Here's an even simpler script which causes the segfault. I also show
the backtrace in gdb. // Thomas
$ cat a
(IFS=)
function g { IFS= ; }
function f { typeset IFS ; (g) ; : $V ; }
f
$ ksh a
Segmentation fault
$ ksh --version
version sh (AT&T Research) 93u 2011-02-08
$ which ksh
/usr/bin/ksh
$ gdb /usr/bin/ksh
GNU gdb (Ubuntu/Linaro 7.3-0ubuntu2) 7.3-2011.08
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /usr/bin/ksh...done.
(gdb) run a
Starting program: /usr/bin/ksh a
Program received signal SIGSEGV, Segmentation fault.
0x0000000000782730 in ?? ()
(gdb) bt
#0 0x0000000000782730 in ?? ()
#1 0x00000000004395d7 in nv_getval (np=0x782600)
at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/name.c:2647
#2 0x0000000000435729 in sh_macexpand (shp=0x763de0, argp=0x7822c0,
arghead=0x7fffffffcb28,
flag=<optimized out>) at
/home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/macro.c:207
#3 0x0000000000476feb in arg_expand (flag=0, argchain=0x7fffffffcb28,
argp=0x7822c0, shp=0x763de0)
at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/args.c:871
#4 sh_argbuild (shp=0x763de0, nargs=0x7fffffffd074, comptr=<optimized
out>, flag=<optimized out>)
at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/args.c:728
#5 0x0000000000456672 in sh_exec (t=0x782280, flags=7)
at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/xec.c:916
#6 0x00000000004568e5 in sh_exec (t=0x782280, flags=7)
at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/xec.c:1973
#7 0x0000000000455e39 in sh_funscope (argn=<optimized out>,
argv=0x772190, fun=0, arg=0x7fffffffd910,
execflg=5) at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/xec.c:3222
#8 0x0000000000456230 in sh_funct (shp=0x763de0, np=0x76afb0, argn=1,
argv=0x772190, envlist=0x0,
execflg=5) at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/xec.c:3308
#9 0x000000000045b16b in sh_exec (t=0x772130, flags=5)
at /home/jdthood/tmp/ksh-93u/src/cmd/ksh93/sh/xec.c:1397
#10 0x0000000000408950 in exfile ()
#11 0x0000000000407d8f in sh_main ()
#12 0x00007ffff75d630d in __libc_start_main () from
/lib/x86_64-linux-gnu/libc.so.6
#13 0x0000000000406fe1 in _start ()
(gdb)
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