Bug 1465735
Summary: | non root user run kdumpctl cause dead loop | |||
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Product: | [Fedora] Fedora | Reporter: | Dave Young <ruyang> | |
Component: | kexec-tools | Assignee: | Ziyue Yang <ziyang> | |
Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | |
Severity: | unspecified | Docs Contact: | ||
Priority: | unspecified | |||
Version: | rawhide | CC: | bhe, kdump-team-bugs, ruyang, xlpang | |
Target Milestone: | --- | |||
Target Release: | --- | |||
Hardware: | Unspecified | |||
OS: | Unspecified | |||
Whiteboard: | ||||
Fixed In Version: | Doc Type: | If docs needed, set a value | ||
Doc Text: | Story Points: | --- | ||
Clone Of: | ||||
: | 1474174 (view as bug list) | Environment: | ||
Last Closed: | 2017-07-14 08:11:15 UTC | Type: | Bug | |
Regression: | --- | Mount Type: | --- | |
Documentation: | --- | CRM: | ||
Verified Versions: | Category: | --- | ||
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
Cloudforms Team: | --- | Target Upstream Version: | ||
Embargoed: |
Description
Dave Young
2017-06-28 04:57:19 UTC
This bug is caused by behavior difference between bash and sh(bash in posix). In the function single_instance_lock in kdumpctl script, there is exec 9>/var/lock/kdump which will fail in user mode. However, this fail will cause script exit under bash and non-exit under sh, causing infinite loop because the flock will always fail. According to the 15th item in ftp://ftp.gnu.org/old-gnu/Manuals/bash-2.02/html_node/bashref_66.html If a POSIX.2 special builtin returns an error status, a non-interactive shell exits. And according to https://www.gnu.org/software/bash/manual/html_node/Special-Builtins.html These are the POSIX special builtins: break : . continue eval exec exit export readonly return set shift trap unset I suggest fixing the bug by checking exec return value. Sorry it should be the 16th item. |