syzbot

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refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 0 PID: 13413 at lib/refcount.c:31 refcount_warn_saturate+0xe3/0x1a0 lib/refcount.c:31
Modules linked in:
CPU: 0 PID: 13413 Comm: syz.6.1549 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:refcount_warn_saturate+0xe3/0x1a0 lib/refcount.c:31
Code: e3 09 01 0f 85 98 00 00 00 e8 09 bb 79 fd 5b 41 5e c3 e8 00 bb 79 fd c6 05 9b 83 e3 09 01 48 c7 c7 60 b8 be 8a e8 6d d6 45 fd <0f> 0b eb e0 e8 e4 ba 79 fd c6 05 7d 83 e3 09 01 48 c7 c7 a0 b7 be
RSP: 0018:ffffc900049cf848 EFLAGS: 00010246
RAX: 1694013d4967db00 RBX: 0000000000000004 RCX: 0000000000080000
RDX: ffffc9000d781000 RSI: 000000000002c2eb RDI: 000000000002c2ec
RBP: ffffc900049cf990 R08: dffffc0000000000 R09: fffffbfff2119077
R10: fffffbfff2119077 R11: 1ffffffff2119076 R12: ffff8880267e45b8
R13: dffffc0000000000 R14: 0000000000000004 R15: 0000000000000001
FS:  00007f1253f706c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec979d3d58 CR3: 000000007699a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_dec include/linux/refcount.h:344 [inline]
 refcount_dec include/linux/refcount.h:359 [inline]
 ref_tracker_free+0x694/0x7c0 lib/ref_tracker.c:118
 netdev_tracker_free include/linux/netdevice.h:4071 [inline]
 netdev_put include/linux/netdevice.h:4088 [inline]
 ax25_release+0x3c8/0x940 net/ax25/af_ax25.c:1080
 __sock_release net/socket.c:654 [inline]
 sock_close+0xd5/0x240 net/socket.c:1400
 __fput+0x22c/0x920 fs/file_table.c:320
 task_work_run+0x1ca/0x250 kernel/task_work.c:203
 get_signal+0x11a6/0x1350 kernel/signal.c:2648
 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f125318f749
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:00007f1253f70038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffe00 RBX: 00007f12533e5fa0 RCX: 00007f125318f749
RDX: 0000000000000048 RSI: 00002000000001c0 RDI: 000000000000000c
RBP: 00007f1253213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f12533e6038 R14: 00007f12533e5fa0 R15: 00007ffdbfc9e068
 </TASK>