SIGSEV crash when initializing CEF with unsupported lang (ie. LANG=foo)

[odinho]

Platform

Operating system and version: Ubuntu 20.10
OBS Studio version: OBS Studio - 26.1.1 (linux) (from official Ubuntu PPA: 26.1.1-0obsproject1~groovy)
LANG = nn_NO.UTF-8

Expected Behavior

Should be able to add Browser plugin. (this is not about opening up a file picker, can't get that far)

Current Behavior

Crashes with segmentation fault in libcef.so.

Somewhat useful stack trace:

Thread 1 "obs" received signal SIGSEGV, Segmentation fault.
GetTextDirectionForLocaleInStartUp () at ../../base/i18n/rtl.cc:205
205	../../base/i18n/rtl.cc: No such file or directory.
(gdb) bt
#0  GetTextDirectionForLocaleInStartUp() () at ../../base/i18n/rtl.cc:205
#1  0x00007fffa39d14fc in ICUIsRTL () at ../../base/i18n/rtl.cc:166
#2  IsRTL() () at ../../base/i18n/rtl.cc:155
#3  0x00007fffa461ccad in AdjustParagraphDirectionality () at ../../ui/base/l10n/l10n_util.cc:282
...
#24 0x00007fffa3744445 in CefInitialize() () at ../../cef/libcef/browser/context.cc:251
#25 0x00007fffa16f9457 in cef_initialize() () at ../../cef/libcef_dll/libcef_dll.cc:112
#26 0x00007fffacbcb36b in  () at /usr//lib/obs-plugins/obs-browser.so

Steps to Reproduce

1. Run LANG=foo obs (I had nn_NO.utf8, but seems you just need something CEF doesn't support)
2. Right-click in sources and choose "Add source -> Browser"
3. Dialog Create/Select Source come up, it says "Create new"
4. Click "OK" -> CRASH

Additional information

It works on my other laptop which is Ubuntu 20.04. It also has nn_NO.UTF-8, but I don't have it here, so can't check if there's any relevant differences.

The obs log:

• Crash backtrace with debug symbols for CEF
• old obs-crash.log (no debug symbols, useless)

[Gol-D-Ace]

https://cef-builds.spotifycdn.com/cef_binary_76.1.13%2Bgf19c584%2Bchromium-76.0.3809.132_linux64_minimal.tar.bz2

You could try replacing your libcef.so with the one from this build. It's the build that the PPA is using but not stripped and probably? has the debug symbols.

[odinho]

@Gol-D-Ace Thank you so much! That helped me find a workaround. It's due to localization! This works:

LC_ALL=C obs

I don't know if it's because CEF supports nn_NO.UTF-8, or because OBS does, or because none of them do or what it is. But this means it should be possible to reproduce the crash with some testing! :)

obs_crash_locale.log

[odinho]

So figured out a even smaller test case which should work, just start with LANG=whatever obs, and it should crash! ^_^

[Gol-D-Ace]

Could you test if this happens with the unstable PPA version?

sudo add-apt-repository ppa:obsproject/obs-studio-unstable
sudo apt-get update
sudo apt install obs-studio

The unstable PPA is using a newer CEF version.

[odinho]

Still crashes.

But LC_ALL=foo LANG=foo obs actually now works, maybe because obs falls back to "C" automatically now when the lang isn't recognized:

$ LC_ALL=foo LANG=foo obs

(process:112771): Gtk-WARNING **: 18:13:27.694: Locale not supported by C library.
	Using the fallback 'C' locale.

However, when using my nn_NO.UTF-8 standard locale, it crashes. Maybe because OBS accepts it, but CEF doesn't.