Single crash seen:

C  [libc.so.6+0x15cae0]  __strlen_avx2+0xc0
V  [libjvm.so+0xacd22b]  CodeCache::aggregate(outputStream*, unsigned long)+0x5b  (codeCache.cpp:1878)
V  [libjvm.so+0xb29a8a]  CompileBroker::print_heapinfo(outputStream*, char const*, unsigned long)+0x8ea  (compileBroker.cpp:2867)

The only use of strlen in this path is this JVMCI specific code https://github.com/openjdk/jdk/blob/master/src/hotspot/share/code/codeHeapState.cpp#L740

A bunch of nmethods are being flushed according to the log, which calls CodeBlob::purge which does this:

  if (_mutable_data != blob_end()) {
    os::free(_mutable_data);
    _mutable_data = blob_end(); // Valid not null address
  }

Since the JVMCI name is in the mutable section this breaks jvmci_name(), resulting in a crash.  I'm not sure whether this is a problem with flushing itself or the safety of CodeHeapState::get_cbType not handling methods which are being flushed.