[Bug 1816846] Re: segfault in libc-2.23.so netinstall installation pxe

[Turbo Fredriksson]

> we were able to just drop in the new kernel and initrd over top of the our previous
> ones and our menu configs and preseeds came forward without any tweaks.

When you put it like that, that sounds fairly simple and non-intrusive. I’m also
considering the impact as a whole - any new machines I create will be ever so
slightly different than the others. Probably doesn’t matter, but at the moment
we’re not in a super rush.

I’ll give it till Monday morning to see if the correct fix will arrive, otherwise I’ll
replace the kernel and initrd image.

> We know it was working as recently as 2019-02-19 and first saw issues with it
> shortly before 22:00 UTC on 2019-02-20.

That’s very specific time frame. Should be easy enough for the Ubuntu devs
to try to pinpoint exactly what happened in the repo and from that trace the
fault.

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https://bugs.launchpad.net/bugs/1816846

Title:
  segfault in libc-2.23.so netinstall installation pxe

Status in glibc package in Ubuntu:
  Confirmed

Bug description:
  I have implemented a PXE server in Virtualbox 6.0.4 to perform
  automatic installations of different versions of Linux (particularly
  Ubuntu).

  Until a few hours ago I could perform the automatic installation of
  Ubuntu Server 16.04.5 on a VM, but after updating libc6-udeb
  (2.23-0ubuntu11), I get the following error:

  kernel: [  186.927962] sh[8177]: segfault at 18 ip 00007fc21ff438df sp
  00007ffe594a5e80 error 4 in libc-2.23.so[7fc21ff23000+1c0000]

  I don't know how to fetch the installation log, so I attach a
  screenshot.

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