Debian Bug report logs - #920455
bash 5.0 "wait" builtin waits on "process substitution" subprocesses

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Paul Gevers <elbrus@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: monkeysphere: autopkgtest times out since 2019-01-15

Date: Mon, 21 Jan 2019 21:10:04 +0100

[Message part 1 (text/plain, inline)]

Source: monkeysphere
Version: 0.42-2
X-Debbugs-CC: debian-ci@lists.debian.org
User: debian-ci@lists.debian.org
Usertags: timeout

Dear maintainers,

Since 2019-01-15 the autopkgtest of your package times out (after 5:33h)
on ci.debian.net. Unfortunately, this most likely isn't caused by any of
your direct (test) dependencies, otherwise the integration with our
migration software should have caught it. The timeout also happens in
testing. If the content of our log is correct, the following file may
hint at the culprit:
https://ci.debian.net/data/packages/unstable/amd64/m/monkeysphere/1702253.log

Can you please investigate the situation? Don't hesitate to ask for help
for the Debian CI team² if you need help solving this issue.

I will blacklist this package on the ci.debian.net infrastructure and
will remove the blacklist once this bug is fixed. If needed, please ping
me to try any uploads you make that should fix the issue if you are
unsure and don't want to close this bug until verified.

Paul

https://ci.debian.net/data/autopkgtest/unstable/amd64/m/monkeysphere/1702253/log.gz

autopkgtest [02:55:29]: test command1: MONKEYSPHERE_TEST_USE_SYSTEM=true
MONKEYSPHERE_TEST_NO_EXAMINE=true tests/keytrans
autopkgtest [02:55:29]: test command1: [-----------------------
##################################################
### generating openpgp key...
gpg: keybox
'/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/pubring.kbx'
created
gpg:
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/trustdb.gpg:
trustdb created
gpg: key 515667CB7A465F5B marked as ultimately trusted
gpg: directory
'/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/openpgp-revocs.d'
created
gpg: revocation certificate stored as
'/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/openpgp-revocs.d/ECA7B410D7EACF52BD65C93D515667CB7A465F5B.rev'
gpg: done
##################################################
### retrieving key timestamp...
gpg: checking the trustdb
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
##################################################
### exporting key to ssh file...
##################################################
### reconvert key, and compare to key in gpg keyring...
tests/keytrans: line 116: hd: command not found
tests/keytrans: line 116: hd: command not found
conversions look good!
Now working with key 515667CB7A465F5B at time 1547520929
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/pubring.kbx
--------------------------------------------------------------------------------
pub   rsa1024 2019-01-15 [SC]
      ECA7B410D7EACF52BD65C93D515667CB7A465F5B
uid           [ultimate] testtest

##################################################
### test User ID addition...
gpg: key 515667CB7A465F5B: "monkeymonkey" 1 new user ID
gpg: key 515667CB7A465F5B: "monkeymonkey" 1 new signature
gpg: Total number processed: 1
gpg:           new user IDs: 1
gpg:         new signatures: 1
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/pubring.kbx
--------------------------------------------------------------------------------
pub   rsa1024 2019-01-15 [SC]
      ECA7B410D7EACF52BD65C93D515667CB7A465F5B
uid           [ultimate] monkeymonkey
uid           [ultimate] testtest

##################################################
### sleeping to avoid test suite breakage on fast
### processors (see http://bugs.debian.org/591118)
##################################################
### test User ID revocation ...
gpg: key 515667CB7A465F5B: "monkeymonkey" 1 new signature
gpg: Total number processed: 1
gpg:         new signatures: 1
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/pubring.kbx
--------------------------------------------------------------------------------
pub   rsa1024 2019-01-15 [SC]
      ECA7B410D7EACF52BD65C93D515667CB7A465F5B
uid           [ultimate] monkeymonkey
uid           [ revoked] testtest

##################################################
### test working with two primary keys ...
Generating public/private rsa key pair.
Your identification has been saved in
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/newkey.
Your public key has been saved in
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src/tests/tmp/ms.Aen/newkey.pub.
The key fingerprint is:
SHA256:bkxbi7yfQk2tOxq47Oc28CuCwkkhQZFWQ7bqJK+pyig debci@ci-1547520907
The key's randomart image is:
+---[RSA 1024]----+
|.o==             |
|.o. o            |
|.. .       .     |
|...       . .    |
|oo.     So..     |
|+o    .*.+o.     |
|o.o.  .+O ..     |
|E=. ...o*oo.     |
|Xo   o+==*o.     |
+----[SHA256]-----+
gpg: key D5173D3DD7173342: public key "fubar" imported
gpg: key D5173D3DD7173342: secret key imported
gpg: Total number processed: 1
gpg:               imported: 1
gpg:       secret keys read: 1
gpg:   secret keys imported: 1
gpg: key 515667CB7A465F5B: "monkeymonkey" 1 new user ID
gpg: key 515667CB7A465F5B: "monkeymonkey" 1 new signature
gpg: Total number processed: 1
gpg:           new user IDs: 1
gpg:         new signatures: 1
test: diff expected gpg list output
test: diff expected keytrans listfpr output
##################################################
 Monkeysphere keytrans test completed successfully!
##################################################
### removing temp dir...
autopkgtest [05:42:09]: ERROR: timed out on command "su -s /bin/bash
debci -c set -e; export USER=`id -nu`; . /etc/profile >/dev/null 2>&1 ||
true;  . ~/.profile >/dev/null 2>&1 || true;
buildtree="/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/build.mHf/src"; mkdir
-p -m 1777 --
"/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/command1-artifacts"; export
AUTOPKGTEST_ARTIFACTS="/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/command1-artifacts";
export ADT_ARTIFACTS="$AUTOPKGTEST_ARTIFACTS"; mkdir -p -m 755
"/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/autopkgtest_tmp"; export
AUTOPKGTEST_TMP="/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/autopkgtest_tmp";
export ADTTMP="$AUTOPKGTEST_TMP"; export DEBIAN_FRONTEND=noninteractive;
export LANG=C.UTF-8; export DEB_BUILD_OPTIONS=parallel=2; unset LANGUAGE
LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE   LC_MONETARY LC_MESSAGES
LC_PAPER LC_NAME LC_ADDRESS   LC_TELEPHONE LC_MEASUREMENT
LC_IDENTIFICATION LC_ALL;rm -f /tmp/autopkgtest_script_pid; set -C; echo
$$ > /tmp/autopkgtest_script_pid; set +C; trap "rm -f
/tmp/autopkgtest_script_pid" EXIT INT QUIT PIPE; cd "$buildtree"; touch
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/command1-stdout
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/command1-stderr; bash -ec
'MONKEYSPHERE_TEST_USE_SYSTEM=true MONKEYSPHERE_TEST_NO_EXAMINE=true
tests/keytrans' 2> >(tee -a
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/command1-stderr >&2) > >(tee -a
/tmp/autopkgtest-lxc.ag9y0j3e/downtmp/command1-stdout);" (kind: test)
autopkgtest [05:42:09]: test command1: -----------------------]

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Message #10 received at 920038@bugs.debian.org (full text, mbox, reply):

From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

To: Paul Gevers <elbrus@debian.org>, 920038@bugs.debian.org

Subject: Re: [Pkg-privacy-maintainers] Bug#920038: monkeysphere: autopkgtest times out since 2019-01-15

Date: Thu, 24 Jan 2019 15:57:32 -0500

[Message part 1 (text/plain, inline)]

Control: tags 920038 + help

On Mon 2019-01-21 21:10:04 +0100, Paul Gevers wrote:
> Since 2019-01-15 the autopkgtest of your package times out (after 5:33h)
> on ci.debian.net.

Thanks for the heads-up, Paul.  Looking at this more closely:

> autopkgtest [02:55:29]: test command1: MONKEYSPHERE_TEST_USE_SYSTEM=true MONKEYSPHERE_TEST_NO_EXAMINE=true tests/keytrans

This is apparently timing out on this first test, not even getting to tests/basic.

and it ends with:

> ##################################################
>  Monkeysphere keytrans test completed successfully!
> ##################################################
> ### removing temp dir...

which is what i would expect, invoking the cleanup() bash function from
tests/common:

------
cleanup() {
    echo "### removing temp dir..."
    rm -rf "$TEMPDIR"

    if [ "$SSHD_PID" ] ; then
        echo "### killing off lingering sshd..."
        kill "$SSHD_PID"
    fi

    wait
}
------

So i imagine that it's hanging forever in the wait function.  I'll add a
"jobs" invocation before that for future tests to be able to see what
it's waiting on, i guess, but i don't see why that would have changed
from one invocation to the next.

i do note that the failure happened across a bash upgrade:

--- previous-run/testbed-packages
+++ current-run/testbed-packages
@@ -2,7 +2,7 @@
 apt	1.8.0~alpha3
 base-files	10.1
 base-passwd	3.5.45
-bash	4.4.18-3.1
+bash	5.0-1
 binutils	2.31.1-11
 binutils-common	2.31.1-11
 binutils-x86-64-linux-gnu	2.31.1-11


Since bash essential, it's not listed as an explicit dependency in
monkeysphere.  That said, i can easily run this test with bash 5.0-1 on
my own systems and have no hanging problem.

So i'm mystified by this, and would appreciate any help figuring it out.

   --dkg

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Message #17 received at 920038@bugs.debian.org (full text, mbox, reply):

From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

To: 920038@bugs.debian.org, Paul Gevers <elbrus@debian.org>

Cc: Antonio Terceiro <terceiro@debian.org>

Subject: Re: [Pkg-privacy-maintainers] Bug#920038: monkeysphere: autopkgtest times out since 2019-01-15

Date: Fri, 25 Jan 2019 12:47:24 -0500

[Message part 1 (text/plain, inline)]

Control: clone 920038 -2
Control: retitle -2 bash 5.0 "wait" builtin waits on "process substitution" subprocesses
Control: reassign -2 bash
Control: found -1 5.0-1
Control: notfound -1 4.4-5
Control: block 920038 with -2
Control: affects -2 monkeysphere debci autopkgtest

On Thu 2019-01-24 15:57:32 -0500, Daniel Kahn Gillmor wrote:
> Since bash essential, it's not listed as an explicit dependency in
> monkeysphere.  That said, i can easily run this test with bash 5.0-1 on
> my own systems and have no hanging problem.
>
> So i'm mystified by this, and would appreciate any help figuring it out.

After some digging, this appears to be due to a change the bash, noted
in the upstream changelog in the section titled: "changes between this
version, bash-5.0-alpha, and the previous version, bash-4.4-release.":

    yyy. `wait' without arguments attempts to wait for all active process
         substitution processes.

Many thanks to terceiro on on #debci on irc.oftc.net, whose debugging
efforts helped me uncover the root cause here.

The attached reproducer scripts terminate promptly with bash 4.4-5 but
hang forever with bash 5.0-1.  The concern is that a bash script doesn't
know how it was invoked, so any invocation of the "wait" builtin with no
arguments is potentially dangerous under this new mechanism used by bash
5.0.

This causes the monkeysphere debci to hang because (a) the monkeysphere
keytrans test is a bash script which uses the "wait" builtin without
arguments, and (b) autopkgtest itself invokes the monkeysphere keytrans
test as something like:

    tests/keytrans > >(tee -a …/command1-stdout) 2> >(tee -a …/command1-stderr)

So i think this is a regression in bash, which is why i've done the
above bug cloning.  I'm happy to hear arguments for a different
interpretation, or suggestions on what tests/keytrans should do
differently.  I note that "jobs" returns nothing under both bash 4.4-5
and 5.0-1.

i note that i'd expect the process substitution to happen in the parent
of the keytrans bash process, and that the keytrans bash process
shouldn't even know about the process substitution.  It's a little
mysterious to me how it even knows about those processes to wait on
them.  Maybe bash notices that the thing it's going to invoke is a bash
script, so it only fork()s (skipping the exec("tests/keytrans")), and
somehow fails to clean up some table of subprocesses in the meantime?
Sorry i have no clear diagnosis of how this issue should be fixed.

Regards,

        --dkg

[wait-hang-behavior.bash (text/x-sh, inline)]

#!/bin/bash
# Title: ./wait-hang-behavior.bash
# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

# This script and its companion ./wait-hang-behavior-2.bash together
# demonstrate a change between bash 4.4-5 and 5.0-1, having to do with
# "wait" and >()-style process substitution.

# on bash 4.4-5, this script terminates promptly.

# on bash 5.0-1, this hangs forever and never prints "we are done"

# neither of them emit anything from the sub-process's invocation of
# "jobs"

# See https://bugs.debian.org/920038 for more details.

./wait-hang-behavior-2.bash > >(tee -p ./stdout)
echo we are done

[wait-hang-behavior-2.bash (text/x-sh, inline)]

#!/bin/bash
# Title: ./wait-hang-behavior-2.bash
# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

# this is a trivially correct shell script that should just print "hi
# there" and terminate promptly.

# it is broken (it hangs forever) if invoked by its companion,
# ./wait-hang-behavior.bash

echo hi there
jobs
wait

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Message #34 received at 920455@bugs.debian.org (full text, mbox, reply):

From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

To: 920455@bugs.debian.org

Subject: followup on bash process substitution and wait

Date: Fri, 25 Jan 2019 15:02:41 -0500

[Message part 1 (text/plain, inline)]

looks like what's happening is that the parent bash process doesn't
invoke the process substitution itself.   Rather, the subprocess that
will exec the command itself *first* spawns a grandchild process for the
process execution, before execing the expected command.

that means that wait(-1) of the expected command is going to hang
because it's waiting on a child process that it doesn't know about.

here's the relevant strace info:

$ strace -T -tt -f -e wait4,clone,execve ./wait-hang-behavior.bash 
14:58:44.997547 execve("./wait-hang-behavior.bash", ["./wait-hang-behavior.bash"], 0x7ffccd028678 /* 53 vars */) = 0 <0.000508>
14:58:45.006079 clone(strace: Process 12365 attached
child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f6b51955a10) = 12365 <0.000207>
[pid 12364] 14:58:45.006703 wait4(-1,  <unfinished ...>
[pid 12365] 14:58:45.007253 clone(strace: Process 12366 attached
child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f6b51955a10) = 12366 <0.000081>
[pid 12365] 14:58:45.007599 execve("./wait-hang-behavior-2.bash", ["./wait-hang-behavior-2.bash"], 0x563b2c6c4c50 /* 53 vars */) = 0 <0.000260>
[pid 12366] 14:58:45.008281 clone(strace: Process 12367 attached
child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f6b51955a10) = 12367 <0.000088>
[pid 12366] 14:58:45.008577 wait4(-1,  <unfinished ...>
[pid 12367] 14:58:45.008658 execve("/usr/bin/tee", ["tee", "-p", "./stdout"], 0x563b2c6c4c50 /* 53 vars */) = 0 <0.000166>
hi there
[pid 12365] 14:58:45.011442 wait4(-1,   C-c C-c <unfinished ...>
[pid 12364] 14:59:04.039138 <... wait4 resumed> 0x7fff384a5340, 0, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <19.032359>
strace: Process 12364 detached
strace: Process 12365 detached
strace: Process 12366 detached
strace: Process 12367 detached

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Message #41 received at 920455@bugs.debian.org (full text, mbox, reply):

From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

To: 920455@bugs.debian.org

Subject: Re: followup on bash process substitution and wait

Date: Fri, 12 Apr 2019 14:04:23 -0400

[Message part 1 (text/plain, inline)]

Control: forwarded 920455 https://lists.gnu.org/archive/html/bug-bash/2019-04/msg00076.html

https://bugs.debian.org/920455 is being discussed with upstream over on
the bug-bash@gnu.org mailing list.

    --dkg

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Message #48 received at 920455@bugs.debian.org (full text, mbox, reply):

From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

To: 920455@bugs.debian.org

Subject: Re: followup on bash process substitution and wait

Date: Mon, 15 Apr 2019 18:33:23 -0400

[Message part 1 (text/plain, inline)]

Control: tags 920455 + patch

After some discussion, upstream proposed the attached patch, which can
be dropped into debian/patches and listed in debian/patches/series.

Chet says "In the meantime, distributions are free to take the change
and apply it to their versions."

I've pushed this to the fix-920455 branch on
https://salsa.debian.org/debian/bash as well, if that makes it easier to
adopt.

          --dkg

[0024-wait-builtin-avoid-hanging-on-inherited-children.patch (text/x-diff, inline)]

From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Mon, 15 Apr 2019 18:26:33 -0400
Subject: wait builtin: avoid hanging on inherited children

in https://lists.gnu.org/archive/html/bug-bash/2019-04/msg00096.html,
Chet Ramey proposes this fix to avoid the wait builtin hanging on
previously unknown children.

This addresses debian bug #920455.
---
 jobs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jobs.c b/jobs.c
index ce2bdf2..2c24537 100644
--- a/jobs.c
+++ b/jobs.c
@@ -2488,7 +2488,7 @@ wait_for_background_pids ()
     r = wait_for (last_procsub_child->pid);
   wait_procsubs ();
   reap_procsubs ();
-#if 1
+#if 0
   /* We don't want to wait indefinitely if we have stopped children. */
   /* XXX - should add a loop that goes through the list of process
      substitutions and waits for each proc in turn before this code. */

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Message #55 received at 920455-close@bugs.debian.org (full text, mbox, reply):

From: Matthias Klose <doko@debian.org>

To: 920455-close@bugs.debian.org

Subject: Bug#920455: fixed in bash 5.0-4

Date: Thu, 18 Apr 2019 04:33:37 +0000

Source: bash
Source-Version: 5.0-4

We believe that the bug you reported is fixed in the latest version of
bash, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 920455@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Matthias Klose <doko@debian.org> (supplier of updated bash package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


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Hash: SHA256

Format: 1.8
Date: Thu, 18 Apr 2019 06:12:36 +0200
Source: bash
Architecture: source
Version: 5.0-4
Distribution: unstable
Urgency: medium
Maintainer: Matthias Klose <doko@debian.org>
Changed-By: Matthias Klose <doko@debian.org>
Closes: 920455
Changes:
 bash (5.0-4) unstable; urgency=medium
 .
   * wait builtin: avoid hanging on inherited children. Closes: #920455.
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Message #60 received at 920455@bugs.debian.org (full text, mbox, reply):

From: Paul Gevers <elbrus@debian.org>

To: 920455@bugs.debian.org, 920038@bugs.debian.org

Subject: Re: Bug#920455 closed by Matthias Klose <doko@debian.org> (Bug#920455: fixed in bash 5.0-4)

Date: Thu, 18 Apr 2019 11:20:26 +0200

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Hi Daniel, Doko

On 18-04-2019 06:36, Debian Bug Tracking System wrote:
> #920455: bash 5.0 "wait" builtin waits on "process substitution" subprocesses
> 
> It has been closed by Matthias Klose <doko@debian.org>.

I confirm that with this version of bash the autopkgtest timeout of
monkeysphere on the ci.d.n infrastructure is gone. I'll unblock bash so
it can migrate to buster and I'll lift the blacklist when it lands there.

Paul

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