EXT4-fs warning (device loop4): ext4_fill_super:3598: metadata_csum and uninit_bg are redundant flags; please run fsck.
EXT4-fs (loop4): VFS: Found ext4 filesystem with unknown checksum algorithm.
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
CPU: 1 PID: 7302 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:locks_remove_flock+0x216/0x350 fs/locks.c:2567
Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40
RSP: 0018:ffff88017fe7f880 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
RBP: ffff88017fe7fa60 R08: ffff88017def26c0 R09: ffffed003b5c5b67
R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801bdbb9580
R13: ffff88017fe7f8f8 R14: 1ffff1002ffcff13 R15: dffffc0000000000
FS:  0000000001ee3940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d8638 CR3: 00000001be35d000 CR4: 00000000001406e0
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
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 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: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff39e09730 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000000000000000c RCX: 0000000000411021
RDX: 0000000000000000 RSI: 00000000007319e0 RDI: 000000000000000b
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff39e09650 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000002f6 R15: 0000000000000002
Modules linked in:
kobject: 'loop3' (000000006287c21a): kobject_uevent_env
kobject: 'loop3' (000000006287c21a): fill_kobj_path: path = '/devices/virtual/block/loop3'
---[ end trace 663f8fe733bc229d ]---
RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567
kobject: 'loop4' (00000000dd7a19b8): kobject_uevent_env
Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40
kobject: 'loop4' (00000000dd7a19b8): fill_kobj_path: path = '/devices/virtual/block/loop4'
RSP: 0018:ffff88017fe7f880 EFLAGS: 00010202
kobject: 'loop4' (00000000dd7a19b8): kobject_uevent_env
kobject: 'loop4' (00000000dd7a19b8): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000ea684785): kobject_uevent_env
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
kobject: 'loop4' (00000000dd7a19b8): kobject_uevent_env
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
kobject: 'loop4' (00000000dd7a19b8): fill_kobj_path: path = '/devices/virtual/block/loop4'
kobject: 'loop1' (00000000ea684785): fill_kobj_path: path = '/devices/virtual/block/loop1'
general protection fault: 0000 [#2] PREEMPT SMP KASAN
CPU: 1 PID: 7326 Comm: syz-executor5 Tainted: G      D           4.20.0-rc1-next-20181107+ #107
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567
Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40
RSP: 0018:ffff88018abf7880 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
RBP: ffff88018abf7a60 R08: ffff88018626c080 R09: fffffbfff1322588
R10: fffffbfff1322588 R11: ffffffff89912c43 R12: ffff8801bdf51800
R13: ffff88018abf78f8 R14: 1ffff1003157ef13 R15: dffffc0000000000
FS:  0000000002839940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c4d0a CR3: 000000017ee5c000 CR4: 00000000001406e0
Call Trace:
RBP: ffff88017fe7fa60 R08: ffff88017def26c0 R09: ffffed003b5c5b67
R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801bdbb9580
 locks_remove_file+0x148/0x5c0 fs/locks.c:2607
 __fput+0x2f0/0xa70 fs/file_table.c:271
R13: ffff88017fe7f8f8 R14: 1ffff1002ffcff13 R15: dffffc0000000000
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
FS:  0000000001ee3940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
 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: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
kasan: CONFIG_KASAN_INLINE enabled
RSP: 002b:00007ffedeaee2c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000732170 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffedeaee1e0 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000002c4 R15: 0000000000000005
Modules linked in:
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop0' (000000008910017d): kobject_uevent_env
EXT4-fs warning (device loop4): ext4_fill_super:3598: metadata_csum and uninit_bg are redundant flags; please run fsck.
kasan: GPF could be caused by NULL-ptr deref or user memory access
kobject: 'loop0' (000000008910017d): fill_kobj_path: path = '/devices/virtual/block/loop0'
general protection fault: 0000 [#3] PREEMPT SMP KASAN
EXT4-fs (loop4): VFS: Found ext4 filesystem with unknown checksum algorithm.
CPU: 0 PID: 7318 Comm: syz-executor2 Tainted: G      D           4.20.0-rc1-next-20181107+ #107
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567
kobject: 'loop3' (000000006287c21a): kobject_uevent_env
Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40
RSP: 0018:ffff88017f57f880 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 63f3b6660de58500 RCX: ffffc90006bac000
RDX: 0c7e76ccc1bcb0a1 RSI: ffffffff81ed5c71 RDI: 63f3b6660de58508
RBP: ffff88017f57fa60 R08: ffff88017d77e700 R09: ffffed003af70d26
R10: ffffed003af70d26 R11: ffff8801d7b86933 R12: ffff8801c5f17d00
R13: ffff88017f57f8f8 R14: 1ffff1002feaff13 R15: dffffc0000000000
FS:  00007fa34ec36700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
kobject: 'loop3' (000000006287c21a): fill_kobj_path: path = '/devices/virtual/block/loop3'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000021000000 CR3: 00000001be35d000 CR4: 00000000001406f0
Call Trace:
CR2: 00007ffca3ad98e8 CR3: 00000001be35d000 CR4: 00000000001406f0