Re: [PATCH] Fix x86_64 TIF_SYSCALL_TRACE race in entry.S

[Andi Kleen]

Mathieu Desnoyers <compudj@xxxxxxxxxxxxxxxxxx> writes:

> We make sure that the thread flag read is coherent between our new test and the ALLWORK_MASK test by first saving it in a register used for both comparisons.
>

That doesn't make sense. If someone is setting those asynchronously you 
can always race.

You should really just stop the process like ptrace does before changing
such things.

-Andi

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