rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=399521, q=2416 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 5198 (4295200585-4295195387), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 5198 jiffies! g399521 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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  running task     stack:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 315 Comm: kworker/R-bond3 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue:  0x0 (bond3)
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70
Code: 8b 3d a4 a0 60 0c 48 89 de 5b e9 33 ee 5f 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 88 70 73 11 65 8b 15 a9 70 73 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000006ac0 EFLAGS: 00000046
RAX: ffffffff81b2e11b RBX: ffffffff8e7bd5c0 RCX: ffff888113be3b00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000078b92 R08: ffffffff81b2dfc5 R09: ffffffff9a48d588
R10: 0000000000000003 R11: 0000000000000100 R12: 00000265469675ae
R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566fb64e8 CR3: 000000010c2da000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 ktime_get+0x19b/0x220
 clockevents_program_event+0x290/0x630
 __hrtimer_rearm_deferred+0x270/0x450
 irqentry_exit+0x6a0/0x730
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x1a1d/0x2550
Code: 85 6a 08 00 00 b3 01 8b 84 24 8c 00 00 00 41 39 06 4c 8b 7c 24 50 48 8b 7c 24 78 0f 85 54 01 00 00 48 8b 44 24 58 80 3c 28 00 <74> 05 e8 9c f9 b9 00 4d 8b 66 38 49 8d 7e 08 48 89 f8 48 c1 e8 03
RSP: 0018:ffffc90000006d18 EFLAGS: 00000246
RAX: 1ffff92000000dc4 RBX: ffffffff914bda01 RCX: 0000000000000001
RDX: ffffc90000006e28 RSI: dffffc0000000000 RDI: ffffc90000006e20
RBP: dffffc0000000000 R08: ffffc90000007cc8 R09: 0000000000000000
R10: ffffc90000006e38 R11: fffff52000000dc9 R12: ffffc90000007cc8
R13: 1ffff92000000dbf R14: ffffc90000006de8 R15: ffffffff8176f256
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x1d0/0x7d0
 synproxy_send_client_synack_ipv6+0x16f/0xcb0
 nft_synproxy_eval_v6+0x34a/0x4e0
 nft_synproxy_do_eval+0x3ce/0x580
 nft_do_chain+0x48d/0x1ae0
 nft_do_chain_inet+0x360/0x4b0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 ip6_input+0x16a/0x270
 NF_HOOK+0x336/0x3c0
 process_backlog+0x7dd/0x1950
 __napi_poll+0xae/0x340
 net_rx_action+0x627/0xf70
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 ad f5 f6 f5 f7 c3 00 02 00 00 74 05 e8 b0 8b 22 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 24 78 e8 f5 65 8b 05 ed d0 8d 07 85 c0 74 18 5b 41 5e e9 51 48
RSP: 0018:ffffc9000397f988 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000a02 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa6606 RDI: 0000000000000001
RBP: ffffc9000397fbb0 R08: ffffffff9030adf7 R09: 1ffffffff20615be
R10: dffffc0000000000 R11: fffffbfff20615bf R12: ffff888113be4570
R13: 1ffff9200072ff3c R14: ffff888113be4570 R15: 1ffff1102420779c
 __set_cpus_allowed_ptr_locked+0x7bb/0x19c0
 set_cpus_allowed_ptr+0x18f/0x1f0
 unbind_worker+0xf6/0x190
 rescuer_thread+0xcb4/0x1130
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
