“iTunes syncing is broken, and Apple’s not doing a good job of fixing it,” Kirk McElhearn writes for Kirkville. “There are some problems that seem well-documents, such as duplicate purchased tracks causing sync issues, and others that are too vague to find a cause.”
“What seems to happen is that some users get ‘too many open files’ errors in system.log (you can view this in the Console app), which causes syncing to fail,” McElhearn writes. “There are two solutions to this problem. The easiest is just to restart your Mac. Quitting iTunes won’t solve this issue; the usbmuxd is part of the MobileDevice framework. Restarting your Mac will clear all these connections, however.”
“No matter what; you shouldn’t have to restart your Mac to get iTunes to work,” McElhearn writes. “It’s worth noting, however, that this isn’t a new issue; if you Google “too many open files iTunes,” you’ll see people reporting this problem as far back as 2012.”
Read more in the full article here.