As seen in bug 1446286, some kind of Rust signatures end up with a giant hex value at the end, which seems like it varies depending on the build. It would be good to remove these from the signature. That other bug has: [@ mozalloc_abort | abort | _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::h347d5eb6ff0d418b ] [@ mozalloc_abort | abort | _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::ha0cc3a41a8a3e3b9 ] [@ mozalloc_abort | abort | _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::hd6a552dc4219e630 ] [@ mozalloc_abort | abort | _$LT$rayon_core..job..HeapJob$LT$BODY$GT$$u20$as$u20$rayon_core..job..Job$GT$::execute::h358113e66001593d ] The root problem might be that the name demangling isn't working, or symbolication isn't quite right, but it would at least be nice to strip out the hex values.

Pretty sure this is the same issue as bug #1440233. If that's not the case, let me know.