RetroArch segfaults when scanning any directory for games

[kevinfishburne]

I tried this with current builds in both the stable and testing PPA's on Linux Mint 17.3 amd64. It even crashes scanning an empty directory, so it's not bad ROMs. I also deleted the config file in ~/.config/retroarch, so it's not a settings file issue. RetroArch worked on my system a couple of weeks ago until reinstalling it from PPA tonight. Any ideas on how to gather more information about the crash? The terminal simply outputs "Segmentation fault". dmesg reports "error 4 in retroarch".

[hizzlekizzle]

Launching from a terminal with --menu --verbose will give you a full output to the console. You can also try running it through gdb for more information.

[kevinfishburne]

--menu --verbose display a lot of output, but nothing just before the crash:

kevinfishburne@codex:~$ retroarch --menu --verbose
RetroArch [INFO] :: === Build =======================================
Capabilities: MMX MMXEXT SSE1 SSE2 SSE3 SSSE3 SSE4 SSE4.2 AVX AES
Built: Jun 12 2016
RetroArch [INFO] :: Version: 1.3.4
RetroArch [INFO] :: =================================================
RetroArch [INFO] :: Looking for config in: "/home/kevinfishburne/.config/retroarch/retroarch.cfg".
RetroArch [WARN] :: SYSTEM DIR is empty, assume CONTENT DIR
RetroArch [INFO] :: Config: loading config from: /home/kevinfishburne/.config/retroarch/retroarch.cfg.
RetroArch [INFO] :: Environ SET_PIXEL_FORMAT: RGB565.
RetroArch [INFO] :: Version of libretro API: 1
RetroArch [INFO] :: Compiled against API: 1
RetroArch [INFO] :: Set audio input rate to: 29975.00 Hz.
RetroArch [INFO] :: Video @ 960x720
RetroArch [ERROR] :: Failed to connect to Wayland server.
RetroArch [INFO] :: Found GL context: x
RetroArch [INFO] :: Detecting screen resolution 3840x1080.
RetroArch [INFO] :: [GLX]: X = 0, Y = 0, W = 960, H = 720.
RetroArch [INFO] :: [GLX]: Found swap function: glXSwapIntervalEXT.
RetroArch [INFO] :: [GLX]: glXSwapIntervalEXT(1)
RetroArch [INFO] :: [GL]: Vendor: NVIDIA Corporation, Renderer: GeForce GTX 750/PCIe/SSE2.
RetroArch [INFO] :: [GL]: Version: 4.4.0 NVIDIA 340.96.
RetroArch [INFO] :: Querying GL extension: ARB_ES2_compatibility => exists
RetroArch [INFO] :: Querying GL extension: ARB_sync => exists
RetroArch [INFO] :: Querying GL extension: ARB_texture_float => exists
RetroArch [INFO] :: Querying GL extension: EXT_texture_sRGB => exists
RetroArch [INFO] :: Querying GL extension: ARB_framebuffer_sRGB => exists
RetroArch [INFO] :: GL: Using resolution 960x720
RetroArch [INFO] :: [GL]: Default shader backend found: glsl.
RetroArch [INFO] :: [Shader driver]: Using GLSL shader backend.
RetroArch [INFO] :: Checking GLSL shader support ...
RetroArch [WARN] :: [GL]: Stock GLSL shaders will be used.
RetroArch [INFO] :: Found GLSL vertex shader.
RetroArch [INFO] :: Found GLSL fragment shader.
RetroArch [INFO] :: Linking GLSL program.
RetroArch [INFO] :: Found GLSL vertex shader.
RetroArch [INFO] :: Found GLSL fragment shader.
RetroArch [INFO] :: Linking GLSL program.
RetroArch [INFO] :: Found GLSL vertex shader.
RetroArch [INFO] :: Found GLSL fragment shader.
RetroArch [INFO] :: Linking GLSL program.
RetroArch [INFO] :: Found GLSL vertex shader.
RetroArch [INFO] :: Found GLSL fragment shader.
RetroArch [INFO] :: Linking GLSL program.
RetroArch [INFO] :: Found GLSL vertex shader.
RetroArch [INFO] :: Found GLSL fragment shader.
RetroArch [INFO] :: Linking GLSL program.
RetroArch [INFO] :: [GL]: Using 4 textures.
RetroArch [INFO] :: [GL]: Loaded 1 program(s).
RetroArch [INFO] :: [GL]: Using GL_RGB565 for texture uploads.
RetroArch [INFO] :: [udev]: Plugged pad: Logitech Logitech Dual Action (046d:c216) on port #0.
RetroArch [INFO] :: Autodetect: 0 profiles found
RetroArch [INFO] :: Autodetect: no profiles found for Logitech Logitech Dual Action (1133/49686)
RetroArch [INFO] :: [udev]: Pad #0 (/dev/input/event4) supports 0 force feedback effects.
RetroArch [INFO] :: [udev]: Plugged pad: USB Gamepad (0079:0011) on port #1.
RetroArch [INFO] :: Autodetect: 0 profiles found
RetroArch [INFO] :: Autodetect: no profiles found for USB Gamepad (121/17)
RetroArch [INFO] :: [udev]: Pad #1 (/dev/input/event15) supports 0 force feedback effects.
RetroArch [INFO] :: Found joypad driver: "udev".
RetroArch [INFO] :: Using font rendering backend: freetype.
RetroArch [INFO] :: Suspending screensaver (X11).
RetroArch [INFO] :: ALSA: Using signed 16-bit format.
RetroArch [INFO] :: ALSA: Period size: 768 frames
RetroArch [INFO] :: ALSA: Buffer size: 3072 frames
RetroArch [INFO] :: ALSA: Can pause: yes.
RetroArch [INFO] :: Found menu display driver: "menu_display_gl".
RetroArch [INFO] :: Querying GL extension: ARB_framebuffer_object => exists
RetroArch [INFO] :: Using font rendering backend: freetype.
RetroArch [INFO] :: Using font rendering backend: freetype.
RetroArch [INFO] :: SRAM will not be saved.
RetroArch [INFO] :: null: [/home/kevinfishburne/.config/retroarch/content_history.lpl].
RetroArch [INFO] :: [GL]: VSync => on
RetroArch [INFO] :: [GLX]: glXSwapIntervalEXT(1)
RetroArch [INFO] :: [GL]: VSync => on
RetroArch [INFO] :: [GLX]: glXSwapIntervalEXT(1)
Segmentation fault

Running it in gdb only displays this when it crashes:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000424184 in ?? ()

[kevinfishburne]

Turns out the retroarch package in synaptic fails to install as dependencies or even recommend the installation of any of the libretro packages. Issuing "sudo apt-get install libretro*" solves the problem, however after the ROMs are scanned RetroArch fails to add the relevant systems to the menu, so there's no way to access the scanned ROMs. Ideas?

[kevinfishburne]

Perhaps there is a discrepancy between the way Lakka configures RetroArch versus a vanilla RetroArch installation. Lakka automatically adds a system icon after ROMs are scanned, but vanilla RetroArch does not, requiring me to use "Load Content", "Select File And Detect Core", then manually browse to the ROM.

[kivutar]

Lakka uses vanilla retroarch, but we provide the database and the core infos out of the box. While in the vanilla retroarch you have to download those through the online updater, which is not very intuitive.

[kevinfishburne]

Not intuitive, but it works. Thank you. I may now be able to forgo Lakka and do a proper distro with the NVIDIA drivers for good output on my CRT television with RetroArch. Good information, but the "unintuitive" part should be modified so the user is prompted if they want to update the games database on first run or something.

[kivutar]

If you still like Lakka, you can learn how to compile it by yourself and customize it to suit your needs. For example, this pull request shows how to build Lakka with the proprietary NVIDIA drivers and X11 https://github.com/libretro/Lakka/pull/391/files

[kevinfishburne]

I do like Lakka; I reinstalled it yesterday after getting poor performance on the same machine using Mint 17.3 with the binary NVIDIA drivers, surprisingly. This question is probably beyond the scope of this bug report (which should be under PPA dependency recommendations), but is there a script to create a "testing" Lakka .img with 391's X11 and/or proprietary driver additions? All I need is xrandr but I don't know how to compile Lakka from source or create a bootable image. The nouveau driver works amazingly well in Lakka. Nouveau and X11 with xrandr could control over/underscan compensation easily and it would be awesome.

[kivutar]

Yes, clone lakka, apply this PR, libretro/Lakka#391 and compile it following the instructions on the wiki.

[kevinfishburne]

@kivutar Okay, I suck at git. I've cloned Lakka and have a Lakka directory full of files. What command do I issue to apply the pull request, and do I issue it from within the Lakka directory (containing CHANGELOG, config, CONTRIBUTING.md, etc.) or some other directory?

[kevinfishburne]

Not too much code was changed, so I manually edited the source files to remove and add lines as necessary and am compiling now. Will report findings.

[kevinfishburne]

Got "checking for XML::Parser... configure: error: XML::Parser perl module is required for intltool" during compilation. Tried this to install perl "XML::Parser" module and am reattempting compilation:

http://mynixworld.info/2014/02/17/xmlparser-perl-module-required-intltool/

[kevinfishburne]

Failed the second time after burning 8 cores for nearly two hours with:

Resolving us.download.nvidia.com (us.download.nvidia.com)... 23.205.120.114, 23.205.120.128
Connecting to us.download.nvidia.com (us.download.nvidia.com)|23.205.120.114|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 38511679 (37M) [application/octet-stream]
Saving to: 'sources/xf86-video-nvidia/NVIDIA-Linux-x86_64-340.96-no-compat32.run'

100%[====================================================================================================================================================================================================>] 38,511,679 6.59MB/s in 6.3s

2016-06-21 01:42:45 (5.86 MB/s) - 'sources/xf86-video-nvidia/NVIDIA-Linux-x86_64-340.96-no-compat32.run' saved [38511679/38511679]

UNPACK xf86-video-nvidia
Creating directory build.Lakka-Generic.x86_64-devel/xf86-video-nvidia-340.96
Verifying archive integrity... OK
Uncompressing NVIDIA Accelerated Graphics Driver for Linux-x86_64 340.96.........................................................................................................................................................................................................
APPLY PATCH (common) /home/kevinfishburne/Lakka/Lakka/packages/x11/driver/xf86-video-nvidia/patches/xf86-video-nvidia-kernel-3.18.patch
patching file kernel/nv-drm.c
Hunk #1 succeeded at 17 with fuzz 2.
Hunk #2 succeeded at 119 with fuzz 2 (offset 4 lines).
BUILD xf86-video-nvidia (target)
make[1]: Entering directory '/home/kevinfishburne/Lakka/Lakka/build.Lakka-Generic.x86_64-devel/xf86-video-nvidia-340.96/kernel'
The kernel you are installing for is a PREEMPT_RT kernel!

The NVIDIA driver does not support real-time kernels. If you
are using a stock distribution kernel, please install
a variant of this kernel that does not have the PREEMPT_RT
patch set applied; if this is a custom kernel, please
install a standard Linux kernel. Then try installing the
NVIDIA kernel module again.

*** Failed PREEMPT_RT sanity check. Bailing out! ***

nvidia-modules-common.mk:201: recipe for target 'build-sanity-checks' failed
make[1]: *** [build-sanity-checks] Error 1
make[1]: Leaving directory '/home/kevinfishburne/Lakka/Lakka/build.Lakka-Generic.x86_64-devel/xf86-video-nvidia-340.96/kernel'
make: *** [image] Error 2
kevinfishburne@codex:~/Lakka/Lakka$

Complete terminal output from both failures is here:

http://eightvirtues.com/lakka/Lakka%20-%20Two%20Compile%20Fails%20in%20Mint%2017.3

[kivutar]

Ok, that's a problem. You need to revert the Real Time kernel patch we applied last week. Try to use git revert with the commit id, and launch compilation again.

[kevinfishburne]

There are five RT-related commits when I look here: https://github.com/libretro/Lakka/commits/lakka I ran the command "git checkout bd067b2db6a984857f841f08a70a8fc5537a8e69" which hopefully will "revert" the code back to the "Gamegirl, finalize inputs" commit on June 14th, just before all the RT commits. I checked a file and it appears to have worked (yes, I barely know what I'm doing). Compiling now; will report findings.