rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=16ac/1/0x4000000000000000 softirq=62219/62219 fqs=0
rcu: 	(detected by 1, t=10506 jiffies, g=53345, q=219 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12652 Comm: syz.1.1634 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+0x238/0x420
Code: eb 48 c1 eb 03 42 80 3c 33 00 74 08 4c 89 ef e8 ce 97 75 00 49 8b 7d 00 e8 c5 43 cf 09 49 89 c7 48 8b 44 24 10 42 80 3c 30 00 <74> 08 4c 89 e7 e8 ae 97 75 00 49 8b 2c 24 49 39 ed 74 33 e8 b0 19
RSP: 0018:ffffc90000007928 EFLAGS: 00000046
RAX: 1ffff11005a91993 RBX: 1ffff11009604f60 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007800
RBP: 0000000000ab7afe R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: ffff88802d48cc98
R13: ffff88804b027b00 R14: dffffc0000000000 R15: 0000000000000802
FS:  00007f167af6d6c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30029f CR3: 0000000026a70000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 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:__futex_unqueue+0x6d/0x160
Code: cb 00 00 00 4c 8d 63 18 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 e7 e8 20 27 70 00 49 8b 04 24 4c 39 e0 0f 84 b0 00 00 00 <48> c7 c0 60 d9 a3 8f 48 c1 e8 03 49 89 ec 0f b6 04 28 84 c0 0f 85
RSP: 0018:ffffc90007107b70 EFLAGS: 00000283
RAX: ffff88802dd2a788 RBX: ffffc9000736faa0 RCX: 0000000000080000
RDX: ffffc90028dbb000 RSI: 00000000000003b0 RDI: 00000000000003b1
RBP: dffffc0000000000 R08: ffff8881080b9ceb R09: 1ffff1102101739d
R10: dffffc0000000000 R11: ffffed102101739e R12: ffffc9000736fab8
R13: ffffc9000736fad0 R14: 1ffff92000e6df5a R15: ffff88802dd2a748
 futex_wake_mark+0xe2/0x200
 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: 0033:0x7f167a18eba9
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:00007f167af6d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f167a3d5fa8 RCX: 00007f167a18eba9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f167a3d5fac
RBP: 00007f167a3d5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f167a3d6038 R14: 00007ffc88314370 R15: 00007ffc88314458
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g53345 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=22190
rcu: rcu_preempt kthread starved for 10506 jiffies! g53345 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:26728 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>
