__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: 1162 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: 1162 Comm: kworker/u8:8 Not tainted 6.15.0-rc6-syzkaller-00278-g172a9d94339c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x3d0/0x510 lib/ref_tracker.c:179
Code: 2a d9 fc 48 89 df 48 8b 74 24 10 e8 1a 33 6b 06 eb 1b e8 63 2a d9 fc 48 8b 5c 24 18 48 89 df 48 8b 74 24 10 e8 01 33 6b 06 90 <0f> 0b 90 4c 8d 73 44 4c 89 f7 be 04 00 00 00 e8 5c 00 39 fd 4c 89
RSP: 0018:ffffc90003bef738 EFLAGS: 00010246
RAX: fd368e19c87b2200 RBX: ffff88805f7e8610 RCX: 0000000000000000
RDX: 0000000000000007 RSI: ffffffff8d73a84c RDI: 00000000ffffffff
RBP: ffff88805f7e8660 R08: ffffffff8f7e0677 R09: 1ffffffff1efc0ce
R10: dffffc0000000000 R11: fffffbfff1efc0cf R12: ffff8880276d8180
R13: ffff88805f7e8660 R14: dffffc0000000000 R15: 1ffff11004edb030
FS:  0000000000000000(0000) GS:ffff8881261f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558855d808 CR3: 00000000686d8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 free_netdev+0x46a/0x700 net/core/dev.c:11770
 netdev_run_todo+0xd0c/0xea0 net/core/dev.c:11302
 default_device_exit_batch+0x81e/0x890 net/core/dev.c:12531
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x7a9/0xbd0 net/core/net_namespace.c:654
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>