kexec on panic

Marc Milgram mmilgram at
Wed Feb 15 13:45:10 PST 2017

It is possible to boot into a new kernel as documented on the following 

That said, even though this is documented on a Red Hat page, Red Hat 
does not officially support it.


On 02/15/2017 12:29 PM, Clif Houck wrote:
> Is it possible to kexec on demand (not panic!) into another kernel with
> the idea being to avoid a reboot?
> For instance, say you had Linux running in a ramdisk, and all that
> ramdisk Linux did was lay down a bootable Linux image onto the main
> disk, and then awaited a command to kexec to the Linux image on disk? Is
> something like that possible? Would I still need to specially craft the
> initrd? If so, is there any literature available on how to do that?
> Thanks,
> Clif Houck
> On 2/10/2017 9:43 AM, Petr Tesarik wrote:
>> On Fri, 10 Feb 2017 10:14:02 +0200
>> Denys Fedoryshchenko <nuclearcat at> wrote:
>>> Hello,
>>> After years of using kexec and recent unpleasant experience with modern
>>> (supposed to be blazing fast to boot) hardware that need 5-10 minutes
>>> just to pass POST tests,
>>> one question came up to me:
>>> Is it possible anyhow to execute regular (not special "panic" one to
>>> capture crash data) kexec on panic to reduce reboot time?
>> No. But you can load a specially crafted panic initrd which kexec's
>> back to the production kernel.
>> HTH,
>> Petr T
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