These bugs (also called Problem Reports) are great starting points for new contributors to GCC. If you have doubts or questions, don't be afraid to ask in the bugzilla page of each bug.

C-family (bug affects both C and C++)

A patch exists but needs to be tested

Analyzed what needs to be fixed, but no patch

C only

Analyzed what needs to be fixed, but no patch

C++ only

A patch exists but needs to be tested

A patch exists but needs to be updated

Analyzed what needs to be fixed, but no patch

Fortran

Analyzed what needs to be fixed, but no patch