linux-kernel - Re: Determine version of kernel that produced vmcore

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Message-ID: <20070710130503.GD22862@suse.de>
Date:	Tue, 10 Jul 2007 15:05:03 +0200
From:	Bernhard Walle <bwalle@...e.de>
To:	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Determine version of kernel that produced vmcore

* Neil Horman <nhorman@...hat.com> [2007-07-10 14:12]:
> On Tue, Jul 10, 2007 at 11:14:14AM +0300, Dan Aloni wrote:
> > On Tue, Jul 10, 2007 at 12:18:17PM +0530, Vivek Goyal wrote:
> > > On Fri, Jul 06, 2007 at 05:58:04PM +0300, Dan Aloni wrote:
> > > > 
> > >[..]
> > > > It contains enough information in order to make a compact kernel
> > > > dump (makedumpinfo needs to go over the struct page arrays). As
> > > > you see, it also contains the kernel version.
> > > > 
> > > 
> > > But this will not solve Bernhard's problem where looking at a vmcore
> > > he wants to know which vmlinux (kernel version with time stamp) has
> > > generated this vmcore. So adding a ELF NOTE should help.
> > 
> > That, or pass it in *runtime* by other means.
> Wait a second,  I may have been confused before.  Do you want to know the
> version of the crashing kernel when you look at a core in the crash utilty, or
> do you want to know it when you are capturing the crash?  If you want the
> former, then an ELF NOTE would be perfect.  If you want to know the latter, my
> suggestion would be to simply modify mkdumprd to place the name of the crashing
> kernel, along with its version directly into the kdump initramfs init script.
> We can use makedumpfile or readelf to fish out the utsname and just embed it.
> Either approach is rather easy to do I think, the former would require a kernel
> modification, while the latter would require some extra scripting.

Well, mkdumprd is RedHat specific. (We use the normal mkinitrd for
this.) 

Also, I don't want to rebuild the initrd of the kdump kernel just only
after changing the running kernel. That would require to rebuild the
initrd for the kdump kernel on *every* boot of a kernel that's another
version than the last booted kernel.



Thanks,
   Bernhard
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