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(ITS#6310) Slapd with pcache crashes under load

Full_Name: luben karavelov
Version: 2.4.18 - HEAD
OS: Debian Linux
Submission from: (NULL) (

I have 2 running slapd servers for load balancing. The 2 instances are
configured with back-sql and pcache overlay. Every 5-15 minutes one of the
servers crashes.

The config could be found here:

A gdb session with the resulting core dump could be found here:

Without proxycache overlay the servers does not crash in this manner.

The software tested is 
1. slapd 2.4.18 with backported pcache.c from HEAD
2. slapd HEAD

I could provide more info, just ask.

Thanks in advance for help