[karpet@freebsd80 ~/src/segfault-test/Foo]$ make test
PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/Foo....ok 1/1setenv TESTME complete with 0 at t/Foo.t line 11.             
t/Foo....dubious                                                             
	Test returned status 0 (wstat 139, 0x8b)
	after all the subtests completed successfully
Failed Test Stat Wstat Total Fail  List of Failed
-------------------------------------------------------------------------------
t/Foo.t        0   139     1    0  ??
Failed 1/1 test scripts. 0/1 subtests failed.
Files=1, Tests=1,  0 wallclock secs ( 0.05 cusr +  0.08 csys =  0.12 CPU)
Failed 1/1 test programs. 0/1 subtests failed.
*** Error code 255

Stop in /usr/home/karpet/src/segfault-test/Foo.

[karpet@freebsd80 ~/src/segfault-test/Foo]$ gdb /usr/local/bin/perl perl5.8.9.core 
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd"...

warning: core file may not match specified executable file.
Core was generated by `perl5.8.9'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/local/lib/perl5/5.8.9/mach/CORE/libperl.so...done.
Loaded symbols for /usr/local/lib/perl5/5.8.9/mach/CORE/libperl.so
Reading symbols from /lib/libm.so.5...done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /lib/libcrypt.so.5...done.
Loaded symbols for /lib/libcrypt.so.5
Reading symbols from /lib/libutil.so.8...done.
Loaded symbols for /lib/libutil.so.8
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /usr/home/karpet/src/segfault-test/Foo/blib/arch/auto/Foo/Foo.so...done.
Loaded symbols for /usr/home/karpet/src/segfault-test/Foo/blib/arch/auto/Foo/Foo.so
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x282b85fc in free () from /lib/libc.so.7
(gdb) bt
#0  0x282b85fc in free () from /lib/libc.so.7
#1  0x2832b5eb in strnlen () from /lib/libc.so.7
#2  0x28265b00 in ?? () from /lib/libc.so.7
#3  0x28343000 in ?? () from /lib/libc.so.7
#4  0x2807b358 in ?? () from /libexec/ld-elf.so.1
#5  0xbfbfe9f8 in ?? ()
#6  0x283355ac in ?? () from /lib/libc.so.7
#7  0x2808d100 in ?? ()
#8  0x2807b358 in ?? () from /libexec/ld-elf.so.1
#9  0xbfbfe9f8 in ?? ()
#10 0x2804ed25 in dlsym () from /libexec/ld-elf.so.1
Previous frame inner to this frame (corrupt stack?)
(gdb)