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Description of problem:
The following scripts are making bash to leak memory (originally reproducers for ksh memleaks). Also, the scripts run significantly slower under bash than with ksh (may be caused by the leaks, though).
$ cat repr1.ksh
#!/usr/bin/ksh
function _hash {
typeset w=([abc]=1 [def]=31534 [xyz]=42)
print -u2 $w 2>&-
# accessing the var will leak
}
function _array {
typeset w=(1 31534 42)
print -u2 $w 2>&-
# unset w will prevent leak
}
pmap -x $$ |tail -1
for (( j=0; j<100; j++)); do
for (( i=0; i<10000; i++)); do
_hash
done
pmap -x $$ |tail -1
done
sleep 1
$ cat repr4.ksh
#!/usr/bin/ksh
function _hash {
typeset w=([abc]=1 [def]=31534 [xyz]=42)
print -u2 $w 2>&-
# accessing the var will leak
}
function _array {
typeset w=(1 31534 42)
print -u2 $w 2>&-
# unset w will prevent leak
}
pmap -x $$ |tail -1
for (( j=0; j<100; j++)); do
for (( i=0; i<10000; i++)); do
_array
done
pmap -x $$ |tail -1
done
sleep 1
Version-Release number of selected component (if applicable):
bash-4.2.46-19.el7
How reproducible:
Always
Steps to Reproduce:
1. run the scripts from description
2.
3.
Actual results:
Memory usage grows quickly:
$ bash repr1.ksh
total kB 115060 3152 252
total kB 117964 6096 3196
total kB 120868 8912 6012
total kB 123640 11724 8824
total kB 126412 14536 11636
^C
$ bash repr4.ksh
total kB 115060 3152 256
total kB 117964 6096 3200
total kB 120868 8912 6016
total kB 123640 11724 8828
total kB 126412 14536 11640
^C
$
Expected results:
Steady memory usage as is with ksh:
$ ksh repr1.ksh
total kB 116848 1728 292
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
total kB 116848 1860 312
^C
$ ksh repr4.ksh
total kB 116848 1720 288
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
total kB 116848 1852 308
^C
Additional info:
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2017:1931
Description of problem: The following scripts are making bash to leak memory (originally reproducers for ksh memleaks). Also, the scripts run significantly slower under bash than with ksh (may be caused by the leaks, though). $ cat repr1.ksh #!/usr/bin/ksh function _hash { typeset w=([abc]=1 [def]=31534 [xyz]=42) print -u2 $w 2>&- # accessing the var will leak } function _array { typeset w=(1 31534 42) print -u2 $w 2>&- # unset w will prevent leak } pmap -x $$ |tail -1 for (( j=0; j<100; j++)); do for (( i=0; i<10000; i++)); do _hash done pmap -x $$ |tail -1 done sleep 1 $ cat repr4.ksh #!/usr/bin/ksh function _hash { typeset w=([abc]=1 [def]=31534 [xyz]=42) print -u2 $w 2>&- # accessing the var will leak } function _array { typeset w=(1 31534 42) print -u2 $w 2>&- # unset w will prevent leak } pmap -x $$ |tail -1 for (( j=0; j<100; j++)); do for (( i=0; i<10000; i++)); do _array done pmap -x $$ |tail -1 done sleep 1 Version-Release number of selected component (if applicable): bash-4.2.46-19.el7 How reproducible: Always Steps to Reproduce: 1. run the scripts from description 2. 3. Actual results: Memory usage grows quickly: $ bash repr1.ksh total kB 115060 3152 252 total kB 117964 6096 3196 total kB 120868 8912 6012 total kB 123640 11724 8824 total kB 126412 14536 11636 ^C $ bash repr4.ksh total kB 115060 3152 256 total kB 117964 6096 3200 total kB 120868 8912 6016 total kB 123640 11724 8828 total kB 126412 14536 11640 ^C $ Expected results: Steady memory usage as is with ksh: $ ksh repr1.ksh total kB 116848 1728 292 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 total kB 116848 1860 312 ^C $ ksh repr4.ksh total kB 116848 1720 288 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 total kB 116848 1852 308 ^C Additional info: