JITBugRepro

Segfaults on Ubuntu ARM64, works fine on my Windows X64 machine

Runtime

• .NET 7 RC 1

Suspects

• Executing project using NonBlocking.ConcurrentDictionary bundled in referenced project

• Services.GetRequiredService<MemberDB>() calls into ctor, which calls ConnectionPool.CreateOrGetConnection("") which reads from a static readonly NonBlocking.ConcurrentDictionary field

• Services.GetRequiredService<InvitesModule>().OnReady() contains a foreach loop that writes into a NonBlocking.ConcurrentDictionary. The write happens after an await, which might also be responsible for the weird behavior

• This bug seems to be caused by tiered compilation ( GDB mentioned TC and threadpool thread )

This is now a live issue @ dotnet/runtime#76051