syzbot

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refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 0 PID: 1254 at lib/refcount.c:31 refcount_warn_saturate+0xe3/0x1a0 lib/refcount.c:31
Modules linked in:
CPU: 0 PID: 1254 Comm: syz.3.7673 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:refcount_warn_saturate+0xe3/0x1a0 lib/refcount.c:31
Code: e2 09 01 0f 85 98 00 00 00 e8 99 37 79 fd 5b 41 5e c3 e8 90 37 79 fd c6 05 1c 8c e2 09 01 48 c7 c7 e0 cc be 8a e8 4d 48 45 fd <0f> 0b eb e0 e8 74 37 79 fd c6 05 fe 8b e2 09 01 48 c7 c7 20 cc be
RSP: 0018:ffffc9000603f868 EFLAGS: 00010246
RAX: 6600ecb368b1db00 RBX: 0000000000000004 RCX: 0000000000080000
RDX: ffffc90011004000 RSI: 0000000000015e71 RDI: 0000000000015e72
RBP: ffffc9000603f9b0 R08: dffffc0000000000 R09: fffff52000c07ead
R10: fffff52000c07ead R11: 1ffff92000c07eac R12: ffff8880732845b8
R13: dffffc0000000000 R14: 0000000000000004 R15: 0000000000000001
FS:  00007fb5575b46c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000002c4030 CR3: 0000000055cd2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000097 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+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 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: 0033:0x7fb55678e969
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:00007fb5575b4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffe00 RBX: 00007fb5569b5fa0 RCX: 00007fb55678e969
RDX: 0000000000000048 RSI: 00002000000001c0 RDI: 0000000000000006
RBP: 00007fb556810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb5569b5fa0 R15: 00007ffcddccf0f8
 </TASK>