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commit 43fe4bc236d667257eeebfb4f6bcbe2b92aea455
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Author: Mark Wielaard <mark@klomp.org>
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Date:   Fri Dec 14 14:32:27 2018 +0100
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    arm64: Fix PTRACE_TRACEME memcheck/tests/linux/getregset.vgtest testcase.
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    The sys_ptrace post didn't mark the thread as being in traceme mode.
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    This occassionally would make the memcheck/tests/linux/getregset.vgtest
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    testcase fail. With this patch it reliably passes.
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diff --git a/coregrind/m_syswrap/syswrap-arm64-linux.c b/coregrind/m_syswrap/syswrap-arm64-linux.c
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index 9ef54b4..650f5b9 100644
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--- a/coregrind/m_syswrap/syswrap-arm64-linux.c
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+++ b/coregrind/m_syswrap/syswrap-arm64-linux.c
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@@ -499,6 +499,9 @@ PRE(sys_ptrace)
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 POST(sys_ptrace)
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 {
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    switch (ARG1) {
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+   case VKI_PTRACE_TRACEME:
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+         ML_(linux_POST_traceme)(tid);
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+         break;
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    case VKI_PTRACE_PEEKTEXT:
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    case VKI_PTRACE_PEEKDATA:
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    case VKI_PTRACE_PEEKUSR: