Comment 0 for bug 1828187

== Comment: #0 - Hari Krishna Bathini <email address hidden> - 2019-05-07 13:37:51 ==
---Problem Description---
On 4.18.0-18-generic kernel, kexec load command throws below traces:

---

Regular kexec load:

root@ubuntu:~# kexec -l --append="`cat /proc/cmdline`" --initrd=/boot/initrd.img-`uname -r` /boot/vmlinux-`uname -r`
/proc/device-tree/ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory: No such file or directory
Modified cmdline:BOOT_IMAGE=/boot/vmlinux-4.18.0-18-generic root=UUID=1aa9458c-3974-4cb4-9ab3-9ee03c0f4e5e ro crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M@128M
root@ubuntu:~#
---

KDump kernel load:

root@ubuntu:~# kdump-config unload
 * unloaded kdump kernel
root@ubuntu:~# kdump-config load
 * Creating symlink /var/lib/kdump/vmlinuz
 * Creating symlink /var/lib/kdump/initrd.img
/proc/device-tree/ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory: No such file or directory
/proc/device-tree/ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory: No such file or directory
Modified cmdline:BOOT_IMAGE=/boot/vmlinux-4.18.0-18-generic root=UUID=1aa9458c-3974-4cb4-9ab3-9ee03c0f4e5e ro maxcpus=1 systemd.unit=kdump-tools-dump.service irqpoll noirqdistrib nousb elfcorehdr=158912K
 * loaded kdump kernel
root@ubuntu:~#
---

Contact Information = <email address hidden>

---uname output---
Linux ubuntu 4.18.0-18-generic #19~18.04.1-Ubuntu SMP Fri Apr 5 10:21:11 UTC 2019 ppc64le ppc64le ppc64le GNU/Linux

---Additional Hardware Info---
na

Machine Type = na

---Debugger---
A debugger is not configured

---Steps to Reproduce---
 Load panic kernel or regular kernel with kexec command:

kdump-config unload; kdump-config load

OR

kexec -l --append="`cat /proc/cmdline`" --initrd=/boot/initrd.img-`uname -r` /boot/vmlinux-`uname -r`

Actual Result:
DT files are not found while loading the kernel

Expected result:
kexec loads without any warning/error messages

Userspace tool common name: kexec-tools

The userspace tool has the following bit modes: 64-bit

Userspace rpm: kexec-tools

Userspace tool obtained from project website: na

*Additional Instructions for <email address hidden>:
-Attach ltrace and strace of userspace application.

== Comment: #1 - Hari Krishna Bathini <email address hidden> - 2019-05-07 13:44:25 ==

Since v4.16 kernel, ibm,dynamic-memory-v2 Device Tree Property is supported
in the kernel. This leaves kexec-tools on ppc64le broken without the below
fix patches:

https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/commit/?id=c740fdb2048265551f77d3f0fe53b2fddc0c8489
("kexec: add a helper function to add ranges")

https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/commit/?id=b10924a7da3ca48c04982cd23daf04882afb1a87
("kexec/ppc64: add support to parse ibm, dynamic-memory-v2 property")