Oddly hanging mock build

[Jason L Tibbitts III]

I'm not sure what to make of this so I haven't yet filed a bug.  But I
noticed that one of spot's jobs was taking way longer than it should:
  http://koji.fedoraproject.org/koji/buildinfo?buildID=31678
and so I grabbed the srpm and tried to build it on my local builder.
It hung at the same place that spot's job was hung.

Basically mock installs dependencies, then calls rpmbuild and stops:

mock.util: Installed: ccache.x86_64 0:2.4-11.fc8 perl-DBI.x86_64 0:1.601-1.fc9 sqlite-devel.x86_64 0:3.5.4-2.fc9
mock.util: Dependency Installed: perl-ExtUtils-Embed.x86_64 0:1.26-31.fc9 perl-ExtUtils-MakeMaker.x86_64 0:6.30-31.fc9 perl-Test-Harness.x86_64 0:2.56-31.fc9 perl-devel.x86_64 4:5.8.8-31.fc9
mock.Root.state: State Changed: build
mock.util: run cmd timeout(0): ccache -M 4G
mock.util: Ran setarch 'x86_64'
mock.util: chroot /mock/fedora-development-x86_64/root/
mock.Root.build: ENTER do("bash -l -c 'rpmbuild -bb --target x86_64 --nodeps //builddir/build/SPECS/perl-DBD-SQLite.spec'", '/mock/fedora-development-x86_64/root/', 0, True, 0, <mock.uid.uidManager object at 0x90e210>, 7225, 493, 'x86_64', logger=<mock.trace_decorator.getLog object at 0x90e990>)
mock.Root.build: run cmd timeout(0): bash -l -c 'rpmbuild -bb --target x86_64 --nodeps //builddir/build/SPECS/perl-DBD-SQLite.spec'
mock.util: Ran setarch 'x86_64'
mock.util: chroot /mock/fedora-development-x86_64/root/
mock.util: elevate privs to run chroot
mock.util: back to other privs
mock.util: about to drop privs

There's no further output.

 - J<