kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12509 Comm: &¤)^! Not tainted 4.20.0+ #395
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kernfs_add_one+0x342/0x4d0 fs/kernfs/dir.c:812
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 49 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d 70 49 8d 7d 08 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 16 01 00 00 45 8b 6d 08 31 ff
kobject: 'bluetooth' (0000000064be5b38): kobject_add_internal: parent: 'virtual', set: '(null)'
RSP: 0018:ffff88805d96f048 EFLAGS: 00010202
kobject: 'hci0' (000000004244497c): kobject_add_internal: parent: 'bluetooth', set: 'devices'
RAX: dffffc0000000000 RBX: ffff888089616a80 RCX: ffffc90007df1000
RDX: 0000000000000001 RSI: ffffffff81fb530a RDI: 0000000000000008
RBP: ffff88805d96f090 R08: fffffbfff131031d R09: fffffbfff131031c
R10: fffffbfff131031c R11: ffffffff898818e7 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fc6a0557700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a4fd98 CR3: 000000008e0d1000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 kernfs_create_dir_ns+0xf6/0x160 fs/kernfs/dir.c:1031
 sysfs_create_dir_ns+0x19b/0x340 fs/sysfs/dir.c:58
kobject: 'loop0' (00000000cf895c14): kobject_uevent_env
 create_dir lib/kobject.c:88 [inline]
 kobject_add_internal.cold.11+0x116/0x6af lib/kobject.c:247
 kobject_add_varg lib/kobject.c:382 [inline]
 kobject_add+0x13f/0x1b0 lib/kobject.c:426
kobject: 'hci0' (000000004244497c): kobject_uevent_env
 device_add+0x445/0x18f0 drivers/base/core.c:1912
 hci_register_dev+0x3b3/0x9c0 net/bluetooth/hci_core.c:3261
kobject: 'loop0' (00000000cf895c14): fill_kobj_path: path = '/devices/virtual/block/loop0'
 __vhci_create_device+0x2c1/0x580 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+0x2d8/0x470 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1862 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x72c/0xab0 fs/read_write.c:487
 __kernel_write+0x10c/0x390 fs/read_write.c:506
 write_pipe_buf+0x180/0x240 fs/splice.c:797
 splice_from_pipe_feed fs/splice.c:503 [inline]
 __splice_from_pipe+0x38b/0x7c0 fs/splice.c:627
 splice_from_pipe+0x1ec/0x340 fs/splice.c:662
 default_file_splice_write+0x3c/0x90 fs/splice.c:809
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x128/0x190 fs/splice.c:1023
 splice_direct_to_actor+0x3ad/0x9d0 fs/splice.c:978
 do_splice_direct+0x2d4/0x420 fs/splice.c:1066
 do_sendfile+0x62a/0xe50 fs/read_write.c:1439
 __do_sys_sendfile64 fs/read_write.c:1494 [inline]
 __se_sys_sendfile64 fs/read_write.c:1486 [inline]
 __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1486
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4579b9
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc6a0556c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004579b9
RDX: 0000000020d83ff8 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 00007fc6a05576d4
R13: 00000000004c471e R14: 00000000004d7d10 R15: 00000000ffffffff
Modules linked in:
kobject: 'hci0' (000000004244497c): fill_kobj_path: path = '/devices/virtual/bluetooth/hci0'
kobject: 'rfkill66' (00000000311b4796): kobject_add_internal: parent: 'hci0', set: 'devices'
kobject: 'loop2' (0000000052a4c9d6): kobject_uevent_env
kobject: 'rfkill66' (00000000311b4796): kobject_uevent_env
kobject: 'loop2' (0000000052a4c9d6): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'rfkill66' (00000000311b4796): fill_kobj_path: path = '/devices/virtual/bluetooth/hci0/rfkill66'
kobject: 'loop2' (0000000052a4c9d6): kobject_uevent_env
kobject: 'loop2' (0000000052a4c9d6): fill_kobj_path: path = '/devices/virtual/block/loop2'
---[ end trace c1485102f37850e3 ]---
kobject: 'loop4' (00000000eef90bb3): kobject_uevent_env
kobject: 'rfkill66' (00000000311b4796): kobject_uevent_env
RIP: 0010:kernfs_add_one+0x342/0x4d0 fs/kernfs/dir.c:812
kobject: 'loop4' (00000000eef90bb3): fill_kobj_path: path = '/devices/virtual/block/loop4'
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 49 01 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d 70 49 8d 7d 08 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 16 01 00 00 45 8b 6d 08 31 ff
kobject: 'rfkill66' (00000000311b4796): fill_kobj_path: path = '/devices/virtual/bluetooth/hci0/rfkill66'
kobject: 'loop2' (0000000052a4c9d6): kobject_uevent_env
kobject: 'loop2' (0000000052a4c9d6): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'rfkill66' (00000000311b4796): kobject_cleanup, parent           (null)
kobject: 'rfkill66' (00000000311b4796): calling ktype release
RSP: 0018:ffff88805d96f048 EFLAGS: 00010202
kobject: 'rfkill66': free name
kobject: 'hci0' (000000004244497c): kobject_uevent_env
RAX: dffffc0000000000 RBX: ffff888089616a80 RCX: ffffc90007df1000
kobject: 'hci0' (000000004244497c): fill_kobj_path: path = '/devices/virtual/bluetooth/hci0'
kobject: 'loop3' (00000000de401835): kobject_uevent_env
RDX: 0000000000000001 RSI: ffffffff81fb530a RDI: 0000000000000008
kobject: 'loop3' (00000000de401835): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'bluetooth' (0000000064be5b38): kobject_cleanup, parent           (null)
kobject: 'bluetooth' (0000000064be5b38): calling ktype release
kobject: 'loop0' (00000000cf895c14): kobject_uevent_env
RBP: ffff88805d96f090 R08: fffffbfff131031d R09: fffffbfff131031c
kobject: 'loop0' (00000000cf895c14): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'bluetooth': free name
R10: fffffbfff131031c R11: ffffffff898818e7 R12: 0000000000000000
kobject: 'hci0' (000000004244497c): kobject_cleanup, parent           (null)
kobject: 'hci0' (000000004244497c): calling ktype release
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
kobject: 'hci0': free name
FS:  00007fc6a0557700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 000000008e0d1000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'loop5' (00000000098aa192): kobject_uevent_env
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
kobject: 'loop5' (00000000098aa192): fill_kobj_path: path = '/devices/virtual/block/loop5'