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CFURLCreateDataAndPropertiesFromResource crash

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CFURLCreateDataAndPropertiesFromResource crash

Subject: CFURLCreateDataAndPropertiesFromResource crash
From: Mark Mieczkowski <email@hidden>
Date: Tue, 8 Feb 2005 12:57:52 -0500

I've been beating my head for a few weeks now trying to figure out how to stop CFURLCreateDataAndPropertiesFromResource from crashing. I'm calling it from a CFM plugin to a CFM application which was written in powerplant.

I get an access fault. Here's the call stack.

0 com.apple.CoreFoundation 0x90190f94 CFRetain + 0x20 1 com.apple.CFNetwork 0x91ace828 _CFNetConnectionGetState + 0x2c 2 com.apple.CFNetwork 0x91acf55c httpRequestRead + 0x7c 3 com.apple.CoreFoundation 0x901c38cc CFReadStreamRead + 0x180 4 com.apple.CFNetwork 0x91ae2de8 _CFHTTPMessageSendRequest + 0xd8 5 com.apple.CFNetwork 0x91ae394c _CFHTTPURLCreateDataAndPropertiesFromResource + 0xc4 6 com.apple.CFNetwork 0x91ae6898 _CFURLCreateDataAndPropertiesFromResource + 0xc0 7 com.apple.CoreFoundation 0x902239b0 __CFURLCreateDataAndPropertiesFromResource + 0x8c 8 com.apple.CoreFoundation 0x901c1524 CFURLCreateDataAndPropertiesFromResource + 0xc4

I am positive that all arguments to CFURLCreateDataAndPropertiesFromResource are valid and retained. I think that the autorelease pool may be getting releasing from another thread in the host application which causes the object returned from _CFNetConnectionGetState to get released.

here's the exact same call stack from a cocoa based host application

0 libobjc.A.dylib 0x908311f4 objc_msgSend + 0x14 1 com.apple.CFNetwork 0x9274b85c _CFNetConnectionResponseIsComplete + 0x28 2 com.apple.CFNetwork 0x9274b81c readFromConnection + 0x174 3 com.apple.CFNetwork 0x92742604 httpRequestRead + 0x124 4 com.apple.CoreFoundation 0x901c38cc CFReadStreamRead + 0x180 5 com.apple.CFNetwork 0x92755de8 _CFHTTPMessageSendRequest + 0xd8 6 com.apple.CFNetwork 0x9275694c _CFHTTPURLCreateDataAndPropertiesFromResource + 0xc4 7 com.apple.CFNetwork 0x92759898 _CFURLCreateDataAndPropertiesFromResource + 0xc0 8 com.apple.CoreFoundation 0x902239b0 __CFURLCreateDataAndPropertiesFromResource + 0x8c 9 com.apple.CoreFoundation 0x901c1524 CFURLCreateDataAndPropertiesFromResource + 0xc4

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