=====================================================
BUG: KMSAN: uninit-value in ref_tracker_free+0x5ca/0xec0 lib/ref_tracker.c:228
 ref_tracker_free+0x5ca/0xec0 lib/ref_tracker.c:228
 netdev_tracker_free include/linux/netdevice.h:4295 [inline]
 netdev_put include/linux/netdevice.h:4312 [inline]
 neigh_parms_release+0x212/0x3d0 net/core/neighbour.c:1711
 inetdev_destroy net/ipv4/devinet.c:343 [inline]
 inetdev_event+0x1412/0x1e60 net/ipv4/devinet.c:1663
 notifier_call_chain kernel/notifier.c:85 [inline]
 raw_notifier_call_chain+0xe8/0x440 kernel/notifier.c:453
 call_netdevice_notifiers_info+0x1be/0x2b0 net/core/dev.c:2141
 call_netdevice_notifiers_extack net/core/dev.c:2179 [inline]
 call_netdevice_notifiers net/core/dev.c:2193 [inline]
 unregister_netdevice_many_notify+0x1fbf/0x3e30 net/core/dev.c:11809
 unregister_netdevice_many net/core/dev.c:11875 [inline]
 default_device_exit_batch+0x14cb/0x1590 net/core/dev.c:12360
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x1113/0x1d20 net/core/net_namespace.c:652
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3317
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3398
 kthread+0x6b9/0xef0 kernel/kthread.c:464
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 __alloc_frozen_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4762
 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2270
 alloc_frozen_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2341
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x23a/0x1110 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0x1287/0x3540 mm/slub.c:3826
 __slab_alloc mm/slub.c:3916 [inline]
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 __do_kmalloc_node mm/slub.c:4293 [inline]
 __kmalloc_node_track_caller_noprof+0xa81/0x1240 mm/slub.c:4313
 kmemdup_noprof+0x48/0xc0 mm/util.c:135
 neigh_parms_alloc+0x8e/0x960 net/core/neighbour.c:1667
 inetdev_init+0x1e8/0x8e0 net/ipv4/devinet.c:288
 inetdev_event+0xbec/0x1e60 net/ipv4/devinet.c:1598
 notifier_call_chain kernel/notifier.c:85 [inline]
 raw_notifier_call_chain+0xe8/0x440 kernel/notifier.c:453
 call_netdevice_notifiers_info+0x1be/0x2b0 net/core/dev.c:2141
 call_netdevice_notifiers_extack net/core/dev.c:2179 [inline]
 call_netdevice_notifiers net/core/dev.c:2193 [inline]
 register_netdevice+0x2124/0x22f0 net/core/dev.c:10915
 macvlan_common_newlink+0x1ab8/0x1fc0 drivers/net/macvlan.c:1536
 macvlan_newlink+0x4f/0x70 drivers/net/macvlan.c:1572
 rtnl_newlink_create+0x3a9/0x11a0 net/core/rtnetlink.c:3795
 __rtnl_newlink net/core/rtnetlink.c:3906 [inline]
 rtnl_newlink+0x290b/0x3850 net/core/rtnetlink.c:4021
 rtnetlink_rcv_msg+0x1061/0x1410 net/core/rtnetlink.c:6911
 netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x34/0x40 net/core/rtnetlink.c:6938
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:728
 __sys_sendto+0x594/0x750 net/socket.c:2182
 __do_sys_sendto net/socket.c:2189 [inline]
 __se_sys_sendto net/socket.c:2185 [inline]
 __x64_sys_sendto+0x125/0x1d0 net/socket.c:2185
 x64_sys_call+0x346a/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 4185 Comm: kworker/u8:22 Not tainted 6.13.0-syzkaller-09338-g05dbaf8dd8bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: netns cleanup_net
=====================================================