overlayfs: workdir and upperdir must reside under the same mount
overlayfs: fs on './file1' does not support file handles, falling back to index=off.
overlayfs: upper fs does not support tmpfile.
overlayfs: upper fs does not support xattr.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 31062 at fs/overlayfs/dir.c:1045 ovl_rename+0xc9d/0xeb0 fs/overlayfs/dir.c:1045
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 31062 Comm: syz-executor.2 Not tainted 4.14.114 #4
overlayfs: workdir and upperdir must reside under the same mount
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
overlayfs: workdir and upperdir must reside under the same mount
 panic+0x1f2/0x438 kernel/panic.c:182
 __warn.cold+0x2f/0x34 kernel/panic.c:546
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:944
RIP: 0010:ovl_rename+0xc9d/0xeb0 fs/overlayfs/dir.c:1045
RSP: 0018:ffff88808570fb68 EFLAGS: 00010297
RAX: ffff888096122180 RBX: ffff888087cd6040 RCX: 1ffff1101195a037
RDX: 0000000000000000 RSI: ffff88808cad0160 RDI: ffff88808cad01b8
RBP: ffff88808570fc50 R08: ffff888096122180 R09: 0000000000000007
R10: 0000000000000000 R11: ffff888096122180 R12: ffff88808ca63000
R13: ffff88807ecc5ca0 R14: 1ffff11010ae1f7d R15: 0000000000000000
 vfs_rename+0x556/0x17d0 fs/namei.c:4493
 SYSC_renameat2 fs/namei.c:4641 [inline]
 SyS_renameat2 fs/namei.c:4530 [inline]
 SYSC_rename fs/namei.c:4681 [inline]
 SyS_rename+0x610/0x6d0 fs/namei.c:4679
 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x458da9
RSP: 002b:00007fcab3d09c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 00000000200000c0
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcab3d0a6d4
R13: 00000000004c5d4c R14: 00000000004da328 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..