Description of problem: su hangs for approx 20 sec when su-ing from nobody. no hang if pam_xauth.so is commented out of /etc/pam.d/su no hang if you su from any other user than nobody Version-Release number of selected component: pam-0.75-18.7 How reproducible: Always Steps to Reproduce: 1. update pam to pam-0.75-18.7 (the fix for RHBA-2001:149-14) 2. from a root login: 'su - nobody' 3. su - <a user> once the password is entered there is a 20 sec delay before the su command completes. strace on the 'su' shows : [snip] read(3, "root:x:0:0:root:/root:/bin/bash\n"..., 4096) = 4096 close(3) = 0 munmap(0x40022000, 4096) = 0 getgid32() = 99 getuid32() = 99 pipe([3, 4]) = 0 pipe([5, 6]) = 0 fork() = 24264 close(3) = 0 close(6) = 0 close(4) = 0 read(5, <20 seconds delay> "", 2048) = 0 --- SIGCHLD (Child exited) --- close(5) = 0 wait4(24264, NULL, 0, NULL) = 24264 fork() = 24265 rt_sigprocmask(SIG_BLOCK, ~[], NULL, 8) = 0 rt_sigaction(SIGTERM, {0x80498c0, [], 0x4000000}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [ALRM TERM], NULL, 8) = 0 wait4(-1,
[root@localhost root]#su - nobody This account is currently not available. Looks like there's no more possible to log in as nobody.