unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228
     ksys_unshare+0x419/0x970 kernel/fork.c:3322
     __do_sys_unshare kernel/fork.c:3393 [inline]
     __se_sys_unshare kernel/fork.c:3391 [inline]
     __x64_sys_unshare+0x31/0x40 kernel/fork.c:3391
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xd5/0x260 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x6d/0x75
------------[ cut here ]------------
WARNING: CPU: 0 PID: 50 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x3e3/0x680 lib/ref_tracker.c:179
Modules linked in:
CPU: 0 PID: 50 Comm: kworker/u8:3 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: netns cleanup_net
RIP: 0010:ref_tracker_dir_exit+0x3e3/0x680 lib/ref_tracker.c:179
Code: 11 02 00 00 4d 39 f5 49 8b 06 4d 89 f7 0f 85 0e ff ff ff 48 8b 2c 24 e8 ab 5b e4 fc 48 8b 74 24 18 48 89 ef e8 ee 0e 2d 06 90 <0f> 0b 90 e8 95 5b e4 fc 48 8d 5d 44 be 04 00 00 00 48 89 df e8 74
RSP: 0018:ffffc90000ba7b38 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8b0cc880 RDI: 0000000000000001
RBP: ffff888023a101d8 R08: 0000000000000001 R09: fffffbfff27b7857
R10: ffffffff93dbc2bf R11: ffffffff81004ffa R12: ffff888023a10228
R13: ffff888023a10228 R14: ffff888023a10228 R15: ffff888023a10228
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31125000 CR3: 000000002c472000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:462 [inline]
 net_free net/core/net_namespace.c:456 [inline]
 cleanup_net+0x986/0xbf0 net/core/net_namespace.c:658
 process_one_work+0x9ac/0x1a60 kernel/workqueue.c:3254
 process_scheduled_works kernel/workqueue.c:3335 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416
 kthread+0x2c4/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>