Segmentation fault in su

[Ahamed.MLA]

Hi,
  If i login as an ordinary user(admin), and try to switch to ROOT user, iam 
getting Segmentating fault, though iam member of  wheel group and given trust 
in /etc/pam.d/su 

  %PAM-1.0 ### /etc/pam.d/su -->
   auth       required     /lib/security/pam_wheel.so group=wheel

##### /etc/group -->
wheel:x:10:root,admin

I am using Redhat Linux- 7.2 in my servers. Kindly provide me a solution, as 
soon as possible.


Regards
Ahamed.MLA
Beacon Operations 24/7 
Sify Ltd.
Chennai
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