raw: 02fffc000004006c ffffea0006fefb88 ffffea00071827c8 ffff8801cdc63cb1
raw: 000000000000072b 0000000000000000 0000000200000000 ffff8801c9d8e680
page dumped because: VM_BUG_ON_PAGE(page_to_pgoff(page) != index)
page->mem_cgroup:ffff8801c9d8e680
------------[ cut here ]------------
kernel BUG at mm/shmem.c:815!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 1 PID: 10032 Comm: syz-executor5 Not tainted 4.18.0-rc3-next-20180706+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:shmem_undo_range+0xdaa/0x29a0 mm/shmem.c:815
Code: 00 0f 85 bd 19 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a5 f0 d6 ff 48 c7 c6 e0 32 f1 87 4c 89 e7 e8 16 10 05 00 <0f> 0b e8 8f f0 d6 ff 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 80 3c 18 
RSP: 0018:ffff88019aadedc8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff81aaab95 RDI: ffffed003355bda8
RBP: ffff88019aadf540 R08: 0000000000200000 R09: 0000000000005d3d
R10: 00000000000ba7a8 R11: 00000000000174f0 R12: ffffea0006f42100
R13: ffff88019aadf518 R14: 0000000000000001 R15: 000000000000072b
FS:  00007fc1d2440700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c9020 CR3: 00000001ab7d5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 shmem_truncate_range+0x27/0xa0 mm/shmem.c:971
 shmem_setattr+0xa92/0xda0 mm/shmem.c:1030
 notify_change+0xc0c/0x10f0 fs/attr.c:333
 do_truncate+0x1ac/0x2b0 fs/open.c:63
 handle_truncate fs/namei.c:3030 [inline]
 do_last fs/namei.c:3455 [inline]
 path_openat+0x38ca/0x5620 fs/namei.c:3587
 do_filp_open+0x255/0x380 fs/namei.c:3621
 do_sys_open+0x584/0x720 fs/open.c:1106
 ksys_open include/linux/syscalls.h:1285 [inline]
 __do_sys_creat fs/open.c:1164 [inline]
 __se_sys_creat fs/open.c:1162 [inline]
 __x64_sys_creat+0x61/0x80 fs/open.c:1162
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455e29
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fc1d243fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fc1d24406d4 RCX: 0000000000455e29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bbd75 R14: 00000000004c9188 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 3b98b871f699cfd1 ]---
RIP: 0010:shmem_undo_range+0xdaa/0x29a0 mm/shmem.c:815
Code: 00 0f 85 bd 19 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a5 f0 d6 ff 48 c7 c6 e0 32 f1 87 4c 89 e7 e8 16 10 05 00 <0f> 0b e8 8f f0 d6 ff 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 80 3c 18 
RSP: 0018:ffff88019aadedc8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff81aaab95 RDI: ffffed003355bda8
RBP: ffff88019aadf540 R08: 0000000000200000 R09: 0000000000005d3d
R10: 00000000000ba7a8 R11: 00000000000174f0 R12: ffffea0006f42100
R13: ffff88019aadf518 R14: 0000000000000001 R15: 000000000000072b
FS:  00007fc1d2440700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c9020 CR3: 00000001ab7d5000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400