overlayfs: filesystem on './file0' not supported as upperdir
WARNING: CPU: 1 PID: 12214 at fs/overlayfs/dir.c:263 ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 12214 Comm: syz-executor0 Not tainted 4.20.0+ #389
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+0x1d3/0x2c6 lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263
Code: c3 89 c6 e8 39 8e f1 fe 85 db 0f 85 9e 00 00 00 e8 1c 8d f1 fe 4c 89 e7 45 31 f6 e8 61 44 47 ff e9 ec fe ff ff e8 07 8d f1 fe <0f> 0b e9 e0 fe ff ff e8 fb 8c f1 fe 0f 0b e9 63 ff ff ff e8 3f 98
RSP: 0018:ffff8881879cf998 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff8881879cfa30 RCX: ffffc90005de9000
RDX: 0000000000001815 RSI: ffffffff828cd1f9 RDI: 0000000000000007
RBP: ffff8881879cfa58 R08: ffff888187c20080 R09: ffffed1030f39ee6
R10: ffffed1030f39ee6 R11: 0000000000000003 R12: ffff88817cdda460
R13: ffff8881879cf9d0 R14: ffffffffffffff8c R15: 0000000000000000
 ovl_create_over_whiteout fs/overlayfs/dir.c:518 [inline]
 ovl_create_or_link+0xad6/0x1560 fs/overlayfs/dir.c:582
 ovl_create_object+0x2e9/0x3a0 fs/overlayfs/dir.c:616
 ovl_mkdir+0x2b/0x30 fs/overlayfs/dir.c:635
 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3816
 do_mkdirat+0x27a/0x310 fs/namei.c:3839
 __do_sys_mkdirat fs/namei.c:3850 [inline]
 __se_sys_mkdirat fs/namei.c:3848 [inline]
 __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3848
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457759
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:00007f74cfd2fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457759
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f74cfd306d4
R13: 00000000004c320f R14: 00000000004d5bc8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..