MPD chashes with error in syslog:
snakeoil kernel: mpd[3770]: segfault at 0 ip 00007f5d8a0b84c3 sp 00007f5d813be578 error 4 in libavutil.so.52.3.0[7f5d8a0a8000+1e000]
Before that had problem in /var/tmp/syserror:
errno: Failed to register /media/music/nas/...: inotify_add_watch() has failed: No space left on device
But it was fixed by increasing max_user_watches.