F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0)
BUG: unable to handle kernel NULL pointer dereference at           (null)
F2FS-fs (loop2): Can't find valid F2FS filesystem in 2th superblock
IP:           (null)
PGD 7c65c067 P4D 7c65c067 PUD 90e40067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7093 Comm: syz-executor.3 Not tainted 4.14.151 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888065424180 task.stack: ffff888065430000
RIP: 0010:          (null)
RSP: 0018:ffff888065437d48 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff88151060 RCX: ffffc9000ae45000
RDX: 1ffffffff102a223 RSI: 0000000000000000 RDI: ffff88809bd71000
RBP: ffff888065437d68 R08: 0000000000000001 R09: ffff888065424a20
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809bd71000
R13: ffff88809bd7100e R14: 000000000000001c R15: 0000000000000802
FS:  00007f4d1422b700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000091d15000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 inet_autobind+0xae/0x180 net/ipv4/af_inet.c:181
 inet_dgram_connect+0x136/0x1e0 net/ipv4/af_inet.c:538
XFS (loop1): Invalid superblock magic number
 SYSC_connect+0x1f6/0x2d0 net/socket.c:1655
 SyS_connect+0x24/0x30 net/socket.c:1636
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
kobject: 'loop5' (ffff8880a4b20220): kobject_uevent_env
RIP: 0033:0x45a219
RSP: 002b:00007f4d1422ac78 EFLAGS: 00000246
kobject: 'loop5' (ffff8880a4b20220): fill_kobj_path: path = '/devices/virtual/block/loop5'
 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a219
RDX: 000000000000001c RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4d1422b6d4
R13: 00000000004c09aa R14: 00000000004d3358 R15: 00000000ffffffff
Code: 
kobject: 'loop5' (ffff8880a4b20220): kobject_uevent_env
 Bad RIP value.
kobject: 'loop5' (ffff8880a4b20220): fill_kobj_path: path = '/devices/virtual/block/loop5'
RIP:           (null) RSP: ffff888065437d48
CR2: 0000000000000000
---[ end trace b0916c4aab05b4ae ]---
kobject: 'loop0' (ffff8880a49a6f20): kobject_uevent_env