<p>It could be due to latest ruby, as it is mentioned that previous version was ok.</p>
<p>Anyhow, the corefile from where you took the backtrace is written during the shutdown, this one can be a side effect of the one happening at runtime, overwriting it.</p>
<p>Enable core dump per pid and reproduce the issue again. You should get at least two core files if there is a runtime issue. Get the gdb backtraces from all the core files you get.</p>

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