rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=26633, q=68 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294965966-4294955464), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g26633 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=11627
rcu: rcu_preempt kthread starved for 10502 jiffies! g26633 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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:R 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>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9803 Comm: syz.1.1117 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+0x285/0xd20
Code: 8b 4c 24 70 4c 8d bf f0 0a 00 00 41 83 fd 31 48 89 74 24 20 0f 83 5e 0a 00 00 4c 89 6c 24 28 4a 8d 04 ad 00 00 00 00 4c 01 e8 <89> f1 81 e1 ff 1f 00 00 ba 00 e0 ff ff 41 23 54 c7 20 09 ca 41 89
RSP: 0018:ffffc90000007750 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88804b027a98 RCX: ffffffff93497310
RDX: 0000000000000000 RSI: 0000000000000067 RDI: ffff88810857d640
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81ada58b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810857e130
FS:  0000555581882500(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4c828b6fc8 CR3: 000000003fab8000 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:__free_object+0x9a/0x6d0
Code: 09 f3 f3 48 89 4c 24 38 42 c6 44 29 0b f3 48 c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 48 8b 9c 24 80 00 00 00 <fa> f7 c3 00 02 00 00 74 05 e8 28 a3 f6 fc 48 89 5c 24 30 0f 1f 44
RSP: 0018:ffffc90002affb80 EFLAGS: 00000a06
RAX: f2f2f200f1f1f1f1 RBX: 0000000000000a06 RCX: 1ffff9200055ff78
RDX: 0000000000000000 RSI: ffffffff8d9b9cae RDI: ffff8881072ef658
RBP: ffffc90002affc70 R08: ffffffff8fa3a637 R09: 1ffffffff1f474c6
R10: dffffc0000000000 R11: fffffbfff1f474c7 R12: 1ffff11020e5decc
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff8881072ef658
 debug_object_free+0x2a2/0x340
 hrtimer_nanosleep+0x2a6/0x360
 __se_sys_clock_nanosleep+0x2f1/0x380
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c819c14e5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffecd31f730 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f4c81bd5fa0 RCX: 00007f4c819c14e5
RDX: 00007ffecd31f770 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f4c81bd7da0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000002ce99
R13: 00007f4c81bd6180 R14: ffffffffffffffff R15: 00007ffecd31f8b0
 </TASK>
