[MS4W-Users] Mapcache crash apache restart issue

[Jeff McKenna]

Hello Varun,

Wow that is great to hear that you and your organization are heavily 
using MS4W (7 projects!); please be sure to contact me directly to help 
fund the development and maintenance of this great product that you 
heavily rely upon, so we can all keep easily sharing our geo information.

Regarding your error, it seems that I previously gave good instructions 
to debug this, on that previous thread.  The steps are well documented, 
and be sure to go through each step, especially as you (as I do as well) 
install it on other drives - for example, see Step#4 "Modify the 
mapcache.xml file" of 
http://ms4w.com/README_INSTALL.html#g-mapcache-apache-module which has 
several hardcoded paths that needs modifying.  It could also be a 
Windows permissions setting for your cache folder as well, but that 
isn't a common issue.

If you have any documentation additions as you travel down this path, 
please be sure to file a ticket in the MS4W issue tracker 
http://www.ms4w.com/trac/report/1

Of course I offer professional support if you or your organization need 
more assistance.

Thank you again for this news of your strong reliance on this great product.

-jeff


-- 
Jeff McKenna
MapServer Consulting and Training Services
http://www.gatewaygeomatics.com/


On 2016-07-07 3:40 PM, Varun Saraf via MS4W-Users wrote:
> Hello,
>
> This issue seems to be an exact replication of the following thread and
> the said solution of the case sensitive drive letter does not fix it for
> me.
>
> http://osgeo-org.1560.x6.nabble.com/MS4W-3-0-4-dev-MapCache-Crash-td4647812.html
>
> I have not tried installing this in the C:/ drive yet. Might give it a
> go if I cannot find anything else. Currently its on the D drive. Also, I
> am still posting the apache log here for reference just in case.
>
> [Thu Jul 07 14:20:59.994506 2016] [mpm_winnt:notice] [pid 2584:tid 500]
> AH00428: Parent: child process 3196 exited with status 255 -- Restarting.
> [Thu Jul 07 14:21:00.010107 2016] [mpm_winnt:notice] [pid 2584:tid 500]
> AH00455: Apache/2.4.20 (Win32) mod-mapcache/1.4.1 configured -- resuming
> normal operations
> [Thu Jul 07 14:21:00.010107 2016] [mpm_winnt:notice] [pid 2584:tid 500]
> AH00456: Server built: May  6 2016 16:47:33
> [Thu Jul 07 14:21:00.010107 2016] [core:notice] [pid 2584:tid 500]
> AH00094: Command line: 'D:\\ms4w\\Apache\\bin\\httpd.exe -d D:/ms4w/Apache'
> [Thu Jul 07 14:21:00.010107 2016] [mpm_winnt:notice] [pid 2584:tid 500]
> AH00418: Parent: Created child process 760
> [Thu Jul 07 14:21:00.244088 2016] [mpm_winnt:notice] [pid 760:tid 408]
> AH00354: Child: Starting 64 worker threads.
>
> The procedure I followed is to simply extract ms4w and update all paths
> to include the drive letter "D:/" instead of the plain "/ms4w" in the
> httpd.conf along with the un-commenting and setting alias for mapcache.
> I have over 7 projects using it and I keep seeing "lck" files being
> generated in the cache folder. There have been a few lock related logs
> as well. Not sure if its related.
>
> [Thu Jul 07 09:28:28.303441 2016] [:error] [pid 1596:tid 932] deleting a
> possibly stale lock after waiting on it for 120.01 seconds
>
> The system's event viewer also has an error each time mapcache
> crashes/Apache restarts itself.
>
> Faulting application name: httpd.exe, version: 2.4.20.0, time stamp:
> 0x572cf52d
> Faulting module name: mapcache.dll, version: 0.0.0.0, time stamp: 0x572d022c
> Exception code: 0xc0000005
> Fault offset: 0x0001b201
> Faulting process id: 0x3c8
> Faulting application start time: 0x01d1d8790cdd8d0f
> Faulting application path: D:\ms4w\Apache\bin\httpd.exe
> Faulting module path: D:\ms4w\Apache\cgi-bin\mapcache.dll
> Report Id: 4aadca27-446c-11e6-94a1-1228e002b1af
> Faulting package full name:
> Faulting package-relative application ID:
>
> Here is the OS and MS4W configuration:
>
> Windows 2012 standard 64 bit OS
> MS4W 3.1.4
>
> It would be great if someone can please help me in this regard.
>
> Thanks,
> Varun
>