[Bug 29384] Multiple applications expect correct handling of WRITECOPY memory protection (Voobly fails to launch Age of Empires II, MSYS2)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=29384

--- Comment #87 from Zhiyi Zhang  ---
(In reply to testator from comment #85)
> I compiled wine-staging-9.6 with the userfaultfd patch again but this time with far less aggresive optimization flags,
> e.g no lto or -O3. It results in battle.net launching in staging-9.6 with userfaultfd to the same thing as vanilla wine

It's possible that wine compiled with LTO or -O3 can cause segfault. It's not a
well-tested config. Wine doesn't officially support LTO.
Also, there are some compilers in the past that have bugs even -Og so it's also
possible with -O3. Anyway, your result
suggests the userfaultfd patch is not at fault here.