The payload got filtered, so here it is again (substitute the actual character for [at]):
$\{_[at]P};${_[at]P} On Sat, Jul 21, 2018, 1:47 PM Chris Schoenberg wrote: > This only works in 4.4; earlier versions throw a 'bad substitution' error. It > causes an infinite loop of calls between 'expand_prompt_string' and > 'decode_prompt_string', > where calls to 'xmalloc' exhaust the heap: > ... >