type=AVC msg=audit(1145551774.737:52508): avc: denied { write } for pid=32457 comm="umount" name="mtab" dev=dm-0 ino=17958918 scontext=system_u:system_r:mount_t:s0 tcontext=user_u:object_r:etc_t:s0 tclass=file Hmm, this may also explain why the automatically-mount-on-insert behaviour of my usb key went a bit.. strange yesterday. (Ie, it stopped working). /proc/mounts and /etc/mtab were out of sync.
Also a labeling problem. restorecon /etc/mtab. You might want to run restorecond. Latest policy should keep this up /etc/mtab the correct context.
Closing as these have been marked as modified, for a while. Feel free to reopen if not fixed