[Bug 46472] Linux kernel 4.19 breaks startup of BO2 due to change in PTRACE_POKEUSER hw breakpoint behavior

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46472

--- Comment #41 from tjb <troyb at us.ibm.com> ---
(In reply to Anthony Jagers from comment #40)
> I'm looking for a good 4.18 kernel tree. Greg K-H EOL'd his branch.
> I tried Ubuntu's but they have modified the build system and it needs
> system utilities which I don't have.

I bisected using the last 4.18 version on kernel.org, i.e.
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/linux-4.18.19.tar.xz 

It is also possible to just modify kernel/events/hw_breakpoint.c with the code
I posted in this thread and configure it for new or old breakpoint behavior
with the conditional compile, it will work the same way as unpatched 4.18
regarding the ptrace behavior.  I have been running reverted linux 4.19 for
many weeks with no issues found.

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