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Created attachment 10734 [details]
In mono-4.0.0-branch/9236ac4 and master/4fc75b3, CultureInfo.DateTimeFormat will throw a NullReferenceException for the ar-SA culture (only, it seems), if obtained via CultureInfo.GetCultures(CultureTypes.SpecificCultures). This is a regression from 3.12.0.
I don't know if it's relevant that ar-SA is the first culture returned by CultureInfo.GetCultures(CultureTypes.SpecificCultures), probably not. (That's also true in 3.12.0.)
This does not happen with any other culture, including ar-SA returned via CultureInfo.GetCultures(CultureTypes.AllCultures) or CultureInfo.GetCultureInfo("ar-SA").
A simple reproduction is attached. In 4.0.0/master, this prints:
Failed for culture ar-SA
System.NullReferenceException: Object reference not set to an instance of an object
at System.Globalization.DateTimeFormatInfo.get_OptionalCalendars () [0x0000b] in /home/malcolm/mono/mono-git/external/referencesource/mscorlib/system/globalization/datetimeformatinfo.cs:715
at System.Globalization.DateTimeFormatInfo.set_Calendar (System.Globalization.Calendar value) [0x00140] in /home/malcolm/mono/mono-git/external/referencesource/mscorlib/system/globalization/datetimeformatinfo.cs:632
at System.Globalization.DateTimeFormatInfo..ctor (System.Globalization.CultureData cultureData, System.Globalization.Calendar cal) [0x00022] in /home/malcolm/mono/mono-git/external/referencesource/mscorlib/system/globalization/datetimeformatinfo.cs:355
at System.Globalization.CultureInfo.get_DateTimeFormat () [0x0002d] in /home/malcolm/mono/mono-git/mcs/class/corlib/System.Globalization/CultureInfo.cs:542
at Program.Test (System.Globalization.CultureInfo ci) [0x0000a] in /home/malcolm/mono/repro2/Program.cs:27
Fixed in master
I am able to reproduce this issue with latest Mono 18.104.22.168 but this is C5 latest build as we don't have mono in Master dropbox. Here is the screencast to reproduce the issue : http://www.screencast.com/t/EHkkWIvmokZq\
Please provide the Master Mono where we can verify this issue.
I have verified this issue on Master branch Mono 22.214.171.1243 and observed that now I am not getting any exception for CultureInfo.GetCultures(CultureTypes.SpecificCultures). Screencast for the same : http://www.screencast.com/t/NOFpmGQpz
Environment Info : https://gist.github.com/Shruti360/4ce6bce69c785afab959
I also checked this issue on C5 Mono and did not face any exception with Mono 126.96.36.199 also. Screencast regarding same : http://www.screencast.com/t/sx6tWgGKZz
Environment Info : https://gist.github.com/Shruti360/3fce96c3932f6faefb56