error[E0080]: Miri evaluation error: type validation failed: encountered uninitialized bytes at .collector, but expected something greater or equal to 1
  |
  = note: inside call to `<crossbeam_epoch::internal::Local as crossbeam_epoch::sync::list::IsElement<crossbeam_epoch::internal::Local>>::entry_of` at /home/t/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/sync/list.rs:176:29
  = note: inside call to `crossbeam_epoch::sync::list::List::<crossbeam_epoch::internal::Local>::insert` at /home/t/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/internal.rs:291:13
  = note: inside call to `crossbeam_epoch::internal::Local::register` at /home/t/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/collector.rs:39:9
  = note: inside call to `crossbeam_epoch::collector::Collector::register` at /home/t/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/default.rs:17:34
  = note: inside call to `crossbeam_epoch::default::HANDLE::__init` at /home/t/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:231:5
  = note: inside call to `<fn() -> crossbeam_epoch::collector::LocalHandle {crossbeam_epoch::default::HANDLE::__init} as std::ops::FnOnce<()>>::call_once - shim(fn() -> crossbeam_epoch::collector::LocalHandle {crossbeam_epoch::default::HANDLE::__init})` at /home/t/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:285:25
  = note: inside call to `std::thread::local::lazy::LazyKeyInner::<crossbeam_epoch::collector::LocalHandle>::initialize::<fn() -> crossbeam_epoch::collector::LocalHandle {crossbeam_epoch::default::HANDLE::__init}>` at /home/t/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:426:22
  = note: inside call to `std::thread::__FastLocalKeyInner::<crossbeam_epoch::collector::LocalHandle>::try_initialize::<fn() -> crossbeam_epoch::collector::LocalHandle {crossbeam_epoch::default::HANDLE::__init}>` at /home/t/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:411:25
  = note: inside call to `std::thread::__FastLocalKeyInner::<crossbeam_epoch::collector::LocalHandle>::get::<fn() -> crossbeam_epoch::collector::LocalHandle {crossbeam_epoch::default::HANDLE::__init}>` at <::std::thread::local::__thread_local_inner macros>:22:43
  = note: inside call to `crossbeam_epoch::default::HANDLE::__getit` at /home/t/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:254:32
  = note: inside call to `std::thread::LocalKey::<crossbeam_epoch::collector::LocalHandle>::try_with::<[closure@DefId(24:620 ~ crossbeam_epoch[eba2]::default[0]::with_handle[0]::{{closure}}[0]) 0:&mut [closure@DefId(24:613 ~ crossbeam_epoch[eba2]::default[0]::pin[0]::{{closure}}[0])]], crossbeam_epoch::guard::Guard>` at /home/t/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/default.rs:42:5
  = note: inside call to `crossbeam_epoch::default::with_handle::<[closure@DefId(24:613 ~ crossbeam_epoch[eba2]::default[0]::pin[0]::{{closure}}[0])], crossbeam_epoch::guard::Guard>` at /home/t/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-epoch-0.7.1/src/default.rs:23:5
note: inside call to `crossbeam_epoch::default::pin` at crates/pagecache/src/ds/pagetable.rs:274:21
 --> crates/pagecache/src/ds/pagetable.rs:274:21
  |
27|         let guard = pin();