FAT-fs (loop3): Filesystem has been set read-only
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: 0 PID: 11647 Comm: syz-executor0 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:ffff88018c25f880 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
RBP: ffff88018c25fa60 R08: ffff8801854a2080 R09: ffffed003b5e5b67
R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff88018bd1dd40
R13: ffff88018c25f8f8 R14: 1ffff1003184bf13 R15: dffffc0000000000
FS:  0000000001c11940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33430000 CR3: 00000001cd8cd000 CR4: 00000000001426f0
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:00007ffd32460170 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000732a20 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd32460090 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 000000000000009e R15: 0000000000000000
Modules linked in:
kobject: 'kvm' (000000007f0972eb): kobject_uevent_env
kobject: 'kvm' (000000007f0972eb): kobject_uevent_env
kobject: 'kvm' (000000007f0972eb): fill_kobj_path: path = '/devices/virtual/misc/kvm'
---[ end trace 075a57c598a4dfd2 ]---
kobject: 'kvm' (000000007f0972eb): fill_kobj_path: path = '/devices/virtual/misc/kvm'
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
kobject: 'loop3' (000000003669c40a): kobject_uevent_env
kobject: 'loop3' (000000003669c40a): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'kvm' (000000007f0972eb): kobject_uevent_env
kobject: 'kvm' (000000007f0972eb): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop5' (00000000278b6836): kobject_uevent_env
kobject: 'loop5' (00000000278b6836): fill_kobj_path: path = '/devices/virtual/block/loop5'
RSP: 0018:ffff88018c25f880 EFLAGS: 00010202
kobject: 'loop1' (00000000d8a3879e): kobject_uevent_env
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
kobject: 'loop1' (00000000d8a3879e): fill_kobj_path: path = '/devices/virtual/block/loop1'
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
kobject: 'loop3' (000000003669c40a): kobject_uevent_env
RBP: ffff88018c25fa60 R08: ffff8801854a2080 R09: ffffed003b5e5b67
R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff88018bd1dd40
kobject: 'loop3' (000000003669c40a): fill_kobj_path: path = '/devices/virtual/block/loop3'
R13: ffff88018c25f8f8 R14: 1ffff1003184bf13 R15: dffffc0000000000
kobject: 'loop4' (000000003473f14d): kobject_uevent_env
FS:  0000000001c11940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
kobject: 'loop4' (000000003473f14d): fill_kobj_path: path = '/devices/virtual/block/loop4'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop2' (000000007ecdd80b): kobject_uevent_env
CR2: 0000000000707158 CR3: 00000001cd8cd000 CR4: 00000000001406e0
kobject: 'loop2' (000000007ecdd80b): fill_kobj_path: path = '/devices/virtual/block/loop2'