cf_gen segfaults on FreeBSD-HEAD

Squid folks,

I am currently struggling with an odd issue with 2.6.STABLE16's cf_gen
that (unfortunately) keeps me (or rather the assigned FreeBSD committer)
from updating the FreeBSD port to 2.6.STABLE16. (In the meantime, we ship
STABLE15 plus all official changesets.)

The segfaults occur only on the HEAD FreeBSD branch (7-CURRENT). We
tried to see whether this is a compiler issue (FreeBSD 7 will ship with
gcc 4.2.1 as the system compiler while FreeBSD-6 uses 3.4.6) and found
that it probably is not: on FreeBSD 6, cf_gen works even when gcc 4.2.1
is used to compile Squid while on FreeBSD HEAD it always fails, even
when compiling Squid with gcc 3.4. (It might be a more subtle compiler
issue regarding system libraries nonetheless. I posted about this
problem a week ago on the FreeBSD-current development list but got no
reply so far.)

I see the same issues with 3.0.PRE7 when it is patched up to changeset
11081; the info I get from the core is almost identical.

Information from the core dump:

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"...
Core was generated by `cf_gen'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libm.so.5...done.
Loaded symbols for /lib/libm.so.5
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0 0x28152226 in strcmp () from /lib/libc.so.7
(gdb) bt
#0 0x28152226 in strcmp () from /lib/libc.so.7
#1 0x08048da6 in checkDepend (directive=0x282058c0 "external_acl_type",
    name=0xbfbfe11e "externalAclHelper", types=0x282025e0, entries=0x28207730)
    at cf_gen.c:133
#2 0x08049524 in main (argc=3, argv=0xbfbfe5d4) at cf_gen.c:284
(gdb) frame 2
#2 0x08049524 in main (argc=3, argv=0xbfbfe5d4) at cf_gen.c:284
284 checkDepend(curr->name, ptr, types, entries);
(gdb) p *curr
$1 = {name = 0x282058c0 "external_acl_type", alias = 0x0, type = 0x0,
  loc = 0x0, default_value = 0x0, default_if_none = 0x0, comment = 0x0,
  ifdef = 0x0, doc = 0x0, nocomment = 0x0, array_flag = 0, next = 0x0}
(gdb) p ptr
$2 = 0xbfbfe11e "externalAclHelper"
(gdb) p *types
$3 = {name = 0x282025f0 "errormap", depend = 0x0, next = 0x282025d0}
(gdb) p *entries
$4 = {name = 0x282069f0 "comment", alias = 0x0, type = 0x0,
  loc = 0x282069f8 "none", default_value = 0x0, default_if_none = 0x0,
  comment = 0x0, ifdef = 0x0, doc = 0x28206a00, nocomment = 0x0,
  array_flag = 0, next = 0x28207700}
(gdb) frame 1
#1 0x08048da6 in checkDepend (directive=0x282058c0 "external_acl_type",
    name=0xbfbfe11e "externalAclHelper", types=0x282025e0, entries=0x28207730)
    at cf_gen.c:133
133 if (strcmp(entry->name, dep->name) == 0)
(gdb) p *entry
$5 = {name = 0x282069f0 "comment", alias = 0x0, type = 0x0,
  loc = 0x282069f8 "none", default_value = 0x0, default_if_none = 0x0,
  comment = 0x0, ifdef = 0x0, doc = 0x28206a00, nocomment = 0x0,
  array_flag = 0, next = 0x28207700}
(gdb) p *dep
$6 = {name = 0x22a02270 <Address 0x22a02270 out of bounds>, next = 0x235022d0}
(gdb) quit

-- 
Best regards,
Thomas-Martin Seck (current FreeBSD Squid maintainer)