Mock hangs - why

[Al Pacifico]

>
> Date: Thu, 17 Aug 2006 10:10:59 -0400
> From: Dan Williams <dcbw at redhat.com>
> Subject: Re: Mock hangs - why
> To: Discussion of Fedora build system
> 	<fedora-buildsys-list at redhat.com>
> Message-ID:
> <1155823859.2665.21.camel at localhost.localdomain>
> Content-Type: text/plain
> 
> On Wed, 2006-08-16 at 17:21 -0700, Al Pacifico
> wrote:
<snip>
> > 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
> 

Dan-
I don't think that is the problem. At present, mock is
hung (as described above) and 'pstree build' yields:
bash───mock───sh───runuser───bash───runuser───rpmbuild───sh───perl
and 'uptime' yields:
 16:30:20 up  7:54,  3 users,  load average: 0.00,
0.00, 0.00

At present, I'm starting to work on strace... I need
to carefully review that thread on fedora-selinux list
to see how Paul Howarth limited strace to the command
in question or else I'll likely be overwhelmed by the
output of 'strace mock <culprit-SRPM>'.

<snip>

> Date: Thu, 17 Aug 2006 10:36:58 -0500
> From: Clark Williams <williams at redhat.com>
> Subject: Re: Mock hangs - why
> To: Discussion of Fedora build system
> 	<fedora-buildsys-list at redhat.com>
> Message-ID: <44E48D1A.2070202 at redhat.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Dan Williams wrote:

<snip>

> > In the Extras buildsystem we've had problems with
> reproducible build
> > hangs a few times, which were generally solved by
> updating the kernel.
> > 
> 
> What kernel are you running on the build system?
> 
Clark-
Reproducible with kernel-smp.i686 2.6.17-1.2157_FC5
and  kernel-smp.i686 2.6.17-1.2174_FC5. I updated to
2174 this morning after reading what Dan wrote.

I'm still wondering if the password prompt following
'su' after executing 'mock shell' gives the same
behavior on others' systems... and if not, which
kernel they are running (might help pinpoint the
problem).
-al

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