I cannot start V3.2.2. Squid seems to die in Ipc::StoreMap::openForReadingAt() -> Ipc::ReadWriteLock::lockShared() at start or first request. If I undo this change (from http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11649.patch): - Slot slots[]; ///< slots storage + Slot *slots; ///< slots storage it works again.... Without shared mem it works too. Thank you Daniel