Crash on UE4Editor startup

Development Platform & Builds
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1

For the past week or so, I have been unable to use the UE4 editor because every revision I compile crashes during startup. I asked on the #UE4Linux channel and was told by Yaakuro that TLS (Thread Local Space) was broken again.

Console output from starting up the UE4 editor:

2

We discussed that over IRC, but in a nutshell:

  • editor shared objects have static TLS (why exactly this happens despite us passing -ftls-model=local-dynamic is yet unknown)
  • glibc has a total limit of 14 static TLS slots (bumped up to 32 in Ubuntu 15.04 and Fedora): Carlos O'Donell - Fixing the distribution problems with TLS and DTV_SURPLUS slots.
  • on Ubuntu 14.04 and up our shared objects + whatever system shared objects happen to use static TLS as well together still use fewer slots than the system limit (14 or 32).
  • on Arch apparently this is not the case.

Proper fix is making editor shared objects not to use static TLS. Short term fix would be patching Arch glibc to increase DTV_SURPLUS.

3

Okay, so suppose I were to try recompiling glibc with an increased DTV_SURPLUS… As far as you know, would you know, would that require that I recompile everything that depends on glibc? Or would just toggling that be “safe” because it would leave the interfaces unchanged?

4

For gentoo user who are seeing this thread it’s pretty straight forward:

su -
mkdir -p /etc/portage/patches/sys-libs/glibc
cd  /etc/portage/patches/sys-libs/glibc
curl http://pastebin.com/download.php?i=BQv7cqKt > unreal48glibc.patch #I did this for you ;)
emerge -v glibc

problem solved
Hope that help…

5

Thank you very much! This patch was close, but didn’t apply correctly to glibc-2.20-r2, so here is an updated one: unreal48glibc-2.20-r2.patch - Pastebin.com

6

I seem to to have a similar problem, running debian jessie.

full output is here: Using binned.Increasing per-process limit of core file size to infinity.[201 - Pastebin.com

ubuntu solution does’nt work.
any chance anyone can help?

7

Your issue is unrelated to the one I reported. My reported crash was exhaustion of Thread Space Locals. Your issue is a failure to create an openGL context. In which case, it would be best to file a new report.