syzbot

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refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 1 PID: 12276 at lib/refcount.c:31 refcount_warn_saturate+0x147/0x1b0 lib/refcount.c:31
Modules linked in:
CPU: 1 PID: 12276 Comm: syz.4.12757 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:refcount_warn_saturate+0x147/0x1b0 lib/refcount.c:31
Code: 0a 01 48 c7 c7 40 27 1c 8b e8 05 7e 27 fd 0f 0b eb a8 e8 fc ba 5d fd c6 05 60 29 4c 0a 01 48 c7 c7 60 28 1c 8b e8 e9 7d 27 fd <0f> 0b eb 8c e8 e0 ba 5d fd c6 05 41 29 4c 0a 01 48 c7 c7 40 27 1c
RSP: 0018:ffffc9000c13fb48 EFLAGS: 00010246
RAX: fab9b6db897d2400 RBX: 0000000000000004 RCX: ffff888061f51e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc9000c13fca0 R08: ffffc9000c13f747 R09: 1ffff92001827ee8
R10: dffffc0000000000 R11: fffff52001827ee9 R12: f8f8f8f8f8f8f8f8
R13: dffffc0000000000 R14: ffff88807da785fc R15: 0000000000000001
FS:  0000555571954500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e718ff8 CR3: 000000003c61d000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __refcount_dec include/linux/refcount.h:344 [inline]
 refcount_dec include/linux/refcount.h:359 [inline]
 ref_tracker_free+0x70b/0x840 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+0x1d4/0x260 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+0xee/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+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f05e079c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd607fc7d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f05e0a17da0 RCX: 00007f05e079c629
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f05e0a17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f05e0a17cb0 R11: 0000000000000246 R12: 00000000002f27b8
R13: 00007f05e0a1618c R14: 00000000002f260c R15: 00007f05e0a16180
 </TASK>