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: 14313 Comm: syz-executor3 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:ffff8801bf31f880 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
RBP: ffff8801bf31fa60 R08: ffff8801cd552600 R09: ffffed003b5c5b67
R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801d5fa90c0
R13: ffff8801bf31f8f8 R14: 1ffff10037e63f13 R15: dffffc0000000000
FS:  00000000018a5940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f024000 CR3: 00000001b936d000 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
 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:00007fff755b7020 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000732ea0 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff755b6f40 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000000ef R15: 0000000000000003
Modules linked in:
kobject: 'nullb0' (000000006bde6bd0): kobject_uevent_env
---[ end trace 7de4ee95a4d78260 ]---
kobject: 'nullb0' (000000006bde6bd0): fill_kobj_path: path = '/devices/virtual/block/nullb0'
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: 'loop1' (000000008b31fdbf): kobject_uevent_env
kobject: 'loop1' (000000008b31fdbf): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'loop2' (00000000b635090f): kobject_uevent_env
kobject: 'loop2' (00000000b635090f): fill_kobj_path: path = '/devices/virtual/block/loop2'
RSP: 0018:ffff8801bf31f880 EFLAGS: 00010202
kobject: 'loop5' (00000000639f0c00): kobject_uevent_env
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
kobject: 'loop5' (00000000639f0c00): fill_kobj_path: path = '/devices/virtual/block/loop5'
kobject: 'loop2' (00000000b635090f): kobject_uevent_env
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
kobject: 'loop2' (00000000b635090f): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'rx-0' (00000000b3ada136): kobject_cleanup, parent 00000000477d051d
kobject: 'rx-0' (00000000b3ada136): auto cleanup 'remove' event
RBP: ffff8801bf31fa60 R08: ffff8801cd552600 R09: ffffed003b5c5b67
kobject: 'rx-0' (00000000b3ada136): kobject_uevent_env
kobject: 'rx-0' (00000000b3ada136): kobject_uevent_env: uevent_suppress caused the event to drop!
R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801d5fa90c0
kobject: 'rx-0' (00000000b3ada136): auto cleanup kobject_del
R13: ffff8801bf31f8f8 R14: 1ffff10037e63f13 R15: dffffc0000000000
kobject: 'rx-0' (00000000b3ada136): calling ktype release
kobject: 'rx-0': free name
kobject: 'loop2' (00000000b635090f): kobject_uevent_env
kobject: 'tx-0' (00000000828c919f): kobject_cleanup, parent 00000000477d051d
kobject: 'loop2' (00000000b635090f): fill_kobj_path: path = '/devices/virtual/block/loop2'
FS:  00000000018a5940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
kobject: 'tx-0' (00000000828c919f): auto cleanup 'remove' event
kobject: 'loop2' (00000000b635090f): kobject_uevent_env
kobject: 'loop2' (00000000b635090f): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'tx-0' (00000000828c919f): kobject_uevent_env
ISO 9660 Extensions: Microsoft Joliet Level 3
isofs_fill_super: root inode is not a directory. Corrupted media?
kobject: 'tx-0' (00000000828c919f): kobject_uevent_env: uevent_suppress caused the event to drop!
kobject: 'loop1' (000000008b31fdbf): kobject_uevent_env
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'tx-0' (00000000828c919f): auto cleanup kobject_del
kobject: 'loop1' (000000008b31fdbf): fill_kobj_path: path = '/devices/virtual/block/loop1'
kobject: 'tx-0' (00000000828c919f): calling ktype release
CR2: 00007f9082d7b000 CR3: 00000001b936d000 CR4: 00000000001406f0
kobject: 'loop2' (00000000b635090f): kobject_uevent_env
kobject: 'loop2' (00000000b635090f): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'tx-0': free name
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'queues' (00000000477d051d): kobject_cleanup, parent           (null)
kobject: 'queues' (00000000477d051d): calling ktype release
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'queues' (00000000477d051d): kset_release