[Crash-utility] Crash-utility issue with MIPS

[Ilan Schwarts]

Hi.
Please uname -a. What is the kernel version. Also type in crash the command
with -d to print debug. That would be helpful for further investigation


On Jul 5, 2018 17:51, "Mozes, Rachel" <rachel.mozes at intel.com> wrote:

Hi all,
I'm an Intel employee, having a MIPS Platform running Linux OS.
I enabled the kexec\kdump flow in Linux version we use and now I have
vmcore memory dump, and now I'm getting into troubles....
I'm running the crash utility compiled with "target=MIPS" and getting the
output:

crash: read error: kernel virtual address: xxxx30fc type: "possible"
WARNING: cannot read cpu_possible_map
crash: read error: kernel virtual address: xxxx30f4 type: "present"
WARNING: cannot read cpu_present_map
crash: read error: kernel virtual address: xxxx30f8 type: "online"
WARNING: cannot read cpu_online_map
crash: read error: kernel virtual address: xxxx30f0 type: "active"
WARNING: cannot read cpu_active_map
crash: read error: kernel virtual address:xxxx0a48 type: "shadow_timekeeper
xtime_sec"
crash: read error: kernel virtual address: xxxxa444 type: "init_uts_ns"
*crash: linux/vmlinux and vmcore do not match!*

As you see the tool claims that the vmlinux doesn't match to the vmcore
although the vmcore captured from the given vmlinux.
When I open the vmcore with gdb from our toolchain provided by MIPS, it's
successfully opened and I see that the init_uts_ns is in offset xxxxa440
instead of xxxxa444 it looks for in the crash utility.

I thought that maybe the issue is we use a propriety toolchain provided by
Codescape (the next link) and tried to replace the gdb packet in the
Makefile - but then the tool wasn't compile, it fails in the gdb_merge step:
http://codescape-mips-sdk.imgtec.com/components/toolchain/2017.10-05/
downloads.html

Can you help us to understand how to overcome this issue? is there any way
to replace the gdb binary that the tool uses?

We'll very appreciate your help.



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