rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=41405, q=2440 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294974506-4294964006), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g41405 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=18526
rcu: rcu_preempt kthread starved for 10500 jiffies! g41405 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: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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11784 Comm: syz.3.1592 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:validate_chain+0x11/0x2140
Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 81 ec e0 00 00 00 <49> 89 cf 65 48 8b 05 04 2a 03 11 48 89 84 24 d8 00 00 00 8b 46 20
RSP: 0018:ffffc90000007638 EFLAGS: 00000082
RAX: ffffffff9349f388 RBX: 0000000000000000 RCX: d6bf87c490213bdc
RDX: 0000000000000001 RSI: ffff88802023a7b0 RDI: ffff888020239cc0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000068
R13: ffff88802023a7b0 R14: ffff88802023a7b0 R15: d6bf87c490213bdc
FS:  00007f56418b36c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000028cd6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_acquire+0xab9/0xd20
 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:__mutex_unlock_slowpath+0x6a5/0x740
Code: 48 8d bc 24 88 00 00 00 e8 c8 85 a7 f6 48 89 9c 24 88 00 00 00 bf 01 00 00 00 e8 76 e0 13 f6 65 8b 05 ff b0 24 07 85 c0 74 55 <48> c7 44 24 40 0e 36 e0 45 48 b8 00 00 00 00 00 fc ff df 48 8b 4c
RSP: 0018:ffffc900060efae0 EFLAGS: 00000246
RAX: ffff888020239cc0 RBX: 1ffffffff1f47c6c RCX: ffffffff8b7c2a31
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc900060efb80
RBP: ffffc900060efbf0 R08: ffffc900060efb87 R09: 1ffff92000c1df70
R10: dffffc0000000000 R11: fffff52000c1df71 R12: ffffc900060efb80
R13: 0000000000000000 R14: 1ffffffff3358664 R15: ffff888119623840
 perf_ioctl+0xdaa/0x1ec0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f564098eba9
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:00007f56418b3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5640bd5fa0 RCX: 00007f564098eba9
RDX: 0000000000000008 RSI: 0000000000002402 RDI: 0000000000000005
RBP: 00007f5640a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5640bd6038 R14: 00007f5640bd5fa0 R15: 00007ffef3c34098
 </TASK>
