Parallelism causes immediate failure

[sanmai-NL]

user@localhost~$ env RUST_BACKTRACE=1 target/debug/lzjd -p 2 -r -g /dev/null

thread 'thread '<unnamed><unnamed>' panicked at '' panicked at 'attempted to leave type `internal::Local` uninitialized, which is invalidattempted to leave type `internal::Local` uninitialized, which is invalid', ', /rustc/7bade6ef730cff83f3591479a98916920f66decd/library/core/src/mem/mod.rs/rustc/7bade6ef730cff83f3591479a98916920f66decd/library/core/src/mem/mod.rs::659659::99

This happens only without -p 1 (so even without specific value) and not just on /dev/null or with the debug binary.