ljmf00 added a comment.

In D117928#3262656 <https://reviews.llvm.org/D117928#3262656>, @JDevlieghere 
wrote:

> Why are we disabling a lldb test because of a bug in GDB?

Because GDB is used on systems that don't implement a `RegisterContext`. I 
added an inline comment about Darwin and Windows XFAIL, as I'm not sure if this 
is just Linux specific. See here 
https://github.com/llvm/llvm-project/blob/main/lldb/source/Plugins/Process/gdb-remote/GDBRemoteRegisterContext.cpp#L296
 . Take a look at the issue. You can also reproduce this with `register 
write`/`register read` right after.

This ended up breaking my testsuite for a long time, since my server has an 
x86-64-v2 CPU, instead of an x86-64-v3. The buildbots seem to have at least 
x86-64-v3. As described by the issue I tested this on an AVX capable machine 
(x86-64-v3) and virtualized an older CPU to reproduce in a clean environment.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D117928/new/

https://reviews.llvm.org/D117928

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