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process-backend: Don't swallow the original error in local::Backend::get_gen_regs/get_fp_regs #222
Description
We can see from Firefox Bug 1245570 the consequences of doing this. We can see that getfpregset() failed on an arm-linux-androideabi device, which swallowed the error and called getfpregs(), overwriting the original error with the practically-useless Error::NotSupported -- So now we have no idea why ptrace(PTRACE_GETREGSET, NT_ARM_VFP) failed.
(Even though the honest answer is that the kernel is so old that it probably didn't exist yet).
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