kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 16250 Comm: syz-executor5 Not tainted 4.19.0-rc2-next-20180904+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8801413df858 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801c7d6a700 RCX: ffffc90004683000
RDX: 0000000000000000 RSI: ffffffff827def4a RDI: 0000000000000001
RBP: ffff8801413df8b0 R08: ffff8801880d0600 R09: ffffed003b6246de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801c7d6a720 R14: fffffffffffffff4 R15: ffff8801c7d6a700
FS:  00007fa206ce1700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e326000 CR3: 000000018c731000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ovl_fill_super+0x4f4/0x3ff9 fs/overlayfs/super.c:1510
 mount_nodev+0x73/0x120 fs/super.c:1393
 ovl_mount+0x34/0x40 fs/overlayfs/super.c:1519
 legacy_get_tree+0x131/0x460 fs/fs_context.c:732
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746
 do_new_mount fs/namespace.c:2627 [inline]
 do_mount+0x6f9/0x1e30 fs/namespace.c:2951
 ksys_mount+0x12d/0x140 fs/namespace.c:3167
 __do_sys_mount fs/namespace.c:3181 [inline]
 __se_sys_mount fs/namespace.c:3178 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa206ce0c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa206ce16d4 RCX: 0000000000457099
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000000400000
RBP: 0000000000930140 R08: 0000000020000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007
R13: 00000000004d3300 R14: 00000000004c8241 R15: 0000000000000033
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace b13a46d3a1e78977 ]---
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8801413df858 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801c7d6a700 RCX: ffffc90004683000
RDX: 0000000000000000 RSI: ffffffff827def4a RDI: 0000000000000001
RBP: ffff8801413df8b0 R08: ffff8801880d0600 R09: ffffed003b6246de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801c7d6a720 R14: fffffffffffffff4 R15: ffff8801c7d6a700
FS:  00007fa206ce1700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e326000 CR3: 000000018c731000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400