rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=13853, q=379 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294958677-4294948175), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g13853 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=5491
rcu: rcu_preempt kthread starved for 10502 jiffies! g13853 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:26792 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: 6485 Comm: syz.3.146 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:__sanitizer_cov_trace_const_cmp1+0x20/0x90
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 14 25 08 d0 a0 92 65 8b 0d 18 0c e1 10 81 e1 00 01 ff 00 74 11 <81> f9 00 01 00 00 75 5b 83 ba 3c 16 00 00 00 74 52 8b 8a 18 16 00
RSP: 0018:ffffc900001e0920 EFLAGS: 00000006
RAX: ffffffff81ada62c RBX: ffff888136627b10 RCX: 0000000000010000
RDX: ffff888025f49cc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000006c70e R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: 1ffff11026cc4f62
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888136627b00
FS:  00007f363d2046c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc48318208 CR3: 0000000034458000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 hrtimer_try_to_cancel+0xcc/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:trace_sched_exit_tp+0x2f/0x110
Code: 8b 05 59 a0 0f 11 83 f8 08 73 3b 89 c3 c1 e8 06 48 8d 3c c5 30 a9 a3 8f be 08 00 00 00 e8 09 13 92 00 48 0f a3 1d 31 79 12 0e <73> 12 e8 ea 41 15 00 84 c0 75 09 80 3d 67 5d fc 0d 00 74 0e 5b 5d
RSP: 0018:ffffc90002fbf248 EFLAGS: 00000257
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81912ff7
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fa3a930
RBP: ffffc90002fbf470 R08: ffffffff8fa3a937 R09: 1ffffffff1f47526
R10: dffffc0000000000 R11: fffffbfff1f47527 R12: dffffc0000000000
R13: 1ffff11009607557 R14: ffff888025f49cc0 R15: ffff88802120158c
 __schedule+0x17ae/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 rtnetlink_rcv_msg+0x71c/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f363c38eba9
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:00007f363d204038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f363c5d5fa0 RCX: 00007f363c38eba9
RDX: 000000000000fe33 RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007f363c411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f363c5d6038 R14: 00007f363c5d5fa0 R15: 00007ffcf432a608
 </TASK>
