Debian Bug report logs - #715494
apt-pkg: out-of-date pkgcache.bin: /var/lib/dpkg/status updated more than once in one second

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Package: apt; Maintainer for apt is APT Development Team <[email protected]>; Source for apt is src:apt (PTS, buildd, popcon).

Reported by: Philipp Hahn <[email protected]>

Date: Tue, 9 Jul 2013 17:15:02 UTC

Severity: normal

Found in version apt/0.8.10

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Subject: Bug#715494: apt-pkg: out-of-date pkgcache.bin: /var/lib/dpkg/status updated more than once in one second
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From: Philipp Hahn <[email protected]>
To: Debian Bug Tracking System <[email protected]>
Message-ID: <[email protected]>
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Date: Tue, 09 Jul 2013 19:05:23 +0200
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Package: apt
Version: 0.8.10
Severity: normal

Dear Maintainer,

we (Univention GmbH) provide a Debian based distribution called "UCS".
During automatic testing we noticed a suitable bug in APT:

If /var/lib/dpkg/status is updated more than once in one second, apt-pkg
does not detect that and does not update its /var/cache/apt/pkgcache.bin
file.
"dpkg-query -W" and "apt-cache policy" then display different versions
for the currently installed version.

I tracked it down to apt-pkg/pkgcache.cc and apt-pkg/deb/debindexfile.cc
only using 'stat.mtime' without the nano-second resolution in 'tv_nsec',
which more modern Linux kernels do provide.

Would you accept a patch which adds (conditional) support for that, or
do you prefer a different solution.


The bug is more likely to happen on fast machines and in virtual
machines, where the expensive disk sync get filtered out.

The full bug information is available in our public Bugzilla at
<https://forge.univention.org/bugzilla/show_bug.cgi?id=31773>

Sincerely
Philipp Hahn <[email protected]>
-- Package-specific info:

-- System Information:
Debian Release: 7.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages apt depends on:
ii  debian-archive-keyring  2012.4
ii  gnupg                   1.4.12-7
ii  libapt-pkg4.12          0.9.7.9
ii  libc6                   2.13-38
ii  libgcc1                 1:4.7.2-5
ii  libstdc++6              4.7.2-5

apt recommends no packages.

Versions of packages apt suggests:
pn  apt-doc     <none>
ii  aptitude    0.6.8.2-1
ii  dpkg-dev    1.16.10
ii  python-apt  0.8.8.2
ii  xz-utils    5.1.1alpha+20120614-2

-- no debconf information

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