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A comment in configure.in says:
> dnl For libpcap's that don't need the restart function called for
> dnl multiple lexer passes, allow them to turn it off here. This option
> dnl exists solely to address a very rude email from the maintainer
> dnl indicating that it shouldn't be called directly (and of course he
> dnl was wrong because this is still needed).
This indicates that you should not really call pcap_restart() directly,
so we use this --disable-pcap-restart.
This fixes segfault when the filter is invalid.
ref #4466
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