udp_sock_create include/net/udp_tunnel.h:59 [inline]
     sctp_udp_sock_start+0x10b/0x4b0 net/sctp/protocol.c:892
     proc_sctp_do_udp_port+0x380/0x450 net/sctp/sysctl.c:555
     proc_sys_call_handler+0x3c6/0x5a0 fs/proc/proc_sysctl.c:601
     iter_file_splice_write+0x90f/0x10b0 fs/splice.c:743
     do_splice_from fs/splice.c:941 [inline]
     direct_splice_actor+0x18f/0x6c0 fs/splice.c:1164
     splice_direct_to_actor+0x346/0xa40 fs/splice.c:1108
     do_splice_direct_actor fs/splice.c:1207 [inline]
     do_splice_direct+0x178/0x250 fs/splice.c:1233
     do_sendfile+0xafb/0xe40 fs/read_write.c:1363
     __do_sys_sendfile64 fs/read_write.c:1424 [inline]
     __se_sys_sendfile64 fs/read_write.c:1410 [inline]
     __x64_sys_sendfile64+0x1da/0x220 fs/read_write.c:1410
     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: 1 PID: 11315 at lib/ref_tracker.c:179 ref_tracker_dir_exit+0x3e3/0x680 lib/ref_tracker.c:179
Modules linked in:
CPU: 1 UID: 0 PID: 11315 Comm: kworker/u8:45 Tainted: G     U             6.14.0-rc4-syzkaller #0
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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 12 c8 fc 48 8b 74 24 18 48 89 ef e8 ae d8 65 06 90 <0f> 0b 90 e8 95 12 c8 fc 48 8d 5d 44 be 04 00 00 00 48 89 df e8 64
RSP: 0018:ffffc900055afab0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8b6cec80 RDI: 0000000000000001
RBP: ffff888035e801e0 R08: 0000000000000001 R09: fffffbfff2dd7dba
R10: ffffffff96ebedd7 R11: 0000000000002ba2 R12: ffff888035e80230
R13: ffff888035e80230 R14: ffff888035e80230 R15: ffff888035e80230
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000017d000 CR3: 0000000063c3c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 net_passive_dec net/core/net_namespace.c:473 [inline]
 net_passive_dec+0x89/0xd0 net/core/net_namespace.c:467
 cleanup_net+0x8ac/0xb30 net/core/net_namespace.c:675
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>