------------[ cut here ]------------
refcount_t: saturated; leaking memory.
WARNING: CPU: 0 PID: 4991 at lib/refcount.c:22 refcount_warn_saturate+0x12d/0x1e0 lib/refcount.c:22
Modules linked in:
CPU: 0 PID: 4991 Comm: syz-executor.3 Not tainted 5.15.0-rc1-next-20210914-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:refcount_warn_saturate+0x12d/0x1e0 lib/refcount.c:22
Code: 09 31 ff 89 de e8 13 a4 9e fd 84 db 0f 85 72 ff ff ff e8 c6 9d 9e fd 48 c7 c7 a0 f3 e3 89 c6 05 37 4d 82 09 01 e8 c3 af 18 05 <0f> 0b e9 53 ff ff ff e8 a7 9d 9e fd 0f b6 1d 1e 4d 82 09 31 ff 89
RSP: 0018:ffffc90003b87920 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880245a3900 RSI: ffffffff815dbe48 RDI: fffff52000770f16
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815d5c2e R11: 0000000000000000 R12: ffff88803a723a00
R13: 0000000081124350 R14: ffff888079c66968 R15: ffff88803a723a08
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c023f40cd0 CR3: 000000000b68e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __refcount_add include/linux/refcount.h:201 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 sock_hold include/net/sock.h:702 [inline]
 sco_conn_del+0x25a/0x2c0 net/bluetooth/sco.c:193
 sco_disconn_cfm+0x71/0xb0 net/bluetooth/sco.c:1372
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1541 [inline]
 hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1742
 hci_dev_do_close+0x57d/0x1150 net/bluetooth/hci_core.c:1796
 hci_unregister_dev+0x1c8/0x5b0 net/bluetooth/hci_core.c:4028
 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:360
 __fput+0x288/0x9f0 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbae/0x2a30 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2160 kernel/signal.c:2868
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: Unable to access opcode bytes at RIP 0x4665cf.
RSP: 002b:00007f1e97b8e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 0000000000000037 RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff5bf4be9f R14: 00007f1e97b8e300 R15: 0000000000022000