netlink: 'syz-executor.1': attribute type 21 has an invalid length.
netlink: 'syz-executor.1': attribute type 1 has an invalid length.
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0 Not tainted
------------------------------------------------------
syz-executor.1/5602 is trying to acquire lock:
ffffffff8dd263e0 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:334 [inline]
ffffffff8dd263e0 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
ffffffff8dd263e0 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
ffffffff8dd263e0 (console_owner){....}-{0:0}, at: console_flush_all+0x14e/0xfc0 kernel/printk/printk.c:2971

but task is already holding lock:
ffff8880b953e698 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:559

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:559
       raw_spin_rq_lock kernel/sched/sched.h:1387 [inline]
       rq_lock kernel/sched/sched.h:1701 [inline]
       task_fork_fair+0x5d/0x1e0 kernel/sched/fair.c:12641
       sched_cgroup_fork+0x378/0x410 kernel/sched/core.c:4845
       copy_process+0x220b/0x3df0 kernel/fork.c:2499
       kernel_clone+0x222/0x8e0 kernel/fork.c:2797
       user_mode_thread+0x12e/0x190 kernel/fork.c:2875
       rest_init+0x23/0x300 init/main.c:704
       start_kernel+0x476/0x4f0 init/main.c:1081
       x86_64_start_reservations+0x26/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x95/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
       try_to_wake_up+0xac/0x1450 kernel/sched/core.c:4262
       __wake_up_common kernel/sched/wait.c:89 [inline]
       __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
       tty_port_default_wakeup+0xa2/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6a9/0x8a0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq+0x554/0x710 drivers/tty/serial/8250/8250_port.c:1932
       serial8250_default_handle_irq+0xcd/0x1e0 drivers/tty/serial/8250/8250_port.c:1952
       serial8250_interrupt+0xa5/0x1e0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x296/0xa60 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x85/0x1f0 kernel/irq/handle.c:210
       handle_edge_irq+0x25b/0xc20 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:238 [inline]
       __common_interrupt+0x134/0x230 arch/x86/kernel/irq.c:257
       common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:693
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0xd4/0x140 kernel/locking/spinlock.c:194
       __debug_check_no_obj_freed lib/debugobjects.c:998 [inline]
       debug_check_no_obj_freed+0x490/0x510 lib/debugobjects.c:1019
       slab_free_hook mm/slub.c:2078 [inline]
       slab_free mm/slub.c:4280 [inline]
       kmem_cache_free+0xd0/0x350 mm/slub.c:4344
       path_openat+0x2ab5/0x3230 fs/namei.c:3808
       do_filp_open+0x231/0x490 fs/namei.c:3826
       do_sys_openat2+0x13a/0x1d0 fs/open.c:1406
       do_sys_open fs/open.c:1421 [inline]
       __do_sys_openat fs/open.c:1437 [inline]
       __se_sys_openat fs/open.c:1432 [inline]
       __x64_sys_openat+0x243/0x290 fs/open.c:1432
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x76/0x7e

-> #2 (&tty->write_wait){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       __wake_up_common_lock+0x25/0x1e0 kernel/sched/wait.c:105
       tty_port_default_wakeup+0xa2/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6a9/0x8a0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq+0x554/0x710 drivers/tty/serial/8250/8250_port.c:1932
       serial8250_default_handle_irq+0xcd/0x1e0 drivers/tty/serial/8250/8250_port.c:1952
       serial8250_interrupt+0xa5/0x1e0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x296/0xa60 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x85/0x1f0 kernel/irq/handle.c:210
       handle_edge_irq+0x25b/0xc20 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:238 [inline]
       __common_interrupt+0x134/0x230 arch/x86/kernel/irq.c:257
       common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:693
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0xd4/0x140 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       uart_port_unlock_irqrestore include/linux/serial_core.h:670 [inline]
       uart_write+0x433/0x5c0 drivers/tty/serial/serial_core.c:629
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0xd66/0x1230 drivers/tty/n_tty.c:2379
       iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
       file_tty_write+0x54f/0x9b0 drivers/tty/tty_io.c:1096
       call_write_iter include/linux/fs.h:2110 [inline]
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0xa53/0xca0 fs/read_write.c:590
       ksys_write+0x19c/0x2c0 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x76/0x7e

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:619 [inline]
       serial8250_console_write+0x1a4/0x1770 drivers/tty/serial/8250/8250_port.c:3355
       console_emit_next_record kernel/printk/printk.c:2913 [inline]
       console_flush_all+0x863/0xfc0 kernel/printk/printk.c:2979
       console_unlock+0x137/0x4d0 kernel/printk/printk.c:3048
       vprintk_emit+0x5a2/0x760 kernel/printk/printk.c:2348
       _printk+0xd1/0x120 kernel/printk/printk.c:2373
       register_console+0x721/0xce0 kernel/printk/printk.c:3569
       univ8250_console_init+0x45/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0x1b4/0x6d0 kernel/printk/printk.c:3715
       start_kernel+0x2cf/0x4f0 init/main.c:1016
       x86_64_start_reservations+0x26/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x95/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x3a1f/0x7fa0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1e9/0x540 kernel/locking/lockdep.c:5754
       console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
       console_emit_next_record kernel/printk/printk.c:2907 [inline]
       console_flush_all+0x80c/0xfc0 kernel/printk/printk.c:2979
       console_unlock+0x137/0x4d0 kernel/printk/printk.c:3048
       vprintk_emit+0x5a2/0x760 kernel/printk/printk.c:2348
       _printk+0xd1/0x120 kernel/printk/printk.c:2373
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail_ex+0x38d/0x4e0 lib/fault-inject.c:153
       strncpy_from_user+0x32/0x2c0 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x6d/0x140 mm/maccess.c:186
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
       ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline]
       bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:222
       bpf_prog_6fb7ada547f278f2+0x35/0x37
       bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
       __bpf_prog_run include/linux/filter.h:657 [inline]
       bpf_prog_run include/linux/filter.h:664 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
       bpf_trace_run4+0x256/0x480 kernel/trace/bpf_trace.c:2422
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x27f6/0x4bf0 kernel/sched/core.c:6743
       preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6925
       preempt_schedule+0xdd/0xf0 kernel/sched/core.c:6949
       preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk_64.S:12
       vprintk_emit+0x68c/0x760 kernel/printk/printk.c:2349
       _printk+0xd1/0x120 kernel/printk/printk.c:2373
       validate_nla lib/nlattr.c:414 [inline]
       __nla_validate_parse+0x19fa/0x2f60 lib/nlattr.c:635
       __nla_parse+0x3c/0x50 lib/nlattr.c:732
       nla_parse_nested_deprecated include/net/netlink.h:1325 [inline]
       ip6_tun_build_state+0xf7/0x860 net/ipv4/ip_tunnel_core.c:949
       lwtunnel_build_state+0x368/0x4c0 net/core/lwtunnel.c:135
       fib_nh_common_init+0x155/0x460 net/ipv4/fib_semantics.c:604
       fib_nh_init+0x9b/0x420 net/ipv4/fib_semantics.c:630
       fib_create_info+0xf82/0x2510 net/ipv4/fib_semantics.c:1497
       fib_table_insert+0x1f2/0x1f20 net/ipv4/fib_trie.c:1237
       inet_rtm_newroute+0x145/0x280 net/ipv4/fib_frontend.c:903
       rtnetlink_rcv_msg+0x897/0x10d0 net/core/rtnetlink.c:6595
       netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2559
       netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
       netlink_unicast+0x7e6/0x980 net/netlink/af_netlink.c:1361
       netlink_sendmsg+0x8dd/0xcb0 net/netlink/af_netlink.c:1905
       sock_sendmsg_nosec net/socket.c:730 [inline]
       __sock_sendmsg+0x221/0x270 net/socket.c:745
       ____sys_sendmsg+0x521/0x7d0 net/socket.c:2584
       ___sys_sendmsg net/socket.c:2638 [inline]
       __sys_sendmsg+0x2ac/0x3a0 net/socket.c:2667
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x76/0x7e

other info that might help us debug this:

Chain exists of:
  console_owner --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock(console_owner);

 *** DEADLOCK ***

5 locks held by syz-executor.1/5602:
 #0: ffffffff8ef23348 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8ef23348 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x83e/0x10d0 net/core/rtnetlink.c:6592
 #1: ffff8880b953e698 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:559
 #2: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #2: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #2: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #2: ffffffff8dd321a0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x480 kernel/trace/bpf_trace.c:2422
 #3: ffffffff8dc0dd00 (console_lock){+.+.}-{0:0}, at: _printk+0xd1/0x120 kernel/printk/printk.c:2373
 #4: ffffffff8dc0d930 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:334 [inline]
 #4: ffffffff8dc0d930 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #4: ffffffff8dc0d930 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
 #4: ffffffff8dc0d930 (console_srcu){....}-{0:0}, at: console_flush_all+0x14e/0xfc0 kernel/printk/printk.c:2971

stack backtrace:
CPU: 1 PID: 5602 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x23d/0x360 lib/dump_stack.c:114
 check_noncircular+0x375/0x4a0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x3a1f/0x7fa0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e9/0x540 kernel/locking/lockdep.c:5754
 console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
 console_emit_next_record kernel/printk/printk.c:2907 [inline]
 console_flush_all+0x80c/0xfc0 kernel/printk/printk.c:2979
 console_unlock+0x137/0x4d0 kernel/printk/printk.c:3048
 vprintk_emit+0x5a2/0x760 kernel/printk/printk.c:2348
 _printk+0xd1/0x120 kernel/printk/printk.c:2373
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail_ex+0x38d/0x4e0 lib/fault-inject.c:153
 strncpy_from_user+0x32/0x2c0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6d/0x140 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:222
 bpf_prog_6fb7ada547f278f2+0x35/0x37
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x256/0x480 kernel/trace/bpf_trace.c:2422
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x27f6/0x4bf0 kernel/sched/core.c:6743
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6925
 preempt_schedule+0xdd/0xf0 kernel/sched/core.c:6949
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk_64.S:12
 vprintk_emit+0x68c/0x760 kernel/printk/printk.c:2349
 _printk+0xd1/0x120 kernel/printk/printk.c:2373
 validate_nla lib/nlattr.c:414 [inline]
 __nla_validate_parse+0x19fa/0x2f60 lib/nlattr.c:635
 __nla_parse+0x3c/0x50 lib/nlattr.c:732
 nla_parse_nested_deprecated include/net/netlink.h:1325 [inline]
 ip6_tun_build_state+0xf7/0x860 net/ipv4/ip_tunnel_core.c:949
 lwtunnel_build_state+0x368/0x4c0 net/core/lwtunnel.c:135
 fib_nh_common_init+0x155/0x460 net/ipv4/fib_semantics.c:604
 fib_nh_init+0x9b/0x420 net/ipv4/fib_semantics.c:630
 fib_create_info+0xf82/0x2510 net/ipv4/fib_semantics.c:1497
 fib_table_insert+0x1f2/0x1f20 net/ipv4/fib_trie.c:1237
 inet_rtm_newroute+0x145/0x280 net/ipv4/fib_frontend.c:903
 rtnetlink_rcv_msg+0x897/0x10d0 net/core/rtnetlink.c:6595
 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2559
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7e6/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8dd/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x521/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2ac/0x3a0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdf7327cba9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdf740590c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdf7339bf80 RCX: 00007fdf7327cba9
RDX: 0000000000000000 RSI: 0000000020000940 RDI: 0000000000000003
RBP: 00007fdf74059120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fdf7339bf80 R15: 00007ffdc70f0858
 </TASK>
CPU: 1 PID: 5602 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x23d/0x360 lib/dump_stack.c:114
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x3ac/0x4e0 lib/fault-inject.c:153
 strncpy_from_user+0x32/0x2c0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6d/0x140 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:225 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:222
 bpf_prog_6fb7ada547f278f2+0x35/0x37
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x256/0x480 kernel/trace/bpf_trace.c:2422
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x27f6/0x4bf0 kernel/sched/core.c:6743
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6925
 preempt_schedule+0xdd/0xf0 kernel/sched/core.c:6949
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk_64.S:12
 vprintk_emit+0x68c/0x760 kernel/printk/printk.c:2349
 _printk+0xd1/0x120 kernel/printk/printk.c:2373
 validate_nla lib/nlattr.c:414 [inline]
 __nla_validate_parse+0x19fa/0x2f60 lib/nlattr.c:635
 __nla_parse+0x3c/0x50 lib/nlattr.c:732
 nla_parse_nested_deprecated include/net/netlink.h:1325 [inline]
 ip6_tun_build_state+0xf7/0x860 net/ipv4/ip_tunnel_core.c:949
 lwtunnel_build_state+0x368/0x4c0 net/core/lwtunnel.c:135
 fib_nh_common_init+0x155/0x460 net/ipv4/fib_semantics.c:604
 fib_nh_init+0x9b/0x420 net/ipv4/fib_semantics.c:630
 fib_create_info+0xf82/0x2510 net/ipv4/fib_semantics.c:1497
 fib_table_insert+0x1f2/0x1f20 net/ipv4/fib_trie.c:1237
 inet_rtm_newroute+0x145/0x280 net/ipv4/fib_frontend.c:903
 rtnetlink_rcv_msg+0x897/0x10d0 net/core/rtnetlink.c:6595
 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2559
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7e6/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8dd/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x521/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2ac/0x3a0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdf7327cba9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdf740590c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdf7339bf80 RCX: 00007fdf7327cba9
RDX: 0000000000000000 RSI: 0000000020000940 RDI: 0000000000000003
RBP: 00007fdf74059120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fdf7339bf80 R15: 00007ffdc70f0858
 </TASK>
syz-executor.1 (5602) used greatest stack depth: 17840 bytes left