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From: Mark H Weaver <mhw@HIDDEN>
To: Andrea Azzarone <azzaronea@HIDDEN>
Subject: Re: [PATCH] Fix gc.test "after-gc-hook gets called" failures
References: <CAGqc0-qLAS+Or-rpEFxjkmAhfif6jiAQuo+EdpCt24PHT31akg@HIDDEN>
Date: Tue, 16 Apr 2019 17:38:00 -0400
In-Reply-To: <CAGqc0-qLAS+Or-rpEFxjkmAhfif6jiAQuo+EdpCt24PHT31akg@HIDDEN>
(Andrea Azzarone's message of "Thu, 11 Apr 2019 16:43:23 +0100")
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Hi Andrea,
Andrea Azzarone <azzaronea@HIDDEN> writes:
> "after-gc-hook gets called" test randomly fails as reported
> downstream, for example:
> - https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31776
> - https://bugs.launchpad.net/ubuntu/+source/guile-2.2/+bug/1823459
>
> I'm attaching a patch that seems to fix the failures.
>
> From 2efba337d5b636cd975260f19ea74e27ecf0ca17 Mon Sep 17 00:00:00 2001
> From: Andrea Azzarone <andrea.azzarone@HIDDEN>
> Date: Thu, 11 Apr 2019 16:30:58 +0100
> Subject: Fix gc.test "after-gc-hook gets called" failures
>
> * libguile/scmsigs.c: Call scm_async_tick to give any pending asyncs a chance to
> run before we block indefinitely waiting for a signal to arrive.
Thanks for this. I pushed your commit (with minor reformatting) to our
'stable-2.2' branch as commit 546b0e87294b837ec29164d87cf17102e9aeee0c.
I believe that this will prevent the problem from happening in the most
common cases, e.g. when there's only one user-visible thread, or when
there are no long-sleeping user-visible threads.
However, it occurs to me that in a multithreaded Guile program, a user
thread might trigger a GC and then sleep for a long time, without
calling 'scm_async_tick' in between. If we're unlucky and the
'after_gc_async' gets queued in the wrong thread, it might be a long
time before the hook runs.
Fundamentally, the problem we face here is similar to the thorny
problems faced with finalizers and signal handlers: we must choose a
proper time and context for them to be run safely, when the data they
need to access is in a consistent state, etc.
To deal with the issues around finalizers, Guile recently gained a
finalizer thread. It may be that we should arrange to run the
'after_gc_async' in the finalizer thread as well, instead of whatever
random thread we happen to be in when GC is triggered.
Thoughts?
Regards,
Mark
bug-guile@HIDDEN:bug#31776; Package guile.
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From: =?utf-8?Q?G=C3=B6ran?= Weinholt <goran@HIDDEN>
To: Rob Browning <rlb@HIDDEN>
Subject: Re: bug#31776: guile-2.2: FTBFS on armhf: FAIL:
gc.test: gc: after-gc-hook gets called
References: <152796556058.30262.13172727695488534983.reportbug@tatooine>
<874liar1ic.fsf@HIDDEN>
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In-Reply-To: <878t67td3t.fsf@HIDDEN> (Rob Browning's message
of "Thu, 19 Jul 2018 11:16:38 -0500")
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Rob Browning <rlb@HIDDEN> writes:
> Rob Browning <rlb@HIDDEN> writes:
>
>> Rob Browning <rlb@HIDDEN> writes:
>>
>>> It looks like gc.test may be failing intermittently in Debian (see belo=
w).
>>> Searching around I saw at least one other report of this in the #guile
>>> logs from last year.
>>>
>>> For now, I'm wondering if if would be plausible to mark the test as
>>> unresolved to avoid guile-2.2's removal from Debian testing, or if the
>>> failure is likely to indicate a problem serious enough to warrant that
>>> removal.
>>
>> Just wanted to check back about this. It's caused a build on the buildds
>> to fail again.
>
> As an update, If we don't resolve this, guile-2.2 will be removed from
> Debian testing this weekend.
Hello Rob,
The test fails with 2.2.4+1-1 on amd64 as well:
https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/guile-2.=
2.html
It's really tricky to get it to fail predictably, but you can even your
odds by testing only asyncs.test and gc.test:
apt-get source guile-2.2
cd guile-2.2-2.2.4+1
dpkg-buildpackage -us -uc
mkdir test-suite/async-tests
cp test-suite/tests/{asyncs,gc}.test test-suite/async-tests/
meta/guile --debug -L $PWD/test-suite --no-auto-compile \
-e main -s $PWD/test-suite/guile-test \
--test-suite $PWD/test-suite/async-tests \
--log-file check-guile-async.log
Try the last command around a dozen times and it'll fail eventually.
I didn't get further with debugging than determining that something
probably goes wrong in the interaction between queue_after_gc_hook(),
scm_i_async_push() and scm_i_async_pop(). Every time there was a
failure, this condition was false (the cdr was set to empty list):
if (scm_is_false (SCM_CDR (after_gc_async_cell)))
{
SCM_SETCDR (after_gc_async_cell, t->pending_asyncs);
t->pending_asyncs =3D after_gc_async_cell;
}
Regards,
=2D-=20
G=C3=B6ran Weinholt
Debian developer
73 de SA6CJK
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bug-guile@HIDDEN:bug#31776; Package guile.
Full text available.Received: (at 31776) by debbugs.gnu.org; 19 Jul 2018 16:16:41 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Jul 19 12:16:41 2018 Received: from localhost ([127.0.0.1]:48459 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fgBbd-0002Y3-Ey for submit <at> debbugs.gnu.org; Thu, 19 Jul 2018 12:16:41 -0400 Received: from defaultvalue.org ([45.33.119.55]:47372 ident=postfix) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <rlb@HIDDEN>) id 1fgBbb-0002Xv-N7 for 31776 <at> debbugs.gnu.org; Thu, 19 Jul 2018 12:16:40 -0400 Received: from trouble.defaultvalue.org (localhost [127.0.0.1]) (Authenticated sender: rlb@HIDDEN) by defaultvalue.org (Postfix) with ESMTPSA id E3D8F2017D; Thu, 19 Jul 2018 11:16:38 -0500 (CDT) Received: by trouble.defaultvalue.org (Postfix, from userid 1000) id 3B21D14E551; Thu, 19 Jul 2018 11:16:38 -0500 (CDT) From: Rob Browning <rlb@HIDDEN> To: 31776 <at> debbugs.gnu.org Subject: Re: bug#31776: guile-2.2: FTBFS on armhf: FAIL: gc.test: gc: after-gc-hook gets called In-Reply-To: <87muvuwfli.fsf@HIDDEN> References: <152796556058.30262.13172727695488534983.reportbug@tatooine> <874liar1ic.fsf@HIDDEN> <87muvuwfli.fsf@HIDDEN> Date: Thu, 19 Jul 2018 11:16:38 -0500 Message-ID: <878t67td3t.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 31776 Cc: Emilio Pozuelo Monfort <pochu@HIDDEN>, 900652@HIDDEN, 900652-forwarded@HIDDEN, guile-devel@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: -1.0 (-) Rob Browning <rlb@HIDDEN> writes: > Rob Browning <rlb@HIDDEN> writes: > >> It looks like gc.test may be failing intermittently in Debian (see below). >> Searching around I saw at least one other report of this in the #guile >> logs from last year. >> >> For now, I'm wondering if if would be plausible to mark the test as >> unresolved to avoid guile-2.2's removal from Debian testing, or if the >> failure is likely to indicate a problem serious enough to warrant that >> removal. > > Just wanted to check back about this. It's caused a build on the buildds > to fail again. As an update, If we don't resolve this, guile-2.2 will be removed from Debian testing this weekend. Thanks -- Rob Browning rlb @defaultvalue.org and @debian.org GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4
bug-guile@HIDDEN:bug#31776; Package guile.
Full text available.Received: (at 31776) by debbugs.gnu.org; 16 Jun 2018 22:07:07 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Jun 16 18:07:07 2018 Received: from localhost ([127.0.0.1]:52198 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fUJLf-0007Od-Df for submit <at> debbugs.gnu.org; Sat, 16 Jun 2018 18:07:07 -0400 Received: from defaultvalue.org ([45.33.119.55]:48796 ident=postfix) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <rlb@HIDDEN>) id 1fUJLe-0007OV-B5 for 31776 <at> debbugs.gnu.org; Sat, 16 Jun 2018 18:07:06 -0400 Received: from trouble.defaultvalue.org (localhost [127.0.0.1]) (Authenticated sender: rlb@HIDDEN) by defaultvalue.org (Postfix) with ESMTPSA id 8F9B62038F; Sat, 16 Jun 2018 17:07:05 -0500 (CDT) Received: by trouble.defaultvalue.org (Postfix, from userid 1000) id 2706214E550; Sat, 16 Jun 2018 17:07:05 -0500 (CDT) From: Rob Browning <rlb@HIDDEN> To: 31776 <at> debbugs.gnu.org Subject: Re: bug#31776: guile-2.2: FTBFS on armhf: FAIL: gc.test: gc: after-gc-hook gets called In-Reply-To: <874liar1ic.fsf@HIDDEN> References: <152796556058.30262.13172727695488534983.reportbug@tatooine> <874liar1ic.fsf@HIDDEN> Date: Sat, 16 Jun 2018 17:07:05 -0500 Message-ID: <87muvuwfli.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 31776 Cc: Emilio Pozuelo Monfort <pochu@HIDDEN>, 900652@HIDDEN, 900652-forwarded@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: -1.0 (-) Rob Browning <rlb@HIDDEN> writes: > It looks like gc.test may be failing intermittently in Debian (see below). > Searching around I saw at least one other report of this in the #guile > logs from last year. > > For now, I'm wondering if if would be plausible to mark the test as > unresolved to avoid guile-2.2's removal from Debian testing, or if the > failure is likely to indicate a problem serious enough to warrant that > removal. Just wanted to check back about this. It's caused a build on the buildds to fail again. Thanks -- Rob Browning rlb @defaultvalue.org and @debian.org GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4
bug-guile@HIDDEN:bug#31776; Package guile.
Full text available.Received: (at submit) by debbugs.gnu.org; 10 Jun 2018 17:32:28 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Jun 10 13:32:28 2018 Received: from localhost ([127.0.0.1]:42527 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fS4CZ-00083Q-O3 for submit <at> debbugs.gnu.org; Sun, 10 Jun 2018 13:32:27 -0400 Received: from eggs.gnu.org ([208.118.235.92]:36174) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <rlb@HIDDEN>) id 1fS4CW-00083A-Ob for submit <at> debbugs.gnu.org; Sun, 10 Jun 2018 13:32:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <rlb@HIDDEN>) id 1fS4CQ-0001Lz-Cy for submit <at> debbugs.gnu.org; Sun, 10 Jun 2018 13:32:19 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:55861) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <rlb@HIDDEN>) id 1fS4CQ-0001Lo-9D for submit <at> debbugs.gnu.org; Sun, 10 Jun 2018 13:32:18 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55374) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <rlb@HIDDEN>) id 1fS4CO-00079V-UM for bug-guile@HIDDEN; Sun, 10 Jun 2018 13:32:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <rlb@HIDDEN>) id 1fS4CL-0001He-QR for bug-guile@HIDDEN; Sun, 10 Jun 2018 13:32:16 -0400 Received: from defaultvalue.org ([45.33.119.55]:53674) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <rlb@HIDDEN>) id 1fS4CL-0001Gd-K2 for bug-guile@HIDDEN; Sun, 10 Jun 2018 13:32:13 -0400 Received: from trouble.defaultvalue.org (localhost [127.0.0.1]) (Authenticated sender: rlb@HIDDEN) by defaultvalue.org (Postfix) with ESMTPSA id 480D22008C; Sun, 10 Jun 2018 12:32:12 -0500 (CDT) Received: by trouble.defaultvalue.org (Postfix, from userid 1000) id E970F14E550; Sun, 10 Jun 2018 12:32:11 -0500 (CDT) From: Rob Browning <rlb@HIDDEN> To: bug-guile@HIDDEN Subject: guile-2.2: FTBFS on armhf: FAIL: gc.test: gc: after-gc-hook gets called In-Reply-To: <152796556058.30262.13172727695488534983.reportbug@tatooine> References: <152796556058.30262.13172727695488534983.reportbug@tatooine> Date: Sun, 10 Jun 2018 12:32:11 -0500 Message-ID: <874liar1ic.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: submit Cc: Emilio Pozuelo Monfort <pochu@HIDDEN>, 900652@HIDDEN, 900652-forwarded@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: -6.0 (------) It looks like gc.test may be failing intermittently in Debian (see below). Searching around I saw at least one other report of this in the #guile logs from last year. For now, I'm wondering if if would be plausible to mark the test as unresolved to avoid guile-2.2's removal from Debian testing, or if the failure is likely to indicate a problem serious enough to warrant that removal. Emilio Pozuelo Monfort <pochu@HIDDEN> writes: > Your package failed to build on armhf: > > Running gc.test > FAIL: gc.test: gc: after-gc-hook gets called > [...] > Totals for this test run: > passes: 40732 > failures: 1 > unexpected passes: 0 > expected failures: 10 > unresolved test cases: 578 > untested test cases: 1 > unsupported test cases: 1 > errors: 0 > > FAIL: check-guile > ================================== > 1 of 1 test failed > > > Full log at https://buildd.debian.org/status/package.php?p=guile-2.2 Thanks -- Rob Browning rlb @defaultvalue.org and @debian.org GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4
Rob Browning <rlb@HIDDEN>:bug-guile@HIDDEN.
Full text available.bug-guile@HIDDEN:bug#31776; Package guile.
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