Hi that's a memory leak failure , reboot to clear it and get service back online
https://supportforums.cisco.com/document/22301/user-receives-sys-2-mallocfail-messages-due-memory-leak-or-fragmentation-issue
http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-151m-t/116467-technote-ios-00.html#anc1