overlayfs: workdir and upperdir must reside under the same mount overlayfs: workdir and upperdir must reside under the same mount kobject: 'loop5' (ffff8801259597e0): kobject_uevent_env kobject: 'loop5' (ffff8801259597e0): fill_kobj_path: path = '/devices/virtual/block/loop5' ------------[ cut here ]------------ WARNING: CPU: 1 PID: 15251 at fs/overlayfs/dir.c:1036 ovl_rename+0xcc9/0x1020 fs/overlayfs/dir.c:1022 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 15251 Comm: syz-executor.0 Not tainted 4.14.0-rc5+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x145/0x1e1 lib/dump_stack.c:52 panic+0x1a9/0x34e kernel/panic.c:181 __warn.cold.8+0x11a/0x156 kernel/panic.c:542 report_bug+0x1a3/0x227 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_trap_no_signal arch/x86/kernel/traps.c:212 [inline] do_trap+0x1ef/0x2d0 arch/x86/kernel/traps.c:261 do_error_trap+0x11f/0x390 arch/x86/kernel/traps.c:298 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905 RIP: 0010:ovl_rename+0xcc9/0x1020 fs/overlayfs/dir.c:1036 RSP: 0018:ffff88010ffa7a88 EFLAGS: 00010246 RAX: ffff8801198be670 RBX: ffff880119be2840 RCX: 1ffff10023654af7 RDX: dffffc0000000000 RSI: ffff88011b2a5760 RDI: ffff88011b2a57b8 RBP: ffff88010ffa7b90 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8801255481a0 R11: ffff88011b17d060 R12: ffff88011b17d000 R13: ffff880112ddb1e0 R14: 1ffff10021ff4f61 R15: 0000000000000000 vfs_rename+0xda2/0x19c0 fs/namei.c:4455 SYSC_renameat2 fs/namei.c:4603 [inline] SyS_renameat2 fs/namei.c:4492 [inline] SYSC_rename fs/namei.c:4643 [inline] SyS_rename+0x63c/0xc40 fs/namei.c:4641 entry_SYSCALL_64_fastpath+0x23/0xc2 RIP: 0033:0x458da9 RSP: 002b:00007f22a5ea4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 00000000200000c0 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f22a5ea56d4 R13: 00000000004c4e1c R14: 00000000004d8af8 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..