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Memory continuesly increase

From: jake
Subject: Memory continuesly increase
Date: Tue, 18 Dec 2018 23:18:35 -0700 (MST)

Hi all,I did a test about run a bash scriplt never quit,but met a memory
usage issue that cause used memory continuous increase.This issue was
present in bash-3.2.x, bash-4.0.x, bash-4.1.x, bash-4.2.x, bash-4.3.x.
However, This issue was disappeared in bash-4.4.0, I can't trace which patch
fixed the issue or which new feature was introduced in bash-4.4.0.Here is
"Started testing"while(true);do  while (true); do    ls > /dev/null 
cat /proc/767/smaps |grep -A10 heap01ba5000-01be8000 rw-p 00000000 00:00 0      
[heap]Size:                268 kBRss:                 152 kBPss:                
152 kBShared_Clean:          0 kBShared_Dirty:          0 kBPrivate_Clean:      
0 kBPrivate_Dirty:       152 kBReferenced:          152 kBSwap:                 
0 kBKernelPageSize:        4
cat /proc/767/smaps |grep -A10 heap00d4c000-00e55000 rw-p 00000000 00:00 0      
[heap]Size:               1060 kBRss:                1048 kBPss:               
1048 kBShared_Clean:          0 kBShared_Dirty:          0 kBPrivate_Clean:     
0 kBPrivate_Dirty:      1048 kBReferenced:         1048 kBSwap:                 
0 kBKernelPageSize:        4
someone help to tell me which part of changes in bash-4.4.0, that would be
give me a direction backport code changes from bash-4.4 to bash-3.2.x and

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