BUG: unable to handle kernel paging request at fffffffffffffff4
PGD 926d067 P4D 926d067 PUD 926f067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8587 Comm: syz-executor0 Not tainted 4.19.0-rc8-next-20181016+ #95
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:parse_monolithic_mount_data fs/namespace.c:2369 [inline]
RIP: 0010:do_remount fs/namespace.c:2402 [inline]
RIP: 0010:do_mount+0xb98/0x1d90 fs/namespace.c:2965
Code: 06 00 48 89 c2 48 89 c3 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 11 00 00 48 b8 00 00 00 00 00 fc ff df <4c> 8b 33 49 8d 7e 18 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 11
RSP: 0018:ffff880182c6fc28 EFLAGS: 00010246
kobject: 'loop1' (00000000f0ce766c): kobject_uevent_env
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc90001e6a000
RDX: 1ffffffffffffffe RSI: ffffffff81df05fc RDI: 0000000000000282
RBP: ffff880182c6fdb0 R08: ffff880186ff4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b9906a30
R13: ffff8801833c8cc0 R14: ffff8801833c8cc0 R15: ffff8801d1db2c80
FS:  00007f982e815700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 00000001d2a35000 CR4: 00000000001406f0
kobject: 'loop1' (00000000f0ce766c): fill_kobj_path: path = '/devices/virtual/block/loop1'
Call Trace:
kobject: 'loop5' (000000004f237158): kobject_uevent_env
kobject: 'loop5' (000000004f237158): fill_kobj_path: path = '/devices/virtual/block/loop5'
 ksys_mount+0x12d/0x140 fs/namespace.c:3190
 __do_sys_mount fs/namespace.c:3204 [inline]
 __se_sys_mount fs/namespace.c:3201 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201
 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:00007f982e814c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
kobject: 'loop5' (000000004f237158): kobject_uevent_env
RAX: ffffffffffffffda RBX: 00007f982e814c90 RCX: 0000000000457569
RDX: 0000000020000140 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000072bf00 R08: 0000000020000300 R09: 0000000000000000
R10: 0000000000000020 R11: 0000000000000246 R12: 00007f982e8156d4
R13: 00000000004c28a1 R14: 00000000004d3c90 R15: 0000000000000003
Modules linked in:
CR2: fffffffffffffff4
---[ end trace 2e05b6a87254c183 ]---
RIP: 0010:parse_monolithic_mount_data fs/namespace.c:2369 [inline]
RIP: 0010:do_remount fs/namespace.c:2402 [inline]
RIP: 0010:do_mount+0xb98/0x1d90 fs/namespace.c:2965
kobject: 'loop5' (000000004f237158): fill_kobj_path: path = '/devices/virtual/block/loop5'
Code: 06 00 48 89 c2 48 89 c3 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 11 00 00 48 b8 00 00 00 00 00 fc ff df <4c> 8b 33 49 8d 7e 18 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 5e 11
RSP: 0018:ffff880182c6fc28 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffc90001e6a000
RDX: 1ffffffffffffffe RSI: ffffffff81df05fc RDI: 0000000000000282
RBP: ffff880182c6fdb0 R08: ffff880186ff4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b9906a30
R13: ffff8801833c8cc0 R14: ffff8801833c8cc0 R15: ffff8801d1db2c80
kobject: 'loop2' (00000000d474afb4): kobject_uevent_env
FS:  00007f982e815700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff4 CR3: 00000001d2a35000 CR4: 00000000001406f0