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This avoids an incorrect msan uninitialized memory report when using runtime.SetCgoTraceback when a signal occurs while the fifth argument register is undefined. See the issue for more details. Fixes #47543 Change-Id: I3d1b673e2c93471ccdae0171a99b88b5a6062840 Reviewed-on: https://go-review.googlesource.com/c/go/+/339902 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>