rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (12 ticks this GP) idle=63d4/1/0x4000000000000000 softirq=24969/24970 fqs=6
rcu: 	(detected by 0, t=10503 jiffies, g=20353, q=1173 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8181 Comm: syz.1.591 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+0x7/0x420
Code: c4 fe ff ff 66 66 66 66 66 66 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 f3 0f 1e fa 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 30 48 89 fb 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc900001de4f8 EFLAGS: 00000006
RAX: ffffffff81ada9e1 RBX: ffff888023125f28 RCX: ffff8880230c3980
RDX: 0000000000010100 RSI: 0000000000000004 RDI: ffff888023125f28
RBP: 00000000ffffffff R08: ffff888136627a83 R09: 1ffff11026cc4f50
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffff888023125fd0
R13: dffffc0000000000 R14: ffff888023125f28 R15: fffffffffffefe36
FS:  00007f2d0644b6c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d0644afc8 CR3: 0000000027bd0000 CR4: 00000000000006f0
DR0: 0000200000000300 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+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x130e/0x2390
Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49
RSP: 0018:ffffc900001dec58 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff90118ea8 RCX: dffffc0000000000
RDX: ffffffff90118ea8 RSI: ffffffff90ba9f16 RDI: ffffffff8be33ba0
RBP: ffffffff90118ea8 R08: 0000000000000001 R09: ffffffff8172d195
R10: ffffc900001ded78 R11: ffffffff81ac4b00 R12: ffffffff8962e6bd
R13: ffffffff90118ea8 R14: ffffc900001ded28 R15: ffffffff90118ea8
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 skb_clone+0x212/0x3a0
 dev_queue_xmit_nit+0x416/0xcc0
 dev_hard_start_xmit+0x1be/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x1857/0x3b50
 ip_finish_output2+0xd03/0x1160
 ip_output+0x29f/0x450
 __ip_queue_xmit+0x118d/0x1c30
 __tcp_transmit_skb+0x24f6/0x3aa0
 tcp_write_xmit+0x19c1/0x69a0
 __tcp_push_pending_frames+0x97/0x360
 tcp_rcv_established+0x1522/0x2670
 tcp_v4_do_rcv+0xa23/0xce0
 tcp_v4_rcv+0x252a/0x2dc0
 ip_protocol_deliver_rcu+0x221/0x440
 ip_local_deliver_finish+0x3bb/0x6f0
 NF_HOOK+0x30c/0x3a0
 ip_sublist_rcv_finish+0x221/0x2a0
 ip_sublist_rcv+0x74c/0xa10
 ip_list_rcv+0x3e2/0x430
 __netif_receive_skb_list_core+0x7d2/0x800
 netif_receive_skb_list_internal+0x96f/0xcb0
 gro_receive_skb+0x642/0xce0
 e1000_clean_rx_irq+0x980/0x1170
 e1000_clean+0xca4/0x2b00
 __napi_poll+0xc7/0x360
 net_rx_action+0x707/0xe30
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 ab f8 13 f6 e8 16 55 4b f6 fb bf 01 00 00 00 <e8> 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90004ab7620 EFLAGS: 00000282
RAX: 3a3a7888befdf300 RBX: 0000000000000000 RCX: 3a3a7888befdf300
RDX: 0000000000000006 RSI: ffffffff8d9b9fb4 RDI: 0000000000000001
RBP: ffffc90004ab76c0 R08: ffffffff8fa38f37 R09: 1ffffffff1f471e6
R10: dffffc0000000000 R11: fffffbfff1f471e7 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000956ec4
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:kcm_sendmsg+0x1fb/0x2ad0
Code: 00 00 e8 38 fb 78 f7 48 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 80 3c 30 00 74 08 48 89 df e8 a8 f8 78 f7 48 8b 1b <48> 89 de 48 81 e6 00 00 01 00 31 ff e8 54 88 15 f7 48 81 e3 00 00
RSP: 0018:ffffc90004ab7780 EFLAGS: 00000246
RAX: 1ffff11023ae000c RBX: 0000000000000100 RCX: ffffffff8aaa3b58
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811d700060
RBP: ffffc90004ab79d0 R08: ffff88811d700067 R09: 1ffff11023ae000c
R10: dffffc0000000000 R11: ffffed1023ae000d R12: ffffffff8aaa3980
R13: ffff88811d700000 R14: dffffc0000000000 R15: ffff888114603000
 __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: 0033:0x7f2d0558eba9
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:00007f2d0644b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2d057d6090 RCX: 00007f2d0558eba9
RDX: 0000000000000000 RSI: 0000200000002080 RDI: 0000000000000004
RBP: 00007f2d05611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2d057d6128 R14: 00007f2d057d6090 R15: 00007ffc3b856488
 </TASK>
rcu: rcu_preempt kthread starved for 10485 jiffies! g20353 f0x0 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:26664 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:
CPU: 0 UID: 0 PID: 28 Comm: kworker/u9:1 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
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 e5 5e
RSP: 0018:ffffc9000061f660 EFLAGS: 00000293
RAX: ffffffff81b4601b RBX: 1ffff11026cc7f69 RCX: ffff88801c6f1cc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000061f7e0 R08: ffffffff8fa38f37 R09: 1ffffffff1f471e6
R10: dffffc0000000000 R11: fffffbfff1f471e7 R12: ffff88813663fb48
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f253ed91ba8 CR3: 000000000df36000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f9/0x1130
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x250
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xad/0x240
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
