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This queue is for tickets about the MooseX-Workers CPAN distribution.

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The Basics
Id: 127397
Status: open
Priority: 0/
Queue: MooseX-Workers

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Owner: Nobody in particular
Requestors: SREZIC [...] cpan.org
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Bug Information
Severity: (no value)
Broken in: 0.24
Fixed in: (no value)



Subject: Test suite may hang
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Occasionally t/01.worker.t or t/20.worker.SIG.TERM.t or other test files may hang. I saw this on various linux and freebsd systems. Sorry, I have no more information, but I can try to do more debugging (e.g. create an strace or truss log or so) if it helps.
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I just got a test fail with some kind of crash in 01.worker.t: http://www.cpantesters.org/cpan/report/bacd43d0-d247-11e8-b826-de477de8827f Everything passes cleanly here. I suspect the problem is not in this module.
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On 2018-10-18 20:42:28, RKITOVER wrote: Show quoted text
> I just got a test fail with some kind of crash in 01.worker.t: > > http://www.cpantesters.org/cpan/report/bacd43d0-d247-11e8-b826-de477de8827f > > Everything passes cleanly here. > > I suspect the problem is not in this module.
The fail:pass ratio on CPAN Testers is currently at 14:1474. But I suspect that most testers don't make sure that a hanging test suite is generating a fail report, so the ratio is probably higher. In any case, the problem does not happen always. I just tried the test suite in a clean docker environment (based on debian:stretch) and had to run about 30 iterations until the test suite was hanging.
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On 2018-10-19 03:01:45, SREZIC wrote: Show quoted text
> On 2018-10-18 20:42:28, RKITOVER wrote:
> > I just got a test fail with some kind of crash in 01.worker.t: > > > > http://www.cpantesters.org/cpan/report/bacd43d0-d247-11e8-b826- > > de477de8827f > > > > Everything passes cleanly here. > > > > I suspect the problem is not in this module.
> > The fail:pass ratio on CPAN Testers is currently at 14:1474. But I > suspect that most testers don't make sure that a hanging test suite is > generating a fail report, so the ratio is probably higher. In any > case, the problem does not happen always. I just tried the test suite > in a clean docker environment (based on debian:stretch) and had to run > about 30 iterations until the test suite was hanging.
To reproduce this, the following may be saved as a Dockerfile; the run instruction is in the first line. It'll take some iterations and minutes until the test suite starts to hang. # docker build -t perl-test . && while docker run perl-test; do sleep 1; done FROM debian:stretch RUN echo "cache invalidation #20181019" RUN apt-get -y update RUN apt-get -y install perl-modules RUN apt-get -y install make # Speed up installation RUN apt-get -y install libmoose-perl RUN apt-get -y install libpoe-perl RUN apt-get -y install libpackage-stash-perl libtry-tiny-perl libdatetime-perl RUN perl -MCPAN -e 'CPAN::Index->reload' RUN perl -i -pe 's{.*index_expire.*}{index_expire=>1,}' /root/.cpan/CPAN/MyConfig.pm CMD cpan -t RKITOVER/MooseX-Workers-0.24.tar.gz
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On 2018-10-26 12:14:39, SREZIC wrote: Show quoted text
> On 2018-10-19 03:01:45, SREZIC wrote:
> > On 2018-10-18 20:42:28, RKITOVER wrote:
> > > I just got a test fail with some kind of crash in 01.worker.t: > > > > > > http://www.cpantesters.org/cpan/report/bacd43d0-d247-11e8-b826- > > > de477de8827f > > > > > > Everything passes cleanly here. > > > > > > I suspect the problem is not in this module.
> > > > The fail:pass ratio on CPAN Testers is currently at 14:1474. But I > > suspect that most testers don't make sure that a hanging test suite > > is > > generating a fail report, so the ratio is probably higher. In any > > case, the problem does not happen always. I just tried the test suite > > in a clean docker environment (based on debian:stretch) and had to > > run > > about 30 iterations until the test suite was hanging.
> > To reproduce this, the following may be saved as a Dockerfile; the run > instruction is in the first line. It'll take some iterations and > minutes until the test suite starts to hang. > > > # docker build -t perl-test . && while docker run perl-test; do sleep > 1; done > FROM debian:stretch > RUN echo "cache invalidation #20181019" > RUN apt-get -y update > RUN apt-get -y install perl-modules > RUN apt-get -y install make > > # Speed up installation > RUN apt-get -y install libmoose-perl > RUN apt-get -y install libpoe-perl > RUN apt-get -y install libpackage-stash-perl libtry-tiny-perl > libdatetime-perl > RUN perl -MCPAN -e 'CPAN::Index->reload' > RUN perl -i -pe 's{.*index_expire.*}{index_expire=>1,}' > /root/.cpan/CPAN/MyConfig.pm > > CMD cpan -t RKITOVER/MooseX-Workers-0.24.tar.gz
Here more information while the test is hanging: * a pstree snippet: | | `-perl,24445 -MExtUtils::Command::MM -MTest::Harness -e undef *Test::Harness::Switches; test_harness(0, 'blib/lib', 'blib/arch') t/00-compile.t t/00.load.t t/01.worker.t t/02.wheel.t t/03.role.t t/10.worker.enqueue.t t/11.worker.job.args.t t/11.worker.job.t t/12.worker.timeout1.t t/13.worker.timeout2.t t/20.worker.SIG.TERM.t t/30.worker.stdout_filter.line.t t/31.worker.stderr_filter.reference.t t/40.worker.stderr_filter.line.t t/41.worker.stderr_filter.reference.t t/50.consolidate.worker.results.t t/60.pass.object.from.child.t t/61.set.max_workers.at.ctor.time.t t/62.set.max_workers.at.run.time.t t/release-pod-syntax.t | | `-perl,24457 t/02.wheel.t | | `-(perl,24458) -> so we have a zombie process here * strace: select(16, [4], [], [], {2720, 265822}) = 0 (Timeout) select(16, [4], [], [], {3599, 999984} -> it seems that select() is waiting for an hour on something from descriptor 4, and continues looping after that * lsof: perl 24457 root 4r FIFO 0,8 0t0 339363272 pipe -> I suspect this pipe is/was connected to the zombie process
Excellent analysis. If you can find dngor somewhere he might take a look at it.
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Dne St 17.říj.2018 15:57:53, SREZIC napsal(a): Show quoted text
> Occasionally t/01.worker.t or t/20.worker.SIG.TERM.t or other test > files may hang. I saw this on various linux and freebsd systems. > Sorry, I have no more information, but I can try to do more debugging > (e.g. create an strace or truss log or so) if it helps.
I'm not sure if it is the same issue, but I experience random hangs in MooseX-Workers-0.24/t/60.pass.object.from.child.t: $ while (perl -Ilib t/60.pass.object.from.child.t); do :; done [...] 1..8 ok 1 - Started with an empty @results array ok 2 - worker started ok 3 - worker finished ^C Contrary t/01.worker.t and t/20.worker.SIG.TERM.t do not hang for me.


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