FAT-fs (loop1): count of clusters too big (20979710)
FAT-fs (loop1): Can't find a valid FAT filesystem
kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle kernel paging request at ffff880183e1fbb8
PGD be01067 P4D be01067 PUD 1cdcd7063 PMD 8000000183e001e3 
Oops: 0011 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7471 Comm: syz-executor2 Not tainted 4.20.0-rc1-next-20181107+ #107
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0xffff880183e1fbb8
Code: ae 9d 86 3f 7c 30 00 f1 ff 1f d0 fc e1 83 01 88 ff ff f8 fd e1 83 01 88 ff ff 00 00 00 00 00 fc ff df 04 00 00 00 00 00 00 00 <78> fd e1 83 01 88 ff ff bc 9e 2b 81 ff ff ff ff f8 a8 75 bc 01 88
kobject: 'loop3' (0000000095f7eaaa): kobject_uevent_env
RSP: 0018:ffff880183e1f508 EFLAGS: 00010216
kobject: 'loop3' (0000000095f7eaaa): fill_kobj_path: path = '/devices/virtual/block/loop3'
RAX: 0000000000040000 RBX: ffff880183e1fbb8 RCX: ffffc90006571000
RDX: 0000000000000373 RSI: ffffffff81ed5c9e RDI: ffff880183e1f588
RBP: ffff880183e1f6f0 R08: ffff8801bc75a080 R09: ffffed003b5e5b67
R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801c1042d40
R13: ffff880183e1f588 R14: 1ffff100307c3ea5 R15: dffffc0000000000
FS:  00007fe969614700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff880183e1fbb8 CR3: 00000001b8aab000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 locks_remove_file+0x148/0x5c0 fs/locks.c:2607
 __fput+0x2f0/0xa70 fs/file_table.c:271
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 get_signal+0x1550/0x1970 kernel/signal.c:2347
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 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:00007fe969613c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000049
RAX: fffffffffffffe00 RBX: 0000000000000002 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe9696146d4
R13: 00000000004bdd9e R14: 00000000004ccdb8 R15: 00000000ffffffff
Modules linked in:
CR2: ffff880183e1fbb8
---[ end trace 6cbd226ad7e6c060 ]---
RIP: 0010:0xffff880183e1fbb8
Code: ae 9d 86 3f 7c 30 00 f1 ff 1f d0 fc e1 83 01 88 ff ff f8 fd e1 83 01 88 ff ff 00 00 00 00 00 fc ff df 04 00 00 00 00 00 00 00 <78> fd e1 83 01 88 ff ff bc 9e 2b 81 ff ff ff ff f8 a8 75 bc 01 88
RSP: 0018:ffff880183e1f508 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff880183e1fbb8 RCX: ffffc90006571000
RDX: 0000000000000373 RSI: ffffffff81ed5c9e RDI: ffff880183e1f588
RBP: ffff880183e1f6f0 R08: ffff8801bc75a080 R09: ffffed003b5e5b67
R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801c1042d40
R13: ffff880183e1f588 R14: 1ffff100307c3ea5 R15: dffffc0000000000
FS:  00007fe969614700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff880183e1fbb8 CR3: 00000001b8aab000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400