list_del corruption. prev->next should be ffff88017fef7b80, but was ffff8801bfbbf7c8
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13286 Comm: syz-executor4 Not tainted 4.20.0-rc1-next-20181109+ #110
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51
Code: fe 60 88 e8 72 9b d3 fd 0f 0b 48 89 de 48 c7 c7 40 00 61 88 e8 61 9b d3 fd 0f 0b 48 89 de 48 c7 c7 e0 ff 60 88 e8 50 9b d3 fd <0f> 0b 48 89 d9 48 c7 c7 a0 00 61 88 e8 3f 9b d3 fd 0f 0b 48 89 f1
RSP: 0018:ffff88017fef7970 EFLAGS: 00010286
RAX: 0000000000000054 RBX: ffff88017fef7b80 RCX: ffffc9000e247000
RDX: 0000000000000000 RSI: ffffffff8165ba15 RDI: 0000000000000005
RBP: ffff88017fef7988 R08: ffff8801d2c082c0 R09: ffffed003b5c5020
R10: ffffed003b5c5020 R11: ffff8801dae28107 R12: ffff880180467b70
R13: ffff880180467b70 R14: 0000000000000000 R15: ffff88017fef7a58
FS:  00007ff75370c700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001d7e35000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del_init include/linux/list.h:159 [inline]
 __locks_delete_block fs/locks.c:683 [inline]
 locks_delete_block+0xce/0x3d0 fs/locks.c:716
 locks_mandatory_area+0x48b/0x6a0 fs/locks.c:1398
 rw_verify_area+0x2f2/0x360 fs/read_write.c:386
 vfs_write+0x149/0x560 fs/read_write.c:544
 ksys_write+0x101/0x260 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 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:00007ff75370bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000018 RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff75370c6d4
R13: 00000000004c556b R14: 00000000004d9030 R15: 00000000ffffffff
Modules linked in:
---[ end trace 3b1c456531599f8d ]---
RIP: 0010:__list_del_entry_valid.cold.1+0x48/0x4a lib/list_debug.c:51
Code: fe 60 88 e8 72 9b d3 fd 0f 0b 48 89 de 48 c7 c7 40 00 61 88 e8 61 9b d3 fd 0f 0b 48 89 de 48 c7 c7 e0 ff 60 88 e8 50 9b d3 fd <0f> 0b 48 89 d9 48 c7 c7 a0 00 61 88 e8 3f 9b d3 fd 0f 0b 48 89 f1
RSP: 0018:ffff88017fef7970 EFLAGS: 00010286
RAX: 0000000000000054 RBX: ffff88017fef7b80 RCX: ffffc9000e247000
RDX: 0000000000000000 RSI: ffffffff8165ba15 RDI: 0000000000000005
RBP: ffff88017fef7988 R08: ffff8801d2c082c0 R09: ffffed003b5c5020
R10: ffffed003b5c5020 R11: ffff8801dae28107 R12: ffff880180467b70
R13: ffff880180467b70 R14: 0000000000000000 R15: ffff88017fef7a58
FS:  00007ff75370c700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000001d7e35000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600