hi I accidentally copied a section of JSON text to the terminal and executed it, which resulted in a system crash.Bash version is 5.1.8. Later, I reproduced it and found that when I executed the following command, the memory usage of bash became very large. $ [{"key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1"},{"key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1"},{"key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1"},{"key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1","key":"1"}] Through tracking the code, it was found that in the brace_expand_word_list function, there is a continuous recursive execution of the brace_expand function, which causes the len2 variable of function array_concat to become abnormally large, and then a large amount of memory will be malloced based on the value of len2 This may be a normal manifestation of bash rather than a problem. But in the case of user misoperation, it can cause system crashes, so I still hope that this situation can be improved