Except for that one repeatable machine, the problem always "went away" upon
retry (the same behavior you all have reported). That one machine was able
to repro more than once in a row, and after about four days I even got it to
repro in the debugger. That's when I finally discovered exactly what was
happening, and then I was able to stage a repro at will.

I submitted the fix to WiX, and a couple of weeks later walked another team
through their attempts to verify the fix.

Blair

-----Original Message-----
From: Christopher Painter [mailto:chr...@iswix.com] 
Sent: Wednesday, January 25, 2012 11:57 AM
To: Neil Sleightholm; General discussion for Windows Installer XML toolset.
Subject: Re: [WiX-users] Two Wierd Installer Problems - DTF and QuietExec

I'm going to be creating a trojan installer that serves as a health check
and deploying it daily to 2200 machines.  I'll be able to stress test the
fix made in 3.6 and see what happen.s

----------------------------------------

From: "Neil Sleightholm" <n...@x2systems.com>

Sent: Wednesday, January 25, 2012 1:06 PM

To: "General discussion for Windows Installer XML toolset." 
<wix-users@lists.sourceforge.net>, "chr...@iswix.com" <chr...@iswix.com>

Subject: RE: [WiX-users] Two Wierd Installer Problems - DTF and QuietExec


As Chris said excellent information. Mine problem was with 3.5 and this ties
in with what I was seeing; on my VMs running on an i7 host I never saw the
problem but the tester often got it on his lower powered host. He need move
to a VM on an ESX host and the problem largely went away. I think I will try
the newer SfxCA.dll (or I might just go for 3.6).


Thanks


Neil


-----Original Message-----

From: Blair [mailto:os...@live.com] 

Sent: 25 January 2012 18:14

To: 'General discussion for Windows Installer XML toolset.';
chr...@iswix.com

Subject: Re: [WiX-users] Two Wierd Installer Problems - DTF and QuietExec


Are these problems in 3.5 or 3.6? Last year I discovered a defect in DTF
wherein a race condition upon completion of a DTF custom action call would
cause a failure return to Windows Installer, even when the managed code
custom action itself returned success. That was fixed in 3.6, but the bug
remains in 3.5. The race condition is in the native wrapper code. It tends
to manifest only when there is a heavy load (either CPU or disk) in the
machine at the moment that the custom action is completing, and thus was
very difficult to reproduce (I was fortunate enough to have exactly one box
that reproduced it with any (but still uncertain) regularity, out of dozens
of other boxes that would never reproduce it).


You can take the SfxCA.dll files from recent builds of 3.6 and use them with
3.5's RTM build to get that race condition fix and an unrelated memory leak
fix. I don't remember the bug numbers, but I do remember the investigation
and fix of the race condition.


I don't know what would cause the QuietExec issue, however.


-Blair


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