unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
     ksys_unshare+0x57d/0xa70 kernel/fork.c:3311
     __do_sys_unshare kernel/fork.c:3382 [inline]
     __se_sys_unshare kernel/fork.c:3380 [inline]
     __x64_sys_unshare+0x38/0x40 kernel/fork.c:3380
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
WARNING: CPU: 0 PID: 192 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x411/0x550 lib/ref_tracker.c:179
Modules linked in:
CPU: 0 UID: 0 PID: 192 Comm: kworker/u8:5 Not tainted 6.12.0-rc4-syzkaller-00168-ge31a8219fbfc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x411/0x550 lib/ref_tracker.c:179
Code: 48 8b 1c 24 48 89 df 48 8b 74 24 20 e8 d8 53 db 06 eb 1a e8 51 87 9f fc 48 8b 1c 24 48 89 df 48 8b 74 24 20 e8 c0 53 db 06 90 <0f> 0b 90 48 83 c3 44 48 89 df be 04 00 00 00 e8 6b 4e 09 fd 48 89
RSP: 0018:ffffc90002cff9e0 EFLAGS: 00010246
RAX: 199da4af40186400 RBX: ffff88802a041f58 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8c0acb40 RDI: 0000000000000001
RBP: ffffc90002cffab0 R08: ffffffff942ca8df R09: 1ffffffff285951b
R10: dffffc0000000000 R11: fffffbfff285951c R12: 1ffff110060ef230
R13: dead000000000100 R14: ffff88802a041fa8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555c9e458131 CR3: 0000000024d66000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:452 [inline]
 cleanup_net+0xbf6/0xcc0 net/core/net_namespace.c:647
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>