sctp: sctp_transport_update_pmtu: Reported pmtu 72 too low, using default minimum of 512
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
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
kobject: 'loop5' (00000000ba867fea): kobject_uevent_env
CPU: 0 PID: 9376 Comm: syz-executor3 Not tainted 4.20.0-rc1-next-20181109+ #110
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
kobject: 'loop5' (00000000ba867fea): fill_kobj_path: path = '/devices/virtual/block/loop5'
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
RSP: 0018:ffff88017ca575d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801c6b57000 RCX: ffffc90007fa6000
RDX: 0000000000000001 RSI: ffffffff81fa80ca RDI: 0000000000000008
RBP: ffff88017ca57618 R08: fffffbfff12d0189 R09: fffffbfff12d0188
kobject: 'loop1' (000000007547a48d): kobject_uevent_env
R10: fffffbfff12d0188 R11: ffffffff89680c47 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd9b1cc6700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000930004 CR3: 00000001ce5f9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'loop1' (000000007547a48d): fill_kobj_path: path = '/devices/virtual/block/loop1'
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: 'loop5' (00000000ba867fea): kobject_uevent_env
 create_dir lib/kobject.c:88 [inline]
 kobject_add_internal.cold.11+0x116/0x6af lib/kobject.c:247
kobject: 'loop5' (00000000ba867fea): fill_kobj_path: path = '/devices/virtual/block/loop5'
 kobject_add_varg lib/kobject.c:382 [inline]
 kobject_add+0x13f/0x1b0 lib/kobject.c:426
kobject: 'loop5' (00000000ba867fea): kobject_uevent_env
 device_add+0x445/0x18e0 drivers/base/core.c:1879
kobject: 'loop5' (00000000ba867fea): fill_kobj_path: path = '/devices/virtual/block/loop5'
 hci_register_dev+0x3b3/0x9c0 net/bluetooth/hci_core.c:3261
 __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+0x2de/0x470 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1867 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x6b8/0x9f0 fs/read_write.c:487
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
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:00007fd9b1cc5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000002 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd9b1cc66d4
R13: 00000000004c553b R14: 00000000004d8fe8 R15: 00000000ffffffff
Modules linked in:
---[ end trace ededb102d15c13e6 ]---
RIP: 0010:kernfs_add_one+0x342/0x4d0 fs/kernfs/dir.c:812
kobject: 'loop4' (000000001d501e0a): kobject_uevent_env
kobject: 'loop4' (000000001d501e0a): 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
RSP: 0018:ffff88017ca575d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801c6b57000 RCX: ffffc90007fa6000
RDX: 0000000000000001 RSI: ffffffff81fa80ca RDI: 0000000000000008
RBP: ffff88017ca57618 R08: fffffbfff12d0189 R09: fffffbfff12d0188
R10: fffffbfff12d0188 R11: ffffffff89680c47 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd9b1cc6700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffccd607ad0 CR3: 00000001ce5f9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400