Mock hangs - why

Thu Aug 17 14:10:59 UTC 2006

On Wed, 2006-08-16 at 17:21 -0700, Al Pacifico wrote:
> I have fifteen CPAN packages that I'm packaging as
> RPMs for FC5, and one (and just one) of them seems to
> hang mock (mock-0.6-4.fc5). All of them check out with
> rpmlint and all build using rpmbuild. All SRPMs except
> 'perl-DBIx-Migration-0.05-1.fc5.src.rpm' build
> flawlessly with mock. 
> 
> But 'mock perl-DBIx-Migration-0.05-1.fc5.src.rpm'
> seems to hang. Adding the --debug option, the screen
> output (and root log) of 'mock
> perl-DBIx-Migration-0.05-1.fc5.src.rpm' ends with:
> 
> Executing /usr/sbin/mock-helper chroot
> /var/lib/mock/fedora-5-i386-core/root /sbin/runuser -
> root -c "cd /;/sbin/runuser -c 'rpmbuild --rebuild
> --target i386 --nodeps
> /builddir/build/SRPMS/perl-DBIx-Migration-0.05-1.fc5.src.rpm'
> mockbuild"
> 
> Then, the command prompt never comes back and when I
> interrupt mock with ctrl-C (I've left my machine
> running mock with this SRPM for over a day, so I don't
> think it's an impatience thing), keystrokes are
> retyped at the console after a long delay and many
> keystrokes, if at all.

Is some process taking up all your CPU?  Is that process part of the
build of your package?

Install and look at the output of the 'pstree' command; that will show
you exactly what mock has launched and the parent/child relationships
between the build processes and mock.  You can also try to 'strace' the
process that seems to be hanging and perhaps get more information out of
it.  Sometimes attaching to the hung build process with gdb shows usable
backtrace info, sometimes not.

In the Extras buildsystem we've had problems with reproducible build
hangs a few times, which were generally solved by updating the kernel.

Dan

> With my other 14 packages, if using the --debug
> option, this command is followed by the usual rpmbuild
> output at this point, the usual mock 'Results and/or
> logs  in: /var/lib/mock/fedora-5-i386-core/result'
> message, and then the command prompt.
> 
> I solicited advice from Jesse Keating who suggested
> trying the mock shell, and what I learned is that 'su
> - mockbuild' prompts for a password even though I'm in
> the chroot'ed shell as 'root'. What is puzzling is
> that this is before trying to rebuild the SRPM, so
> it's not that this package alters the behavior of mock
> (as I had previously thought).
> 
> So, I tried the following (on Jesse's advice):
> [build at powell SRPMS]$ mock init
> init
> clean
> prep
> This may take a while
> ending
> done
> Finished initializing root
> [build at powell SRPMS]$ mock shell
> init
> mock-chroot> id
> uid=0(root) gid=501 groups=101,501
> context=user_u:system_r:unconfined_t:s0
> mock-chroot> su - mockbuild
> Password:
> su: incorrect password
> 
> This leads me to believe that when I try to rebuild
> this SRPM using 'mock
> perl-DBIx-Migration-0.05-1.fc5.src.rpm', mock is
> prompting me for a password for user 'mockbuild' and
> therefore appears to hang.
> 
> I have no idea why this does not happen with the other
> fourteen SRPM's and just with this one or when using
> 'mock shell'.
> 
> Google offered a tantalizing clue on the
> fedora-selinux list (last post in the thread is at
> URL:
> http://listman.redhat.com/archives/fedora-selinux-list/2006-August/msg00073.html)
> which described mock hanging at the same place on
> older versions of Fedora Core, related to older
> versions of selinux.
> 
> Output of rpm -V mock is:
> [build at powell SRPMS]$ rpm -V mock
> S.5....T. c /etc/mock/fedora-5-i386-core.cfg
> [build at powell SRPMS]$
> 
> which is exactly what I'd expect, and other packages
> build fine under mock:
> [build at powell SRPMS]$ mock
> perl-Tie-RegexpHash-0.15-1.src.rpm
> init
> clean
> prep
> This may take a while
> setup
> build
> ending
> done
> Results and/or logs in:
> /var/lib/mock/fedora-5-i386-core/result
> 
> ... so mock is not goofed up.
> 
> My /etc/mock/default.cfg points to a slightly tweaked
> configuration script, which basically just changes the
> repositories to local mirrors. I've attached it to
> this message.
> 
> Couple of questions:
> 1. Can someone check on his/her box that 'su
> mockbuild' from the chroot'ed shell has the same
> behavior and post back?
> 2. Would a mock guru out there have any suggestions?
> -al
> 
> 
> 
> 
> 
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around 
> http://mail.yahoo.com 
> plain text document attachment (fedora-5-i386-core.cfg),
> "1060207214-fedora-5-i386-core.cfg"
> #!/usr/bin/python -tt import os config_opts['root'] = 'fedora-5-i386-core' config_opts['target_arch'] = 'i386' config_opts['yum.conf'] = """ [main] cachedir=/var/cache/yum debuglevel=1 reposdir=/dev/null logfile=/var/log/yum.log retries=20 obsoletes=1 gpgcheck=0 assumeyes=1 # repos [core] name=core #baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$basearch/os/ #mirrorlist=http://fedora.redhat.com/download/mirrors/fedora-core-$releasever baseurl=http://joplin/yum/Fedora/Core/5/base/i386/ enabled=1 #following line for "priorities" yum plug-in.... see http://wiki.centos.org/PackageManagement/Yum/Priorities priority=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora file:///etc/pki/rpm-gpg/RPM-GPG-KEY [updates-released] name=updates #baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/updates/$releasever/$basearch/ #mirrorlist=http://fedora.redhat.com/download/mirrors/updates-released-fc$releasever baseurl=http://joplin/yum/Fedora/Core/5/updates/i386/ enabled=1 #following line for "priorities" yum plug-in.... see http://wiki.centos.org/PackageManagement/Yum/Priorities priority=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora [groups] name=groups baseurl=http://buildsys.fedoraproject.org/buildgroups/5/i386/ [extras] name=extras #baseurl=http://download.fedora.redhat.com/pub/fedora/linux/extras/$releasever/$basearch/ mirrorlist=http://fedora.redhat.com/download/mirrors/fedora-extras-5 enabled=1 #following line for "priorities" yum plug-in.... see http://wiki.centos.org/PackageManagement/Yum/Priorities priority=10 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-extras gpgcheck=1 [pacifico-testing] name=Fedora Core Pacifico testting $releasever - $basearch baseurl=file:///home/build/yum-repo/Fedora/Core/5/pacifico-testing/i386/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/GPG-KEY-apacifico # Name: RPMforge RPM Repository for Fedora Core 5 - i386 # URL: http://rpmforge.net/ [rpmforge] name = Fedora Core 5 - i386 - RPMforge.net - dries #baseurl = http://apt.sw.be/dries/fedora/fc5/$basearch/dries/RPMS mirrorlist = http://apt.sw.be/dries/fedora/fc5/mirrors-rpmforge #mirrorlist = file:///etc/yum.repos.d/mirrors-rpmforge enabled = 1 gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dries gpgcheck = 1 """
> -- Fedora-buildsys-list mailing list Fedora-buildsys-list at redhat.com https://www.redhat.com/mailman/listinfo/fedora-buildsys-list