kobject_add_internal failed for hci0 (error: -2 parent: bluetooth)
kobject_add_internal failed for hci1 (error: -2 parent: bluetooth)
------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
Bluetooth: Can't register HCI device
WARNING: CPU: 1 PID: 17630 at lib/refcount.c:153 refcount_inc+0x2b/0x30 lib/refcount.c:153
kobject: 'hci0' ((____ptrval____)): kobject_cleanup, parent           (null)
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 17630 Comm: syz-executor5 Not tainted 4.18.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x16e/0x22a lib/dump_stack.c:113
 panic+0x1c6/0x37d kernel/panic.c:184
 __warn.cold.8+0x120/0x16c kernel/panic.c:536
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:refcount_inc+0x2b/0x30 lib/refcount.c:153
Code: 48 89 e5 e8 77 f8 ff ff 84 c0 74 02 5d c3 80 
kobject: 'hci0' ((____ptrval____)): calling ktype release
3d 62 18 2d 06 00 75 f5 48 c7 c7 a0 63 e1 87 c6 05 52 18 2d 06 01 e8 f5 0a db fd <0f> 0b 5d c3 90 55 48 89 fe 
kobject: 'hci0': free name
bf 01 00 00 00 48 89 e5 e8 7f fa ff ff 
RSP: 0018:ffff8801c61ef6a8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8801d715ebc0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8aaafea0
RBP: ffff8801c61ef6a8 R08: ffffed003b5a3edb R09: ffffed003b5a3eda
R10: ffffed003b5a3eda R11: ffff8801dad1f6d7 R12: ffff8801d9bbb300
R13: ffff8801bd4f4b20 R14: ffff8801bd4f4b18 R15: ffff8801bd4f4b00
 kref_get include/linux/kref.h:47 [inline]
 kobject_get+0x43/0x90 lib/kobject.c:594
 kset_get include/linux/kobject.h:209 [inline]
 kobj_kset_join lib/kobject.c:167 [inline]
 kobject_add_internal+0x13c/0xb60 lib/kobject.c:219
Bluetooth: Can't register HCI device
kobject: 'hci1' ((____ptrval____)): kobject_cleanup, parent           (null)
 kobject_add_varg lib/kobject.c:363 [inline]
 kobject_add+0x10f/0x170 lib/kobject.c:407
kobject: 'hci1' ((____ptrval____)): calling ktype release
 class_dir_create_and_add drivers/base/core.c:1504 [inline]
 get_device_parent.isra.27+0x311/0x560 drivers/base/core.c:1559
 device_add+0x2c4/0x1640 drivers/base/core.c:1815
kobject: 'loop4' ((____ptrval____)): kobject_uevent_env
 hci_register_dev+0x351/0xa20 net/bluetooth/hci_core.c:3108
 __vhci_create_device+0x272/0x500 drivers/bluetooth/hci_vhci.c:139
 vhci_create_device drivers/bluetooth/hci_vhci.c:163 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:219 [inline]
 vhci_write+0x28a/0x3f0 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1795 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x59a/0xc20 fs/read_write.c:487
kobject: 'loop4' ((____ptrval____)): fill_kobj_path: path = '/devices/virtual/block/loop4'
 vfs_write+0x150/0x4f0 fs/read_write.c:549
 ksys_write+0xf5/0x250 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x6e/0xb0 fs/read_write.c:607
kobject: 'hci1': free name
 do_syscall_64+0x183/0x700 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457429
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f9066887c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f90668886d4 RCX: 0000000000457429
RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d8100 R14: 00000000004caddc R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..