Received: (at 75658) by debbugs.gnu.org; 2 Apr 2025 14:29:20 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Apr 02 10:29:19 2025 Received: from localhost ([127.0.0.1]:58723 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tzz5g-0007rW-ML for submit <at> debbugs.gnu.org; Wed, 02 Apr 2025 10:29:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59068) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1tzz5U-0007qL-EL for 75658 <at> debbugs.gnu.org; Wed, 02 Apr 2025 10:29:11 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1tzz5L-0007C5-CQ; Wed, 02 Apr 2025 10:28:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:Date:References:In-Reply-To:Subject:To: From; bh=OpMFYdjotSjEFs7O435EGc20nn3bVqHNxx9ccWUMa9g=; b=FtgFMY5i4mg4PqCSbYkj rmzRULZM3fIwruHOlQxSLlLAmqzTukxTVdGFyumgv+5HSRvSiugl5GzZsDK7PxRpm/zu88W9c7XKu 7RJwHJtFtFHUbXNHqXnDYnxtEG2800CmWpzLFRZofW1fDQ3gtK7AzNqhXZ+Pkv2zW4woIAMlLLjuk prnj9vYRAUflpNTnh1PxY0NLVXrE+SAFEe1EHfabmvXFmCPiQ5N6XEzKF5b/0pEs6/NlJ/GEl7bUy TgZb+vyF+XCy8eNdcFEjeRN0dVVcYXxPY9VtOJ8NtS1tRYtb5wTpoI0DN2va65Gic4mD1DMoZEOZd EFV8J1lCg+zJrA==; From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> To: Janneke Nieuwenhuizen <janneke@HIDDEN> Subject: Re: bug#75658: [PATCH 0/4] Fixes for subshells and redirections In-Reply-To: <87zfh72bay.fsf@HIDDEN> (Janneke Nieuwenhuizen's message of "Thu, 27 Mar 2025 08:16:21 +0100") References: <20250319212033.4643-1-ludo@HIDDEN> <87zfh72bay.fsf@HIDDEN> Date: Wed, 02 Apr 2025 16:28:46 +0200 Message-ID: <87y0wibpsx.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 75658 Cc: Timothy Sample <samplet@HIDDEN>, gash-devel@HIDDEN, 75658 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hi there! Janneke Nieuwenhuizen <janneke@HIDDEN> skribis: > That's awesome, what a terrible puzzle that was! > > I'm hoping Timothy finds the time to review/merge/release Gash. We > could carry these patches in Guix, but yeah. Yup, it would be great if one of you could do that. :-) Especially since =E2=80=98core-packages-team=E2=80=99 has been queued for a= while now and the latest attempts to evaluate the branch have all failed due to this bug, as in <https://ci.guix.gnu.org/eval/2050457/log/raw> (I guess we were lucky on the previous =E2=80=98core-updates=E2=80=99 cycle, or just= retried until it would eventually work!). Cheers, Ludo=E2=80=99.
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From: Janneke Nieuwenhuizen <janneke@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: [PATCH 0/4] Fixes for subshells and redirections
In-Reply-To: <20250319212033.4643-1-ludo@HIDDEN> ("Ludovic =?utf-8?Q?Cour?=
=?utf-8?Q?t=C3=A8s=22's?= message
of "Wed, 19 Mar 2025 22:20:29 +0100")
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Ludovic Court=C3=A8s writes:
Hi!
> This fixes issues reported at <https://issues.guix.gnu.org/75658>
> and related I noticed while looking at the code.
>
> Feedback welcome!
That's awesome, what a terrible puzzle that was!
I'm hoping Timothy finds the time to review/merge/release Gash. We
could carry these patches in Guix, but yeah.
Greetings,
Janneke
--=20
Janneke Nieuwenhuizen <janneke@HIDDEN> | GNU LilyPond https://LilyPond.org
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bug-guix@HIDDEN:bug#75658; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: gash-devel@HIDDEN
Subject: Re: bug#75658: [PATCH 0/4] Fixes for subshells and redirections
In-Reply-To: <20250319212033.4643-1-ludo@HIDDEN> ("Ludovic =?utf-8?Q?Cour?=
=?utf-8?Q?t=C3=A8s=22's?= message
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References: <87msfnsrli.fsf@HIDDEN> <20250319212033.4643-1-ludo@HIDDEN>
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> shell: Exit child process when =E2=80=98execle=E2=80=99 fails.
> shell: Remove dead code in =E2=80=98install-current-ports!=E2=80=99.
> shell: =E2=80=98install-current-ports!=E2=80=99 opens file descriptors,=
not ports.
> Open low-numbered file descriptors for use by the shell.
For the record, I also built this series with Guile 2.0.9, by modifying
=E2=80=98guix.scm=E2=80=99 to refer to it instead of =E2=80=98guile-3.0=E2=
=80=99 and turning off tests
(since they require (srfi srfi-64), which 2.0.9 doesn=E2=80=99t have).
It appears to work fine and passes this test:
timeout 10m \
/gnu/store/3ylfablfwsdaapgk2y3x8yjchmapasxs-gash-0.3.0.6-f988cb-dirty/bin=
/gash -c 'exec 7>/dev/null; while true; do echo $(sh --version) > /dev/null=
; done'
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#75658; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Timothy Sample <samplet@HIDDEN>
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <87sencmzl8.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Sun, 16 Mar 2025 22:32:03 +0100")
References: <87msfnsrli.fsf@HIDDEN> <87wmeqpspy.fsf@HIDDEN>
<87bju7i6rr.fsf@HIDDEN> <871pv0wkfu.fsf@HIDDEN>
<87senex4m0.fsf@HIDDEN> <87wmcpnhol.fsf@HIDDEN>
<87sencmzl8.fsf@HIDDEN>
Date: Wed, 19 Mar 2025 22:27:15 +0100
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Hello Timothy,
Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> The hack below addresses that (mostly) by reserving low-number file
> descriptors before the signal and finalization threads create their
> pipe. (In practice, we can only reserve FDs above 5; FDs 3 and 4 are
> the =E2=80=9Csleep pipe=E2=80=9D I believe.)
I=E2=80=99ve just sent cleaned-up patches to gash-devel including this
fix/workaround.
It passes my tests, meaning that I cannot reproduce the original bug in
a timely fashion when running:
./pre-inst-env gash -c 'exec 2>/dev/null; while true; do echo $(sh --vers=
ion) > /dev/null; done'
or when running part of the GCC 4.9.4 =E2=80=98configure=E2=80=99 script in=
a loop
(attached is the helper script I used for that; not shown here is a
manual modification of said script so that it exits after =E2=80=9Cchecking=
for
a sed that does not truncate output=E2=80=9D, which was sufficient to repro=
duce
the bug, possibly after many iterations).
It would be great to cut a Gash release soonish as this bug has been
blocking the =E2=80=98core-packages-team=E2=80=99 branch for a while alread=
y.
Thanks,
Ludo=E2=80=99.
--=-=-=
Content-Type: text/plain
Content-Disposition: inline; filename=gash-redirect-EBADF-reproducer.sh
Content-Description: Helper script to reproduce the bug with GCC's configure script.
#!/bin/sh
set -x
export COLUMNS=200
#STRACE="strace -s 100 -f -o log.strace"
PATCH=--with-patch=gash=$PWD/gash-redirect-EBADF.patch
export SHELL=$(guix build gash $PATCH)/bin/gash
export CONFIG_SHELL=$SHELL
OPTIONS="--prefix=/wherever --disable-bootstrap --disable-decimal-float --disable-libatomic --disable-libcilkrts --disable-libgomp --disable-libitm --disable-libmudflap --disable-libquadmath --disable-libsanitizer --disable-libssp --disable-libvtv --disable-lto --disable-lto-plugin --disable-multilib --disable-plugin --disable-threads --enable-languages=c,c++ --enable-static --enable-shared --enable-threads=single --disable-libstdcxx-pch --disable-build-with-cxx"
cd /data/src/gcc-4.9.4
while $STRACE $SHELL -e ./configure $OPTIONS $OPTIONS $OPTIONS
do
grep fcntl.*EBADF log.strace && break
done
--=-=-=--
bug-guix@HIDDEN:bug#75658; Package guix.
Full text available.Received: (at 75658) by debbugs.gnu.org; 19 Mar 2025 21:20:54 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Mar 19 17:20:54 2025 Received: from localhost ([127.0.0.1]:53533 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tv0qM-0007ot-6G for submit <at> debbugs.gnu.org; Wed, 19 Mar 2025 17:20:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35264) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1tv0qJ-0007oY-Gg for 75658 <at> debbugs.gnu.org; Wed, 19 Mar 2025 17:20:52 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1tv0qD-0005fm-Q2; Wed, 19 Mar 2025 17:20:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:Date:Subject:To:From:in-reply-to: references; bh=IlV81GnsYVtkjCCD/omZzmZBkhGkpfypZtmp9adQqkc=; b=hscldkabC1aPzo y6zCucsNbLLZWscDiQn3FfP5LWIxm/rLZL1jd9LNLwuLlAx4JaqTus+hBDCZduHBhOKjUFiIH7ZYI iAqDGh865jig7WvdPvnACR0xLCIxmQ83Q1IYLs/qcwN5YyAB7H5a0h24fbX+AOKlD1a3w/8eW5eSA hozLiRZP8DzhzQxiueHZ/3Qpv+wQ+F5LatTJB8OsXa024A6viBKK/JXCTiy+7wdauCQlSYKYTDPN1 iL7s+1KV7MjuSU8+TSxyi2hpSMBwyJGrJLltFyrt7HkaHznrv0c2whZvzbyItaFXmr+fKTi2X4KlS cmA1XwvUOBfxNf/loakA==; From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN> To: gash-devel@HIDDEN Subject: [PATCH 0/4] Fixes for subshells and redirections Date: Wed, 19 Mar 2025 22:20:29 +0100 Message-ID: <20250319212033.4643-1-ludo@HIDDEN> X-Mailer: git-send-email 2.48.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 75658 Cc: Timothy Sample <samplet@HIDDEN>, =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN>, 75658 <at> debbugs.gnu.org, Jan Nieuwenhuizen <janneke@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hello, This fixes issues reported at <https://issues.guix.gnu.org/75658> and related I noticed while looking at the code. Feedback welcome! Thanks, Ludo'. Ludovic Courtès (4): shell: Exit child process when ‘execle’ fails. shell: Remove dead code in ‘install-current-ports!’. shell: ‘install-current-ports!’ opens file descriptors, not ports. Open low-numbered file descriptors for use by the shell. gash/shell.scm | 29 +++++++++++++++++++++-------- scripts/gash.in | 14 +++++++++++++- tests/exiting.org | 27 +++++++++++++++++++++++++++ 3 files changed, 61 insertions(+), 9 deletions(-) base-commit: ec9f0313190e380687da387b4207469a0a0a8cd8 -- 2.48.1
bug-guix@HIDDEN:bug#75658; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Timothy Sample <samplet@HIDDEN>
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <87wmcpnhol.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Sun, 16 Mar 2025 16:01:14 +0100")
References: <87msfnsrli.fsf@HIDDEN> <87wmeqpspy.fsf@HIDDEN>
<87bju7i6rr.fsf@HIDDEN> <871pv0wkfu.fsf@HIDDEN>
<87senex4m0.fsf@HIDDEN> <87wmcpnhol.fsf@HIDDEN>
Date: Sun, 16 Mar 2025 22:32:03 +0100
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--=-=-=
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> But this illustrates another problem: in the child process, right before
> =E2=80=98execve=E2=80=99, the finalization thread may be restarted, in wh=
ich case it
> creates a new pipe.
>
> In the example below, the finalization pipe is on FDs 9 and 7, but
> =E2=80=98install-current-ports!=E2=80=99 blindly dups to FD 7, thereby cl=
osing one end
> of the finalization pipe that was just created:
The hack below addresses that (mostly) by reserving low-number file
descriptors before the signal and finalization threads create their
pipe. (In practice, we can only reserve FDs above 5; FDs 3 and 4 are
the =E2=80=9Csleep pipe=E2=80=9D I believe.)
It seems to be good enough though.
Thoughts?
Ludo=E2=80=99.
--=-=-=
Content-Type: text/x-patch
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diff --git a/gash/shell.scm b/gash/shell.scm
index 3611067..68e74e7 100644
--- a/gash/shell.scm
+++ b/gash/shell.scm
@@ -68,14 +68,13 @@ not a @code{file-port?}, its corresponding file descriptor will refer
to @file{/dev/null}."
;; XXX: Input/output ports? Closing other FDs?
(for-each (lambda (i)
- (match ((fd->current-port i))
- ((? file-port? port)
- (dup port i))
- ((? input-port? port)
- (dup (open-file "/dev/null" "r") i))
- ((? output-port? port)
- (dup (open-file "/dev/null" "w") i))
- (_ #t)))
+ (gc)
+ (let ((current-port (fd->current-port i)))
+ (match (current-port)
+ ((? file-port? port)
+ (let ((new (dup port i)))
+ (redirect-port port new)))
+ (#f #t))))
(iota *fd-count*)))
(define (exec-utility bindings path name args)
@@ -89,8 +88,14 @@ to @file{/dev/null}."
;; the buffer) produces its output.
(flush-all-ports)
(match (primitive-fork)
- (0 (install-current-ports!)
- (apply execle path utility-env name args))
+ (0
+ (dynamic-wind
+ (lambda ()
+ (install-current-ports!))
+ (lambda ()
+ (apply execle path utility-env name args))
+ (lambda ()
+ (primitive-exit 127))))
(pid (match-let (((pid . status) (waitpid pid)))
(set-status! (status:exit-val status)))))))
@@ -182,7 +187,10 @@ if it is our responsibility to close the port."
(define* (make-processed-redir fd target #:optional (open-flags 0))
(let ((port (match target
((? port?) target)
- ((? string?) (open target open-flags))
+ ((? string?)
+ (let ((port (open target open-flags)))
+ (set-port-revealed! port 10)
+ port))
;; TODO: Verify open-flags.
((? integer?) ((fd->current-port target)))
(#f #f))))
@@ -213,6 +221,7 @@ if it is our responsibility to close the port."
(make-processed-redir fd #f))
(('<< (? integer? fd) text)
(let ((port (tmpfile)))
+ (set-port-revealed! port 10)
(display text port)
(seek port 0 SEEK_SET)
(make-processed-redir fd port)))))
@@ -264,6 +273,7 @@ process."
(lambda () #t)
(lambda ()
(restore-signals)
+ (gc)
(set-atexit! #f)
;; We need to preserve the status given to 'exit', so we
;; catch the 'quit' key here.
diff --git a/scripts/gash.in b/scripts/gash.in
index f851c1d..57506ba 100644
--- a/scripts/gash.in
+++ b/scripts/gash.in
@@ -21,5 +21,13 @@
;;; along with Gash. If not, see <http://www.gnu.org/licenses/>.
(define (main args)
+ ;; Reserve file descriptors 5 to 12 (roughly) before the signal and
+ ;; finalization threads grab them so that a script willing to use
+ ;; them can do so without breaking Guile.
+ (let loop ((i 3))
+ (when (<= i 10)
+ (open-fdes "/dev/null" (logior O_RDONLY O_CLOEXEC))
+ (loop (+ i 1))))
+
(setenv "SHELL" ((compose canonicalize-path car command-line)))
- ((@ (gash gash) main) (command-line)))
+ ((module-ref (resolve-interface '(gash gash)) 'main) (command-line)))
--=-=-=--
bug-guix@HIDDEN:bug#75658; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Timothy Sample <samplet@HIDDEN>
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <87senex4m0.fsf@HIDDEN> (Timothy Sample's message of "Fri, 14
Mar 2025 23:08:55 -0600")
References: <87msfnsrli.fsf@HIDDEN> <87wmeqpspy.fsf@HIDDEN>
<87bju7i6rr.fsf@HIDDEN> <871pv0wkfu.fsf@HIDDEN>
<87senex4m0.fsf@HIDDEN>
Date: Sun, 16 Mar 2025 16:01:14 +0100
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Hello Timothy,
Thanks for chiming in.
Timothy Sample <samplet@HIDDEN> skribis:
> And here=E2=80=99s a reproducer:
>
> (let loop ()
> (define fd #f)
> (let ((P (open-input-file "/dev/null")))
> ;; Does not change the revealed count of P.
> (set! fd (fileno P)))
> (let ((port (open-input-file "/dev/null")))
> (dup->port port "r" fd)
> (close-port port)
> (loop)))
>
> This results in EBADF in seemingly exactly the same way. (I had to run
> it a few times: sometimes it runs out of file descriptors first.) This
> happens on bootstrap Guile (2.0.9) and modern Guile.
Nice reproducer; I fully agree with your analysis.
See3in that =E2=80=98install-current-ports!=E2=80=99 creates temporary port=
s (via =E2=80=98dup=E2=80=99)
for no reason since nobody captures their reference and they get GC=E2=80=
=99d
soon after, I rewrote it like this:
--8<---------------cut here---------------start------------->8---
(define (install-current-ports!)
"Install all current ports into their usual file descriptors. For
example, if @code{current-input-port} is a @code{file-port?}, make the
process file descriptor 0 refer to the file open for
@code{current-input-port}. If any current port is a @code{port?} but
not a @code{file-port?}, its corresponding file descriptor will refer
to @file{/dev/null}."
;; XXX: Input/output ports? Closing other FDs?
(for-each (lambda (i)
(gc) ;to trigger bugs
(let ((current-port (fd->current-port i)))
(match (current-port)
((? file-port? port)
(dup->fdes port i))
(#f #t))))
(iota *fd-count*)))
--8<---------------cut here---------------end--------------->8---
But this illustrates another problem: in the child process, right before
=E2=80=98execve=E2=80=99, the finalization thread may be restarted, in whic=
h case it
creates a new pipe.
In the example below, the finalization pipe is on FDs 9 and 7, but
=E2=80=98install-current-ports!=E2=80=99 blindly dups to FD 7, thereby clos=
ing one end
of the finalization pipe that was just created:
--8<---------------cut here---------------start------------->8---
23647 pipe2([7, 9], O_CLOEXEC) =3D 0
23647 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) =3D 0
23647 clone3({flags=3DCLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THR=
EAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, ch=
ild_tid=3D0x7f84204b3990, parent_tid=3D0x7f84204b3990, exit_signal=3D0, sta=
ck=3D0x7f841fb24000, stack_size=3D0x98ef80, tls=3D0x7f84204b36c0} =3D> {par=
ent_tid=3D[23648]}, 88) =3D 23648
[=E2=80=A6]
23647 write(9, "\0", 1) =3D 1
23648 <... read resumed>"\0", 1) =3D 1
23648 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) =3D 0
23648 read(7, <unfinished ...>
23647 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {tv_sec=3D0, tv_nsec=3D358458=
39}) =3D 0
23647 dup2(12, 7) =3D 7
23647 fcntl(7, F_GETFL) =3D 0x8002 (flags O_RDWR|O_LARGEFIL=
E)
23647 lseek(7, 0, SEEK_CUR) =3D -1 ESPIPE (Illegal seek)
23647 dup2(12, 7) =3D 7
23647 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {tv_sec=3D0, tv_nsec=3D358993=
20}) =3D 0
23647 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) =3D 0
23647 madvise(0x7f842207c000, 12288, MADV_DONTNEED) =3D 0
23647 write(9, "\0", 1) =3D 1
23648 <... read resumed>"\0", 1) =3D 1
23648 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) =3D 0
23648 read(7, <unfinished ...>
23647 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {tv_sec=3D0, tv_nsec=3D395398=
30}) =3D 0
23647 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {tv_sec=3D0, tv_nsec=3D395559=
97}) =3D 0
23647 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) =3D 0
23647 madvise(0x7f842207c000, 12288, MADV_DONTNEED) =3D 0
23647 madvise(0x7f8421d74000, 8192, MADV_DONTNEED) =3D 0
23647 write(9, "\0", 1) =3D -1 EPIPE (Broken pipe)
23647 --- SIGPIPE {si_signo=3DSIGPIPE, si_code=3DSI_USER, si_pid=3D23647, s=
i_uid=3D1000} ---
--8<---------------cut here---------------end--------------->8---
After that dup2(12, 7) call, writing to the finalization pipe yields
SIGPIPE, which terminates the process (here it corresponds to a subshell
running =E2=80=98expr=E2=80=99).
Since we=E2=80=99re going to exec right after fork, we could turn off
finalization around =E2=80=98primitive-fork=E2=80=99 such that the child do=
esn=E2=80=99t attempt
to restart the finalization thread before exec. The Shepherd has code
like this:
--8<---------------cut here---------------start------------->8---
(define %set-automatic-finalization-enabled?!
;; When using a statically-linked Guile, for instance in the initrd, we
;; cannot resolve this symbol, but most of the time we don't need it
;; anyway. Thus, delay it.
(let ((proc (delay
(pointer->procedure int
(dynamic-func
"scm_set_automatic_finalization_enable=
d"
(dynamic-link))
(list int)))))
(lambda (enabled?)
"Switch on or off automatic finalization in a separate thread.
Turning finalization off shuts down the finalization thread as a side effec=
t."
(->bool ((force proc) (if enabled? 1 0))))))
(define-syntax-rule (without-automatic-finalization exp ...)
"Turn off automatic finalization within the dynamic extent of EXP."
(let ((enabled? #t))
(dynamic-wind
(lambda ()
(set! enabled? (%set-automatic-finalization-enabled?! #f)))
(lambda ()
exp ...)
(lambda ()
(%set-automatic-finalization-enabled?! enabled?)))))
--8<---------------cut here---------------end--------------->8---
Problem is, we cannot use the FFI on the statically-linked Guile.
We could implement fork+exec in C, but we don=E2=80=99t have a C compiler at
this early bootstrap stage.
Thoughts?
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#75658; Package guix.
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From: Timothy Sample <samplet@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <871pv0wkfu.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Fri, 14 Mar 2025 01:00:05 +0100")
References: <87msfnsrli.fsf@HIDDEN> <87wmeqpspy.fsf@HIDDEN>
<87bju7i6rr.fsf@HIDDEN> <871pv0wkfu.fsf@HIDDEN>
Date: Fri, 14 Mar 2025 23:08:55 -0600
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
> I was able to capture an strace log of this:
>
> 15837 clone(child_stack=3DNULL, flags=3DCLONE_CHILD_CLEARTID|CLONE_CHILD_=
SETTID|SIGCHLD, child_tidptr=3D0x7fb10dad7850) =3D 15838
> 15838 set_robust_list(0x7fb10dad7860, 24) =3D 0
> 15837 wait4(15838, <unfinished ...>
> 15838 close(3) =3D 0
> 15838 close(4) =3D 0
> 15838 pipe2([3, 4], O_CLOEXEC) =3D 0
> [...]
> 15838 clone3({flags=3DCLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_T=
HREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, =
child_tid=3D0x7fb10beaa990, parent_tid=3D0x7fb10beaa990, exit_signal=3D0, s=
tack=3D0x7fb10b51b000, stack_size=3D0x98ef80, tls=3D0x7fb10beaa6c0} =3D> {p=
arent_tid=3D[15839]}, 88) =3D 15839
> 15839 rseq(0x7fb10beaafe0, 0x20, 0, 0x53053053 <unfinished ...>
> 15838 rt_sigprocmask(SIG_SETMASK, [], <unfinished ...>
> [...]
> 15838 lseek(2, 0, SEEK_CUR) =3D -1 ESPIPE (Illegal seek)
> 15839 close(10) =3D 0
> 15839 close(17 <unfinished ...>
> 15838 dup2(22, 6 <unfinished ...>
> 15839 <... close resumed>) =3D 0
> 15838 <... dup2 resumed>) =3D 6
> 15839 close(6 <unfinished ...>
> 15838 fcntl(6, F_GETFL <unfinished ...>
> 15839 <... close resumed>) =3D 0
> 15838 <... fcntl resumed>) =3D -1 EBADF (Bad file descriptor)
> 15839 close(7) =3D 0
> 15839 close(18) =3D 0
> 15839 close(15) =3D 0
> 15839 close(12) =3D 0
> 15839 close(9) =3D 0
> 15839 close(16) =3D 0
> 15838 write(2, "Backtrace:\n", 11) =3D 11
>
> The sequence goes like this:
>
> 1. A child process (15837) corresponding to the subshell is created;
>
> 2. That process creates a finalization thread (15839);
>
> 3. Main thread does dup2(22, 6); finalization does close(6); main
> thread does fcntl(6, F_GETFL), which fails with EBADF.
>
> I suspect something like a wrong revealed count on the relevant ports,
> possibly those created in =E2=80=98install-current-ports!=E2=80=99.
In =E2=80=9Cboot-9.scm=E2=80=9D, we have
(define dup->port
(case-lambda
((port/fd mode)
(fdopen (dup->fdes port/fd) mode))
((port/fd mode new-fd)
(let ((port (fdopen (dup->fdes port/fd new-fd) mode)))
(set-port-revealed! port 1)
port))))
It looks like the system calls on the main thread correspond to this
code (which is called from =E2=80=98install-current-ports!=E2=80=99 via =E2=
=80=98dup=E2=80=99).
Specifically, =E2=80=98dup2=E2=80=99 is called from =E2=80=98dup->fdes=E2=
=80=99 and =E2=80=98fcntl=E2=80=99 is called
from =E2=80=98fdopen=E2=80=99.
The way that =E2=80=98dup->fdes=E2=80=99 works is that it first makes sure =
that no
existing port has the desired file descriptor (=E2=80=98scm_evict_ports=E2=
=80=99), and
then calls =E2=80=98dup2=E2=80=98. This should mean that the requested fil=
e descriptor
is up for grabs.
Here=E2=80=99s my guess as to what=E2=80=98s happening. For brevity let=E2=
=80=99s call the port
with file descriptor 6 =E2=80=9CP=E2=80=9D.
1. The GC runs, nullifying the entry for P in the port table (weak key
hash table), and queuing its finalizer.
2. The evict ports loop runs, missing P because it was nullified (see
=E2=80=98scm_internal_hash_fold=E2=80=99).
3. =E2=80=98dup2=E2=80=99 turns 22 to 6.
4. The finalizer for P runs, closing 6.
5. =E2=80=98fdopen=E2=80=99 calls =E2=80=98fcntl=E2=80=99 on 6, which res=
ults in EBADF.
And here=E2=80=99s a reproducer:
(let loop ()
(define fd #f)
(let ((P (open-input-file "/dev/null")))
;; Does not change the revealed count of P.
(set! fd (fileno P)))
(let ((port (open-input-file "/dev/null")))
(dup->port port "r" fd)
(close-port port)
(loop)))
This results in EBADF in seemingly exactly the same way. (I had to run
it a few times: sometimes it runs out of file descriptors first.) This
happens on bootstrap Guile (2.0.9) and modern Guile.
That=E2=80=99s all I have for now. I=E2=80=99m not sure how to avoid this =
without
resorting to calling =E2=80=9C(gc)=E2=80=9D to synchronously run the finali=
zers before
trying to mess with the file descriptors.
-- Tim
bug-guix@HIDDEN:bug#75658; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: 75658 <at> debbugs.gnu.org
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <87bju7i6rr.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Tue, 11 Mar 2025 22:42:16 +0100")
References: <87msfnsrli.fsf@HIDDEN> <87wmeqpspy.fsf@HIDDEN>
<87bju7i6rr.fsf@HIDDEN>
Date: Fri, 14 Mar 2025 01:00:05 +0100
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> In gash/shell.scm:
> 289: 9 [sh:substitute-command #<procedure 2da0f560 at gash/eval.scm:129:=
35 ()>]
> 270: 8 [%subshell #<procedure v ()>]
> In ice-9/boot-9.scm:
> 157: 7 [catch quit #<procedure v ()> ...]
> In ice-9/r4rs.scm:
> 176: 6 [with-output-to-port #<variable 2de5dc00 value: #<output: file /d=
ev/pts/19>> ...]
> In srfi/srfi-1.scm:
> 619: 5 [for-each #<procedure eval-sh (exp)> ((<sh-exec> "expr" # ":" ...=
))]
> In gash/shell.scm:
> 129: 4 [sh:exec-let () "expr" ...]
> 92: 3 [exec-utility () ...]
> In srfi/srfi-1.scm:
> 616: 2 [for-each #<procedure 2d60f0a0 at gash/shell.scm:70:12 (i)> (0 1 =
2 ...)]
> In ice-9/boot-9.scm:
> 1473: 1 [dup->port #<input: file /dev/pts/19> "r0" 7]
> In unknown file:
> ?: 0 [fdopen 7 "r0"]
>
> ERROR: In procedure fdopen:
> ERROR: In procedure scm_fdes_to_port: Bad file descriptor
I was able to capture an strace log of this:
--8<---------------cut here---------------start------------->8---
15837 clone(child_stack=3DNULL, flags=3DCLONE_CHILD_CLEARTID|CLONE_CHILD_SE=
TTID|SIGCHLD, child_tidptr=3D0x7fb10dad7850) =3D 15838
15838 set_robust_list(0x7fb10dad7860, 24) =3D 0
15837 wait4(15838, <unfinished ...>
15838 close(3) =3D 0
15838 close(4) =3D 0
15838 pipe2([3, 4], O_CLOEXEC) =3D 0
[...]
15838 clone3({flags=3DCLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THR=
EAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, ch=
ild_tid=3D0x7fb10beaa990, parent_tid=3D0x7fb10beaa990, exit_signal=3D0, sta=
ck=3D0x7fb10b51b000, stack_size=3D0x98ef80, tls=3D0x7fb10beaa6c0} =3D> {par=
ent_tid=3D[15839]}, 88) =3D 15839
15839 rseq(0x7fb10beaafe0, 0x20, 0, 0x53053053 <unfinished ...>
15838 rt_sigprocmask(SIG_SETMASK, [], <unfinished ...>
[...]
15838 lseek(2, 0, SEEK_CUR) =3D -1 ESPIPE (Illegal seek)
15839 close(10) =3D 0
15839 close(17 <unfinished ...>
15838 dup2(22, 6 <unfinished ...>
15839 <... close resumed>) =3D 0
15838 <... dup2 resumed>) =3D 6
15839 close(6 <unfinished ...>
15838 fcntl(6, F_GETFL <unfinished ...>
15839 <... close resumed>) =3D 0
15838 <... fcntl resumed>) =3D -1 EBADF (Bad file descriptor)
15839 close(7) =3D 0
15839 close(18) =3D 0
15839 close(15) =3D 0
15839 close(12) =3D 0
15839 close(9) =3D 0
15839 close(16) =3D 0
15838 write(2, "Backtrace:\n", 11) =3D 11
--8<---------------cut here---------------end--------------->8---
The sequence goes like this:
1. A child process (15837) corresponding to the subshell is created;
2. That process creates a finalization thread (15839);
3. Main thread does dup2(22, 6); finalization does close(6); main
thread does fcntl(6, F_GETFL), which fails with EBADF.
I suspect something like a wrong revealed count on the relevant ports,
possibly those created in =E2=80=98install-current-ports!=E2=80=99.
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#75658; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: 75658 <at> debbugs.gnu.org
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <87wmeqpspy.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Sun, 19 Jan 2025 19:24:25 +0100")
References: <87msfnsrli.fsf@HIDDEN> <87wmeqpspy.fsf@HIDDEN>
Date: Tue, 11 Mar 2025 22:42:16 +0100
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> Ludovic Court=C3=A8s <ludovic.courtes@HIDDEN> skribis:
>
>> I stumbled upon this interesting non-deterministic failure while
>> building =E2=80=98gcc-mesboot-4.9.4.drv=E2=80=99 on current =E2=80=98cor=
e-packages-team=E2=80=99 (which
>> is unchanged compared to =E2=80=98master=E2=80=99):
>
> Just got another one:
A few more, obtained by running the start of the =E2=80=98configure=E2=80=
=99 script in a
loop (added an =E2=80=98exit=E2=80=99 on line 2562, which is after the firs=
t 4 lines of
output).
while ./configure CONFIG_SHELL=3D/gnu/store/98bd49rhyia49y0b9d7sk8phsq14g=
3nk-gash-boot-0.3.0/bin/bash SHELL=3D/gnu/store/98bd49rhyia49y0b9d7sk8phsq1=
4g3nk-gash-boot-0.3.0/bin/bash --prefix=3D/gnu/store/awkbdj5j41pv5kiy9ifs0z=
l40jamwfw4-gcc-mesboot-4.9.4 --enable-fast-install --build=3Dx86_64-unknown=
-linux-gnu --prefix=3D/gnu/store/awkbdj5j41pv5kiy9ifs0zl40jamwfw4-gcc-mesbo=
ot-4.9.4 --build=3Di686-unknown-linux-gnu --host=3Di686-unknown-linux-gnu -=
-with-host-libstdcxx=3D-lsupc++ --with-native-system-header-dir=3D/gnu/stor=
e/gc91zbacrk6prhvm91cj3x9rr3v2k17q-glibc-mesboot-2.16.0/include --with-buil=
d-sysroot=3D/gnu/store/gc91zbacrk6prhvm91cj3x9rr3v2k17q-glibc-mesboot-2.16.=
0/include --disable-bootstrap --disable-decimal-float --disable-libatomic -=
-disable-libcilkrts --disable-libgomp --disable-libitm --disable-libmudflap=
--disable-libquadmath --disable-libsanitizer --disable-libssp --disable-li=
bvtv --disable-lto --disable-lto-plugin --disable-multilib --disable-plugin=
--disable-threads --enable-languages=3Dc,c++ --enable-static --enable-shar=
ed --enable-threads=3Dsingle --disable-libstdcxx-pch --disable-build-with-c=
xx ; do : ;done
--8<---------------cut here---------------start------------->8---
warning: failed to install locale: Invalid argument
Backtrace:
In gash/environment.scm:
371: 19 [call-with-break #<procedure 2dda9450 at gash/shell.scm:400:6 ()>]
In srfi/srfi-1.scm:
619: 18 [for-each #<procedure 2dda9420 at gash/shell.scm:401:18 (value)> #]
In gash/environment.scm:
353: 17 [call-with-continue #<procedure 2de13460 at gash/eval.scm:158:14 (=
)>]
In srfi/srfi-1.scm:
616: 16 [for-each #<procedure eval-sh (exp)> (# # #)]
619: 15 [for-each #<procedure eval-sh (exp)> ((<sh-set!> ("ac_optarg" #)))]
In gash/eval.scm:
221: 14 [eval-sh (<sh-set!> ("ac_optarg" (<sh-cmd-sub> #)))]
In srfi/srfi-1.scm:
642: 13 [for-each #<procedure 2da0f5e0 at gash/eval.scm:221:17 (name word)=
> # #]
In gash/eval.scm:
222: 12 [#<procedure 2da0f5e0 at gash/eval.scm:221:17 (name word)> "ac_opt=
arg" #]
131: 11 [eval-word (<sh-cmd-sub> (<sh-exec> "expr" # ":" ...)) #:output st=
ring ...]
121: 10 [expand-word (<sh-cmd-sub> (<sh-exec> "expr" # ...)) #:output ...]
In gash/shell.scm:
289: 9 [sh:substitute-command #<procedure 2da0f560 at gash/eval.scm:129:35=
()>]
270: 8 [%subshell #<procedure v ()>]
In ice-9/boot-9.scm:
157: 7 [catch quit #<procedure v ()> ...]
In ice-9/r4rs.scm:
176: 6 [with-output-to-port #<variable 2de5dc00 value: #<output: file /dev=
/pts/19>> ...]
In srfi/srfi-1.scm:
619: 5 [for-each #<procedure eval-sh (exp)> ((<sh-exec> "expr" # ":" ...))]
In gash/shell.scm:
129: 4 [sh:exec-let () "expr" ...]
92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
616: 2 [for-each #<procedure 2d60f0a0 at gash/shell.scm:70:12 (i)> (0 1 2 =
...)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<input: file /dev/pts/19> "r0" 7]
In unknown file:
?: 0 [fdopen 7 "r0"]
ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
--8<---------------cut here---------------end--------------->8---
And:
--8<---------------cut here---------------start------------->8---
Backtrace:
In ice-9/boot-9.scm:
157: 17 [catch #t #<catch-closure 25cdf0a0> ...]
In unknown file:
?: 16 [apply-smob/1 #<catch-closure 25cdf0a0>]
In ice-9/boot-9.scm:
63: 15 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
432: 14 [eval # #]
In ice-9/boot-9.scm:
793: 13 [call-with-input-file "./configure" ...]
In gash/gash.scm:
121: 12 [#<procedure 262f7700 at gash/gash.scm:120:19 (port)> #<input: ./c=
onfigure 5>]
In gash/repl.scm:
38: 11 [run-repl #<input: ./configure 5> #f]
In gash/environment.scm:
371: 10 [call-with-break #<procedure 26335c00 at gash/shell.scm:400:6 ()>]
In srfi/srfi-1.scm:
616: 9 [for-each #<procedure 26335bd0 at gash/shell.scm:401:18 (value)> #]
In gash/environment.scm:
353: 8 [call-with-continue #<procedure 26315260 at gash/eval.scm:158:14 ()=
>]
In srfi/srfi-1.scm:
619: 7 [for-each #<procedure eval-sh (exp)> (# # #)]
In gash/shell.scm:
441: 6 [sh:cond #]
55: 5 [without-errexit #<procedure 26861c80 at gash/eval.scm:149:6 ()>]
129: 4 [sh:exec-let () "test" "-n" ""]
92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
619: 2 [for-each #<procedure 26272b60 at gash/shell.scm:70:12 (i)> (0 1 2 =
...)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<output: file /dev/pts/19> "w0" 6]
In unknown file:
?: 0 [fdopen 6 "w0"]
ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
--8<---------------cut here---------------end--------------->8---
And:
--8<---------------cut here---------------start------------->8---
Backtrace:
In ice-9/boot-9.scm:
157: 13 [catch #t #<catch-closure 1879d00> ...]
In unknown file:
?: 12 [apply-smob/1 #<catch-closure 1879d00>]
In ice-9/boot-9.scm:
63: 11 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
432: 10 [eval # #]
In ice-9/boot-9.scm:
793: 9 [call-with-input-file "./configure" ...]
In gash/gash.scm:
121: 8 [#<procedure 1e905e0 at gash/gash.scm:120:19 (port)> #<input: ./con=
figure 5>]
In gash/repl.scm:
38: 7 [run-repl #<input: ./configure 5> #f]
In gash/shell.scm:
441: 6 [sh:cond #]
55: 5 [without-errexit #<procedure 2192680 at gash/eval.scm:149:6 ()>]
129: 4 [sh:exec-let () "test" "xi686-unknown-linux-gnu" "!=3D" "x"]
92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
619: 2 [for-each #<procedure 1e06920 at gash/shell.scm:70:12 (i)> (0 1 2 .=
..)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<output: file /dev/pts/19> "w0" 6]
In unknown file:
?: 0 [fdopen 6 "w0"]
ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
--8<---------------cut here---------------end--------------->8---
All these happen before the line:
--8<---------------cut here---------------start------------->8---
checking build system type... i686-unknown-linux-gnu
--8<---------------cut here---------------end--------------->8---
Good news: I was able to reproduce with Gash over Guile 3.0.9:
--8<---------------cut here---------------start------------->8---
ludo@ribbon /tmp/guix-build-gcc-mesboot-4.9.4.drv-0/gcc-4.9.4$ guix build g=
ash
/gnu/store/mz5swdf35iwplrgdvm4z256py585nxi6-gash-0.3.0
ludo@ribbon /tmp/guix-build-gcc-mesboot-4.9.4.drv-0/gcc-4.9.4$ while /gnu/s=
tore/mz5swdf35iwplrgdvm4z256py585nxi6-gash-0.3.0/bin/gash ./configure CONFI=
G_SHELL=3D/gnu/store/98bd49rhyia49y0b9d7sk8phsq14g3nk-gash-boot-0.3.0/bin/b=
ash SHELL=3D/gnu/store/98bd49rhyia49y0b9d7sk8phsq14g3nk-gash-boot-0.3.0/bin=
/bash --prefix=3D/gnu/store/awkbdj5j41pv5kiy9ifs0zl40jamwfw4-gcc-mesboot-4.=
9.4 --enable-fast-install --build=3Dx86_64-unknown-linux-gnu --prefix=3D/gn=
u/store/awkbdj5j41pv5kiy9ifs0zl40jamwfw4-gcc-mesboot-4.9.4 --build=3Di686-u=
nknown-linux-gnu --host=3Di686-unknown-linux-gnu --with-host-libstdcxx=3D-l=
supc++ --with-native-system-header-dir=3D/gnu/store/gc91zbacrk6prhvm91cj3x9=
rr3v2k17q-glibc-mesboot-2.16.0/include --with-build-sysroot=3D/gnu/store/gc=
91zbacrk6prhvm91cj3x9rr3v2k17q-glibc-mesboot-2.16.0/include --disable-boots=
trap --disable-decimal-float --disable-libatomic --disable-libcilkrts --dis=
able-libgomp --disable-libitm --disable-libmudflap --disable-libquadmath --=
disable-libsanitizer --disable-libssp --disable-libvtv --disable-lto --disa=
ble-lto-plugin --disable-multilib --disable-plugin --disable-threads --enab=
le-languages=3Dc,c++ --enable-static --enable-shared --enable-threads=3Dsin=
gle --disable-libstdcxx-pch --disable-build-with-cxx ; do : ;done
[=E2=80=A6]
Backtrace:
In ice-9/boot-9.scm:
1752:10 18 (with-exception-handler _ _ #:unwind? _ #:unwind-for-type _)
In unknown file:
17 (apply-smob/0 #<thunk 7f8e78d15300>)
In ice-9/boot-9.scm:
724:2 16 (call-with-prompt _ _ #<procedure default-prompt-handler (k pr=
oc)>)
In ice-9/eval.scm:
619:8 15 (_ #(#(#<directory (guile-user) 7f8e78d18c80>)))
In ice-9/ports.scm:
433:17 14 (call-with-input-file _ _ #:binary _ #:encoding _ #:guess-enco=
ding _)
In gash/gash.scm:
121:27 13 (_ _)
In gash/repl.scm:
38:14 12 (run-repl _ _)
In gash/environment.scm:
375:8 11 (call-with-break _)
In srfi/srfi-1.scm:
634:9 10 (for-each #<procedure 7f8e75612420 at gash/shell.scm:401:18 (v=
alue)> _)
In gash/environment.scm:
357:8 9 (call-with-continue _)
In srfi/srfi-1.scm:
634:9 8 (for-each #<procedure eval-sh (exp)> _)
634:9 7 (for-each #<procedure eval-sh (exp)> _)
In gash/shell.scm:
55:39 6 (sh:and _ #<procedure 7f8e75656da0 at gash/eval.scm:149:6 ()>)
245:24 5 (_)
159:10 4 (sh:exec-let _ "expr" . _)
92:9 3 (exec-utility _ "/run/current-system/profile/bin/expr" "expr" =
("xliba=E2=80=A6" =E2=80=A6))
In srfi/srfi-1.scm:
634:9 2 (for-each #<procedure 7f8e760654c0 at gash/shell.scm:70:12 (i)=
> _)
In ice-9/ports.scm:
317:17 1 (dup->port _ _ _)
In unknown file:
0 (fdopen 6 "w0")
ERROR: In procedure fdopen:
In procedure scm_fdes_to_port: Bad file descriptor
--8<---------------cut here---------------end--------------->8---
Enough backtraces for now. To be continued=E2=80=A6
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#75658; Package guix.
Full text available.Ludovic Courtès <ludo@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Ludovic Courtès <ludo@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: 75658 <at> debbugs.gnu.org
Subject: Re: bug#75658: Non-deterministic Gash error in
=?utf-8?Q?=E2=80=98gcc-mesboot-4=2E9=2E4=E2=80=99?=
In-Reply-To: <87msfnsrli.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22?=
=?utf-8?Q?'s?= message of "Sat, 18 Jan 2025 23:08:09 +0100")
References: <87msfnsrli.fsf@HIDDEN>
Date: Sun, 19 Jan 2025 19:24:25 +0100
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Ludovic Court=C3=A8s <ludovic.courtes@HIDDEN> skribis:
> I stumbled upon this interesting non-deterministic failure while
> building =E2=80=98gcc-mesboot-4.9.4.drv=E2=80=99 on current =E2=80=98core=
-packages-team=E2=80=99 (which
> is unchanged compared to =E2=80=98master=E2=80=99):
Just got another one:
--8<---------------cut here---------------start------------->8---
checking for struct sigaction.sa_sigaction... yes
checking for volatile sig_atomic_t... yes
checking for sighandler_t... yes
checking for sigprocmask... (cached) yes
checking whether sleep is declared... yes
checking for working sleep... yes
checking for socklen_t... Backtrace:
In gash/shell.scm:
129: 19 [sh:exec-let () "ac_fn_c_try_compile" "2817"]
In gash/environment.scm:
215: 18 [save-variables-excursion () ...]
292: 17 [with-arguments # #<procedure 2210f00 at gash/shell.scm:145:25 ()>]
389: 16 [call-with-return #<procedure 2210e40 at gash/shell.scm:147:28 ()>]
In srfi/srfi-1.scm:
619: 15 [for-each #<procedure eval-sh (exp)> ((<sh-begin> # # # ...))]
619: 14 [for-each #<procedure eval-sh (exp)> (# # # # ...)]
In gash/shell.scm:
441: 13 [sh:cond # #]
55: 12 [without-errexit #<procedure 13185e0 at gash/eval.scm:149:6 ()>]
372: 11 [sh:and #<procedure 1318560 at gash/eval.scm:149:6 ()> ...]
55: 10 [without-errexit #<procedure 1318560 at gash/eval.scm:149:6 ()>]
372: 9 [sh:and #<procedure 1318500 at gash/eval.scm:149:6 ()> ...]
55: 8 [without-errexit #<procedure 1318500 at gash/eval.scm:149:6 ()>]
In srfi/srfi-1.scm:
616: 7 [for-each #<procedure eval-sh (exp)> (# # # # ...)]
619: 6 [for-each #<procedure eval-sh (exp)> (# # #)]
In gash/shell.scm:
245: 5 [#<procedure 1f63030 at gash/shell.scm:239:17 ()>]
129: 4 [sh:exec-let () "grep" "-v" "^ *+" "conftest.err"]
92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
616: 2 [for-each #<procedure ea9a60 at gash/shell.scm:70:12 (i)> (0 1 2 ..=
.)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<input: file 20> "r" 7]
In unknown file:
?: 0 [fdopen 7 "r"]
ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
yes
checking whether symlink handles trailing slash correctly... yes
checking whether <sys/ioctl.h> declares ioctl... yes
checking for unsetenv... yes
checking for unsetenv() return type... int
--8<---------------cut here---------------end--------------->8---
That one likely doesn=E2=80=99t change the build outcome since it still
determines that =E2=80=98socklen_t=E2=80=99 is defined, but it sounds a bit=
like a dice
roll.
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#75658; Package guix.
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Subject: Non-deterministic Gash error in =?utf-8?Q?=E2=80=98gcc-mesboot-4?=
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Hello,
I stumbled upon this interesting non-deterministic failure while
building =E2=80=98gcc-mesboot-4.9.4.drv=E2=80=99 on current =E2=80=98core-p=
ackages-team=E2=80=99 (which
is unchanged compared to =E2=80=98master=E2=80=99):
--8<---------------cut here---------------start------------->8---
source directory: "/tmp/guix-build-gcc-mesboot-4.9.4.drv-0/gcc-4.9.4" (rela=
tive from build: ".")
build directory: "/tmp/guix-build-gcc-mesboot-4.9.4.drv-0/gcc-4.9.4"
configure flags: ("CONFIG_SHELL=3D/gnu/store/bhmkf29xki04mmydpm0axpbh35md4v=
fb-gash-boot-0.3.0/bin/bash" "SHELL=3D/gnu/store/bhmkf29xki04mmydpm0axpbh35=
md4vfb-gash-boot-0.3.0/bin/bash" "--prefix=3D/gnu/store/mgbd56zvid129vkk8l9=
zir7pf46r5038-gcc-mesboot-4.9.4" "--enable-fast-install" "--build=3Dx86_64-=
unknown-linux-gnu" "--prefix=3D/gnu/store/mgbd56zvid129vkk8l9zir7pf46r5038-=
gcc-mesboot-4.9.4" "--build=3Di686-unknown-linux-gnu" "--host=3Di686-unknow=
n-linux-gnu" "--with-host-libstdcxx=3D-lsupc++" "--with-native-system-heade=
r-dir=3D/gnu/store/qxp7icgwbn1hqqwvkan7aljgzfn439zh-glibc-mesboot-2.16.0/in=
clude" "--with-build-sysroot=3D/gnu/store/qxp7icgwbn1hqqwvkan7aljgzfn439zh-=
glibc-mesboot-2.16.0/include" "--disable-bootstrap" "--disable-decimal-floa=
t" "--disable-libatomic" "--disable-libcilkrts" "--disable-libgomp" "--disa=
ble-libitm" "--disable-libmudflap" "--disable-libquadmath" "--disable-libsa=
nitizer" "--disable-libssp" "--disable-libvtv" "--disable-lto" "--disable-l=
to-plugin" "--disable-multilib" "--disable-plugin" "--disable-threads" "--e=
nable-languages=3Dc,c++" "--enable-static" "--enable-shared" "--enable-thre=
ads=3Dsingle" "--disable-libstdcxx-pch" "--disable-build-with-cxx")
Backtrace:
In gash/eval.scm:
221: 19 [eval-sh (<sh-set!> ("ac_useropt" (<sh-cmd-sub> #)))]
In srfi/srfi-1.scm:
642: 18 [for-each #<procedure 1502320 at gash/eval.scm:221:17 (name word)>=
# #]
In gash/eval.scm:
222: 17 [#<procedure 1502320 at gash/eval.scm:221:17 (name word)> "ac_user=
opt" #]
131: 16 [eval-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ...]
121: 15 [expand-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ..=
.]
In gash/shell.scm:
289: 14 [sh:substitute-command #<procedure 15022a0 at gash/eval.scm:129:35=
()>]
270: 13 [%subshell #<procedure v ()>]
In ice-9/boot-9.scm:
157: 12 [catch quit #<procedure v ()> ...]
In ice-9/r4rs.scm:
176: 11 [with-output-to-port #<variable 13a02e0 value: #<output: file 39>>=
...]
In srfi/srfi-1.scm:
619: 10 [for-each #<procedure eval-sh (exp)> ((<sh-pipeline> # #))]
In gash/shell.scm:
344: 9 [sh:pipeline #<procedure 1506f40 at gash/eval.scm:149:6 ()> ...]
310: 8 [plumb #<input: #{read pipe}# 36> #f ...]
270: 7 [%subshell #<procedure thunk* ()>]
In ice-9/boot-9.scm:
157: 6 [catch quit #<procedure thunk* ()> ...]
In gash/shell.scm:
316: 5 [thunk*]
129: 4 [sh:exec-let () "sed" "s/[-+.]/_/g"]
92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
616: 2 [for-each #<procedure ec3b20 at gash/shell.scm:70:12 (i)> (0 1 2 ..=
.)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<input: file 38> "r" 7]
In unknown file:
?: 0 [fdopen 7 "r"]
ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
Backtrace:
In gash/eval.scm:
221: 19 [eval-sh (<sh-set!> ("ac_useropt" (<sh-cmd-sub> #)))]
In srfi/srfi-1.scm:
642: 18 [for-each #<procedure 1502320 at gash/eval.scm:221:17 (name word)>=
# #]
In gash/eval.scm:
222: 17 [#<procedure 1502320 at gash/eval.scm:221:17 (name word)> "ac_user=
opt" #]
131: 16 [eval-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ...]
121: 15 [expand-word (<sh-cmd-sub> (<sh-pipeline> # #)) #:output string ..=
.]
In gash/shell.scm:
289: 14 [sh:substitute-command #<procedure 15022a0 at gash/eval.scm:129:35=
()>]
270: 13 [%subshell #<procedure v ()>]
In ice-9/boot-9.scm:
157: 12 [catch quit #<procedure v ()> ...]
In ice-9/r4rs.scm:
176: 11 [with-output-to-port #<variable 13a02e0 value: #<output: file 39>>=
...]
In srfi/srfi-1.scm:
619: 10 [for-each #<procedure eval-sh (exp)> ((<sh-pipeline> # #))]
In gash/shell.scm:
347: 9 [sh:pipeline #<procedure 1506f40 at gash/eval.scm:149:6 ()> ...]
310: 8 [plumb #f #<output: #{write pipe}# 38> ...]
270: 7 [%subshell #<procedure thunk* ()>]
In ice-9/boot-9.scm:
157: 6 [catch quit #<procedure thunk* ()> ...]
In gash/shell.scm:
316: 5 [thunk*]
129: 4 [sh:exec-let () "printf" "%s\\n" "libsanitizer"]
92: 3 [exec-utility () ...]
In srfi/srfi-1.scm:
616: 2 [for-each #<procedure ec3b20 at gash/shell.scm:70:12 (i)> (0 1 2 ..=
.)]
In ice-9/boot-9.scm:
1473: 1 [dup->port #<input: file 36> "r" 7]
In unknown file:
?: 0 [fdopen 7 "r"]
ERROR: In procedure fdopen:
ERROR: In procedure scm_fdes_to_port: Bad file descriptor
checking build system type... i686-unknown-linux-gnu
checking host system type... i686-unknown-linux-gnu
checking target system type... i686-unknown-linux-gnu
checking for a BSD-compatible install... ./install-sh -c
checking whether ln works... yes
checking whether ln -s works... yes
checking for a sed that does not truncate output... /gnu/store/i61mvrw30k8n=
g8hxym8s180nydnsbji6-gash-utils-boot-0.2.0/bin/sed
checking for gawk... gawk
checking for libsanitizer support... yes
--8<---------------cut here---------------end--------------->8---
What happens is that Gash crashes in the middle of a substitution on
$ac_useropt. As a result, =E2=80=98--disable-libsanitizer=E2=80=99 (and ot=
her options,
it seems) are discarded, hence the =E2=80=9Clibsanitizer support... yes=E2=
=80=9D line.
Hours later, build fails while trying to build libsanitizer.
Any idea what could cause EBADF?
Thanks,
Ludo=E2=80=99.
Ludovic Courtès <ludovic.courtes@HIDDEN>:janneke@HIDDEN, samplet@HIDDEN, bug-guix@HIDDEN.
Full text available.janneke@HIDDEN, samplet@HIDDEN, bug-guix@HIDDEN:bug#75658; Package guix.
Full text available.
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