hashbrown: panic assertion failed intermitent crash compiled to WASM and running with libwebkit2gtk on Linux

Compiled using wasm-bindgen, via wasm-pack using the web target, and the --dev profile. This code is running in the webkit2gtk 2.28.4-1 browser on Archlinux.

Stack trace:

panicked at 'assertion failed: `(left != right)`
  left: `0`,
 right: `0`', ~/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/macros/mod.rs:16:9

<?>.wasm-function[console_error_panic_hook::Error::new::h11710926359e6a99]@[wasm code]
<?>.wasm-function[console_error_panic_hook::hook_impl::h43ac723b12164d7a]@[wasm code]
<?>.wasm-function[console_error_panic_hook::hook::h1509fc86d60f8ecc]@[wasm code]
<?>.wasm-function[core::ops::function::Fn::call::h63e0941c1aa82381]@[wasm code]
<?>.wasm-function[std::panicking::rust_panic_with_hook::h3e6619a8809a443a]@[wasm code]
<?>.wasm-function[rust_begin_unwind]@[wasm code]
<?>.wasm-function[core::panicking::panic_fmt::ha8209066b105fcdd]@[wasm code]
<?>.wasm-function[hashbrown::raw::inner::RawTable<T>::bucket::hfcb3cc32fba2684b]@[wasm code]
<?>.wasm-function[hashbrown::raw::inner::RawTable<T>::insert::h71a2e674faab18bc]@[wasm code]
<?>.wasm-function[indexmap::map::core::IndexMapCore<K,V>::push::h4f42c6dc20fce8fb]@[wasm code]
<?>.wasm-function[indexmap::map::core::IndexMapCore<K,V>::insert_full::h6cc9bd7b0982815d]@[wasm code]
<?>.wasm-function[indexmap::map::IndexMap<K,V,S>::insert_full::he19372e70f82483d]@[wasm code]
<?>.wasm-function[indexmap::map::IndexMap<K,V,S>::insert::h007a7c31241165e3]@[wasm code]
<?>.wasm-function[<indexmap::map::IndexMap<K,V,S> as core::iter::traits::collect::Extend<(K,V)>>::extend::{{closure}}::h396d242148f62446]@[wasm code]
<?>.wasm-function[core::iter::traits::iterator::Iterator::for_each::call::{{closure}}::hbb035c70f8777522]@[wasm code]
<?>.wasm-function[core::iter::adapters::map_fold::{{closure}}::h62be75b9f0a27adf]@[wasm code]
<?>.wasm-function[core::iter::adapters::filter_fold::{{closure}}::h268ff1624341ca8a]@[wasm code]
<?>.wasm-function[core::iter::adapters::map_fold::{{closure}}::hcf5aea4a2ef5e328]@[wasm code]
<?>.wasm-function[core::iter::traits::iterator::Iterator::fold::h853140cd02b11d69]@[wasm code]
<?>.wasm-function[<core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold::hf5d0ea58d414ae46]@[wasm code]
<?>.wasm-function[<core::iter::adapters::Filter<I,P> as core::iter::traits::iterator::Iterator>::fold::hfe2842f31b010ace]@[wasm code]
<?>.wasm-function[<core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold::h64e7ef0a45baccd6]@[wasm code]
<?>.wasm-function[core::iter::traits::iterator::Iterator::for_each::h5ba4ea97dae030ca]@[wasm code]
<?>.wasm-function[<indexmap::map::IndexMap<K,V,S> as core::iter::traits::collect::Extend<(K,V)>>::extend::h413750f7b641b695]@[wasm code]
<?>.wasm-function[<indexmap::map::IndexMap<K,V,S> as core::iter::traits::collect::FromIterator<(K,V)>>::from_iter::h49e190a53d106e85]@[wasm code]
<?>.wasm-function[<indexmap::set::IndexSet<T,S> as core::iter::traits::collect::FromIterator<T>>::from_iter::hc8ac9b46dc06688c]@[wasm code]
<?>.wasm-function[core::iter::traits::iterator::Iterator::collect::h6577e1d6120a2276]@[wasm code]
<?>.wasm-function[<yew::virtual_dom::Classes as core::convert::From<&str>>::from::hdb0a0b180f292b8c]@[wasm code]
<?>.wasm-function[<T as core::convert::Into<U>>::into::h22798bc94b25b76c]@[wasm code]

It’s possible this may be related to https://github.com/rust-random/rand/issues/1016 Perhaps it’s a stability issue in libwebkit2gtk.