INFO: task syz.0.2210:14988 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2210      state:D stack:25272 pid:14988 tgid:14987 ppid:5628   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821
 nfsd_nl_expkey_get_reqs_dumpit+0xfb/0xd60 fs/nfsd/export.c:347
 genl_dumpit+0x10b/0x1b0 net/netlink/genetlink.c:1026
 netlink_dump+0x711/0xee0 net/netlink/af_netlink.c:2347
 __netlink_dump_start+0x589/0x7b0 net/netlink/af_netlink.c:2462
 genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1075
 genl_family_rcv_msg net/netlink/genetlink.c:1191 [inline]
 genl_rcv_msg+0x5e1/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2572
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb126f9e199
RSP: 002b:00007fb127e4e028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb127225fa0 RCX: 00007fb126f9e199
RDX: 00000000040088c0 RSI: 0000200000000300 RDI: 0000000000000004
RBP: 00007fb1270358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb127226038 R14: 00007fb127225fa0 R15: 00007fff05e1e758
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/33: 1, last CPU#1:
 #0: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5378: 2, on CPU#1:
 #0: ffff88803530e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz.4.1888/13597: 2, on CPU#1:
 #0: ffffffff902b91e8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
 #1: ffffffff8f09f7c0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x53d/0x1ab0 fs/nfsd/nfsctl.c:2057
locks held by syz.0.2210/14988: 3, on CPU#1:
 #0: ffffffff902b91e8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
 #1: ffff88802507f6e8 (nlk_cb_mutex-GENERIC){+.+.}-{4:4}, at: __netlink_dump_start+0xf4/0x7b0 net/netlink/af_netlink.c:2426
 #2: ffffffff8f09f7c0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_expkey_get_reqs_dumpit+0xfb/0xd60 fs/nfsd/export.c:347
locks held by syz.3.2686/17018: 2, on CPU#1:
 #0: ffffffff902b91e8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
 #1: ffffffff8f09f7c0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x53d/0x1ab0 fs/nfsd/nfsctl.c:2057
locks held by syz.2.2688/17023: 2, on CPU#1:
 #0: ffffffff902b91e8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
 #1: ffffffff8f09f7c0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_set_doit+0xcd/0x7a0 fs/nfsd/nfsctl.c:1844
locks held by syz.5.3115/18932: 1, last CPU#0:
 #0: ffff88801b09f180 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 #0: ffff88801b09f180 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x1a4/0x9f0 mm/mmap.c:1299
locks held by syz.8.3117/18935: 12, last CPU#0:
 #0: ffffffff907b52e8 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff907b52e8 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff907b52e8 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250 net/core/rtnetlink.c:595
 #1: ffffffff90254da0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #1: ffffffff90254da0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
 #1: ffffffff90254da0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc1d/0x1c30 net/core/rtnetlink.c:4245
 #2: ffffffff8ef329f8 (sysctl_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline]
 #2: ffffffff8ef329f8 (sysctl_lock){+.+.}-{3:3}, at: get_subdir fs/proc/proc_sysctl.c:1010 [inline]
 #2: ffffffff8ef329f8 (sysctl_lock){+.+.}-{3:3}, at: sysctl_mkdir_p fs/proc/proc_sysctl.c:1319 [inline]
 #2: ffffffff8ef329f8 (sysctl_lock){+.+.}-{3:3}, at: __register_sysctl_table+0xf09/0x1370 fs/proc/proc_sysctl.c:1394
 #3: ffffc90000007cc0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x5f0 kernel/time/timer.c:1745
 #4: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #4: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #4: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x203/0x1650 net/ipv6/ndisc.c:483
 #5: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #5: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #5: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: ip6_output+0x11e/0x540 net/ipv6/ip6_output.c:236
 #6: ffffffff8ed5c900 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
 #6: ffffffff8ed5c900 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:902 [inline]
 #6: ffffffff8ed5c900 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x3920 net/core/dev.c:4908
 #7: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #7: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #7: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: bond_start_xmit+0xb4/0x19e0 drivers/net/bonding/bond_main.c:5599
 #8: ffffffff8ed5c900 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
 #8: ffffffff8ed5c900 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:902 [inline]
 #8: ffffffff8ed5c900 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x3920 net/core/dev.c:4908
 #9: ffff888078040228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+...}-{3:3}, at: spin_trylock include/linux/spinlock.h:359 [inline]
 #9: ffff888078040228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+...}-{3:3}, at: qdisc_run_begin include/net/sch_generic.h:206 [inline]
 #9: ffff888078040228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+...}-{3:3}, at: __dev_xmit_skb net/core/dev.c:4300 [inline]
 #9: ffff888078040228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+...}-{3:3}, at: __dev_queue_xmit+0x114e/0x3920 net/core/dev.c:4952
 #10: ffff8880b86416d8 (&pcp->lock){+.+.}-{3:3}, at: spin_trylock include/linux/spinlock.h:359 [inline]
 #10: ffff8880b86416d8 (&pcp->lock){+.+.}-{3:3}, at: rmqueue_pcplist mm/page_alloc.c:3380 [inline]
 #10: ffff8880b86416d8 (&pcp->lock){+.+.}-{3:3}, at: rmqueue mm/page_alloc.c:3421 [inline]
 #10: ffff8880b86416d8 (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x6a1/0x2280 mm/page_alloc.c:3940
 #11: ffff88813fffbf18 (&zone->lock){-.-.}-{3:3}, at: rmqueue_bulk mm/page_alloc.c:2547 [inline]
 #11: ffff88813fffbf18 (&zone->lock){-.-.}-{3:3}, at: __rmqueue_pcplist+0x497/0x1b90 mm/page_alloc.c:3353

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 33 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18935 Comm: syz.8.3117 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__bfs kernel/locking/lockdep.c:1859 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1904 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2840 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3213 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3328 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3952 [inline]
RIP: 0010:__lock_acquire+0x1a2e/0x2de0 kernel/locking/lockdep.c:5288
Code: 14 25 ff 0f 00 00 39 05 ac a5 f6 12 73 06 89 05 a4 a5 f6 12 49 8b 06 48 89 df 4c 39 e8 0f 84 39 fe ff ff 4c 89 78 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 25 fe ff ff 48 89 fb 48 c7 c7 f0 a9 c2
RSP: 0000:ffffc900000063c0 EFLAGS: 00000006
RAX: ffffffff972f17f8 RBX: 00000000000003dd RCX: 00000000000000d0
RDX: 0000000000000002 RSI: ffff88803040eb50 RDI: 00000000000003dd
RBP: cf0781055e5514f1 R08: ffffc90000006388 R09: 0000000000000020
R10: 0000000000000003 R11: ffffffff81a3c7d0 R12: 00000000000000cf
R13: ffffffff943c53c0 R14: ffffffff97286258 R15: ffffffff972865d8
FS:  00007f2f018436c0(0000) GS:ffff888124cda000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2cc1bb CR3: 0000000058548000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:73
 ktime_get+0x45/0x220 kernel/time/timekeeping.c:1002
 clockevents_program_event+0x290/0x630 kernel/time/clockevents.c:363
 hrtimer_rearm kernel/time/hrtimer.c:2176 [inline]
 __hrtimer_rearm_deferred+0x36c/0x4b0 kernel/time/hrtimer.c:2196
 hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:58 [inline]
 hrtimer_rearm_deferred include/linux/hrtimer_rearm.h:67 [inline]
 irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:505 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline]
 irqentry_exit+0x8d3/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 cd 1f bb f5 f7 c3 00 02 00 00 74 05 e8 60 6d e7 f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 04 1d ac f5 65 48 8b 05 4c 80 ab 07 48 85 c0 74 18 5b 41 5e e9
RSP: 0000:ffffc90000006810 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000505
RDX: 0000000000000002 RSI: ffffffff8e405b24 RDI: 0000000000000001
RBP: 00000000fffffe00 R08: ffffffff9079a57f R09: 1ffffffff20f34af
R10: dffffc0000000000 R11: fffffbfff20f34b0 R12: ffff8880b86417e0
R13: ffff8880b8641700 R14: ffff88813fffbf00 R15: ffffea0002048010
 spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
 rmqueue_bulk mm/page_alloc.c:2567 [inline]
 __rmqueue_pcplist+0x129e/0x1b90 mm/page_alloc.c:3353
 rmqueue_pcplist mm/page_alloc.c:3391 [inline]
 rmqueue mm/page_alloc.c:3421 [inline]
 get_page_from_freelist+0x71a/0x2280 mm/page_alloc.c:3940
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486
 ___kmalloc_large_node+0x4f/0x120 mm/slub.c:5353
 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5385
 __do_kmalloc_node mm/slub.c:5402 [inline]
 __kmalloc_node_track_caller_noprof+0x15e/0x720 mm/slub.c:5545
 kmalloc_reserve net/core/skbuff.c:637 [inline]
 pskb_expand_head+0x22c/0x13a0 net/core/skbuff.c:2315
 __skb_cow include/linux/skbuff.h:3895 [inline]
 skb_cow_head include/linux/skbuff.h:3929 [inline]
 gre_tap_xmit+0x417/0x760 net/ipv4/ip_gre.c:780
 __netdev_start_xmit include/linux/netdevice.h:5433 [inline]
 netdev_start_xmit include/linux/netdevice.h:5442 [inline]
 xmit_one net/core/dev.c:3989 [inline]
 dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:4005
 sch_direct_xmit+0x257/0x4c0 net/sched/sch_generic.c:372
 qdisc_restart net/sched/sch_generic.c:437 [inline]
 __qdisc_run+0xb11/0x1620 net/sched/sch_generic.c:445
 __dev_xmit_skb net/core/dev.c:4315 [inline]
 __dev_queue_xmit+0x17e7/0x3920 net/core/dev.c:4952
 __bond_start_xmit drivers/net/bonding/bond_main.c:5579 [inline]
 bond_start_xmit+0x70a/0x19e0 drivers/net/bonding/bond_main.c:5601
 __netdev_start_xmit include/linux/netdevice.h:5433 [inline]
 netdev_start_xmit include/linux/netdevice.h:5442 [inline]
 xmit_one net/core/dev.c:3989 [inline]
 dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:4005
 __dev_queue_xmit+0x14d1/0x3920 net/core/dev.c:4994
 NF_HOOK_COND include/linux/netfilter.h:314 [inline]
 ip6_output+0x337/0x540 net/ipv6/ip6_output.c:248
 dst_output include/net/dst.h:472 [inline]
 NF_HOOK include/linux/netfilter.h:325 [inline]
 ndisc_send_skb+0xcb2/0x1650 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d2/0x6c0 net/ipv6/addrconf.c:4078
 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
 run_timer_base kernel/time/timer.c:2395 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__sanitizer_cov_trace_pc+0x5e/0x80 kernel/kcov.c:218
Code: 00 00 00 10 0f 93 c2 40 08 f2 75 35 83 b9 44 17 00 00 00 74 2c 8b 91 18 17 00 00 83 fa 02 75 21 48 8b 91 20 17 00 00 48 8b 32 <48> 8d 7e 01 8b 89 1c 17 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0000:ffffc9000de7e7b8 EFLAGS: 00000246
RAX: ffffffff82781405 RBX: ffff8880749bcf60 RCX: ffff88803040ddc0
RDX: ffffc90012cba000 RSI: 0000000000006e74 RDI: 0000000000006e74
RBP: ffff8880430b8cb8 R08: 0000000000000007 R09: 00000000749bcf00
R10: dffffc0000000000 R11: fffff52001bcfd04 R12: ffff8880749bcf68
R13: 0000000000000004 R14: ffff88803697e460 R15: ffff8880595d4a68
 insert_entry fs/proc/proc_sysctl.c:154 [inline]
 insert_header+0xc75/0x1260 fs/proc/proc_sysctl.c:252
 get_subdir fs/proc/proc_sysctl.c:1023 [inline]
 sysctl_mkdir_p fs/proc/proc_sysctl.c:1319 [inline]
 __register_sysctl_table+0xfca/0x1370 fs/proc/proc_sysctl.c:1394
 neigh_sysctl_register+0x9b1/0xa90 net/core/neighbour.c:3926
 addrconf_sysctl_register+0xb3/0x1c0 net/ipv6/addrconf.c:7401
 ipv6_add_dev+0xd5f/0x1400 net/ipv6/addrconf.c:463
 addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3689
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2349 [inline]
 call_netdevice_notifiers net/core/dev.c:2363 [inline]
 register_netdevice+0x1c03/0x2280 net/core/dev.c:11635
 ipip6_tunnel_create+0x1e5/0x480 net/ipv6/sit.c:259
 ipip6_newlink+0x38b/0x6d0 net/ipv6/sit.c:1726
 rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:4000
 __rtnl_newlink net/core/rtnetlink.c:4129 [inline]
 rtnl_newlink+0x167a/0x1c30 net/core/rtnetlink.c:4246
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7163
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2572
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f0099e199
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2f01843028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2f00c25fa0 RCX: 00007f2f0099e199
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000003
RBP: 00007f2f00a358e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2f00c26038 R14: 00007f2f00c25fa0 R15: 00007ffc345ec768
 </TASK>