Unexplained delay in accepting a TCP connection

Solution Verified - Updated -

Issue

  • When connecting to a rhel server i am seeing a 3 second delay that is causing production issues in my environment.

  • The accept function was being called out of the libcom.so.3.0.1 library instead of from libc.so.6. The libcom version appears to include a call to select to read from the just accepted socket with a 3 second timeout. An strace of the application shows

10011 17:35:38.313406 accept(3, {sa_family=AF_INET, sin_port=htons(12967), sin_addr=inet_addr("69.63.128.150")}, [16]) = 5 <0.000157>
10011 17:35:38.313807 select(6, [5], NULL, NULL, {3, 0}) = 0 (Timeout) <3.003258>

Environment

  • Red Hat Enterprise Linux 6

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