overlayfs: filesystem on './file0' not supported as upperdir
WARNING: CPU: 0 PID: 10451 at fs/overlayfs/dir.c:263 ovl_instantiate+0x293/0x2f0 fs/overlayfs/dir.c:263
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 10451 Comm: syz-executor.1 Not tainted 4.19.35 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x263/0x51d kernel/panic.c:185
 __warn.cold+0x20/0x54 kernel/panic.c:540
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:997
RIP: 0010:ovl_instantiate+0x293/0x2f0 fs/overlayfs/dir.c:263
Code: 04 31 ff 89 c3 89 c6 e8 2b 64 1f ff 85 db 75 63 e8 a2 62 1f ff 4c 89 e7 45 31 e4 e8 57 8b 64 ff e9 20 ff ff ff e8 8d 62 1f ff <0f> 0b 41 89 dc e9 11 ff ff ff e8 7e 62 1f ff 0f 0b eb 86 48 89 85
RSP: 0018:ffff88805d2bfaa0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffffffffffffff8c RCX: ffffc90008080000
RDX: 000000000000a8d4 RSI: ffffffff824bd283 RDI: 0000000000000007
RBP: ffff88805d2bfb78 R08: ffff888081eee200 R09: ffffed100ba57f2d
R10: ffffed100ba57f2c R11: 0000000000000003 R12: ffff88801da2b080
R13: ffff88801da2b340 R14: 0000000000000000 R15: ffff88805d2bfb50
 ovl_create_over_whiteout fs/overlayfs/dir.c:519 [inline]
 ovl_create_or_link+0xac3/0x1210 fs/overlayfs/dir.c:583
 ovl_create_object+0x231/0x2c0 fs/overlayfs/dir.c:617
 ovl_symlink+0x25/0x30 fs/overlayfs/dir.c:652
 vfs_symlink fs/namei.c:4126 [inline]
 vfs_symlink+0x378/0x5d0 fs/namei.c:4112
 do_symlinkat+0x22b/0x290 fs/namei.c:4153
 __do_sys_symlink fs/namei.c:4172 [inline]
 __se_sys_symlink fs/namei.c:4170 [inline]
 __x64_sys_symlink+0x59/0x80 fs/namei.c:4170
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5ebe1b9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000458c29
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000040
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5ebe1ba6d4
R13: 00000000004c74d3 R14: 00000000004dd3a0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..