WARNING: CPU: 1 PID: 9102 at fs/overlayfs/dir.c:263 ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 9102 Comm: syz-executor0 Not tainted 4.20.0-rc3+ #127 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+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 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:969 RIP: 0010:ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263 Code: c3 89 c6 e8 29 ee ef fe 85 db 0f 85 9e 00 00 00 e8 0c ed ef fe 4c 89 e7 45 31 f6 e8 21 5e 46 ff e9 ec fe ff ff e8 f7 ec ef fe <0f> 0b e9 e0 fe ff ff e8 eb ec ef fe 0f 0b e9 63 ff ff ff e8 ff 3b RSP: 0018:ffff8881928279a0 EFLAGS: 00010212 RAX: 0000000000040000 RBX: ffff888192827a38 RCX: ffffc90005fdf000 RDX: 0000000000008e2d RSI: ffffffff828f9df9 RDI: 0000000000000007 UBIFS error (pid: 9108): cannot open "ubev/nbd", error -22 RBP: ffff888192827a60 R08: ffff88819322c700 R09: ffffed1032504ee7 R10: ffffed1032504ee7 R11: 0000000000000003 R12: ffff8881b611cca0 R13: ffff8881928279d8 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 kobject: 'loop5' (0000000015e1e2ec): kobject_uevent_env kobject: 'loop5' (0000000015e1e2ec): fill_kobj_path: path = '/devices/virtual/block/loop5' ovl_create_object+0x2e9/0x3a0 fs/overlayfs/dir.c:616 UBIFS error (pid: 9113): cannot open "ubev/nbd", error -22 ovl_mkdir+0x2b/0x30 fs/overlayfs/dir.c:635 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3817 do_mkdirat+0x27a/0x310 fs/namei.c:3840 __do_sys_mkdir fs/namei.c:3856 [inline] __se_sys_mkdir fs/namei.c:3854 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3854 kobject: 'loop1' (00000000a4c641bb): kobject_uevent_env do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 kobject: 'loop1' (00000000a4c641bb): fill_kobj_path: path = '/devices/virtual/block/loop1' entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb56e00ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 kobject: 'loop5' (0000000015e1e2ec): kobject_uevent_env R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb56e00b6d4 R13: 00000000004bcf1f R14: 00000000004d4738 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..