rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=44393, q=103 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4295001186-4294990688), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g44393 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=34704
rcu: rcu_preempt kthread starved for 10498 jiffies! g44393 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: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>
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: 14069 Comm: syz.7.2157 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:__cant_sleep+0x83/0x210
Code: f1 00 f2 f2 f2 4b 89 04 3c 66 43 c7 44 3c 09 f3 f3 43 c6 44 3c 0b f3 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 f6 44 24 41 02 <74> 56 65 8b 05 14 14 0f 11 25 ff ff ff 7f 39 d0 7f 46 48 c7 c0 00
RSP: 0018:ffffc900001e0500 EFLAGS: 00000046
RAX: f2f2f200f1f1f1f1 RBX: 0000000000000002 RCX: ffff888109591cc0
RDX: 0000000000000000 RSI: 0000000000000072 RDI: ffffffff8b906040
RBP: ffffc900001e05b0 R08: 0000000000000001 R09: ffff888136632ad0
R10: 61625f72656d6974 R11: 6b636f6c2e736573 R12: 1ffff9200003c0a0
R13: 1ffff9200003c0c4 R14: ffff888136632ad0 R15: dffffc0000000000
FS:  00007f37b3a0e6c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010a238000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 trace_call_bpf+0x89/0x850
 perf_trace_run_bpf_submit+0x78/0x170
 perf_trace_lock+0x2f8/0x3b0
 lock_release+0x3b2/0x3e0
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_try_to_cancel+0x3be/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:_raw_spin_unlock_irq+0x29/0x50
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 1a 91 20 f6 48 89 df e8 72 28 21 f6 e8 0d 7b 4a f6 fb bf 01 00 00 00 <e8> 42 20 13 f6 65 8b 05 cb e0 23 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0018:ffffc9000f41fbb8 EFLAGS: 00000286
RAX: 8b4cec010875e300 RBX: ffff88811c4e1800 RCX: 8b4cec010875e300
RDX: 0000000000000006 RSI: ffffffff8d9ba186 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: ffff888112b0a628
R13: dffffc0000000000 R14: ffff88811c4e1800 R15: 1ffff110225614c5
 _perf_event_refresh+0x107/0x250
 perf_ioctl+0x5e5/0x1ec0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37b2b8eba9
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:00007f37b3a0e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f37b2dd5fa0 RCX: 00007f37b2b8eba9
RDX: 0000000000000002 RSI: 0000000000002402 RDI: 0000000000000005
RBP: 00007f37b2c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f37b2dd6038 R14: 00007f37b2dd5fa0 R15: 00007ffd8391b948
 </TASK>
