Unhandled Page fault on write access - Wine 4.4 - NetBSD i386

[zerous]

Hi,

Wine-4.4 throws Unhandled Page fault on write access errors on NetBSD
i386 -current. I did some debugging and found that it was due to
_lwp_makecontext(3) segfaulting as it tried to access memory that was
out-of-bounds. However, the real reason was pthread_attr_setstack(3)
setting up a guard of 65536 bytes which Wine didn't account for. I am
aware that the manpage of pthread_attr_setstack(3) is dated and it
states that no default guard will be allocated. I will indeed send a
patch to amend that. In order to work around the issue, I have tried
setting the guard to 0 explicitly using
pthread_attr_setguardsize(3). As far as I know this change shouldn't
affect any other platforms. Additionally, it also solves the initial
problem I had, which was wine giving me black windows instead of the
UI; an inadvertent side-effect of the same issue.


OK?
-- 
zerous

[zerous]

On Mon, Jun 03, 2019 at 06:15:18PM +0200, zerous wrote:
> Hi,
>
> Wine-4.4 throws Unhandled Page fault on write access errors on NetBSD
> i386 -current. I did some debugging and found that it was due to
> _lwp_makecontext(3) segfaulting as it tried to access memory that was
> out-of-bounds. However, the real reason was pthread_attr_setstack(3)
> setting up a guard of 65536 bytes which Wine didn't account for. I am
> aware that the manpage of pthread_attr_setstack(3) is dated and it
> states that no default guard will be allocated. I will indeed send a
> patch to amend that. In order to work around the issue, I have tried
> setting the guard to 0 explicitly using
> pthread_attr_setguardsize(3). As far as I know this change shouldn't
> affect any other platforms. Additionally, it also solves the initial
> problem I had, which was wine giving me black windows instead of the
> UI; an inadvertent side-effect of the same issue.

Hi,

I have tested the following patch against wine-4.13 on NetBSD, FreeBSD
and Linux and it seems to work fine.

OK?

-- 
zer