On Mon, 29 Feb 2016 11:53:19 +0000 Steve Kemp <st...@steve.org.uk>
wrote:
> Package: gawk
> Version: 1:4.1.1+dfsg-1
> Severity: important
> 
> Dear Maintainer,
> 
> The following wonderful program causes an immediate segfault in the
parse-process of gawk:
> 
>         for (i = ) in foo bar baz
> 

I did some AFL experiments and I found a shorter one:

  ()in a

awk -f out/crashes/id:000000,sig:06,src:000002,op:havoc,rep:2.min
awk: out/crashes/id:000000,sig:06,src:000002,op:havoc,rep:2.min:1: ()in a
awk: out/crashes/id:000000,sig:06,src:000002,op:havoc,rep:2.min:1:  ^ syntax 
error
awk: out/crashes/id:000000,sig:06,src:000002,op:havoc,rep:2.min:1: fatal error: 
internal error: segfault
fish: “awk -f out/crashes/id:000000,si…” terminated by signal SIGABRT (Abort)

Stefan

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