overlayfs: filesystem on './file0' not supported as upperdir
WARNING: CPU: 1 PID: 17504 at fs/overlayfs/dir.c:263 ovl_instantiate+0x363/0x400 fs/overlayfs/dir.c:263
kobject: 'loop2' (0000000052bf0215): kobject_uevent_env
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 17504 Comm: syz-executor0 Not tainted 4.20.0+ #1
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+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x589 kernel/panic.c:189
kobject: 'loop2' (0000000052bf0215): fill_kobj_path: path = '/devices/virtual/block/loop2'
 __warn.cold+0x20/0x4b kernel/panic.c:544
vhci_hcd: invalid port number 0
 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
vhci_hcd: invalid port number 0
 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 9f 0b f1 fe 85 db 0f 85 a6 00 00 00 e8 12 0a f1 fe 4c 89 e7 45 31 e4 e8 c7 28 47 ff e9 ef fe ff ff e8 fd 09 f1 fe <0f> 0b 41 89 dc e9 e0 fe ff ff e8 ee 09 f1 fe 0f 0b e9 64 ff ff ff
overlayfs: failed to resolve './file1': -2
RSP: 0018:ffff88806db0f9d0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffffffffffffff8c RCX: ffffc90006fda000
RDX: 0000000000001ca8 RSI: ffffffff82907d03 RDI: 0000000000000007
RBP: ffff88806db0fab0 R08: ffff88808bf8e680 R09: ffffed100db61efc
R10: ffffed100db61efb R11: 0000000000000003 R12: ffff8880969041a0
R13: ffff88806db0fa88 R14: 0000000000000000 R15: ffff88806db0fa08
cgroup: fork rejected by pids controller in /syz2
 ovl_create_over_whiteout fs/overlayfs/dir.c:518 [inline]
 ovl_create_or_link+0xa88/0x1560 fs/overlayfs/dir.c:582
 ovl_create_object+0x2fa/0x3b0 fs/overlayfs/dir.c:616
 ovl_symlink+0x25/0x30 fs/overlayfs/dir.c:651
 vfs_symlink fs/namei.c:4126 [inline]
 vfs_symlink+0x378/0x5d0 fs/namei.c:4112
 do_symlinkat+0x239/0x2c0 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+0x1a3/0x800 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:00007f89243dac78 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: 00007f89243db6d4
R13: 00000000004c61ae R14: 00000000004dafc0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..