WARNING: CPU: 1 PID: 7996 at fs/kernfs/dir.c:494 kernfs_get.part.0+0x73/0x90 fs/kernfs/dir.c:494
kobject: 'hci4' (00000000938f7bc5): calling ktype release
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7996 Comm: syz-executor101 Not tainted 4.19.48 #20
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x263/0x507 kernel/panic.c:185
kobject: 'bluetooth' (000000005315027d): kobject_add_internal: parent: 'virtual', set: '(null)'
 __warn.cold+0x20/0x4a kernel/panic.c:540
kobject: 'hci4': free name
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
kobject: 'hci1' (00000000e34eefaa): kobject_add_internal: parent: 'bluetooth', set: 'devices'
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
kobject: 'hci2' (00000000dfc32415): kobject_add_internal: parent: 'bluetooth', set: 'devices'
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1013
RIP: 0010:kernfs_get.part.0+0x73/0x90 fs/kernfs/dir.c:494
kobject: 'hci4' (000000005ece6dd6): kobject_add_internal: parent: 'bluetooth', set: 'devices'
Code: e6 e8 d1 57 9e ff 45 85 e4 74 1a e8 47 56 9e ff be 04 00 00 00 48 89 df e8 2a a9 d4 ff f0 ff 03 5b 41 5c 5d c3 e8 2d 56 9e ff <0f> 0b eb dd 48 89 df e8 81 b9 d4 ff eb c1 0f 1f 44 00 00 66 2e 0f
RSP: 0018:ffff888096e3f838 EFLAGS: 00010293
RAX: ffff888094350340 RBX: ffff888090a9b9a0 RCX: ffffffff81ccadcf
RDX: 0000000000000000 RSI: ffffffff81ccadf3 RDI: 0000000000000005
RBP: ffff888096e3f848 R08: ffff888094350340 R09: ffffed1012153735
R10: ffffed1012153734 R11: ffff888090a9b9a3 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 kernfs_get fs/kernfs/dir.c:493 [inline]
 kernfs_new_node+0xb8/0x130 fs/kernfs/dir.c:697
 kernfs_create_dir_ns+0x52/0x160 fs/kernfs/dir.c:1020
 sysfs_create_dir_ns+0x131/0x290 fs/sysfs/dir.c:58
 create_dir lib/kobject.c:88 [inline]
 kobject_add_internal lib/kobject.c:247 [inline]
 kobject_add_internal.cold+0xe5/0x5d1 lib/kobject.c:217
 kobject_add_varg lib/kobject.c:382 [inline]
 kobject_add+0x150/0x1c0 lib/kobject.c:426
 device_add+0x3cc/0x1760 drivers/base/core.c:1885
 hci_register_dev+0x304/0x880 net/bluetooth/hci_core.c:3198
 __vhci_create_device+0x2d0/0x5a0 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+0x2d6/0x470 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1820 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x587/0x810 fs/read_write.c:487
 vfs_write+0x20c/0x560 fs/read_write.c:549
 ksys_write+0x14f/0x2d0 fs/read_write.c:599
 __do_sys_write fs/read_write.c:611 [inline]
 __se_sys_write fs/read_write.c:608 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:608
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441269
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd04a2db98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441269
RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000000cd77 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401fe0
R13: 0000000000402070 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..