[Bug 264158] devel/pkconf: loop forever in Haskell package

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264158

            Bug ID: 264158
           Summary: devel/pkconf: loop forever in Haskell package
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: alexis.praga@free.fr
                CC: arrowd@FreeBSD.org

Hi,

I've discovered running `cabal install` for Haskell programmes takes a very
long time, for example `xmonad`.

With the help of @arrowd, here is a minimal reproducible example.

1. Run `make` in /usr/ports/devel/hs-ormolu
2. pkg-config takes a lot of CPU
  PID USERNAME    THR PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
19887 root          1  89    0    13M  3156K CPU0     0   0:09 100.23% pkgconf
3. Running the command by hand is fast but inside make, it seems to be stuck.
4. Enable debug flags of `pkgconf` and get a backtrace:

----
#0  0x00000008003c1985 in memset () from /lib/libc.so.7
#1  0x0000000800385822 in snprintf () from /lib/libc.so.7
#2  0x0000000800258455 in pkgconf_trace (client=0x20d488 <pkg_client>,
filename=0x8002537a9 "libpkgconf/pkg.c", lineno=1346, 
    funcname=0x800252fed "pkgconf_pkg_t
*pkgconf_pkg_verify_dependency(pkgconf_client_t *, pkgconf_dependency_t *,
unsigned int *)", format=0x8002543ff "trying to verify dependency: %s")
    at libpkgconf/client.c:379
#3  0x000000080025aa03 in pkgconf_pkg_verify_dependency (client=0x20d488
<pkg_client>, pkgdep=0x800a37f70, eflags=0x7ffffffe7174) at
libpkgconf/pkg.c:1346
#4  0x000000080025b24b in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a3b580, deplist=0x800a3b638, func=0x0, data=0x0, depth=1986,
skip_flags=0) at libpkgconf/pkg.c:1455
#5  0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a3b580, func=0x0, data=0x0, maxdepth=1986, skip_flags=0) at
libpkgconf/pkg.c:1581
#6  0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a6e180, deplist=0x800a6e238, func=0x0, data=0x0, depth=1987,
skip_flags=0) at libpkgconf/pkg.c:1481
#7  0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a6e180, func=0x0, data=0x0, maxdepth=1987, skip_flags=0) at
libpkgconf/pkg.c:1581
#8  0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a6e000, deplist=0x800a6e0b8, func=0x0, data=0x0, depth=1988,
skip_flags=0) at libpkgconf/pkg.c:1481
#9  0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a6e000, func=0x0, data=0x0, maxdepth=1988, skip_flags=0) at
libpkgconf/pkg.c:1581
#10 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a70280, deplist=0x800a70338, func=0x0, data=0x0, depth=1989,
skip_flags=0) at libpkgconf/pkg.c:1481
#11 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a70280, func=0x0, data=0x0, maxdepth=1989, skip_flags=0) at
libpkgconf/pkg.c:1581
#12 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a6f500, deplist=0x800a6f5b8, func=0x0, data=0x0, depth=1990,
skip_flags=0) at libpkgconf/pkg.c:1481
#13 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a6f500, func=0x0, data=0x0, maxdepth=1990, skip_flags=0) at
libpkgconf/pkg.c:1581
#14 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a89f00, deplist=0x800a89fb8, func=0x0, data=0x0, depth=1991,
skip_flags=0) at libpkgconf/pkg.c:1481
#15 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a89f00, func=0x0, data=0x0, maxdepth=1991, skip_flags=0) at
libpkgconf/pkg.c:1581
#16 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a89180, deplist=0x800a89238, func=0x0, data=0x0, depth=1992,
skip_flags=0) at libpkgconf/pkg.c:1481
#17 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a89180, func=0x0, data=0x0, maxdepth=1992, skip_flags=0) at
libpkgconf/pkg.c:1581
#18 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800aa6680, deplist=0x800aa6738, func=0x0, data=0x0, depth=1993,
skip_flags=0) at libpkgconf/pkg.c:1481
#19 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800aa6680, func=0x0, data=0x0, maxdepth=1993, skip_flags=0) at
libpkgconf/pkg.c:1581
#20 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800aa6380, deplist=0x800aa6438, func=0x0, data=0x0, depth=1994,
skip_flags=0) at libpkgconf/pkg.c:1481
#21 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800aa6380, func=0x0, data=0x0, maxdepth=1994, skip_flags=0) at
libpkgconf/pkg.c:1581
#22 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a70e80, deplist=0x800a70f38, func=0x0, data=0x0, depth=1995,
skip_flags=0) at libpkgconf/pkg.c:1481
#23 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a70e80, func=0x0, data=0x0, maxdepth=1995, skip_flags=0) at
libpkgconf/pkg.c:1581
#24 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800a70d00, deplist=0x800a70db8, func=0x0, data=0x0, depth=1996,
skip_flags=0) at libpkgconf/pkg.c:1481
#25 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800a70d00, func=0x0, data=0x0, maxdepth=1996, skip_flags=0) at
libpkgconf/pkg.c:1581
#26 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800ac9800, deplist=0x800ac98b8, func=0x0, data=0x0, depth=1997,
skip_flags=0) at libpkgconf/pkg.c:1481
#27 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800ac9800, func=0x0, data=0x0, maxdepth=1997, skip_flags=0) at
libpkgconf/pkg.c:1581
#28 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800aca400, deplist=0x800aca4b8, func=0x0, data=0x0, depth=1998,
skip_flags=0) at libpkgconf/pkg.c:1481
#29 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800aca400, func=0x0, data=0x0, maxdepth=1998, skip_flags=0) at
libpkgconf/pkg.c:1581
#30 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x800ac9380, deplist=0x800ac9438, func=0x0, data=0x0, depth=1999,
skip_flags=0) at libpkgconf/pkg.c:1481
#31 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x800ac9380, func=0x0, data=0x0, maxdepth=1999, skip_flags=0) at
libpkgconf/pkg.c:1581
#32 0x000000080025b345 in pkgconf_pkg_walk_list (client=0x20d488 <pkg_client>,
parent=0x7ffffffe7dd8, deplist=0x7ffffffe7e90, func=0x0, data=0x0, depth=2000,
skip_flags=0) at libpkgconf/pkg.c:1481
#33 0x000000080025ae30 in pkgconf_pkg_traverse (client=0x20d488 <pkg_client>,
root=0x7ffffffe7dd8, func=0x0, data=0x0, maxdepth=2000, skip_flags=0) at
libpkgconf/pkg.c:1581
#34 0x000000080025ac9e in pkgconf_pkg_verify_graph (client=0x20d488
<pkg_client>, root=0x7ffffffe7dd8, depth=2000) at libpkgconf/pkg.c:1399
#35 0x0000000800260b1c in pkgconf_queue_verify (client=0x20d488 <pkg_client>,
world=0x7ffffffe7dd8, list=0x7ffffffe8090, maxdepth=2000) at
libpkgconf/queue.c:116
#36 0x0000000800260bd6 in pkgconf_queue_validate (client=0x20d488 <pkg_client>,
list=0x7ffffffe8090, maxdepth=2000) at libpkgconf/queue.c:189
#37 0x0000000000206ea2 in main (argc=1147, argv=0x7fffffff8880) at
cli/main.c:1308
---

5. Continuing the execution and get a backtrace again result in the same thing.

My configuration:
- FreeBSD 13.0-RELEASE-p11
- ghc 8.10.7 and cabal-install 3.6.0.0 (from the ports tree)

Thanks !

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