syzbot

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refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 0 PID: 15467 at lib/refcount.c:31 refcount_warn_saturate+0x147/0x1b0 lib/refcount.c:31
Modules linked in:
CPU: 0 PID: 15467 Comm: syz.5.2497 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:refcount_warn_saturate+0x147/0x1b0 lib/refcount.c:31
Code: 0a 01 48 c7 c7 00 1b fc 8a e8 15 91 30 fd 0f 0b eb a8 e8 1c 2f 66 fd c6 05 20 64 15 0a 01 48 c7 c7 20 1c fc 8a e8 f9 90 30 fd <0f> 0b eb 8c e8 00 2f 66 fd c6 05 01 64 15 0a 01 48 c7 c7 00 1b fc
RSP: 0018:ffffc90003437b48 EFLAGS: 00010246
RAX: 513435c7b0f7fd00 RBX: 0000000000000004 RCX: ffff888026ca0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc90003437ca0 R08: ffffc90003437747 R09: 1ffff92000686ee8
R10: dffffc0000000000 R11: fffff52000686ee9 R12: ffff88807cf945b8
R13: dffffc0000000000 R14: ffff88807cf945fc R15: 0000000000000001
FS:  0000555578ae1500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c45a682 CR3: 00000000614bb000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __refcount_dec include/linux/refcount.h:344 [inline]
 refcount_dec include/linux/refcount.h:359 [inline]
 ref_tracker_free+0x698/0x7d0 lib/ref_tracker.c:236
 netdev_tracker_free include/linux/netdevice.h:4130 [inline]
 netdev_put include/linux/netdevice.h:4147 [inline]
 ax25_release+0x356/0x930 net/ax25/af_ax25.c:1080
 __sock_release net/socket.c:659 [inline]
 sock_close+0xbd/0x230 net/socket.c:1420
 __fput+0x234/0x970 fs/file_table.c:384
 task_work_run+0x1ce/0x250 kernel/task_work.c:245
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe42e78f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe90ef0428 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe42e9e7da0 RCX: 00007fe42e78f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fe42e9e7da0 R08: 0000000000000250 R09: 0000001a90ef071f
R10: 00007fe42e9e7cb0 R11: 0000000000000246 R12: 0000000000143969
R13: 00007fe42e9e6180 R14: ffffffffffffffff R15: 00007ffe90ef0540
 </TASK>