On 05/16/2013 07:08 AM, loic.blot wrote: > after tests and debug level increased to 5, i am sorry to say: nothing > found... When I suggested that you collect logs, I did not expect _you_ to analyze them. If they are not empty, others may be able to find what is wrong with your Squid (if anything). If you post logs, please indicate when the "infinite loop" started. BTW, does the "infinite loop" condition end on its own if you leave Squid running? Or do you have to kill Squid to make it work again? And no, Squid core is not multithreaded. There is a storage module that uses threads, but you are not using it. Squid also has SMP workers which are separate processes, but you are not using them either. HTH, Alex.