site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com The essence of my DADiskMountApprovalCallback is the following: I would be very grateful for any help on this matter. Thanks! -Jeff Johnson _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... I'm having trouble with my app crashing after my DADiskMountApprovalCallback gets called. In this case, the callback is the result of my app erasing a disk volume. The callback function successfully exits, so the crash is not happening in my app's code. Here's the backtrace: #0 0x90a55387 in objc_msgSend () #1 0x0d2358f0 in ?? () #2 0x9082205c in __CFDictionaryDeallocate () #3 0x9080b1a9 in _CFRelease () #4 0x913fc6f2 in _DADiskSetDescription () #5 0x913fc0cc in _DADispatchCallback () #6 0x913fbc3f in _DASessionCallback () #7 0x9083a3c5 in __CFMachPortPerform () #8 0x9082a66d in CFRunLoopRunSpecific () #9 0x90829b0e in CFRunLoopRunInMode () #10 0x92dc9bef in RunCurrentEventLoopInMode () #11 0x92dc92fd in ReceiveNextEventCommon () #12 0x92dc9154 in BlockUntilNextEventMatchingListInMode () #13 0x9326e465 in _DPSNextEvent () #14 0x9326e056 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] () #15 0x93267ddb in -[NSApplication run] () #16 0x9325bd2f in NSApplicationMain () #17 0x00002cde in main (argc=1, argv=0xbffff9dc) CFDictionaryRef description = DADiskCopyDescription(disk); if (description) { // Check kDADiskDescriptionVolumeNameKey and kDADiskDescriptionVolumeUUIDKey for relevant values. CFRelease(description); I suspect that ultimately the problem is connected to the fact that DADiskCopyDescription() does not necessarily create a new copy of the description but does a CFRetain(), as one can see in the file DADisc.c in the source code for DiskArbitration. I also wonder whether there is an issue with timeouts on the callbacks, because if I streamline the function by removing all code except the DADiskCopyDescription() and CFRelease(), the crash doesn't occur. With the non-streamlined function, I'm seeing log messages from disarbitrationd that my app is not responding. It doesn't appear that my code is over-releasing the description, because I checked that the retain count for the disk description is 2 immediately after DADiskCopyDescription(disk) and immediately before CFRelease(description). The retain count is 1 immediately before my function returns. If I comment out the CFRelease line, however, the crash does not occur, and for some reason the same volume triggers my callback three times. (Each time I return a DADissenterRef with the status kDAReturnNotPermitted.) This email sent to site_archiver@lists.apple.com