ndisc_net_init+0x89/0x250 net/ipv6/ndisc.c:2001
     ops_init+0x1e2/0x5f0 net/core/net_namespace.c:139
     setup_net+0x21f/0x860 net/core/net_namespace.c:356
     copy_net_ns+0x2b4/0x6b0 net/core/net_namespace.c:494
     create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110
     unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:228
     ksys_unshare+0x45d/0xa40 kernel/fork.c:3311
     __do_sys_unshare kernel/fork.c:3382 [inline]
     __se_sys_unshare kernel/fork.c:3380 [inline]
     __x64_sys_unshare+0x31/0x40 kernel/fork.c:3380
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4484 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x3e3/0x680 lib/ref_tracker.c:179
Modules linked in:
CPU: 0 UID: 0 PID: 4484 Comm: kworker/u8:8 Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #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+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 eb a0 cf fc 48 8b 74 24 18 48 89 ef e8 ee bd 65 06 90 <0f> 0b 90 e8 d5 a0 cf fc 48 8d 5d 44 be 04 00 00 00 48 89 df e8 b4
RSP: 0018:ffffc9000e48fb30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8b6cd040 RDI: 0000000000000001
RBP: ffff888060e501d8 R08: 0000000000000001 R09: fffffbfff2dc53a2
R10: ffffffff96e29d17 R11: 0000000000000052 R12: ffff888060e50228
R13: ffff888060e50228 R14: ffff888060e50228 R15: ffff888060e50228
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe3243d008 CR3: 000000007bd60000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 net_free net/core/net_namespace.c:452 [inline]
 net_free net/core/net_namespace.c:446 [inline]
 cleanup_net+0x912/0xb40 net/core/net_namespace.c:647
 process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>