Hi,
Summary:
SELinux prevented umount from mounting on the file or directory "mtab" (type "etc_t").
Raw Audit Messages
node=localhost.localdomain type=AVC msg=audit(1244693043.30:19491): avc: denied { unlink } for pid=10969 comm="umount" name="mtab" dev=dm-1 ino=87534 scontext=system_u:system_r:mount_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:etc_t:s0 tclass=file
node=localhost.localdomain type=SYSCALL msg=audit(1244693043.30:19491): arch=40000003 syscall=38 success=yes exit=0 a0=a1043b a1=a1040a a2=a12b88 a3=4 items=0 ppid=1886 pid=10969 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="umount" exe="/bin/umount" subj=system_u:system_r:mount_t:s0-s0:c0.c1023 key=(null)
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Rahul