create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
     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: 3077 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: 3077 Comm: kworker/u8:10 Not tainted 6.12.0-rc3-next-20241014-syzkaller #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 b8 05 de 06 eb 1a e8 91 77 9d fc 48 8b 1c 24 48 89 df 48 8b 74 24 20 e8 a0 05 de 06 90 <0f> 0b 90 48 83 c3 44 48 89 df be 04 00 00 00 e8 eb 4c 07 fd 48 89
RSP: 0018:ffffc9000a9979e0 EFLAGS: 00010246
RAX: 71555b562e714e00 RBX: ffff888061432018 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8c0acf60 RDI: 0000000000000001
RBP: ffffc9000a997ab0 R08: ffffffff942e8927 R09: 1ffffffff285d124
R10: dffffc0000000000 R11: fffffbfff285d125 R12: 1ffff11005f5e928
R13: dead000000000100 R14: ffff888061432068 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7cd70c5000 CR3: 0000000070ee6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:459 [inline]
 cleanup_net+0xbf6/0xcc0 net/core/net_namespace.c:654
 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>