EXT4-fs error (device sda1): ext4_remount:5227: Abort forced by user overlayfs: failed to create directory ./file1/index (errno: 30); mounting read-only ===================================== WARNING: bad unlock balance detected! 4.14.179-syzkaller #0 Not tainted ------------------------------------- syz-executor.2/22270 is trying to release lock (sb_writers) at: [] ovl_workdir_create.cold+0xeb/0xf7 fs/overlayfs/super.c:546 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.2/22270: #0: (&type->s_umount_key#58/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#58/1){+.+.}, at: [] sget_userns+0x556/0xc30 fs/super.c:516 stack backtrace: CPU: 1 PID: 22270 Comm: syz-executor.2 Not tainted 4.14.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_unlock_imbalance_bug kernel/locking/lockdep.c:3552 [inline] print_unlock_imbalance_bug.cold+0x110/0x11f kernel/locking/lockdep.c:3529 __lock_release kernel/locking/lockdep.c:3769 [inline] lock_release+0x5e2/0x7f0 kernel/locking/lockdep.c:4017 ovl_workdir_create.cold+0xeb/0xf7 fs/overlayfs/super.c:546 ovl_fill_super+0x1d73/0x265d fs/overlayfs/super.c:1084 mount_nodev+0x4c/0xf0 fs/super.c:1180 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c829 RSP: 002b:00007f43f3d0cc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f62e0 RCX: 000000000045c829 RDX: 0000000020000100 RSI: 0000000020000000 RDI: 0000000000400000 RBP: 000000000078bf00 R08: 0000000020000400 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000075c R14: 00000000004ca197 R15: 00007f43f3d0d6d4 EXT4-fs error (device sda1): ext4_remount:5227: Abort forced by user netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs error (device sda1): ext4_remount:5227: Abort forced by user EXT4-fs error (device sda1): ext4_remount:5227: Abort forced by user netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. EXT4-fs error (device sda1): ext4_remount:5227: Abort forced by user overlayfs: try deleting index dir or mounting with '-o index=off' to disable inodes index. EXT4-fs error (device sda1): ext4_remount:5227: Abort forced by user ------------[ cut here ]------------ WARNING: CPU: 1 PID: 19251 at fs/namespace.c:1178 cleanup_mnt+0xfc/0x140 fs/namespace.c:1178