Bug 473528
| Summary: | command hang in ksh and cpu workload is high | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 4 | Reporter: | Freax <holmes86> | ||||
| Component: | pdksh | Assignee: | Michal Hlavinka <mhlavink> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | BaseOS QE <qe-baseos-auto> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 4.9 | ||||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2010-03-05 13:50:35 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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Created attachment 325531 [details]
backported from mksh
patch backported from mksh, thanks to Thorsten Glaser
I'm sorry for not addressing the issue in RHEL-4. As pdksh is not scheduled for update in RHEL-4.9, I'm closing that bugzilla WONTFIX. If you are still experiencing the issue with RHEL-5, feel free to reopen it against RHEL-5. |
Description of problem: command hang in ksh and cpu workload is high Version-Release number of selected component (if applicable): pdksh-5.2.14-30.2 How reproducible: Steps to Reproduce: 1. create a script like belowing: # cat hang.sh #!/bin/ksh alias ls="ls" i=`ls` echo $i 2. issuce the script # ./hang.sh Actual Results: script hangs while executing i=`ls`, and the cpu workload is nearly 100% Expected Results: The script runs smoothly. Additional Information: # ps -e | grep hang 21776 pts/3 00:00:27 hang.sh # strace -p 21776 brk(0xa057000) = 0xa057000 brk(0xa078000) = 0xa078000 brk(0xa099000) = 0xa099000 brk(0xa0ba000) = 0xa0ba000 brk(0xa0db000) = 0xa0db000 brk(0xa0fc000) = 0xa0fc000 brk(0xa11d000) = 0xa11d000 ... # ltrace -p 21776 __rawmemchr(0x9480688, 0, 0xbff7e808, 0x8049a6a, 0x9fb71a8) = 0x948068a memset(0x80758a2, '\000', 63) = 0x80758a2 strcmp("ls", "ls") = 0 __ctype_b_loc() = 0xb7fdda84 __rawmemchr(0x9480688, 0, 0xbff7e808, 0x8049a6a, 0x9fb7210) = 0x948068a memset(0x80758a2, '\000', 63) = 0x80758a2 strcmp("ls", "ls") = 0 __ctype_b_loc() = 0xb7fdda84 __rawmemchr(0x9480688, 0, 0xbff7e808, 0x8049a6a, 0x9fb7278) = 0x948068a memset(0x80758a2, '\000', 63) = 0x80758a2 strcmp("ls", "ls") = 0 __ctype_b_loc() = 0xb7fdda84 __rawmemchr(0x9480688, 0, 0xbff7e808, 0x8049a6a, 0x9fb72e0) = 0x948068a memset(0x80758a2, '\000