gawk-3.1.3: internal error and coredump with f(nothing) called twice

[Michael Mauch]

Hi Arnold,

the test script:

#! /usr/local/bin/gawk -f

BEGIN {
  f(nothing)
  f(nothing)
}

function f(nothing)
{
  print nothing
}

# End.

prints an internal error and throws a core:

gawk: ./orderNCMd_dbg:5: fatal error: internal error

It works fine with gawk-3.1.2 and older versions. This is on Linux
(Gentoo and Debian), i386.

Backtrace:

(gdb) bt
#0  0x42dfcf61 in kill () from /lib/libc.so.6
#1  0x42dfcd05 in raise () from /lib/libc.so.6
#2  0x42dfe1fc in abort () from /lib/libc.so.6
#3  0x08066378 in catchsig (sig=0) at main.c:1021
#4  <signal handler called>
#5  push_args (count=1, argp=0x808cab8, oldstack=0x0, func_name=0x808d080 "f",
    varnames=0x808d0b0) at eval.c:1566
#6  0x08076d2c in func_call (tree=0x808caf8) at eval.c:1641
#7  0x080758d6 in r_tree_eval (tree=0x808caf8, iscond=0) at eval.c:884
#8  0x08075002 in interpret (tree=0x808caf8) at eval.c:787
#9  0x080742c2 in interpret (tree=0x808cb38) at eval.c:394
#10 0x08074225 in interpret (tree=0x808c9f8) at eval.c:373
#11 0x08064db8 in main (argc=3, argv=0xbffff074) at main.c:562

Of course the test script above is not the real script where I
experienced that problem, but it's the simplest version that triggered
this internal error.

Thank you for your great work!

Regards...
                Michael