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Reply-To: jhg AT acm DOT org
Subject: Re: httpd immediate segfault on startup [solution]
References: <55B57A35 DOT 1070106 AT jhmg DOT net> <55BB9FD3 DOT 4090500 AT jhmg DOT net> <55BE58E6 DOT 2040801 AT gmail DOT com> <55BF0E48 DOT 7010207 AT jhmg DOT net>
To: cygwin AT cygwin DOT com
From: Jim Garrison <jhg AT jhmg DOT net>
Message-ID: <55DC8E60.4080602@jhmg.net>
Date: Tue, 25 Aug 2015 08:48:48 -0700
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For anybody else who's having trouble with apache segfaulting at
startup:

On 8/2/2015 11:46 PM, Jim Garrison wrote:
[snip]
>>>> Updated all cygwin packages to current versions, installed
>>>> httpd 2.4.16-1.  On startup httpd segfaults:
>>>> 
>>>> Exception: STATUS_ACCESS_VIOLATION at eip=65DC5D78 eax=8004E028
>>>> ebx=00000001 ecx=00000000 edx=8004DFF0 esi=80014490 
>>>> edi=80016498 ebp=0028CC78 esp=0028CB5C
>>>> program=C:\cygwin\usr\sbin\httpd.exe, pid 25500, thread main 
>>>> cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B Stack trace: 
>>>> Frame     Function  Args 0028CC78  65DC5D78 (00000003,
>>>> 0028CC9C, 80010100, 00000020) 0028CD28  6100846A (00000000,
>>>> 0028CD84, 610074F0, 00000000) End of stack trace
[snip]
> I think the exception and stack trace are secondary to the main 
> problem, which is described by the two messages in the error_log:
> 
> (88)Function not implemented: AH00023: Couldn't create the proxy
> mutex (88)Function not implemented: AH02478: failed to create proxy
> mutex
> 
> The exception goes away if I remove mod_perl from the configuration, 
> but the errors and failure to configure are the same.  I also tried 
> launching httpd in a mintty shell that was started with
> administrator privilege level, but the same error occurs.
> 
> The "Function not implemented" seems to indicate something
> mis-matched in my system but I cannot figure out what.

I just received this from Alex Kononov (thanks). I have not tried this
as I've moved in a different direction and no longer need to run apache
under Cygwin:

> I wasn't sure how to get on Cygwin mailing list quickly, so I'm
> writing to you directly.  I've had the same problem as you with the
> new release of Apache and I've just found a fix.  The issue is with
> the IPC (shared memory, semaphores, queues).  You must start an IPC
> server under windows (see, for starters, here --
> https://cygwin.com/cygwin-ug-net/using-cygserver.html).
> Unfortunately, the whole thing is not well documented.  Before, it
> was a part of the standard Cygwin installation, but now you must
> install cygrunsrv as a separate package.
> 
> Anyway, to fix "everything", just do: 1) Install cygrunsrv (this is
> done only once) 2) Run /usr/bin/cygserver-config (this is done only
> once) 3) Start Apache (/usr/sbin/apachectl ... options ...)
> 
> Alternatively, you may probably ask Apache not to use IPC mechanisms.
> I don't have time to try this, but feel free to explore.
> 
> Hope this helps.  Feel free to document these procedures on the
> Cygwin mailing list, so other people having the same problem will
> know what to do.
> 
> Good luck!
> 
> -- Alex


-- 
Jim Garrison (jhg AT acm DOT org)
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