Public bug reported:
Binary package hint: coreutils
Copied from the attached script that shows how to reproduce the problem:
# If I use parted to create a partition table in a file representing
# a disk image, it should take milliseconds to do. This seems to be
# the case when executing these steps directly:
#
# use losetup (from live-build) to get a /dev/loopN
# attach an empty file to the /dev/loopN
# run a parted script on the empty file to create a partition table
# release the /dev/loopN
#
# However, when executed from within a chroot, this can take multiple
# minutes, specifically when executing the parted step.
#
# Requires:
# -- A normal maverick desktop system
# -- a lucid chroot built and available on that desktop system
# -- "apt-get install live-build parted" in both the maverick
# desktop and the chroot
#
# To show the problem, run this script. First, without a chroot:
# $ sudo ./problem.sh
# then, use a chroot:
# $ sudo ./problem.sh chroot-directory
#
# The first run takes ~100-200 millisec on my system; the second run
# with chroot takes ~6 *minutes*! And, it does not matter whether or
# not /dev is bind-mounted to /dev in the chroot -- either way takes
# about the same amount of time.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: coreutils 8.5-1ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-22.34-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Wed Oct 20 13:21:59 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
PATH=(custom, user)
LANG=en_US.utf8
SHELL=/bin/bash
SourcePackage: coreutils
** Affects: coreutils (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug maverick
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chroot loop devices stall for extremely long periods
https://bugs.launchpad.net/bugs/664115
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