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e20145f12c
When throwing an Exception in the Fiber the backtrace generation crashes. This happens because backtrace does not func the stack bottom. Using '.cfi_undefined x30' tells the debug info that the value in the lr is unknown, which seems to be the nicest way to stop the unwinder. Setting x30 to 0 is another option, however it still creates one invalid frame in gdb, so the .cfi variant is used here instead. Backport from upstream druntime 2.083. Reviewed-on: https://github.com/dlang/druntime/pull/2308 From-SVN: r266470