On Tue, Sep 27, 2011 at 2:06 PM, Martin Wierschin <mar...@nisus.com> wrote: > I have a user reporting a crash whenever they try to first save a file. It is > reproducible for the user (though not be me) and I'm wondering how to best > debug this problem remotely. I've included the crash stack below (all other > threads are waiting/trapped).
Your stack includes the dlopen function. What that does is "manually" load a dynamic library, that is, code that either you are Apple's engineers wrote is loading a dynamic library by name at runtime, rather than being linked at build time and loaded by the system at application launch. The dtruss command will print out the system calls that your app makes - or that frameworks that your app links to call: http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man1/dtruss.1m.html http://humberto.digi.com.br/blog/2008/02/25/strace-on-mac-os-x-leopard/ Write a shell script to have your user run, that will launch your app under dtruss while saving its output to a text file, then ask your user to send you that text file. Search in it for "dlopen", and it should show you which shared library is being loaded. That library may be the executable withing a framework, or it may be a vanilla dylib in /usr/bin or some such. If it's not enough to just find out which dylib is causing the crash, it might be worthwhile to write your own "shim" dylib that is inserted in place of the real one somehow, that has all the same entry points but records all their parameters, then loads the real shared library and passes the call on. If you are careful about it you could have your user replace his original shared library with yours, while moving the original to some other name that your shim knows how to load. This would be a little dangerous; if the dylib is important and you screw up, your user might have to reinstall OS X, so make sure you get it right. -- Don Quixote de la Mancha quix...@dulcineatech.com Custom Software Development for the iPhone and Mac OS X http://www.dulcineatech.com/custom-software-development/ _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
