overlayfs: missing 'lowerdir' overlayfs: filesystem on './file0' not supported as upperdir WARNING: CPU: 0 PID: 22499 at fs/overlayfs/dir.c:263 ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 22499 Comm: syz-executor2 Not tainted 4.20.0+ #175 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/0x55f kernel/panic.c:189 __warn.cold.8+0x20/0x52 kernel/panic.c:544 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 overlayfs: missing 'lowerdir' Code: c3 89 c6 e8 89 6d f0 fe 85 db 0f 85 9e 00 00 00 e8 6c 6c f0 fe 4c 89 e7 45 31 f6 e8 31 fa 46 ff e9 ec fe ff ff e8 57 6c f0 fe <0f> 0b e9 e0 fe ff ff e8 4b 6c f0 fe 0f 0b e9 63 ff ff ff e8 af 50 RSP: 0018:ffff88805ecb79a8 EFLAGS: 00010212 RAX: 0000000000040000 RBX: ffff88805ecb7a40 RCX: ffffc90012e09000 RDX: 000000000000c9fe RSI: ffffffff82917fe9 RDI: 0000000000000007 RBP: ffff88805ecb7a68 R08: ffff8880506dc000 R09: ffffed100bd96ee8 R10: ffffed100bd96ee8 R11: 0000000000000003 R12: ffff888094f3f1a0 R13: ffff88805ecb79e0 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_symlink+0x24/0x30 fs/overlayfs/dir.c:651 vfs_symlink+0x37a/0x5d0 fs/namei.c:4126 do_symlinkat+0x242/0x2d0 fs/namei.c:4153 kobject: 'loop3' (00000000608eaf37): kobject_uevent_env __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 kobject: 'loop3' (00000000608eaf37): fill_kobj_path: path = '/devices/virtual/block/loop3' do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 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:00007f97da338c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000040 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f97da3396d4 R13: 00000000004c614e R14: 00000000004dadd0 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..