Mumble overlay does not work

[3JlOy-PYCCKUi]

Description

There is an error, related to LD_PRELOAD, when trying to run the overlay. My distro is Arch Linux, mumble installed from official repositories.

Steps to reproduce

1. Try to start mumble overlay

Mumble version

1.4.287

Mumble component

Client

OS

Linux

Reproducible?

Yes

Additional information

No response

Relevant log output

$ LANG=C.UTF-8 mumble-overlay glxgears
set
set
Unable to find symbol malloc. Aborting.
/usr/bin/mumble-overlay: line 69:  5583 Aborted                 LD_PRELOAD="${MUMBLE_PRELOAD} ${LD_PRELOAD}" "${@}"

Screenshots

No response

[3JlOy-PYCCKUi]

Overlay does not work with other programs either:

Minetest

2022-10-17 19:15:08: [Main]: Automatically selecting world at [/home/USERNAME/.minetest/worlds/testworldname]
2022-10-17 19:15:08: ERROR[Main]: Audio: Global Initialization: Failed to open device
/usr/bin/mumble-overlay: line 69: 16217 Segmentation fault      LD_PRELOAD="${MUMBLE_PRELOAD} ${LD_PRELOAD}" "${@}"

Gzdoom

gzdoom: symbol lookup error: /usr/lib64/mumble/libmumbleoverlay.x86_64.so: undefined symbol: glPopClientAttrib

Xeyes

xeyes: symbol lookup error: /usr/lib64/mumble/libmumbleoverlay.x86_64.so: undefined symbol: glPopClientAttrib

I couldn't find any program at all with which I was able to run overlay

[Krzmbrzl]

@davidebeatrici any idea?

[Krzmbrzl]

@3JlOy-PYCCKUi could you try running the overlay + application through gdb, so we can get a backtrace of the crash?

[3JlOy-PYCCKUi]

@3JlOy-PYCCKUi could you try running the overlay + application through gdb, so we can get a backtrace of the crash?

I can, but i don't know how

like mumble-overlay gdb xeyes? i get error: gdb: symbol lookup error: /usr/lib64/mumble/libmumbleoverlay.x86_64.so: undefined symbol: glPopClientAttrib

if i try gdb --args mumble-overlay xeyes i get: "/usr/bin/mumble-overlay": not in executable format: file format not recognized

[Krzmbrzl]

Ah yes, right. mumble-overlay is only a wrapper script... :facepalm:

[radioactiveman]

Have you installed lib32-glibc? It's an opt-dependency for Mumble and is needed for mumble-overlay.

https://archlinux.org/packages/community/x86_64/mumble/

[Krzmbrzl]

@3JlOy-PYCCKUi some things that come to my mind: The overlay not finding glPopClientAttrib most likely means that the target program was not linked against OpenGL, which is a requirement for the overlay to work.

What goes on in the minetest case, I don't know. But for your original problem it might bw that the program uses a custom memory allocator instead of malloc, which would explain why that symbol can't be found...

[Krzmbrzl]

Oops, I accidentally deleted the comment of OP confirming that lib32-glibc is indeed installed.

[3JlOy-PYCCKUi]

https://github.com/mumble-voip/mumble/pull/5949 partially solves the problem by applying the patch from this pull-request, I was able to run minetest with the overlay, but everything else still does not work, also I tested the overlay with games from steam (via proton and native), also does not work

[Krzmbrzl]

Afaik steam games use Vulkan, which is not supported by our overlay.

For those games that still don't work, are the error messages as before?

[3JlOy-PYCCKUi]

glxgears is working too gzdoom, xeyes still don't work, error is the same

[Krzmbrzl]

gzdoom and xeyes probably don't use OpenGL and therefore it is expected that they don't work

[Green-Sky]

vulkan layer when?

[Krzmbrzl]

When someone finds time and motivation to implement it :P There is a dedicated ticket somewhere here on GitHub - it's rather old already though (iirc) :thinking:

[cedarmax]

Is there any way to just make the Mumble overlay always present, regardless of a game being open? I have the same issue.

[Krzmbrzl]

I don't think so. The overlay hooks into the graphics call of the game to do its rendering, so you have to have a game running for it to work.

[Green-Sky]

I don't think so. The overlay hooks into the graphics call of the game to do its rendering, so you have to have a game running for it to work.

except for vulkan, which could, if implemented, be installed as a systemwide layer.

[cedarmax]

I don't think so. The overlay hooks into the graphics call of the game to do its rendering, so you have to have a game running for it to work.

It is suggested here that this is possible: https://github.com/mumble-voip/mumble/issues/1273#issuecomment-46081763 On Windows it is possible to have the overlay always present. I'm trying to get the overlay to work with TF2 but the issue according to others seems to be that mumble is 64 bits, steam is 64 bits, but TF2 is 32 bits. Not that the overlay works in any other game, anyways.