linux-kernel - Re: Linux doesn't create /proc/vmcore

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Date:	Tue, 21 May 2013 08:42:31 +0900
From:	Atsushi Kumagai <kumagai-atsushi@....nes.nec.co.jp>
To:	matt.henry.stuart@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Linux doesn't create /proc/vmcore

Hello matt,

> CONFIG_PROC_VMCORE=y

Is it specified for the capture kernel ?
By any chance, did you run kdump-config on the system kernel,
not on the capture kernel ?

> DESCRIPTION
>       kdump-config manages the kdump feature of the  Linux  kernel.   When  a
>       kdump  enabled  kernel panics, it immediately boots into a clean kernel
>       called the kdump kernel.  The memory image of the panicked kernel  will
>       be  presented  in  /proc/vmcore  while  the  kdump  kernel (or "capture
>       kernel") is running.

/proc/vmcore doesn't be created on the system kernel, this tool should be
run on the capture kernel.

And this document may help you:

  Documentation/kdump/kdump.txt


Thanks
Atsushi Kumagai

> 
> my error on the kdump:
> kdump-config savecore
> running makedumpfile -c -d 31 /proc/vmcore
> /var/crash/201305180259/dump-incomplete.
> open_dump_memory: Can't open the dump memory(/proc/vmcore). No such
> file or directory
> 
> makedumpfile Failed.
> kdump-config: makedumpfile failed, falling back to 'cp' ... failed!
> cp: cannot stat `/proc/vmcore': No such file or directory
> kdump-config: failed to save vmcore in /var/crash/201305180259 ... failed!
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