Return 0 if there is no CFP on the EC yet #7116
Merged
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StackProf uses a signal handler to call
rb_profile_frames
. Signals are delivered to threads randomly, and can be delivered after the thread has been created but before the CFP has been established on the EC.This commit returns early if there is no CFP to use.
Here is some info from the core files we are seeing. Here you can see the CFP on the current EC is 0x0:
Here is where VM_FRAME_CFRAME_P gets a 0x0 CFP:
Down the stack we can see this is happening after thread creation: