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Bug 1890888 - Took long time to return when bash -c 'exit 2 & wait $!' run in the big size LimitNPROC values
Summary: Took long time to return when bash -c 'exit 2 & wait $!' run in the big size ...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: bash
Version: 8.1
Hardware: All
OS: Linux
urgent
medium
Target Milestone: rc
: 8.0
Assignee: Siteshwar Vashisht
QA Contact: Karel Volný
URL:
Whiteboard:
Depends On:
Blocks: 1894442 1894443 1894444
TreeView+ depends on / blocked
 
Reported: 2020-10-23 08:17 UTC by Kyung Huh
Modified: 2024-06-13 23:16 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1894442 1894443 1894444 (view as bug list)
Environment:
Last Closed: 2021-05-18 15:06:03 UTC
Type: Bug
Target Upstream Version:
Embargoed:
kdudka: needinfo-


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 5633101 0 None None None 2020-12-08 06:34:28 UTC

Description Kyung Huh 2020-10-23 08:17:21 UTC
Description of problem:
Took long time to return when bash -c 'exit 2 & wait $!' run in the large of size LimitNPROC values

Version-Release number of selected component (if applicable):
RHEL 8.1
bash-4.4.19-10
kernel-4.18.0-147.13.2.el8_1.x86_64

How reproducible:
Measure time when bash -c 'exit 2 & wait $!' run with various ulimit -u values

Steps to Reproduce:
1. ulimit -u 1342177280
2. time /usr/bin/bash -c 'exit 2 & wait $!'
3. ulimit -u 134217728
4. time /usr/bin/bash -c 'exit 2 & wait $!'
5. ulimit -u 13421772
6. time /usr/bin/bash -c 'exit 2 & wait $!'
7. Compare elapsed time for each command

Actual results:

~~~
# ulimit -u 1342177280
[root@ertdumps ~]# time /usr/bin/bash -c 'exit 2 & wait $!'
real    0m37.341s
user    0m37.275s
sys     0m0.001s
~~~

~~~
# ulimit -u 13421772
# time /usr/bin/bash -c 'exit 2 & wait $!'
real    0m0.089s
user    0m0.023s
sys     0m0.065s
~~~

~~~
# ulimit -u 134217728
# time /usr/bin/bash -c 'exit 2 & wait $!'
real    0m0.556s
user    0m0.128s
sys     0m0.426s
~~~

Expected results:
The bash command should return quickly even though LimitNPROC values is large.

Additional info:

Comment 27 errata-xmlrpc 2021-05-18 15:06:03 UTC
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 (Low: bash security and bug fix update), 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-2021:1679


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