unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
     ksys_unshare+0x619/0xc10 kernel/fork.c:3309
     __do_sys_unshare kernel/fork.c:3380 [inline]
     __se_sys_unshare kernel/fork.c:3378 [inline]
     __x64_sys_unshare+0x38/0x40 kernel/fork.c:3378
     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: 1 PID: 11751 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x411/0x550 lib/ref_tracker.c:179
Modules linked in:
CPU: 1 UID: 0 PID: 11751 Comm: kworker/u8:9 Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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 c8 c3 d7 06 eb 1a e8 01 97 a7 fc 48 8b 1c 24 48 89 df 48 8b 74 24 20 e8 b0 c3 d7 06 90 <0f> 0b 90 48 83 c3 44 48 89 df be 04 00 00 00 e8 3b e4 0e fd 48 89
RSP: 0018:ffffc90002d9f9e0 EFLAGS: 00010246
RAX: 1a52c7c611bf8300 RBX: ffff88802fdbdb18 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001
RBP: ffffc90002d9fab0 R08: ffffffff941e49af R09: 1ffffffff283c935
R10: dffffc0000000000 R11: fffffbfff283c936 R12: 1ffff1100fdb6008
R13: dead000000000100 R14: ffff88802fdbdb68 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558c174808 CR3: 00000000612de000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:465 [inline]
 cleanup_net+0xbf6/0xcc0 net/core/net_namespace.c:661
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>