[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 #42 from tjb <troyb at us.ibm.com> ---
(In reply to tjb from comment #41)
> (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.

Actually take that back.. I bisected from a git clone of Linus' kernel tree on
github which didn't even have the 4.18.19 version... Linus' tree doesn't seem
to incorporate the patch updates after a version release. The bisect was done
between release 4.18 stable and release 4.19 stable.  However I don't think
there was any code change from that version to 4.18.19 regarding the
hw_breakpoints.c code.

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