The problem is that with perf the stack trace is collected by the kernel (when the interrupt from the performance counters fires), and the kernel doesn’t implem

The problem is that with perf the stack trace is collected by the kernel (when the interrupt from the performance counters fires), and the kernel doesn’t implement dwarf unwinding of user space code. It _could_, but the kernel folks have made it pretty clear they don’t want to put any code related to dwarf in the kernel.