• Xcode version: 10
• Firebase SDK version: 6
• Firebase Component: Storage
• Component version: All of them

Calling Storage.reference(...).putFile throws EXC_BAD_ACCESS with a reference to

 - (void)dispatchAsync:(void (^)(void))block {
  dispatch_async(self.dispatchQueue, block);
}

The correct way to call this is Storage.storage().reference(). Lots of people are pretty confused. See this post and this.

I feel like a runtime warning would be appropriate if it can be done. I think the self variable is null in this case.