<div dir="ltr"><div>Elisabetta, I will not answer your question directly.</div><div>However I think that everyone has heard of the Meltdown bug by now, and there are updated kernels being made available for this.</div><div>You should have a look on the Debian pages to see what they are saying about this, and choose which kernel you need on your head node.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 9 January 2018 at 14:17, Steffen Grunewald <span dir="ltr"><<a href="mailto:steffen.grunewald@aei.mpg.de" target="_blank">steffen.grunewald@aei.mpg.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>On Tue, 2018-01-09 at 13:16:12 +0100, Elisabetta Falivene wrote:<br>
> Root file system is on the master. I'm being able to boot the machine<br>
> changing kernel. Grub allow to boot from two kernel:<br>
><br>
><br>
> kernel 3.2.0-4-amd64<br>
><br>
> kernel 3.16.0-4-amd64<br>
><br>
><br>
> The problem is with kernel 3.16, but boots correctly with 3.2.<br>
<br>
</span>Let me guess: you're running multi-socket systems, and the kernel<br>
version behind that "3.16.0-4" label is 3.16.51-2, not 3.16.43-2?<br>
There seems to be an issue with that latest kernel update in Debian<br>
Jessie, mainly affecting multi-socket machines, but since Dec 4<br>
when this kernel package (set) was released I haven't seen any<br>
updates or fixes.<br>
Would using the jessie-backports kernel (4.9.x) be an option for you?<br>
<br>
Cheers,<br>
S<br>
<br>
</blockquote></div><br></div>