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Subject: bug#79494: Issue with posix_spawn_file_actions_addclosefrom_np on FreeBSD 13.1+ and 14+
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From: Nikolaos Chatzikonstantinou <nchatz314@HIDDEN>
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 Content preview:  Hello list, I would like to summarize an issue [1] that first
 came up on the FreeBSD bugzilla for Guile 3.0.10. It's a segfault due to
 the incorrect mixing of two separate APIs for Posix spawn. As Tobias Kortkamp
 clarifies there, the gnulib rpl_posix_spawn*() functions are picked up by
 Guile's autotools. However, posix_spawn_file_actions_addclosefrom_np() does
 not have a gnulib implementatio [...] 
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Hello list,

I would like to summarize an issue [1] that first came up on the
FreeBSD bugzilla for Guile 3.0.10. It's a segfault due to the
incorrect mixing of two separate APIs for Posix spawn.

As Tobias Kortkamp clarifies there, the gnulib rpl_posix_spawn*()
functions are picked up by Guile's autotools. However,
posix_spawn_file_actions_addclosefrom_np() does not have a gnulib
implementation. On the other hand, Guile's configure.ac detects the
function as available on FreeBSD 13 (because FreeBSD 13.1 implemented
it [2]). There is only one place where all of this matters,
libguile/posix.c, and I want to explain how.

AC_CHECK_FUNCS in configure.ac is processed by autoheader(1) which
sets up a macro HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSEFROM_NP when it
can successfully load a test program with that function. The macro is
renamed in libguile/posix.c to HAVE_ADDCLOSEFROM (for brevity
probably):

  #ifdef HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSEFROM_NP
  # define HAVE_ADDCLOSEFROM 1
  #endif

Then it is used in 2 places in that file:

a) A fallback function close_inherited_fds() is defined if
   posix_spawn_file_actions_addclosefrom_np() is missing.
b) Inside do_spawn, if posix_spawn_file_actions_addclosefrom_np()
   exists it is used, otherwise the fallback function is used.

It is at b) where the segfault occurs: gnulib has a "fallback" spawn
implementation that is incompatible with
posix_spawn_file_actions_addclosefrom_np but compatible with
close_inherited_fds(). Nevertheless, currently on FreeBSD 14, the
gnulib implementation is used with the native
posix_spawn_file_actions_addclosefrom_np() which causes a segfault.

Further discussion on the issue [3,4] and the PR that attempts to fix
some of it. [5] Ideally we want to use native functions on FreeBSD
instead of gnulib's. currently the patch in [5] is avoiding use of
posix_spawn_file_actions_addclosefrom_np() on any platform where
HAVE_POSIX_SPAWN is not defined.

1. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282534
2. https://cgit.freebsd.org/src/commit/?id=a18ddf775744f31a844fd01fbe90207f7c5e706d
3. https://logs.guix.gnu.org/guile/2025-09-22.log
4. https://logs.guix.gnu.org/guile/2025-09-23.log
5. https://codeberg.org/guile/guile/pulls/17

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Nikolaos Chatzikonstantinou <nchatz314@HIDDEN>
Subject: bug#79494: Acknowledgement (Issue with posix_spawn_file_actions_addclosefrom_np
 on FreeBSD 13.1+ and 14+)
Message-ID: <handler.79494.B.175859282719410.ack <at> debbugs.gnu.org>
References: <CAAQmekd82mA11-ob1BOOQZ8KLcHnNALEsKVXfsf4wLLPMJzxVQ@HIDDEN>
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Date: Tue, 23 Sep 2025 02:01:04 +0000

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 Content preview:  severity 79494 wishlist thanks 
 
 Content analysis details:   (1.3 points, 10.0 required)
 
  pts rule name              description
 ---- ---------------------- --------------------------------------------------
  0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends
                             in digit (nchatz314[at]gmail.com)
 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at https://www.dnswl.org/,
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severity 79494 wishlist
thanks

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