FAT-fs (loop4): bogus number of reserved sectors
FAT-fs (loop4): Can't find a valid FAT filesystem
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 877e1067 P4D 877e1067 PUD 877e2067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 16355 Comm: syz-executor.2 Not tainted 4.19.144-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
RIP: 0010:do_syscall_64+0x19c/0x620 arch/x86/entry/common.c:296
Code: 03 00 00 e8 56 18 69 00 9c 58 0f 1f 44 00 00 25 00 02 00 00 31 ff 48 89 c3 48 89 c6 e8 cd 19 69 00 48 85 db 0f 84 00 03 00 00 <00> 00 00 00 00 44 89 e3 31 ff 81 e3 91 00 00 10 89 de e8 8d 19 69
RSP: 0018:ffff88808475ff28 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff81009993
RDX: 0000000000000200 RSI: ffff888052128300 RDI: 0000000000000007
RBP: ffff88808475ff58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88d25b58 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000002229940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000877e0000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45ba81
Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 84 cf fb ff c3 48 83 ec 08 e8 ea 46 00 00 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 47 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe2e5e15f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: 0000000000000000 RBX: 0000000000101ee5 RCX: 000000000045ba81
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffe2e5e1600
RBP: 0000000000000011 R08: 0000000000000000 R09: 0000000002229940
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffe2e5e1650 R14: 0000000000101ee5 R15: 00007ffe2e5e1660
Modules linked in:
CR2: 0000000000000000
---[ end trace 8187206020d9f872 ]---
RIP: 0010:syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
RIP: 0010:do_syscall_64+0x19c/0x620 arch/x86/entry/common.c:296
Code: 03 00 00 e8 56 18 69 00 9c 58 0f 1f 44 00 00 25 00 02 00 00 31 ff 48 89 c3 48 89 c6 e8 cd 19 69 00 48 85 db 0f 84 00 03 00 00 <00> 00 00 00 00 44 89 e3 31 ff 81 e3 91 00 00 10 89 de e8 8d 19 69
RSP: 0018:ffff88808475ff28 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffffffff81009993
RDX: 0000000000000200 RSI: ffff888052128300 RDI: 0000000000000007
RBP: ffff88808475ff58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88d25b58 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000002229940(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000877e0000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400