff1102151e87a
R10: dffffc0000000000 R11: ffffed102151e87b R12: ffffc90002bdfad8
R13: ffff888039a14488 R14: ffff88810a8f43d0 R15: ffff88810a8f3980
 futex_wake+0x3bb/0x560
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5adf98ec29
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:00007f5addbf60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f5adfbd6098 RCX: 00007f5adf98ec29
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5adfbd609c
RBP: 00007f5adfbd6090 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5adfbd6128 R14: 00007ffd73cadb20 R15: 00007ffd73cadc08
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g14161 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=5063
rcu: rcu_preempt kthread starved for 10502 jiffies! g14161 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:27160 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>
