Crash report: https://crash-stats.mozilla.org/report/index/aaabcad3-43b1-4c5c-b883-f70670230709

Reason: EXCEPTION_STACK_BUFFER_OVERRUN / FAST_FAIL_GUARD_ICALL_CHECK_FAILURE

Top 10 frames of crashing thread:

0  ntdll.dll  RtlFailFast2  
1  ntdll.dll  RtlpHandleInvalidUserCallTarget  
2  ntdll.dll  LdrpHandleInvalidUserCallTarget  
3  xul.dll  core::ops::function::impls::impl$3::call_mut  /rustc/84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc/library/core/src/ops/function.rs:298
3  xul.dll  once_cell::imp::initialize_or_wait  third_party/rust/once_cell/src/imp_std.rs:206
4  xul.dll  once_cell::imp::OnceCell<std::sync::mutex::Mutex<alloc::vec::Vec<glean_core::metrics::ping::PingType, alloc::alloc::Global> > >::initialize  third_party/rust/once_cell/src/imp_std.rs:78
4  xul.dll  once_cell::sync::OnceCell<std::sync::mutex::Mutex<alloc::vec::Vec<glean_core::metrics::ping::PingType, alloc::alloc::Global> > >::get_or_try_init  third_party/rust/once_cell/src/lib.rs:1129
4  xul.dll  once_cell::sync::OnceCell<std::sync::mutex::Mutex<alloc::vec::Vec<glean_core::metrics::ping::PingType, alloc::alloc::Global> > >::get_or_init  third_party/rust/once_cell/src/lib.rs:1088
4  xul.dll  glean_core::register_ping_type  third_party/rust/glean-core/src/lib.rs:777
5  xul.dll  glean_core::metrics::ping::PingType::new  third_party/rust/glean-core/src/metrics/ping.rs:71

Gonna spend a couple cycles looking at what's with this. Should be impossible in Rust (unless the rust impl is buggy).