kernel panic redox

KERNEL PANIC: panicked at 'Grant dropped while still mapped', src/context/memory.rs:630:9
TRACE: FFFFFE800028F9E0
  FFFFFE800028F9E0: FFFFFF00000BE487
    FFFFFF00000BE330+0157
    rust_begin_unwind
  FFFFFE800028FAE0: FFFFFF0000015C43
    FFFFFF0000015C10+0033
    core::panicking::panic_fmt
  FFFFFE800028FB20: FFFFFF0000015C97
    FFFFFF0000015C50+0047
    core::panicking::panic
  FFFFFE800028FB70: FFFFFF00000AB858
    FFFFFF00000AB6D0+0188
    <alloc::collections::btree::map::IntoIter<K,V> as core::ops::drop::Drop>::drop
  FFFFFE800028FBC0: FFFFFF00000C424F
    FFFFFF00000C4200+004F
    alloc::sync::Arc<T>::drop_slow
  FFFFFE800028FC30: FFFFFF00000C3C22
    FFFFFF00000C3830+03F2
    alloc::sync::Arc<T>::drop_slow
  FFFFFE800028FC80: FFFFFF000009EB0D
    FFFFFF000009E9C0+014D
    kernel::sync::wait_condition::WaitCondition::notify
  FFFFFE800028FCD0: FFFFFF00000BC1EF
    FFFFFF00000BC030+01BF
    kernel::scheme::user::UserInner::call
  FFFFFE800028FD60: FFFFFF00000BBA91
    FFFFFF00000BB9C0+00D1
    <kernel::scheme::user::UserScheme as syscall::scheme::scheme::Scheme>::open
  FFFFFE800028FDE0: FFFFFF00000C0D41
    FFFFFF00000C09D0+0371
    kernel::syscall::fs::open
  FFFFFE8000290F50: FFFFFF000005A95C
    FFFFFF00000599D0+0F8C
    kernel::syscall::syscall
  FFFFFE80002912E0: FFFFFF00000BE2D0
    FFFFFF00000BE260+0070
    __inner_syscall_instruction
  FFFFFE8000291350: FFFFFF00000BE213
    FFFFFF00000BE1D0+0043
    kernel::arch::x86_64::interrupt::syscall::syscall_instruction
  00000000000001B6: GUARD PAGE
CPU 2, PID ContextId(78)
NAME: file:/bin/config
SYSCALL: open(Ok("vec:/hi"), 0x10101B6)
HALT