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BUG: KASAN: slab-use-after-free in __mutex_lock+0x15a/0x1550
Read of size 8 at addr ffff8880419c28a8 by task kworker/u8:1/1416

CPU: 1 UID: 0 PID: 1416 Comm: kworker/u8:1 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: udp_tunnel_nic udp_tunnel_nic_device_sync_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 __mutex_lock+0x15a/0x1550
 udp_tunnel_nic_device_sync_work+0x39/0xa10
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 14642:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x35c/0x760
 udp_tunnel_nic_netdevice_event+0x4c3/0x17d0
 notifier_call_chain+0x1ad/0x3d0
 register_netdevice+0x18c9/0x1ec0
 nsim_create+0xbed/0x1160
 __nsim_dev_port_add+0x857/0xd30
 nsim_dev_port_add_all+0x37/0xf0
 nsim_dev_reload_up+0x45f/0x7c0
 devlink_reload+0x4f8/0x8c0
 devlink_nl_reload_doit+0xaaa/0xc80
 genl_family_rcv_msg_doit+0x22a/0x330
 genl_rcv_msg+0x61c/0x7a0
 netlink_rcv_skb+0x232/0x4b0
 genl_rcv+0x28/0x40
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15420:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 udp_tunnel_nic_netdevice_event+0x11ed/0x17d0
 notifier_call_chain+0x1ad/0x3d0
 unregister_netdevice_many_notify+0x17a5/0x22c0
 unregister_netdevice_queue+0x31f/0x360
 nsim_destroy+0x24e/0x830
 __nsim_dev_port_del+0x14f/0x200
 nsim_dev_reload_destroy+0x288/0x490
 nsim_dev_reload_down+0x8a/0xc0
 devlink_reload+0x1eb/0x8c0
 devlink_nl_reload_doit+0xaaa/0xc80
 genl_family_rcv_msg_doit+0x22a/0x330
 genl_rcv_msg+0x61c/0x7a0
 netlink_rcv_skb+0x232/0x4b0
 genl_rcv+0x28/0x40
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 insert_work+0x3d/0x330
 __queue_work+0xbad/0xfc0
 queue_work_on+0x106/0x1d0
 __udp_tunnel_nic_add_port+0xb71/0xd60
 udp_tunnel_notify_add_rx_port+0x2c0/0x3c0
 geneve_sock_add+0x591/0xa40
 geneve_open+0x8c/0x140
 __dev_open+0x44d/0x830
 __dev_change_flags+0x2fa/0x7e0
 netif_change_flags+0x88/0x1a0
 do_setlink+0xfa5/0x45a0
 rtnl_newlink+0x14ca/0x1bb0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Second to last potentially related work creation:
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 insert_work+0x3d/0x330
 __queue_work+0xccf/0xfc0
 queue_work_on+0x106/0x1d0
 __udp_tunnel_nic_add_port+0xb71/0xd60
 udp_tunnel_notify_add_rx_port+0x2c0/0x3c0
 geneve_sock_add+0x591/0xa40
 geneve_open+0xd2/0x140
 __dev_open+0x44d/0x830
 __dev_change_flags+0x2fa/0x7e0
 netif_change_flags+0x88/0x1a0
 do_setlink+0xfa5/0x45a0
 rtnl_newlink+0x14ca/0x1bb0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880419c2800
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 168 bytes inside of
 freed 256-byte region [ffff8880419c2800, ffff8880419c2900)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x419c2
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff888100041b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff888100041b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 17780, tgid 17776 (syz.1.3138), ts 411392405660, free_ts 365547356731
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x339/0x3d0
 __pcs_replace_empty_main+0x321/0x720
 __kmalloc_noprof+0x474/0x760
 hash_ip4_add+0x18ba/0x1ee0
 hash_ip4_uadt+0x664/0x860
 call_ad+0x398/0xb60
 ip_set_ad+0x824/0x9d0
 nfnetlink_rcv_msg+0xc03/0x12c0
 netlink_rcv_skb+0x232/0x4b0
 nfnetlink_rcv+0x2c0/0x27b0
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
page last free pid 7053 tgid 7053 stack trace:
 __free_frozen_pages+0xbc7/0xd30
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x2ba/0x660
 nsim_fib_event+0xf36/0xa390
 nsim_fib_event_work+0x254/0x3d0
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff8880419c2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880419c2800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880419c2880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8880419c2900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880419c2980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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