rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=17505, q=516 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294959614-4294949114), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g17505 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7530
rcu: rcu_preempt kthread starved for 10500 jiffies! g17505 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: 7531 Comm: syz.0.453 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:__lock_acquire+0x324/0xd20
Code: c1 e6 14 41 09 d6 8b 54 24 10 c1 e2 13 c1 e5 15 09 d5 09 cd 44 09 f5 41 89 6c c7 20 45 89 44 c7 24 4c 89 7c 24 10 4d 8d 34 c7 <81> e5 ff 1f 00 00 48 0f a3 2d 3e ff 0a 12 73 10 48 69 c5 c8 00 00
RSP: 0018:ffffc900001e0750 EFLAGS: 00000002
RAX: 000000000000000f RBX: ffff888136627a98 RCX: 0000000000000067
RDX: 0000000000080000 RSI: 0000000000004000 RDI: ffff88810db3b980
RBP: 00000000000c4067 R08: 0000000000000000 R09: ffffffff81ada58b
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: 0000000000004000
R13: 0000000000000000 R14: ffff88810db3c4e8 R15: ffff88810db3c470
FS:  00007f82fb4786c0(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a22464440 CR3: 000000010934c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:init_file+0x65/0x2f0
Code: 42 0f b6 04 28 84 c0 0f 85 87 02 00 00 41 c7 87 a8 00 00 00 00 00 00 00 4c 89 ff be 08 00 00 00 e8 10 c9 ee ff f0 49 83 07 01 <eb> 05 e8 c4 53 8b ff 4c 8d 63 70 4c 89 e5 48 c1 ed 03 42 80 7c 2d
RSP: 0018:ffffc900045f7b78 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffff888106611800 RCX: ffffffff82346b30
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88810611d200
RBP: 0000000000000002 R08: ffff88810611d207 R09: 1ffff11020c23a40
R10: dffffc0000000000 R11: ffffed1020c23a41 R12: ffff88810db3c230
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88810611d200
 alloc_empty_file+0x6e/0x1d0
 alloc_file_pseudo+0x13d/0x210
 anon_inode_getfile+0xc5/0x1a0
 __se_sys_perf_event_open+0xf20/0x1d70
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f82fa58ec29
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:00007f82fb478038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f82fa7d5fa0 RCX: 00007f82fa58ec29
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0
RBP: 00007f82fa611e41 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f82fa7d6038 R14: 00007f82fa7d5fa0 R15: 00007ffd4e2ef2b8
 </TASK>
