Bug 1377567

Summary: Kdump captures a extremely large vmcore
Product: [Fedora] Fedora Reporter: Tong Li <tonli>
Component: kexec-toolsAssignee: Pratyush Anand <panand>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 25CC: bhe, kdump-team-bugs, ruyang, tonli
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: kexec-tools-2.0.13-7.fc25 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-10-31 07:36:59 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On:    
Bug Blocks: 1379192    
Attachments:
Description Flags
kdump's configuration none

Description Tong Li 2016-09-20 06:29:10 UTC
Created attachment 1202714 [details]
kdump's configuration

Description of problem:

Kdump captures a extremely large vmcore after a crash, which is several GBs.

Version-Release number of selected component (if applicable):

kexec-tools-2.0.13-5.fc26.x86_64
kernel-4.8.0-0.rc6.git4.1.fc26.x86_64

How reproducible:


Steps to Reproduce:
1.echo c > /proc/sysrq-trigger
2.
3.

Actual results:

A vmcore file of several GBs

Expected results:

A vmcore file whose size is under 100M

Additional info:

Comment 1 Dave Young 2016-10-26 02:48:50 UTC
Fedora 25 kernel enabled kaslr by default so kdump default config does not work, Pratyush has patches to fix it, it will be likely accepted by upstream soon.

So we should fix it in F25 compose.

Comment 3 Fedora Update System 2016-10-28 14:55:08 UTC
kexec-tools-2.0.13-7.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-7a0e28b12e

Comment 4 Fedora Update System 2016-10-31 07:36:59 UTC
kexec-tools-2.0.13-7.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.