[Bug 38953] New: Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

Bug ID: 38953
           Summary: Linux kernel version 4.2 will prevent Battle.net App
                    from launching in Wine
           Product: Wine
           Version: 1.7.47
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

When using Linux kernel version 4.2 (all of the release candidates exhibit this
phenomenon), the Battle.net will fail to launch in Wine (1.7.47). When
switching back to the stable 4.1.2, it will resume functioning as expected.

Obviously, this hints at an issue somewhere in the Linux kernel but,
ultimately, there is no way to bug report on kernel.org when the problem is one
individual application.

There have been some (very) low level changes in the Linux kernel between 4.1
and 4.2 and consequently, it may have affected Wine in some fashion. I suspect
something related to the low level ASM changes (see changelogs for the 4.2
rc's).

This was tested with all currently available release candidates for Linux
kernel version 4.2 (rc1, rc2, rc3).

Hardware: AMD A6-3650
Kernel versions: 4.1.2 amd64 low latency (works); 4.2rc1/rc2/rc3 amd64 low
latency (does not work)
Wine: 1.7.47
Graphics stack: Mesa 10.7 (git, oibaf).

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #1 from Austin English  ---
Attaching the output from wine when it fails to launch would be helpful.

However, given that the change was in the kernel (even if it only affects one
app), it would be very helpful to bisect the kernel:
https://www.kernel.org/pub/software/scm/git/docs/git-bisect-lk2009.html
https://wiki.ubuntu.com/Kernel/KernelBisection
https://wiki.gentoo.org/wiki/Kernel_git-bisect

see also wine's regression testing page for more info about git bisect:
http://wiki.winehq.org/RegressionTesting

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #2 from Armin Altorffer  ---
The offending event/output:

"wine: Unhandled page fault on write access to 0x0e03e9f6 at address 0x38607d98
(thread 004f), starting debugger..."

At which point it will simply abort execution and return to prompt. As stated,
4.1.x (and all versions prior) did not exhibit this phenomenon.

Personally bisecting the kernel is something that has always surprised me; even
though I do have the technical aptitude for it, it does remain something of a
time consuming and daunting process. It surprises me that people are requested
to personally do this sort of thing.

Moreover as in this particular case, the list of commits that is involved in
this phenomenon occurring is rather extensive. 4.1.2 is the last known working
kernel; 4.2.rc1 already sees it failing. The list of individual commits for
4.2.rc1 is quite extensive; it is one of the larger rc's in the history of the
Linux kernel. And as there are no individual compiles for each and every
individual commit, I would have to personally bisect the entire 4.2 rc1 kernel,
each individual commit. Compiling manually for every bisect attempt. Obviously,
it can be narrowed down a bit, but still, there are numerous possible causes.
Personally bisecting this on a less than cutting edge machine is probably going
to take weeks.

Most likely, it is related to low level ASM changes (a lot of work is being
done to migrate the low level ASM to C, in the kernel) but still, it could also
be related to some DRM work or maybe something else entirely.

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

Sebastian Lackner  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #3 from Austin English  ---
(In reply to Armin Altorffer from comment #2)
> Moreover as in this particular case, the list of commits that is involved in
> this phenomenon occurring is rather extensive. 4.1.2 is the last known
> working kernel; 4.2.rc1 already sees it failing. The list of individual
> commits for 4.2.rc1 is quite extensive; it is one of the larger rc's in the
> history of the Linux kernel. And as there are no individual compiles for
> each and every individual commit, I would have to personally bisect the
> entire 4.2 rc1 kernel, each individual commit. Compiling manually for every
> bisect attempt. Obviously, it can be narrowed down a bit, but still, there
> are numerous possible causes. Personally bisecting this on a less than
> cutting edge machine is probably going to take weeks.

You don't need to test every individual commit. Essentially, git bisect
automates the process of dividing the list of changes in half and testing the
midway point to find the broken commit, greatly reducing the needed number of
compiles (last time I bisected the kernel, I think it was around 15 compiles).

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #4 from Armin Altorffer  ---
Meet 4.2:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-rc1-unstable/CHANGES

On a AMD A6-3650? That would literally still take days of almost non-stop
building/installing/testing, straight off kernel.org's git of the kernel. No,
thank you very much. I am not THAT comfortable with git.

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

sobkas  changed:

What    |Removed                     |Added
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                 CC|                            |[e-mail]

--- Comment #5 from sobkas  ---
I have bisected kernel long time ago and filled
https://bugzilla.kernel.org/show_bug.cgi?id=101061

So apparently problems started with: 53e9accf0f7682d717c7b578b6e01fd297ba6630

Any idea how make kernel devs give a s*** about that bug?

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #6 from Armin Altorffer  ---
The best way for them to take the phenomenon seriously is by providing more
data, more samples, more evidence. It would also help if the wine devs
confirmed the bug and, consequently, confirmed it to the kernel devs. A major
project such as wine is cause enough to further investigate this particular
issue.

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

Austin English  changed:

What    |Removed                     |Added
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                 CC|                            |[e-mail]

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #7 from Armin Altorffer  ---
Pardon the double post but I have some additional test results. In response to
the aforementioned bug report for the kernel, which specifically mentioned
issues when running 32 bit applications on AMD64, I decided to create a new
prefix, a 64 bit prefix and to see if the Battle.net would then run properly on
4.2.x.

It does not.

And now, it does not even mention a specific error at which point it crashes;
it mentions the odd fixme here and there but no consistent one that would point
in a definite direction.

Of the last attempt I made to run it, the final message was:

"fixme:process:GetLogicalProcessorInformationEx (3,(nil),0x33ef3c): stub"

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

Ken Sharp  changed:

What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |UPSTREAM

--- Comment #8 from Ken Sharp  ---
If Linus himself responds it's safe to say that they're interested.

Upstream.

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

Rosanne DiMesio  changed:

What    |Removed                     |Added
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           See Also|                            |https://bugzilla.kernel.org
                   |                            |/show_bug.cgi?id=101061

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

--- Comment #9 from Armin Altorffer  ---
As of Release Candidate 4 of kernel 4.2 (July 26th 2015), the issue has been
resolved.

[Bug 38953] Linux kernel version 4.2 will prevent Battle.net App from launching in Wine

https://bugs.winehq.org/show_bug.cgi?id=38953

Austin English  changed:

What    |Removed                     |Added
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             Status|RESOLVED                    |CLOSED

--- Comment #10 from Austin English  ---
(In reply to Armin Altorffer from comment #9)
> As of Release Candidate 4 of kernel 4.2 (July 26th 2015), the issue has been
> resolved.

Fixed upstream > closing.