overlayfs: filesystem on './file0' not supported as upperdir
WARNING: CPU: 0 PID: 31041 at fs/overlayfs/dir.c:263 ovl_instantiate+0x363/0x400 fs/overlayfs/dir.c:263
Kernel panic - not syncing: panic_on_warn set ...
kobject: 'loop1' (000000004d0d8c33): kobject_uevent_env
CPU: 0 PID: 31041 Comm: syz-executor5 Not tainted 5.0.0-rc4+ #51
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
kobject: 'loop1' (000000004d0d8c33): fill_kobj_path: path = '/devices/virtual/block/loop1'
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x48 kernel/panic.c:571
 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+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:ovl_instantiate+0x363/0x400 fs/overlayfs/dir.c:263
Code: c3 89 c6 e8 3f 41 f0 fe 85 db 0f 85 a6 00 00 00 e8 b2 3f f0 fe 4c 89 e7 45 31 e4 e8 57 db 46 ff e9 ef fe ff ff e8 9d 3f f0 fe <0f> 0b 41 89 dc e9 e0 fe ff ff e8 8e 3f f0 fe 0f 0b e9 64 ff ff ff
RSP: 0018:ffff88804e9c79b8 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffffffffffffff8c RCX: ffffc90010c76000
RDX: 000000000000a0e7 RSI: ffffffff8291c4c3 RDI: 0000000000000007
RBP: ffff88804e9c7a98 R08: ffff88804c0fc040 R09: ffffed1009d38ef9
R10: ffffed1009d38ef8 R11: 0000000000000003 R12: ffff8880a68ef5c0
R13: ffff88804e9c7a70 R14: 0000000000000000 R15: ffff88804e9c79f0
 ovl_create_over_whiteout fs/overlayfs/dir.c:518 [inline]
 ovl_create_or_link+0xa92/0x1560 fs/overlayfs/dir.c:582
 ovl_create_object+0x2fa/0x3b0 fs/overlayfs/dir.c:616
 ovl_mkdir+0x28/0x30 fs/overlayfs/dir.c:635
 vfs_mkdir+0x433/0x690 fs/namei.c:3816
 do_mkdirat+0x271/0x2f0 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+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458089
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f60e64eac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458089
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000008
RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f60e64eb6d4
R13: 00000000004c3d42 R14: 00000000004d6d18 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..