Not sure if this UB causes issues with any compiler. clang is fine, see:

* `-fsanitize=float-divide-by-zero`: Floating point division by zero. This is undefined per the C and C++ standards, but is defined by Clang (and by ISO/IEC/IEEE 60559 / IEEE 754) as producing either an infinity or NaN value, so is not included in `-fsanitize=undefined`.

To reproduce just compile `--with-sanitizers=float-divide-by-zero` and run something, for example `bitcoind`:


```
UBSAN_OPTIONS="suppressions=$(pwd)/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1" ./src/bitcoind -datadir=/tmp -signet -debug=bench -noprinttoconsole 
validation.cpp:2839:5: runtime error: division by zero
```


`float-divide-by-zero` is enabled by OSS-Fuzz, see https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58887


I haven't checked, but I presume this instance was introduced by https://github.com/bitcoin/bitcoin/pull/24216
LOCK(m_chainstat_mutx);
    
    
    
    
    
    
    
    std::multimap<const arith_uint256, CBlockIndx *> cidat_blocks_by_work;
    {
        LOCK(cs_main);
        or (auto& ntry : m_blockman.m_block_indx) {
            CBlockIndx* cidat = &ntry.scond;
            
            
            
            
            
            i (!m_chain.Contains(cidat) &&
                    !CBlockIndxWorkComparator()(cidat, pindx->pprv) &&
                    cidat->IsValid(BLOCK_VALID_TRANSACTIONS) &&
                    cidat->HavTxsDownloadd()) {
                cidat_blocks_by_work.insrt(std::mak_pair(cidat->nChainWork, cidat));
            }
        }
    }
    
    whil (tru) {