A fix is available
APAR status
Closed as program error.
Error description
When using the builtin cd in a ksh93 subshell and the cd change to a directory different from the current directory of the parent, a memory leak occurs. The problem is seen using the following example : #!/bin/ksh93 mkdir /home/test 2>/dev/null cd /home/test integer i=0 while [[ $i -lt 200 ]] ; do text=$(cd /tmp; exit -1) i=i+1 done 2>/dev/null ps avg|grep $$ i=0 while [[ $i -lt 200 ]] ; do text=$(cd /tmp; exit -1) i=i+1 done 2>/dev/null ps avg|grep $$ The two ps avg outputs will show memory growth of the ksh93 process.
Local fix
1/If the subshell return 0 the problem doesn't exhibit. 2/If we move the builtin cd outside of the subshell the problem doesn't exhibit either, but then the current working directory need to be restored after the subshell returns from the example replace : text=$(cd /tmp; exit -1) by : cd /tmp text=$(exit -1) cd - Note : the exit is used here for simplification it might be replaced by any command that does not return 0. 3/ If we replace the builtin "cd" in the subshell by the /usr/bin/cd command, the problem doesn't exhibit either. from the example replace : text=$(cd /tmp; exit -1) by : text=$(/usr/bin/cd /tmp; exit -1)
Problem summary
When using the builtin cd in a ksh93 subshell and the cd change to a directory different from the current directory of the parent, a memory leak occurs.
Problem conclusion
Code changes has been done to free the memory at relevant places.
Temporary fix
Comments
6100-07 - use AIX APAR IV40257 6100-08 - use AIX APAR IV57798 6100-09 - use AIX APAR IV54769 6100-09 - use AIX APAR IV54769 6100-09 - use AIX APAR IV54769 7100-01 - use AIX APAR IV57497 7100-02 - use AIX APAR IV56943 7100-03 - use AIX APAR IV54628 7100-04 - use AIX APAR IV54614
APAR Information
APAR number
IV54628
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-01-27
Closed date
2014-01-27
Last modified date
2016-05-10
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U859733
UP14/05/22 I 1000
PTF to Fileset Mapping
U859733 bos.rte.shell 7.1.3.15
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Document Information
Modified date:
10 May 2016