ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
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: 1 PID: 31509 Comm: syz-executor.3 Not tainted 4.19.196-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:klist_next+0x48/0x450 lib/klist.c:378
Code: 48 89 fb 48 83 ec 18 80 3c 02 00 0f 85 e1 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 b4 02 00 00 4c 8d 6b 08 4d 8b 7c 24 50 48 b8 00
RSP: 0018:ffff8880b361f698 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8880b361f718 RCX: ffffffff87a3e038
RDX: 000000000000000a RSI: ffff8880b361f718 RDI: 0000000000000050
RBP: ffff8880b361f6d8 R08: fffffbfff13301ea R09: fffffbfff13301e9
R10: fffffbfff13301e9 R11: ffffffff89980f4f R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff86d8c400 R15: dffffc0000000000
FS:  00007fb4d87cd700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ca0115e980 CR3: 000000009c232000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 next_device drivers/base/core.c:2397 [inline]
 device_find_child+0xb1/0x170 drivers/base/core.c:2540
 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:1513
 hci_dev_do_close+0x57e/0xe10 net/bluetooth/hci_core.c:1673
 hci_unregister_dev+0x167/0x890 net/bluetooth/hci_core.c:3278
 vhci_release+0x6b/0xe0 drivers/bluetooth/hci_vhci.c:354
 __fput+0x249/0x7f0 fs/file_table.c:278
 ____fput+0x9/0x10 fs/file_table.c:309
 task_work_run+0x108/0x180 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xa6a/0x2d90 kernel/exit.c:870
 do_group_exit+0xf8/0x2c0 kernel/exit.c:967
 get_signal+0x30b/0x1970 kernel/signal.c:2589
 do_signal+0x87/0x1870 arch/x86/kernel/signal.c:799
 exit_to_usermode_loop+0x159/0x1e0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465af9
Code: Bad RIP value.
RSP: 002b:00007fb4d87cd188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffff0 RBX: 000000000056bf60 RCX: 0000000000465af9
RDX: 0000000000000008 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00000000004b0682 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fffc9757c3f R14: 00007fb4d87cd300 R15: 0000000000022000
Modules linked in:
---[ end trace dc57e154fa8322e6 ]---
RIP: 0010:klist_next+0x48/0x450 lib/klist.c:378
Code: 48 89 fb 48 83 ec 18 80 3c 02 00 0f 85 e1 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 b4 02 00 00 4c 8d 6b 08 4d 8b 7c 24 50 48 b8 00
RSP: 0018:ffff8880b361f698 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8880b361f718 RCX: ffffffff87a3e038
RDX: 000000000000000a RSI: ffff8880b361f718 RDI: 0000000000000050
RBP: ffff8880b361f6d8 R08: fffffbfff13301ea R09: fffffbfff13301e9
R10: fffffbfff13301e9 R11: ffffffff89980f4f R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff86d8c400 R15: dffffc0000000000
FS:  00007fb4d87cd700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000465acf CR3: 000000009c232000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400