RTLD_DEFAULT on main thread in Xcode 16

[mortenkleveland]

Description

I get the following warnings on NewRelic.start(:) in Xcode 16:

Steps to Reproduce

Call NewRelic.start(withApplicationToken:_) from Xcode 16

I tried to call .start on a background thread, but that doesn't work.

[cdillard-NewRelic]

Thank you for reporting this warning that is occurring with Xcode 16. We've added a JIRA ticket to our JIRA system for investigating and hopefully fixing this. Is this blocking your ability to use the agent with iOS 18? Please feel free to let us know any more detail or contact New Relic Support. Thanks!

[mortenkleveland]

Superb, thanks! It seems so far like the agent works fine with iOS 18.

[mbruin-NR]

@mortenkleveland In my testing I am not seeing this warning when using Xcode 16. Are you starting the agent in the didFinishLaunchingWithOptions function in the AppDelegate? Are you enabling any special diagnostic tools? Can you think of anything else that could be different in your project or send us a small example app that reproduces the issue?

[mortenkleveland]

@mbruin-NR Thanks for looking at it! I am starting the agent in application:didFinishLaunchingWithOptions, yes.

However, that's interesting, I'll try to make a minimal example project and see if it is reproducable and come back to you.

[shravanteegala]

i get the memory leak same method.( NewRelic.start(:) in Xcode 16.0).

[garethlloyd1994]

I am getting a lot of user crashes from this line - is anyone else experiencing crashes?

Line 95: NewRelic.start(withApplicationToken: newRelicToken)

[mbruin-NR]

I am getting a lot of user crashes from this line - is anyone else experiencing crashes?

Line 95: NewRelic.start(withApplicationToken: newRelicToken)

That crash is likely to do an interaction with another third party library. There is a correct way to swizzle a function so that it can be swizzled again, which our agent uses, however other libraries don't always do this. First thing to try is to make sure that you are starting the New Relic agent before any other. Also you should see if you can disable the parts of the other libraries you are using, disable anything that swizzles functions. Lastly you can disable that functionality in our agent using the feature flag NRFeatureFlag_InteractionTracing.