overlayfs: failed to create directory ./file1/work (errno: 30); mounting read-only ===================================== hfsplus: unable to find HFS+ superblock WARNING: bad unlock balance detected! 4.14.267-syzkaller #0 Not tainted ------------------------------------- syz-executor.3/9970 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.3/9970: #0: (&type->s_umount_key#50/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#50/1){+.+.}, at: [] sget_userns+0x556/0xc10 fs/super.c:516 stack backtrace: CPU: 1 PID: 9970 Comm: syz-executor.3 Not tainted 4.14.267-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+0x1b2/0x281 lib/dump_stack.c:58 print_unlock_imbalance_bug include/trace/events/lock.h:58 [inline] __lock_release kernel/locking/lockdep.c:3769 [inline] lock_release.cold+0x70/0xbf kernel/locking/lockdep.c:4017 ovl_workdir_create.cold+0xeb/0xf7 fs/overlayfs/super.c:546 ovl_fill_super+0xfe9/0x2610 fs/overlayfs/super.c:988 mount_nodev+0x4c/0xf0 fs/super.c:1180 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2572 [inline] do_mount+0xe65/0x2a10 fs/namespace.c:2902 SYSC_mount fs/namespace.c:3118 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3095 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fbe23744059 RSP: 002b:00007fbe220b9168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbe23856f60 RCX: 00007fbe23744059 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007fbe2379e08d R08: 0000000020000340 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcf26438af R14: 00007fbe220b9300 R15: 0000000000022000 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7979 at fs/namespace.c:1178 cleanup_mnt+0x222/0x2c0 fs/namespace.c:1178