Bug#799857: apt: Low select timeout
Subject: apt: Low select timeout
Package: apt
Version: 1.0.10.2
Severity: wishlist
Dear Maintainer,
> pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
> pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
apt-get seems to use a timeout of 0.5ms for some select call.. Was
this supposed to be 500ms?
0.5ms seems unrealistically low and results in unnecessary CPU usage.
No big problem though. ;)
This happened when hung on Installing new version of config file
/etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf ...
Greetings,
Olaf
-- Package-specific info:
-- apt-config dump --
APT "";
APT::Architecture "i386";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Install-Recommends "1";
APT::Install-Suggests "0";
APT::Authentication "";
APT::Authentication::TrustCDROM "true";
APT::NeverAutoRemove "";
APT::NeverAutoRemove:: "^firmware-linux.*";
APT::NeverAutoRemove:: "^linux-firmware$";
APT::NeverAutoRemove:: "^linux-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-2-686-pae$";
APT::VersionedKernelPackages "";
APT::VersionedKernelPackages:: "linux-image";
APT::VersionedKernelPackages:: "linux-headers";
APT::VersionedKernelPackages:: "linux-image-extra";
APT::VersionedKernelPackages:: "linux-signed-image";
APT::VersionedKernelPackages:: "kfreebsd-image";
APT::VersionedKernelPackages:: "kfreebsd-headers";
APT::VersionedKernelPackages:: "gnumach-image";
APT::VersionedKernelPackages:: ".*-modules";
APT::VersionedKernelPackages:: ".*-kernel";
APT::VersionedKernelPackages:: "linux-backports-modules-.*";
APT::VersionedKernelPackages:: "linux-tools";
APT::Never-MarkAuto-Sections "";
APT::Never-MarkAuto-Sections:: "metapackages";
APT::Never-MarkAuto-Sections:: "restricted/metapackages";
APT::Never-MarkAuto-Sections:: "universe/metapackages";
APT::Never-MarkAuto-Sections:: "multiverse/metapackages";
APT::Never-MarkAuto-Sections:: "oldlibs";
APT::Never-MarkAuto-Sections:: "restricted/oldlibs";
APT::Never-MarkAuto-Sections:: "universe/oldlibs";
[ Wrote 230 lines ]
Report will be sent to "Debian Bug Tracking System" <submit@bugs.debian.org>
Submit this report on apt (e to edit) [Y|n|a|c|e|i|l|m|p|q|d|t|s|?]?
Bug report written as /var/tmp/apt.bug
If you want to provide additional information, please wait to receive
the bug tracking number via email; you may then send any extra
information to n@bugs.debian.org (e.g.
999999@bugs.debian.org), where n is the bug number. Normally you will
receive an acknowledgement via email including the bug report number
within an hour; if you haven't received a confirmation,
then the bug reporting process failed at some point (reportbug or MTA
failure, BTS maintenance, etc.).
olaf@unstable:~$ cat /var/tmp/apt.bug
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Olaf van der Spek <olaf@unstable>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: apt: Low select timeout
Message-ID: <20150923105620.15397.70969.reportbug@unstable>
X-Mailer: reportbug 6.6.5
Date: Wed, 23 Sep 2015 12:56:20 +0200
Package: apt
Version: 1.0.10.2
Severity: wishlist
Dear Maintainer,
> pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
> pselect6(19, [0 16 18], NULL, NULL, {0, 500000}, {[], 8}) = 0 (Timeout)
> waitpid(14977, 0xbfbc03d4, WNOHANG) = 0
apt-get seems to use a timeout of 0.5ms for some select call.. Was
this supposed to be 500ms?
0.5ms seems unrealistically low and results in unnecessary CPU usage.
No big problem though. ;)
This happened when hung on Installing new version of config file
/etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf ...
Greetings,
Olaf
-- Package-specific info:
-- apt-config dump --
APT "";
APT::Architecture "i386";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Install-Recommends "1";
APT::Install-Suggests "0";
APT::Authentication "";
APT::Authentication::TrustCDROM "true";
APT::NeverAutoRemove "";
APT::NeverAutoRemove:: "^firmware-linux.*";
APT::NeverAutoRemove:: "^linux-firmware$";
APT::NeverAutoRemove:: "^linux-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-headers-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^gnumach-image-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^.*-modules-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^.*-kernel-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.1\.0-2-686-pae$";
APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-1-686-pae$";
APT::NeverAutoRemove:: "^linux-tools-4\.1\.0-2-686-pae$";
APT::VersionedKernelPackages "";
APT::VersionedKernelPackages:: "linux-image";
APT::VersionedKernelPackages:: "linux-headers";
APT::VersionedKernelPackages:: "linux-image-extra";
APT::VersionedKernelPackages:: "linux-signed-image";
APT::VersionedKernelPackages:: "kfreebsd-image";
APT::VersionedKernelPackages:: "kfreebsd-headers";
APT::VersionedKernelPackages:: "gnumach-image";
APT::VersionedKernelPackages:: ".*-modules";
APT::VersionedKernelPackages:: ".*-kernel";
APT::VersionedKernelPackages:: "linux-backports-modules-.*";
APT::VersionedKernelPackages:: "linux-tools";
APT::Never-MarkAuto-Sections "";
APT::Never-MarkAuto-Sections:: "metapackages";
APT::Never-MarkAuto-Sections:: "restricted/metapackages";
APT::Never-MarkAuto-Sections:: "universe/metapackages";
APT::Never-MarkAuto-Sections:: "multiverse/metapackages";
APT::Never-MarkAuto-Sections:: "oldlibs";
APT::Never-MarkAuto-Sections:: "restricted/oldlibs";
APT::Never-MarkAuto-Sections:: "universe/oldlibs";
APT::Never-MarkAuto-Sections:: "multiverse/oldlibs";
APT::Architectures "";
APT::Architectures:: "i386";
APT::Compressor "";
APT::Compressor::. "";
APT::Compressor::.::Name ".";
APT::Compressor::.::Extension "";
APT::Compressor::.::Binary "";
APT::Compressor::.::Cost "1";
APT::Compressor::gzip "";
APT::Compressor::gzip::Name "gzip";
APT::Compressor::gzip::Extension ".gz";
APT::Compressor::gzip::Binary "gzip";
APT::Compressor::gzip::Cost "2";
APT::Compressor::gzip::CompressArg "";
APT::Compressor::gzip::CompressArg:: "-9n";
APT::Compressor::gzip::UncompressArg "";
APT::Compressor::gzip::UncompressArg:: "-d";
APT::Compressor::bzip2 "";
APT::Compressor::bzip2::Name "bzip2";
APT::Compressor::bzip2::Extension ".bz2";
APT::Compressor::bzip2::Binary "bzip2";
APT::Compressor::bzip2::Cost "3";
APT::Compressor::bzip2::CompressArg "";
APT::Compressor::bzip2::CompressArg:: "-9";
APT::Compressor::bzip2::UncompressArg "";
APT::Compressor::bzip2::UncompressArg:: "-d";
APT::Compressor::xz "";
APT::Compressor::xz::Name "xz";
APT::Compressor::xz::Extension ".xz";
APT::Compressor::xz::Binary "xz";
APT::Compressor::xz::Cost "4";
APT::Compressor::xz::CompressArg "";
APT::Compressor::xz::CompressArg:: "-6";
APT::Compressor::xz::UncompressArg "";
APT::Compressor::xz::UncompressArg:: "-d";
APT::Compressor::lzma "";
APT::Compressor::lzma::Name "lzma";
APT::Compressor::lzma::Extension ".lzma";
APT::Compressor::lzma::Binary "xz";
APT::Compressor::lzma::Cost "5";
APT::Compressor::lzma::CompressArg "";
APT::Compressor::lzma::CompressArg:: "--format=lzma";
APT::Compressor::lzma::CompressArg:: "-9";
APT::Compressor::lzma::UncompressArg "";
APT::Compressor::lzma::UncompressArg:: "--format=lzma";
APT::Compressor::lzma::UncompressArg:: "-d";
Dir "/";
Dir::State "var/lib/apt/";
Dir::State::lists "lists/";
Dir::State::cdroms "cdroms.list";
Dir::State::mirrors "mirrors/";
Dir::State::extended_states "extended_states";
Dir::State::status "/var/lib/dpkg/status";
Dir::Cache "var/cache/apt/";
Dir::Cache::archives "archives/";
Dir::Cache::srcpkgcache "srcpkgcache.bin";
Dir::Cache::pkgcache "pkgcache.bin";
Dir::Etc "etc/apt/";
Dir::Etc::sourcelist "sources.list";
Dir::Etc::sourceparts "sources.list.d";
Dir::Etc::vendorlist "vendors.list";
Dir::Etc::vendorparts "vendors.list.d";
Dir::Etc::main "apt.conf";
Dir::Etc::netrc "auth.conf";
Dir::Etc::parts "apt.conf.d";
Dir::Etc::preferences "preferences";
Dir::Etc::preferencesparts "preferences.d";
Dir::Etc::trusted "trusted.gpg";
Dir::Etc::trustedparts "trusted.gpg.d";
Dir::Bin "";
Dir::Bin::methods "/usr/lib/apt/methods";
Dir::Bin::solvers "";
Dir::Bin::solvers:: "/usr/lib/apt/solvers";
Dir::Bin::dpkg "/usr/bin/dpkg";
Dir::Bin::bzip2 "/bin/bzip2";
Dir::Bin::xz "/usr/bin/xz";
Dir::Bin::lzma "/usr/bin/xz";
Dir::Media "";
Dir::Media::MountPath "/media/cdrom";
Dir::Log "var/log/apt";
Dir::Log::Terminal "term.log";
Dir::Log::History "history.log";
Dir::Ignore-Files-Silently "";
Dir::Ignore-Files-Silently:: "~$";
Dir::Ignore-Files-Silently:: "\.disabled$";
Dir::Ignore-Files-Silently:: "\.bak$";
Dir::Ignore-Files-Silently:: "\.dpkg-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.save$";
Dir::Ignore-Files-Silently:: "\.orig$";
Dir::Ignore-Files-Silently:: "\.distUpgrade$";
Acquire "";
Acquire::cdrom "";
Acquire::cdrom::mount "/media/cdrom";
Acquire::Languages "";
Acquire::Languages:: "en";
Acquire::Languages:: "none";
Aptitude "";
Aptitude::Get-Root-Command "sudo:/usr/bin/sudo";
DPkg "";
DPkg::Pre-Install-Pkgs "";
DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
CommandLine "";
CommandLine::AsString "apt-config dump";
-- (no /etc/apt/preferences present) --
-- /etc/apt/sources.list --
deb http://ftp.nl.debian.org/debian/ unstable main
deb-src http://ftp.nl.debian.org/debian/ jessie main
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main
# jessie-updates, previously known as 'volatile'
deb http://ftp.nl.debian.org/debian/ jessie-updates main
deb-src http://ftp.nl.debian.org/debian/ jessie-updates main
# jessie-backports, previously on backports.debian.org
deb http://ftp.nl.debian.org/debian/ jessie-backports main
deb-src http://ftp.nl.debian.org/debian/ jessie-backports main
-- System Information:
Debian Release: stretch/sid
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 4.1.0-2-686-pae (SMP w/3 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages apt depends on:
ii debian-archive-keyring 2014.3
ii gnupg 1.4.19-5
ii libapt-pkg4.16 1.0.10.2
ii libc6 2.19-22
ii libgcc1 1:5.2.1-17
ii libstdc++6 5.2.1-17
apt recommends no packages.
Versions of packages apt suggests:
pn apt-doc <none>
pn aptitude | synaptic | wajig <none>
pn dpkg-dev <none>
ii python-apt 1.0.0
-- no debconf information
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