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

[Turbo Fredriksson]

> I'm not sure exactly what happened that started causing the segfaults,
> but it must have been a package update. As you note, libc6-udeb was last
> updated 2 weeks ago, so it doesn't make sense that it would only start
> causing issues this week. My suspicion is that something that depends on
> libc6-udeb is actually what was changed and is causing the fault.

My install image (with a modified boot meny, that loads the preseeding etc)
is about a year old now, so not sure what the correct fix is. Updating our
customised boot image would be a lot of work, so I’d prefer to have it
fixed “correctly” (whatever it is).

We haven’t used the image in several months, so didn’t notice until yesterday.
Just bad timing. But if it started happing just a few days ago (and you’ve been
running it successfully on the new libc6 package), then I agree it can’t be that..

> I'd be really interested in a technician description of what what went
> wrong here if anyone knows.

Yeah, me too!

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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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