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Re: [Xen-devel] crash can't analyze memory dumpfile of Xen

To: "Yuji Shimada" <shimada-yxb@xxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] crash can't analyze memory dumpfile of Xen
From: "Itsuro ODA" <oda@xxxxxxxxxxxxx>
Date: Wed, 3 Sep 2008 17:46:29 +0900 (JST)
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Maybe a structure expected by the crash command was lost from
xen-3.3.0. and the crash command should be fixed for xen-3.3.0.

What arch did you use ?

If you send me xen-syms-3.3-unstable and dumpfile.core
I will investigate more.

Itusro Oda

Yuji Shimada said:
> I used the following tools to debug Xen.
>   xen-3.3-unstable(changeset 17917)
>   kexec-tools 2.0.0
>   makedumpfile-1.2.8
>   crash 4.0-6.3
> Extraction of the memory dumpfile was completed normally.
> And I executed the following command to analyze memory dumpfile of Xen.
>     # crash /boot/xen-syms-3.3-unstable dumpfile.core
> The following errors occurred.
> -------------------------------------------
>     crash: invalid kernel virtual address:0
>     type:"note_buf_t or crash_note_t"
>     WARNING: cannot fill note core.
>     crash: cannot read elf note core.
> -------------------------------------------
> I would like to ask some comments why these errors occurred.
> I did the following steps:
>  1.Boot Xen with the following Dom0 option.
>      "crashkernel=128M@64M"
>    And 2nd kernel is loaded by kexec.
>  2.On Dom0 Linux, carry out crash dump.
>      # echo c > /sys/sysrq-trigger
>  3.On 2nd kernel, extract memory dumpfile.
>      # makedumpfile -E -X /proc/vmcore dumpfile.core
>  4.Reboot Xen and execute the following command.
>    And the above errors occurred.
>      # crash /boot/xen-syms-3.3-unstable dumpfile.core
> I can read the same memory dumpfile by crash command with no error to
> debug vmlinux.
> Thanks,
> --
> Yuji Shimada
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

Itsuro ODA <oda@xxxxxxxxxxxxx>

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