Michael Matz 9b2329f66c riscv64: Work around qemu bug ...

old qemu (before april 2020) have a bug in the layout of
struct ucontext, so we get invalid values under qemu-userspace emulation
when inspecting the signal context.  Try to recognize this and
graciously error out instead of segfaulting in the backtracer routines.

2020-07-15 23:11:58 +02:00

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