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Message #127142
[Bug 1461078] Re: kdump service fails to start on Power8
Hello bugproxy, or anyone else affected,
Accepted kexec-tools into trusty-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/kexec-
tools/1:2.0.6-0ubuntu2.2 in a few hours, and then in the -proposed
repository.
Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Your feedback will aid us getting this update
out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed. In either case, details of your testing will help
us make a better decision.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!
** Changed in: kexec-tools (Ubuntu Trusty)
Status: In Progress => Fix Committed
** Tags added: verification-needed
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https://bugs.launchpad.net/bugs/1461078
Title:
kdump service fails to start on Power8
Status in kexec-tools package in Ubuntu:
Fix Released
Status in kexec-tools source package in Trusty:
Fix Committed
Bug description:
[SRU justification]
Needed to avoid load failure on Power8
[Impact]
Without this fix, kexec will not load on Power8
[Fix]
Apply upstream fix present in Dev release
[Test Case]
1) sudo apt-get install linux-crashdump
2) reboot server
3) kdump-config load
As outlined in the initial description, kdump will fail to load
without the fix.
[Regression]
None expected, fix is already present in the development version (Wily)
[Original description of the problem]
== Comment: #0 - SACHIN P. SANT <ssant@xxxxxxxxxx> - 2015-06-01 06:39:56 ==
---Problem Description---
kdump service fails to start
Contact Information = Sachin Sant / ssant@xxxxxxxxxx
---uname output---
3.19.0-18-generic
Machine Type = POWER8
---Debugger---
A debugger is not configured
---Steps to Reproduce---
1) Using latest daily ISO install 14.04.02 as a Power VM guest
2) Upgrade the kernel to 3.19 level (3.19.0-18-generic)
3) Configure kdump
kdump-config load command fails with following error:
root@alp9:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinux-3.19.0-18-generic root=UUID=3ea23bcf-7269-432f-bacc-f82c6cdd774e ro splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
root@alp9:~# kdump-config show
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr:
current state: Not ready to kdump
kexec command:
no kexec command recorded
root@alp9:~# kdump-config load
unrecoverable error: short read from"/proc/device-tree//ibm,drc-names"
* failed to load kdump kernel
root@alp9:~#
Userspace tool common name: kexec-tools
The userspace tool has the following bit modes: 64-bit
Userspace rpm: kdump-tools(1.5.5-2ubuntu1.2)
Userspace tool obtained from project website: na
*Additional Instructions for Sachin Sant / ssant@xxxxxxxxxx:
-Post a private note with access information to the machine that the bug is occuring on.
-Attach ltrace and strace of userspace application.
== Comment: #2 - MAMATHA INAMDAR <mainamdar@xxxxxxxxxx> - 2015-06-02 02:23:51 ==
root@alp9:~# /etc/init.d/kdump-tools start
Starting kdump-tools: unrecoverable error: short read from"/proc/device-tree//ibm,drc-names"
* failed to load kdump kernel
root@alp9:~# dpkg -l | grep kexec
ii kexec-tools 1:2.0.6-0ubuntu2.1 ppc64el tools to support fast kexec reboots
root@alp9:~# dpkg -l | grep kdump
ii kdump-tools 1.5.5-2ubuntu1.2 all scripts and tools for automating kdump (Linux crash dumps)
root@alp9:~# cat /sys/kernel/kexec_crash_loaded
0
root@alp9:~# kdump-config status
current state : Not ready to kdump
root@alp9:~# dmesg | grep -i crash
[ 0.000000] Reserving 2048MB of memory at 128MB for crashkernel (System RAM: 102400MB)
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinux-3.19.0-18-generic root=UUID=3ea23bcf-7269-432f-bacc-f82c6cdd774e ro splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
root@alp9:~#
== Comment: #3 - Hari Krishna Bathini <hbathini@xxxxxxxxxx> - 2015-06-02 07:29:23 ==
The following upstream commit fixes this issue:
---
commit d1932cd592e2a6aaf50ed22cfa2d7562b583854a
Author: Anton Blanchard <anton@xxxxxxxxx>
Date: Tue Dec 2 10:59:40 2014 +1100
kexec/fs2dt: Use slurp_file_len to avoid partial read of files
The OPAL firmware is going to embed its symbol map in the device tree.
The size is large enough to be more than a page, and it takes
multiple reads to get the whole file. This is because sysfs uses
the seq_file helpers which do a page at a time.
Unfortunately fs2dt has no handling for short reads and we die
with:
unrecoverable error: short read from"/proc/device-
tree//ibm,opal/firmware/symbol-map"
This patch uses the slurp_file_len helper which does the right thing.
It moves the explicit open of the file further down for
add_usable_mem_property and add_dyn_reconf_usable_mem_property.
We should convert both of these to use the buffer provided by
slurp_file_len at some stage.
Signed-off-by: Anton Blanchard <anton@xxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
This patch applies cleanly on the kexec-tools version
1:2.0.6-0ubuntu2.1 on Ubuntu 14.04.2.
Thanks
Hari
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