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Bug 1603017 - [Hyper-V][RHEL7.6]Hyper-V console goes into blank/hang state after server crash until reboot due to no hyperv_fb in kdump initramfs
Summary: [Hyper-V][RHEL7.6]Hyper-V console goes into blank/hang state after server cra...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kexec-tools
Version: 7.6
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Kairui Song
QA Contact: HuijingHei
URL:
Whiteboard:
Depends On:
Blocks: 1637753
TreeView+ depends on / blocked
 
Reported: 2018-07-19 02:15 UTC by HuijingHei
Modified: 2019-07-04 07:00 UTC (History)
12 users (show)

Fixed In Version: kexec-tools-2.0.15-20
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1637753 (view as bug list)
Environment:
Last Closed: 2018-10-30 11:29:39 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:3240 0 None None None 2018-10-30 11:30:22 UTC

Description HuijingHei 2018-07-19 02:15:04 UTC 
Description of problem:
Due to non-availability of Hyper-V video driver hyperv_fb in kdump
initramfs, the console seems to be in hang state with no text over it.

Version-Release number of selected component (if applicable):
kexec-tools-2.0.15-16.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Start os
2. Add "crashkernel=auto" to kernel parameter and reboot
3. Start kdump service and check kdump is running
# kdumpctl status
Kdump is operational
4. Check the kdump initramfs does not include hyperv_fb
# lsinitrd /boot/initramfs-3.10.0-915.el7.x86_64kdump.img | grep hyperv_fb
5. Trigger the crash and check the console
# echo c > /proc/sysrq-trigger

Actual results:
After kernel crash, the console seems to be in hang state with no text
over it until reboot

Expected results:
The logs will be visible over console after crash

Additional info:
If add hyperv_fb in kdump initramfs, the logs will be visible over console
1) Ensure /etc/kdump.conf contains the following line :
extra_modules hyperv_fb
2) Restart kdump service and check the kdump initramfs including the
hyperv_fb module
# lsinitrd /boot/initramfs-3.10.0-915.el7.x86_64kdump.img | grep hyperv_fb
Arguments: --hostonly --hostonly-cmdline --hostonly-i18n -o 'plymouth
dash resume ifcfg' --mount '/dev/mapper/rhel_bootp--73--131--181-root
/sysroot xfs defaults' --add-drivers ' hyperv_fb'
--no-hostonly-default-device -f
-rw-r--r--   1 root     root         6636 Jun 22 20:09
usr/lib/modules/3.10.0-915.el7.x86_64/kernel/drivers/video/hyperv_fb.ko.xz
3) Trigger the crash and check the console, check logs will be visible
over console
# echo c > /proc/sysrq-trigger

Refer to https://access.redhat.com/solutions/3500231 and
https://bugzilla.redhat.com/show_bug.cgi?id=1228774
Comment 5 HuijingHei 2018-09-12 06:36:05 UTC 
Verify passed with kexec-tools-2.0.15-21.el7.x86_64.

@Emma, thanks for your reminder.
Comment 8 errata-xmlrpc 2018-10-30 11:29:39 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.

https://access.redhat.com/errata/RHBA-2018:3240
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