Extremely slow demangling of malformed symbol using excessive memory #477
Description
Test case:
fn main() {
symbolic::demangle::demangle("_ZUlzjjlZZL1zStUlSt7j_Z3kjIIjIjL1vfIIEEEjzjjfjzSt7j_Z3kjIIjfjzL4t3kjIIjfjtUlSt7j_Z3kjIIjIjL1vfIIEEEjzjjfjzSt7j_Z3kjIIjfjzL4t3kjIIjfjzL4t7IjIjjzjjzSt7j_Z3kjIIjfjzStfjzSt7j_ZA3kjIIjIjL1vfIIEEEjzjjfjzSt7j_Z3kjIIjIjL1vfIIEEEjzjjfjzSt7j_Z3kjIIjfjzL4t3kjIIjzL4t7IjIjjzjjzSt7j_Z3kjIIjfjzStfjzSt7j_ZA3kjIIjIjL1vfIIEEEjzjjfjzSt7j_Z3kjIIjIjL1vfIIEEEjzjjfjzSt7j_Z3kjIIjfjzL4t3kjIIjfjzL4t7IjIjL1vfIIEEEjzjjSI");
}This is probably a cpp_demangle issue, but I can't reproduce this there. At least, that's where the stack trace led.
When fuzzing, this hits a memory limit and then stops. When running normally, it does complete successfully, but uses a few gigabytes of RAM on the way, and I assume it can be easily crafted to OOM any normal system, though I haven't tried it.
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