Starting udev hangs on boot when ldap logins are configured in RHEL?

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Issue

udev hangs on boot
When booting, the system hangs on "Starting udev" for several minutes before continuing.
It may also hang with message:
```
INIT: version 2.86 booting
```

Environment

Red Hat Enterprise Linux (RHEL) 4 and 5
ldap logins configured through PAM

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