__do_sys_sendto net/socket.c:2187 [inline]
     __se_sys_sendto net/socket.c:2183 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2183
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
WARNING: CPU: 1 PID: 12 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x3d0/0x510 lib/ref_tracker.c:179
Modules linked in:
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted 6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x3d0/0x510 lib/ref_tracker.c:179
Code: 79 d2 fc 48 89 df 48 8b 74 24 10 e8 4a 23 6b 06 eb 1b e8 73 79 d2 fc 48 8b 5c 24 18 48 89 df 48 8b 74 24 10 e8 31 23 6b 06 90 <0f> 0b 90 4c 8d 73 44 4c 89 f7 be 04 00 00 00 e8 8c 70 34 fd 4c 89
RSP: 0018:ffffc90000117858 EFLAGS: 00010246
RAX: a3671c69d5023800 RBX: ffff88807e688610 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8d74a0f9 RDI: 00000000ffffffff
RBP: ffff88807e688660 R08: ffffffff8f7ed577 R09: 1ffffffff1efdaae
R10: dffffc0000000000 R11: fffffbfff1efdaaf R12: ffff888030dc5cc0
R13: ffff88807e688660 R14: dffffc0000000000 R15: 1ffff110061b8b98
FS:  0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcb2568ff8 CR3: 0000000027c90000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 free_netdev+0x46a/0x700 net/core/dev.c:11780
 netdev_run_todo+0xd0c/0xea0 net/core/dev.c:11312
 cleanup_net+0x6a8/0xbd0 net/core/net_namespace.c:650
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>