rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=24529, q=348 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294964644-4294954142), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g24529 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=10994
rcu: rcu_preempt kthread starved for 10502 jiffies! g24529 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: 9236 Comm: syz.1.928 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:hrtimer_try_to_cancel+0x65/0x420
Code: 24 10 48 89 0c 24 48 c1 e9 03 48 89 4c 24 28 48 89 5c 24 08 eb 0a e8 4a 1b 12 00 48 8b 5c 24 08 48 8b 44 24 10 42 80 3c 30 00 <74> 08 48 89 df e8 d1 8d 75 00 4c 8b 3b 49 8d 5f 10 49 89 dc 49 c1
RSP: 0018:ffffc90000007928 EFLAGS: 00000046
RAX: 1ffff1100767d8cb RBX: ffff88803b3ec658 RCX: 1ffff1100767d8cc
RDX: 0000000000010000 RSI: 0000000000000004 RDI: ffff88803b3ec628
RBP: 00000000ffffffff R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffff88803b3ec6d0
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffffffffff6039
FS:  00007f07cfbe86c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 0000000108248000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:netlink_rcv_skb+0xbe/0x470
Code: 0f 85 aa 03 00 00 41 8b 5d 00 bf 10 00 00 00 89 de e8 56 4b 1e f8 83 fb 0f 77 0a e8 0c 47 1e f8 e9 44 03 00 00 48 8d 7c 24 60 <ba> 80 00 00 00 31 f6 e8 66 bc 81 f8 48 8b 44 24 08 48 8d 98 d8 00
RSP: 0018:ffffc900079d7220 EFLAGS: 00000212
RAX: ffffffff89a177ea RBX: 0000000000000054 RCX: 0000000000000002
RDX: ffff88811de03980 RSI: 0000000000000054 RDI: ffffc900079d7280
RBP: ffffc900079d7370 R08: ffff8881000120fb R09: 1ffff1102000241f
R10: dffffc0000000000 R11: ffffed1020002420 R12: 1ffff1100502700e
R13: ffff888028138070 R14: dffffc0000000000 R15: dffffc0000000000
 nfnetlink_rcv+0x26a/0x2520
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f07ced8ec29
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:00007f07cfbe8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f07cefd5fa0 RCX: 00007f07ced8ec29
RDX: 0000000000000080 RSI: 00002000000002c0 RDI: 0000000000000009
RBP: 00007f07cee11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f07cefd6038 R14: 00007f07cefd5fa0 R15: 00007ffe4ad0ac58
 </TASK>
