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Re: [PATCH draft 0/6] Remove the fhandler_base_overlapped class


On 6/7/2019 3:13 PM, Ken Brown wrote:
> On 6/7/2019 2:31 PM, Achim Gratz wrote:
>> Ken Brown writes:
>>> I think I've found the problem.  I was mishandling signals that arrived during a
>>> read.  But after I fix that, there's still one nagging issue involving timerfd
>>> code.  I'll write to the main list with details.  I *think* it's a timerfd bug,
>>> but it's puzzling that I only see it when testing my new pipe implementation.
>>
>> Anything triggering a race or deadlock will depend on so many other
>> things that it really is no surprise to see seemingly unrelated changes
>> making the bug appear or disappear.  There are certainly races left in
>> Cygwin, I see them from time to time in various Perl modules, just never
>> reproducible enough to give anyone an idea of where to look.
> 
> That makes sense.
> 
> In the meantime, I've already discovered another problem, within an hour of
> posting my claim that everything was working fine: If I start emacs-X11 with
> cygserver running, I can't fork any subprocesses within emacs.  I get
> 
> 0 [main] emacs 2689 dofork: child 2693 - died waiting for dll loading, errno 11
> 
> Back to the drawing board....  I've never looked at the cygserver code, but
> maybe it will turn out to be something easy.

Good news (for me): This isn't related to my pipe code.  The same problem occurs 
if I build the master branch.  I'll bisect when I get a chance (probably 
tomorrow).  In the meantime, all I can say is that strace shows a 
STATUS_ACCESS_VIOLATION at shm.cc:125.

Ken

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