overlayfs: workdir and upperdir must reside under the same mount
WARNING: CPU: 0 PID: 7984 at fs/overlayfs/dir.c:1176 ovl_rename+0x159c/0x1940 fs/overlayfs/dir.c:1176
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7984 Comm: syz-executor.0 Not tainted 5.1.0-rc6+ #89
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+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x45 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:ovl_rename+0x159c/0x1940 fs/overlayfs/dir.c:1176
Code: 80 00 00 00 e8 45 f7 19 ff 8b b4 24 80 00 00 00 85 f6 0f 85 cd f6 ff ff e8 b1 f5 19 ff 4c 89 f7 e9 a5 f6 ff ff e8 a4 f5 19 ff <0f> 0b e9 a4 f3 ff ff e8 98 f5 19 ff 48 8b 54 24 70 b8 ff ff 37 00
RSP: 0018:ffff8880a92afad8 EFLAGS: 00010293
RAX: ffff888085faa380 RBX: 0000000000000000 RCX: ffff888096e934a0
RDX: 0000000000000000 RSI: ffffffff8256970c RDI: ffff888096e934f8
RBP: ffff8880a92afbf8 R08: ffff888085faa380 R09: 0000000000000008
R10: ffffed1015d05bc7 R11: ffff8880ae82de3b R12: ffff888096e93e40
R13: 0000000000000000 R14: ffff888096e93340 R15: ffff8880a92afb90
 vfs_rename+0x803/0x1ac0 fs/namei.c:4475
 do_renameat2+0xb0f/0xc40 fs/namei.c:4625
 __do_sys_rename fs/namei.c:4671 [inline]
 __se_sys_rename fs/namei.c:4669 [inline]
 __x64_sys_rename+0x61/0x80 fs/namei.c:4669
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458da9
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:00007fe8b143dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000458da9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 00000000200000c0
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe8b143e6d4
R13: 00000000004c5d4c R14: 00000000004da328 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..