Thanks for reporting. Coredump is useless without a binary used.  Even with that binary it would be of no use if the binary was built without debugging information.  So that, unfortunately, this gives no information on where the bug might be or how to trigger it.

I hope this is the right place. I encountered the bug when using `nix build` to build a layered Docker image. I asked in the NixOS official Matrix room and they pointed me here to open a bug and include the coredump. The log message Nix gives me is:

* buffer overflow detected *: terminated
bash: line 9:   162 Aborted                 (core dumped) tar --sort name --numeric-owner --mtime "@$SOURCE_DATE_EPOCH" --hard-dereference -cf $out/layer.tar .

The coredump is attached.

best,
Steve