[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 #5 from tjb <troyb at us.ibm.com> ---
(In reply to Fabian Maurer from comment #1)
> AFAIK the linux kernel shouldn't break userland programs. Reverting the
> kernel commit fixed the issue? If so, did you already ask on the linux
> mailinglist?

To clarify further : There is some non-zero chance that the crash is actually
the "correct" behavior due to other unrelated bugs, and in the previous version
of the kernel (4.18 and below), the crash was not correctly trapped by the
kernel logic/userspace interaction.  This application only partially
functions... it runs for about 35 minutes in game mode (solo zombies) and then
freezes, sometimes with an "unhandled exception caught" message, but often just
a freeze of one of the game threads while other threads continue running. 
After the kernel commit in 4.19, it doesn't even start, just immediately states
"unhandled exception caught".  There is also the chance that the kernel commit
is just wrong... i.e. it changes semantics of the PTRACE_POKUSER in a way that
is now incorrect.

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