Hi,
so, signal 6 is SIGABRT, which is apparently sent by some component to Squid, causing it to terminate.
Your problem sounds related to this one, which I currently don’t know what it is caused by. In your case, I am suspecting SquidClamAV to be the root cause - does disabling it make a difference?
The ASNBL helper messages are normal and do not indicate a problem.
Thanks, and best regards,
Peter Müller