I am on 24.4 (installed via homebrew), on Yosemite, I have been seeing frequent crashes similar to that described by Sam:
Exception Type: EXC_BAD_ACCESS (SIGABRT)
Exception Codes: KERN_INVALID_ADDRESS at 0x000040dedeadbec0
Circumstance of my crashes: start Emacs (cocoa mode). Work for a while, opening some buffers. It can be hours to minutes before I get a crash.
I ran with NSZombieEnabled flag and got this
$ env NSZombieEnabled=YES /Applications/Emacs.app/Contents/MacOS/Emacs
2015-01-20 12:24:58.194 Emacs[26354:3200509] *** -[NSColorSpaceColor colorUsingDefaultColorSpace]: message sent to deallocated instance 0x11cb56cc0
Fatal error 5: Trace/BPT trapAbort trap: 6
Hope this is useful. I'm new here, if developers would prefer a fresh bug report, please let me know.
Evan Bender