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memory leak in bash only during boot up in Bash-3.2.48


From: abhishpaliwal
Subject: memory leak in bash only during boot up in Bash-3.2.48
Date: Tue, 18 Dec 2018 22:54:14 -0700 (MST)

create a shell script from below given code. name it testing.sh. 

#!/bin/bash 
 logger "Started testing" 
 while(true); do 
while (true); do ls > /dev/null ; done 
 done 

Steps. 
# chmod 755 /root/testing.sh 
modify any /etc/init.d/"service" file add "/root/testing.sh" inside the
start case. 
"service" is any service file starting during start up. 
Make sure above service is started during the startup. 

Example : 
Add testing to audit init script 
start(){ 
        echo -n "Starting testing.sh" 
        /root/testing.sh & 

After boot up 

address@hidden:/root> ps fax | grep testing 
751 ? S 0:11 /bin/bash /root/testing.sh 
9684 ttyS0 S+ 0:00 \_ grep testing 

address@hidden:/root> cat /proc/751/smaps | grep -A10 heap 
01419000-016ad000 rw-p 00000000 00:00 0 [heap] 
Size: 2640 kB 
Rss: 2536 kB 
Pss: 2536 kB 
Shared_Clean: 0 kB 
Shared_Dirty: 0 kB 
Private_Clean: 0 kB 
Private_Dirty: 2536 kB 
Referenced: 2536 kB 
Swap: 0 kB 
KernelPageSize: 4 kB 

address@hidden:/root> cat /proc/751/smaps | grep -A10 heap 
01419000-016ce000 rw-p 00000000 00:00 0 [heap] 
Size: 2772 kB 
Rss: 2740 kB 
Pss: 2734 kB 
Shared_Clean: 0 kB 
Shared_Dirty: 12 kB 
Private_Clean: 0 kB 
Private_Dirty: 2728 kB 
Referenced: 2740 kB 
Swap: 0 kB 
KernelPageSize: 4 kB

But when we are testing the same on Bash-4.4.0, its not consuming the memory
and steady as well, below are the logs 

address@hidden:/root> ps fax | grep testing
  964 ?        S      0:02 /bin/bash /root/testing.sh
11484 pts/0    S+     0:00          \_ grep testing
address@hidden:/root> cat /proc/964/smaps | grep -A10 heap
00b1b000-00b32000 rw-p 00000000 00:00 0                                 
[heap]
Size:                 92 kB
Rss:                  88 kB
Pss:                  88 kB
Shared_Clean:          0 kB
Shared_Dirty:          0 kB
Private_Clean:         0 kB
Private_Dirty:        88 kB
Referenced:           88 kB
Swap:                  0 kB
KernelPageSize:        4 kB
address@hidden:/root> cat /proc/964/smaps | grep -A10 heap
00b1b000-00b32000 rw-p 00000000 00:00 0                                 
[heap]
Size:                 92 kB
Rss:                  88 kB
Pss:                  60 kB
Shared_Clean:          0 kB
Shared_Dirty:         56 kB
Private_Clean:         0 kB
Private_Dirty:        32 kB
Referenced:           88 kB
Swap:                  0 kB



--
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