ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:412
kobject_add_internal failed for hci5:0 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci5: failed to register connection device
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8621 Comm: syz-executor.4 Not tainted 4.18.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:klist_next+0x48/0x3e0 lib/klist.c:377
Code: 48 89 fb 48 83 ec 10 80 3c 02 00 0f 85 ce 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d 7c 24 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a1 02 00 00 4c 8d 6b 08 4d 8b 7c 24 50 48 b8 00 
RSP: 0018:ffff8800b01376f0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8800b0137768 RCX: ffffffff813c8f13
RDX: 000000000000000a RSI: ffff8800b0137768 RDI: 0000000000000050
RBP: ffff8800b0137728 R08: ffffed001574594d R09: ffffed001574594c
R10: ffffed001574594c R11: ffff8800aba2ca63 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff86bb9860 R15: dffffc0000000000
FS:  00000000028da400(0000) GS:ffff8800ba600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564613819928 CR3: 00000000a1e3e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 next_device drivers/base/core.c:2081 [inline]
 device_find_child+0xb1/0x170 drivers/base/core.c:2224
 hci_conn_del_sysfs+0xaa/0x150 net/bluetooth/hci_sysfs.c:71
 hci_conn_cleanup+0x1ff/0x4e0 net/bluetooth/hci_conn.c:128
 hci_conn_del+0x22c/0x6b0 net/bluetooth/hci_conn.c:611
 hci_conn_hash_flush+0x171/0x230 net/bluetooth/hci_conn.c:1367
 hci_dev_do_close+0x4ea/0xda0 net/bluetooth/hci_core.c:1611
 hci_unregister_dev+0x167/0x880 net/bluetooth/hci_core.c:3181
 vhci_release+0x6b/0xe0 drivers/bluetooth/hci_vhci.c:354
 __fput+0x232/0x780 fs/file_table.c:209
 ____fput+0x9/0x10 fs/file_table.c:243
 task_work_run+0x111/0x180 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9f7/0x2aa0 kernel/exit.c:865
 do_group_exit+0xf8/0x2c0 kernel/exit.c:968
 get_signal+0x56c/0x1250 kernel/signal.c:2468
 do_signal+0x87/0x1850 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x154/0x1e0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x47a/0x540 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x48a7a1
Code: Bad RIP value.
RSP: 002b:00007fffeb2d48c0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 00000000000009d5 RCX: 000000000048a7a1
RDX: 00007fffeb2d4900 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffeb2d499c R08: 0000000000000000 R09: 0000006b9c99523b
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000006118b R14: 0000000000000003 R15: 00007fffeb2d4a00
Modules linked in:
---[ end trace 5777bcbe2446e968 ]---
RIP: 0010:klist_next+0x48/0x3e0 lib/klist.c:377
Code: 48 89 fb 48 83 ec 10 80 3c 02 00 0f 85 ce 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 8d 7c 24 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a1 02 00 00 4c 8d 6b 08 4d 8b 7c 24 50 48 b8 00 
RSP: 0018:ffff8800b01376f0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8800b0137768 RCX: ffffffff813c8f13
RDX: 000000000000000a RSI: ffff8800b0137768 RDI: 0000000000000050
RBP: ffff8800b0137728 R08: ffffed001574594d R09: ffffed001574594c
R10: ffffed001574594c R11: ffff8800aba2ca63 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff86bb9860 R15: dffffc0000000000
FS:  00000000028da400(0000) GS:ffff8800ba600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff3d195d18 CR3: 00000000a4132000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400