kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 15256 Comm: syz-executor.4 Not tainted 5.2.0-rc6+ #38
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kernfs_add_one+0x343/0x4d0 fs/kernfs/dir.c:813
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 52 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 70 48 8d 7b 08 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 1f 01 00 00 8b 5b 08 31 ff 83
RSP: 0018:ffff88805eee7828 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000e685000
RDX: 0000000000000001 RSI: ffffffff81d76aab RDI: 0000000000000008
RBP: ffff88805eee7868 R08: 1ffffffff1192454 R09: fffffbfff1192455
R10: fffffbfff1192454 R11: ffffffff88c922a7 R12: ffff8880860808c0
R13: ffff8880860808c0 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7974993700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a0657a000 CR3: 000000007305d000 CR4: 00000000001406e0
Call Trace:
 kernfs_create_dir_ns+0xff/0x160 fs/kernfs/dir.c:1032
 sysfs_create_dir_ns+0x131/0x2a0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal lib/kobject.c:255 [inline]
 kobject_add_internal.cold+0x116/0x662 lib/kobject.c:225
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_add+0x150/0x1c0 lib/kobject.c:442
 device_add+0x3b7/0x17a0 drivers/base/core.c:2062
 hci_register_dev+0x2e8/0x860 net/bluetooth/hci_core.c:3305
 __vhci_create_device+0x2d0/0x5a0 drivers/bluetooth/hci_vhci.c:124
 vhci_create_device drivers/bluetooth/hci_vhci.c:148 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:204 [inline]
 vhci_write+0x2d0/0x470 drivers/bluetooth/hci_vhci.c:284
 call_write_iter include/linux/fs.h:1872 [inline]
 new_sync_write+0x4d3/0x770 fs/read_write.c:483
 __vfs_write+0xe1/0x110 fs/read_write.c:496
 vfs_write+0x20c/0x580 fs/read_write.c:558
 ksys_write+0x14f/0x290 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:620
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459519
Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7974992c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519
RDX: 0000000000000002 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f79749936d4
R13: 00000000004c95ff R14: 00000000004e0958 R15: 00000000ffffffff
Modules linked in:
---[ end trace 5a40ae85a666ff15 ]---
RIP: 0010:kernfs_add_one+0x343/0x4d0 fs/kernfs/dir.c:813
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 52 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 70 48 8d 7b 08 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 1f 01 00 00 8b 5b 08 31 ff 83
RSP: 0018:ffff88805eee7828 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000e685000
RDX: 0000000000000001 RSI: ffffffff81d76aab RDI: 0000000000000008
RBP: ffff88805eee7868 R08: 1ffffffff1192454 R09: fffffbfff1192455
R10: fffffbfff1192454 R11: ffffffff88c922a7 R12: ffff8880860808c0
R13: ffff8880860808c0 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7974993700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001ba0010 CR3: 000000007305d000 CR4: 00000000001406f0