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Bug 1359031 - [Document] debug kernel dump explain
Summary: [Document] debug kernel dump explain
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kexec-tools
Version: 7.3
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Bhupesh Sharma
QA Contact: Emma Wu
Depends On:
TreeView+ depends on / blocked
Reported: 2016-07-22 06:55 UTC by Qiao Zhao
Modified: 2017-08-01 09:31 UTC (History)
3 users (show)

Fixed In Version: kexec-tools-2.0.14-5.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2017-08-01 09:31:21 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:2300 normal SHIPPED_LIVE kexec-tools bug fix and enhancement update 2017-08-01 12:40:58 UTC

Description Qiao Zhao 2016-07-22 06:55:08 UTC
Description of problem:
QE found some error/panic on 2nd kernel, like bug:

I have talked with Dave Young, he said, "crashkernel=auto does not
support debug kernel because a lot of debug options been enabled."
I think we should announce this in our kexec-kdump-howto.txt file,
if anyone want to use kdump on debug kernel.

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

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Comment 1 Qiao Zhao 2016-11-16 03:08:26 UTC
Now is 7.4, add 7.4.0 flag.

Comment 2 Bhupesh Sharma 2017-04-05 06:22:41 UTC
As discussed with Dave and Bao on IRC, the debug kernels cannot be reliably used as crash/kdump kernels when the crash kernel memory is setup using the 'crashkernel=auto' boot argument.

This is because the debug kernels might enable a number of features which might cause the memory used by the same to swell up, which cannot be reliably met by using 'crashkernel=auto' boot argument.

Will cook up a patch to mention this limitation in kexec-kdump-howto.txt file.

Comment 7 errata-xmlrpc 2017-08-01 09:31:21 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, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

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