Looks like gibberish

You forgot take LE byte order into account. It's actually "nstance␊" (the final letters of "instance" or "Instance" followed by a LF). 

$ perl -e'
   use DDP print_escapes => 1;
   p ${\ pack "J", 0xa65636e6174736e };
'
"nstance\n"

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In reply to Re^2: XS Error: Segfault with B::HooksAtRuntime by ikegami
in thread XS Error: Segfault with B::HooksAtRuntime by Ovid

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