slapd not responding: FUTEX_WAIT

[Saket Sathe <saket@cc.iitb.ac.in>]

Hi All,
I am using OL 2.2.26 with BDB 4.5.2 + 4 patches.

Today morning I found out that on some of the slaves slapd is not 
responding.
Here is an strace of the irresponsive process:

# strace -p 2906
Process 2906 attached - interrupt to quit
futex(0xbd7c2bf8, FUTEX_WAIT, 2910, NULL

Please let me know any other relevant information I can provide 
pertaining to this error.
--
Saket