rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=ea6/1/0x4000000000000004 softirq=12339/12344 fqs=5217 
	(t=10500 jiffies g=6081 q=1792)
NMI backtrace for cpu 0
CPU: 0 PID: 8434 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:ipv6_defrag+0x0/0x490 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:54
Code: 5b 41 5c 41 5d 5d c3 4c 89 e7 e8 fb f9 2a fb eb 84 4c 89 e7 e8 91 fa 2a fb eb d9 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 49 89 f4 53 4d 8d 7c 24 68 48
RSP: 0018:ffff88802d609950 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffffff86871180 RBX: 0000000000000000 RCX: ffffffff8603a692
RDX: ffff88802d6099f8 RSI: ffff88801135d6c0 RDI: 0000000000000000
RBP: ffff88802d609998 R08: ffff88800e15c680 R09: ffffed1005ac7045
R10: ffffed1005ac7044 R11: ffff88802d638223 R12: ffff888010563800
R13: ffff888010563808 R14: ffff88801135d6c0 R15: dffffc0000000000
 nf_hook.constprop.0+0x3c9/0x560 include/linux/netfilter.h:262
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0x9e0/0x1490 net/ipv6/ndisc.c:505
 ndisc_send_rs+0x134/0x720 net/ipv6/ndisc.c:699
 addrconf_rs_timer+0x30f/0x6e0 net/ipv6/addrconf.c:3879
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:199
Code: c0 68 34 13 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 12 6a 96 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 e7 ab d3 f9 65 8b 05 18 54 85 78 85 c0 74 06 41
RSP: 0018:ffff888010107360 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff122668d RBX: ffff88800e15c680 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88800e15cf14
RBP: ffff888010107368 R08: 1ffffffff153779f R09: fffffbfff15377a0
R10: fffffbfff153779f R11: ffffffff8a9bbcff R12: ffff88802d637380
R13: ffff88801b0e1c00 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3124 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3224
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x8e9/0x1f30 kernel/sched/core.c:4081
 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4338
 retint_kernel+0x1b/0x2b
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:slab_alloc_node mm/slab.c:3256 [inline]
RIP: 0010:kmem_cache_alloc_node_trace+0x24d/0x750 mm/slab.c:3592
Code: 7e 0f 85 41 ff ff ff e8 a2 b3 4e ff e9 37 ff ff ff e8 07 b4 c8 ff 48 83 3d 57 80 61 07 00 0f 84 7d 01 00 00 48 8b 7d c0 57 9d <0f> 1f 44 00 00 e9 c4 fe ff ff 31 d2 be 35 02 00 00 48 c7 c7 7e 56
RSP: 0018:ffff888010107588 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: 0000000000000007 RBX: 0000000000082cc0 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: ffff888010107600 R08: 1ffffffff153779f R09: fffffbfff15377a0
R10: fffffbfff153779f R11: ffffffff8a9bbcff R12: ffff88802d002000
R13: ffff88802d002000 R14: ffff88807b50e000 R15: 0000000000082cc0
 __do_kmalloc_node mm/slab.c:3614 [inline]
 __kmalloc_node_track_caller+0x3d/0x70 mm/slab.c:3629
 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:141
 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:209
 alloc_skb include/linux/skbuff.h:1049 [inline]
 netlink_dump+0x71f/0xfb0 net/netlink/af_netlink.c:2224
 netlink_recvmsg+0xbb4/0xf50 net/netlink/af_netlink.c:2000
 sock_recvmsg_nosec net/socket.c:872 [inline]
 sock_recvmsg net/socket.c:890 [inline]
 sock_recvmsg+0xce/0x110 net/socket.c:886
 ____sys_recvmsg+0x236/0x550 net/socket.c:2561
 ___sys_recvmsg+0xff/0x190 net/socket.c:2602
 do_recvmmsg+0x27e/0x7a0 net/socket.c:2713
 __sys_recvmmsg+0xe5/0x270 net/socket.c:2794
 __do_sys_recvmmsg net/socket.c:2815 [inline]
 __se_sys_recvmmsg net/socket.c:2808 [inline]
 __x64_sys_recvmmsg+0xe6/0x140 net/socket.c:2808
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f208434ec88 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 000000000045a759
RDX: 0000000004000056 RSI: 0000000020001380 RDI: 0000000000000007
RBP: 0000000000000005 R08: 0000000020000200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f208434f6d4
R13: 00000000004af385 R14: 00000000006f2838 R15: 00000000ffffffff