I built SKS 1.1.3 from source (not from apt-get source, downloaded direct from code.google.com) with BDB 5.3 (downloaded from oracle.com and compiled) and I got the same error with seven concurrent clients doing /pks/add and queries in a continuous loop.
I built SKS 1.1.3 against BDB 4.7 from sources and after 18 hours running, no mutex errors yet under same load.
I built SKS 1.1.3 from source (not from apt-get source, downloaded direct from code.google.com) with BDB 5.3 (downloaded from oracle.com and compiled) and I got the same error with seven concurrent clients doing /pks/add and queries in a continuous loop.
I built SKS 1.1.3 against BDB 4.7 from sources and after 18 hours running, no mutex errors yet under same load.