[Bug 1577554] Re: pxelinux.0 - Failed to load ldlinux.c32

[Wouter Hanegraaff]

The workaround of copying ldlinux.c32 does not work.  The problem as
documented upstream in
http://www.syslinux.org/archives/2015-September/024305.html still
exists; see below my configuration*.

What happens after copying ldlinux.c32 to /tftpboot:
- the system attempts to execute the default boot option from the pxelinux.cfg/default menu, no matter what I type at the boot prompt
- if I make booting a kernel over http the default option, boot fails with the message:
"Loading http:////nl.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/linux... failed: No such file or directory" (no matter what I type at the boot prompt)

What happens after removing /tftpboot/ldlinux.c32 and copying gpxeboot.0 from an ubuntu 14.04 machine:
- system boots as expected.


*) I'm using the following config: 
Ubuntu release:
Description:	Ubuntu 16.04.2 LTS
Release:	16.04
pxelinux:
  Installed: 3:6.03+dfsg-11ubuntu1

- dnsmasq: 
dhcp-boot=gpxelinux.0
enable-tftp
tftp-root=/tftpboot
log-dhcp

dhcp-range=10.38.18.10,10.38.18.100
- /tftpboot/gpxelinux.0 copied from /usr/lib/PXELINUX/gpxelinux.0
- /tftpboot/pxelinux.cfg/default:
DEFAULT l

LABEL l
        localboot 0

prompt 1
timeout 1200

LABEL xenial64
 kernel http://nl.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/linux 
 append initrd=http://nl.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/initrd.gz ramdisk_size=16432 root=/dev/rd/0 rw console-setup/ask_detect=false console-setup/layoutcode=us debian-installer/locale=en_US.UTF-8 debconf/priority=critical --

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https://bugs.launchpad.net/bugs/1577554

Title:
  pxelinux.0 - Failed to load ldlinux.c32

Status in syslinux package in Ubuntu:
  Confirmed

Bug description:
  Hi there,

  This is an independantly confirmed upstream bug, which occurs in
  version 6.0.3 of syslinux / plxelinux upsteram sources. The fix has
  already been committed to upstream, and can be found here:

  http://www.syslinux.org/archives/2015-September/024305.html

  If you read back the above thread, it explains pretty much everything
  about the bug in question. I myself encountered this bug today, whilst
  using the current official ubuntu syslinux pkg. Which is to say this
  one:

  https://launchpad.net/ubuntu/+source/syslinux/3:6.03+dfsg-8ubuntu2

  While being on ubuntu 15.10 wily.

  Now xenial says:

  https://launchpad.net/ubuntu/+source/syslinux/3:6.03+dfsg-11ubuntu1

  Which is like minor patch revisions but still based on same 6.03
  release upstream srcs? And hence the bug probably still exists in
  xenial. So you will probably need to either increment the upstream
  release version in your pkg to include the fix commit. Or else local
  manual patch onto buggy 6.0.3 release.

  Many thanks.

  ====
  To reproduce Error condition (it is the same as in the mailinglist thread):

  * Install pxelinux pkg from official ubuntu.
  * Copy pxelinux.0 + ldlinux.c32 --> pxe / tftp http web root
  * Make a Net Boot entry for pxelinux.0 in ipxe.

  As described here: http://jpmens.net/2011/07/18/network-booting-
  machines-over-http/

  #!ipxe
  imgfree
  set 210:string http://10.0.12.249/pxe/
  set 209:string http://10.0.12.249/pxelinux.php?MAC=${net0/mac}&ip=${ip}
  set filename ${210:string}pxelinux.0
  chain ${filename} ||
  echo Netboot failed
  shell

  * pxe boot (network boot) in a virtualbox vm on same local lan (using bridged network adapter) --> ipxe
  * have ipxe load with the above #!ipxe config file to in turn boot --> into pxelinux.0 (from ubuntu 6.0.3 syslinux pkg)
  * pxelinux fails to use http etc. Due to a mis-commit (developer testing hack not put back) in their 6.0.3 code base.

  Error msg:

  Failed to load ldlinux.c32
  (execution stops)

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