After around and hour I got a 38 GByte file full of the following entries:
2006:07:24-00:00:03 (none) squid[11687]: httpAccept: FD 16: accept failure: (22) Invalid argument
2006:07:24-00:00:03 (none) squid[11687]: comm_accept: FD 16: (22) Invalid argument
The system can't delete the file automatically, and so the system shuts down, because the partition is 100% full.
I reconfigured the proxy now, just to see if there was bug in the config.
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