Bug#1106576: apt: use of snapshot date with grml repo leads to IOT instruction (core dumped)

Package: apt
Version: 3.0.1
Severity: important

Beloved apt maintainers,

the use of --snapshot will fail with the grml repo as the default
handling is "Snapshot: enable" unless disabled.
This won't happen if you use the provided deb822.sources from
grml-keyring as this was disabled by me
(https://github.com/grml/grml-keyring/pull/22). But as this error can still
be reproduced and IIRC it doesn't explicitely have to be grml so it would
still be a good idea to fix it.

How to break apt:
---
root@trixie ~ # apt-get install grml-keyring
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
  grml-keyring
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/8448 B of archives.
After this operation, 26.6 kB of additional disk space will be used.
Selecting previously unselected package grml-keyring.
(Reading database ... 36134 files and directories currently installed.)
Preparing to unpack .../grml-keyring_2025.03.11_all.deb ...
Unpacking grml-keyring (2025.03.11) ...
Setting up grml-keyring (2025.03.11) ...
root@trixie ~ # sed 's/^Sna/#&/' /usr/share/grml-keyring/grml.sources > /etc/apt/sources.list.d/grml.sources
100 root@trixie ~ # sed 's/^Sna/#&/' /usr/share/grml-keyring/grml.sources > /etc/apt/sources.list.d/grml.sources
root@trixie ~ # apt-get --snapshot `date +%Y%m%d -d'last week'` update
apt-get: ./apt-pkg/deb/debmetaindex.cc:1352: bool debSLTypeDebian::CreateItemInternal(std::vector<metaIndex*>&, std::string, const std::string&, const std::string&, const bool&, std::map<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >) const: Assertion `List.back() == Deb' failed.
[1]    56252 IOT instruction (core dumped)  apt-get --snapshot `date +%Y%m%d -d'last week'` update
---

o/
Christopher Bock

-- Package-specific info:

-- apt-config dump --

APT "";
APT::Architecture "amd64";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Install-Recommends "1";
APT::Install-Suggests "0";
APT::Key "";
APT::Key::Assert-Pubkey-Algo ">=rsa2048,ed25519,ed448,nistp256,nistp384,nistp512,brainpoolP256r1,brainpoolP320r1,brainpoolP384r1,brainpoolP512r1,secp256k1";
APT::Key::Assert-Pubkey-Algo::Next ">=rsa2048,ed25519,ed448,nistp256,nistp384,nistp512";
APT::Key::Assert-Pubkey-Algo::Future ">=rsa3072,ed25519,ed448";
APT::Sandbox "";
APT::Sandbox::User "_apt";
APT::NeverAutoRemove "";
APT::NeverAutoRemove:: "^firmware-linux.*";
APT::NeverAutoRemove:: "^linux-firmware$";
APT::NeverAutoRemove:: "^linux-image-[a-z0-9]*$";
APT::NeverAutoRemove:: "^linux-image-[a-z0-9]*-[a-z0-9]*$";
APT::VersionedKernelPackages "";
APT::VersionedKernelPackages:: "linux-.*";
APT::VersionedKernelPackages:: "kfreebsd-.*";
APT::VersionedKernelPackages:: "gnumach-.*";
APT::VersionedKernelPackages:: ".*-modules";
APT::VersionedKernelPackages:: ".*-kernel";
APT::Never-MarkAuto-Sections "";
APT::Never-MarkAuto-Sections:: "metapackages";
APT::Never-MarkAuto-Sections:: "tasks";
APT::Move-Autobit-Sections "";
APT::Move-Autobit-Sections:: "oldlibs";
APT::Periodic "";
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";
APT::Architectures "";
APT::Architectures:: "amd64";
APT::Compressor "";
APT::Compressor::. "";
APT::Compressor::.::Name ".";
APT::Compressor::.::Extension "";
APT::Compressor::.::Binary "";
APT::Compressor::.::Cost "0";
APT::Compressor::zstd "";
APT::Compressor::zstd::Name "zstd";
APT::Compressor::zstd::Extension ".zst";
APT::Compressor::zstd::Binary "zstd";
APT::Compressor::zstd::Cost "60";
APT::Compressor::zstd::CompressArg "";
APT::Compressor::zstd::CompressArg:: "-6";
APT::Compressor::zstd::UncompressArg "";
APT::Compressor::zstd::UncompressArg:: "-d";
APT::Compressor::lz4 "";
APT::Compressor::lz4::Name "lz4";
APT::Compressor::lz4::Extension ".lz4";
APT::Compressor::lz4::Binary "false";
APT::Compressor::lz4::Cost "50";
APT::Compressor::gzip "";
APT::Compressor::gzip::Name "gzip";
APT::Compressor::gzip::Extension ".gz";
APT::Compressor::gzip::Binary "gzip";
APT::Compressor::gzip::Cost "100";
APT::Compressor::gzip::CompressArg "";
APT::Compressor::gzip::CompressArg:: "-6n";
APT::Compressor::gzip::UncompressArg "";
APT::Compressor::gzip::UncompressArg:: "-d";
APT::Compressor::xz "";
APT::Compressor::xz::Name "xz";
APT::Compressor::xz::Extension ".xz";
APT::Compressor::xz::Binary "xz";
APT::Compressor::xz::Cost "200";
APT::Compressor::xz::CompressArg "";
APT::Compressor::xz::CompressArg:: "-6";
APT::Compressor::xz::UncompressArg "";
APT::Compressor::xz::UncompressArg:: "-d";
APT::Compressor::bzip2 "";
APT::Compressor::bzip2::Name "bzip2";
APT::Compressor::bzip2::Extension ".bz2";
APT::Compressor::bzip2::Binary "false";
APT::Compressor::bzip2::Cost "300";
APT::Compressor::lzma "";
APT::Compressor::lzma::Name "lzma";
APT::Compressor::lzma::Extension ".lzma";
APT::Compressor::lzma::Binary "xz";
APT::Compressor::lzma::Cost "400";
APT::Compressor::lzma::CompressArg "";
APT::Compressor::lzma::CompressArg:: "--format=lzma";
APT::Compressor::lzma::CompressArg:: "-6";
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::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::main "apt.conf";
Dir::Etc::netrc "auth.conf";
Dir::Etc::netrcparts "auth.conf.d";
Dir::Etc::parts "apt.conf.d";
Dir::Etc::preferences "preferences";
Dir::Etc::preferencesparts "preferences.d";
Dir::Etc::trustedparts "trusted.gpg.d";
Dir::Etc::apt-listchanges-main "listchanges.conf";
Dir::Etc::apt-listchanges-parts "listchanges.conf.d";
Dir::Boot "boot";
Dir::Usr "usr";
Dir::Bin "";
Dir::Bin::methods "/usr/lib/apt/methods";
Dir::Bin::solvers "";
Dir::Bin::solvers:: "/usr/lib/apt/solvers";
Dir::Bin::planners "";
Dir::Bin::planners:: "/usr/lib/apt/planners";
Dir::Bin::dpkg "/usr/bin/dpkg";
Dir::Bin::gzip "/bin/gzip";
Dir::Bin::bzip2 "/bin/bzip2";
Dir::Bin::xz "/usr/bin/xz";
Dir::Bin::lz4 "/usr/bin/lz4";
Dir::Bin::zstd "/usr/bin/zstd";
Dir::Bin::lzma "/usr/bin/xz";
Dir::Media "";
Dir::Media::MountPath "/media/apt";
Dir::Log "var/log/apt";
Dir::Log::Terminal "term.log";
Dir::Log::History "history.log";
Dir::Log::Planner "eipp.log.xz";
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]+$";
Dir::Ignore-Files-Silently:: "\.ucf-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.save$";
Dir::Ignore-Files-Silently:: "\.orig$";
Dir::Ignore-Files-Silently:: "\.distUpgrade$";
Acquire "";
Acquire::AllowInsecureRepositories "0";
Acquire::AllowWeakRepositories "0";
Acquire::AllowDowngradeToInsecureRepositories "0";
Acquire::cdrom "";
Acquire::cdrom::mount "/media/cdrom/";
Acquire::IndexTargets "";
Acquire::IndexTargets::deb "";
Acquire::IndexTargets::deb::Packages "";
Acquire::IndexTargets::deb::Packages::MetaKey "$(COMPONENT)/binary-$(ARCHITECTURE)/Packages";
Acquire::IndexTargets::deb::Packages::flatMetaKey "Packages";
Acquire::IndexTargets::deb::Packages::ShortDescription "Packages";
Acquire::IndexTargets::deb::Packages::Description "$(RELEASE)/$(COMPONENT) $(ARCHITECTURE) Packages";
Acquire::IndexTargets::deb::Packages::flatDescription "$(RELEASE) Packages";
Acquire::IndexTargets::deb::Packages::Optional "0";
Acquire::IndexTargets::deb::Translations "";
Acquire::IndexTargets::deb::Translations::MetaKey "$(COMPONENT)/i18n/Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::flatMetaKey "$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::ShortDescription "Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::Description "$(RELEASE)/$(COMPONENT) Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::flatDescription "$(RELEASE) Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb-src "";
Acquire::IndexTargets::deb-src::Sources "";
Acquire::IndexTargets::deb-src::Sources::MetaKey "$(COMPONENT)/source/Sources";
Acquire::IndexTargets::deb-src::Sources::flatMetaKey "Sources";
Acquire::IndexTargets::deb-src::Sources::ShortDescription "Sources";
Acquire::IndexTargets::deb-src::Sources::Description "$(RELEASE)/$(COMPONENT) Sources";
Acquire::IndexTargets::deb-src::Sources::flatDescription "$(RELEASE) Sources";
Acquire::IndexTargets::deb-src::Sources::Optional "0";
Acquire::Changelogs "";
Acquire::Changelogs::URI "";
Acquire::Changelogs::URI::Origin "";
Acquire::Changelogs::URI::Origin::Debian "https://metadata.ftp-master.debian.org/changelogs/@CHANGEPATH@_changelog";
Acquire::Changelogs::URI::Origin::Ubuntu "https://changelogs.ubuntu.com/changelogs/pool/@CHANGEPATH@/changelog";
Acquire::Changelogs::AlwaysOnline "";
Acquire::Changelogs::AlwaysOnline::Origin "";
Acquire::Changelogs::AlwaysOnline::Origin::Ubuntu "1";
Acquire::Snapshots "";
Acquire::Snapshots::URI "";
Acquire::Snapshots::URI::Origin "";
Acquire::Snapshots::URI::Origin::Debian "https://snapshot.debian.org/archive/debian/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Origin::Ubuntu "https://snapshot.ubuntu.com/ubuntu/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Override "";
Acquire::Snapshots::URI::Override::Label "";
Acquire::Snapshots::URI::Override::Label::Debian-Security "https://snapshot.debian.org/archive/debian-security/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Host "";
Acquire::Snapshots::URI::Host::archive.ubuntu.com "https://snapshot.ubuntu.com/@PATH@/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Host::deb.debian.org "https://snapshot.debian.org/archive/@PATH@/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Host::.archive.ubuntu.com "https://snapshot.ubuntu.com/@PATH@/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Host::security.ubuntu.com "https://snapshot.ubuntu.com/@PATH@/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Host::ppa.launchpadcontent.net "https://snapshot.ppa.launchpadcontent.net/@PATH@/@SNAPSHOTID@/";
Acquire::Snapshots::URI::Host::ppa.launchpad.net "https://snapshot.ppa.launchpadcontent.net/@PATH@/@SNAPSHOTID@/";
Acquire::http "";
Acquire::http::Proxy-Auto-Detect "/usr/bin/auto-apt-proxy";
Acquire::Languages "";
Acquire::Languages:: "en";
Acquire::Languages:: "none";
Acquire::CompressionTypes "";
Acquire::CompressionTypes::xz "xz";
Acquire::CompressionTypes::bz2 "bzip2";
Acquire::CompressionTypes::lzma "lzma";
Acquire::CompressionTypes::gz "gzip";
Acquire::CompressionTypes::lz4 "lz4";
Acquire::CompressionTypes::zst "zstd";
DPkg "";
DPkg::Path "/usr/sbin:/usr/bin:/sbin:/bin";
DPkg::Pre-Install-Pkgs "";
DPkg::Pre-Install-Pkgs:: "/usr/bin/apt-listchanges --apt || test $? -lt 10";
DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
DPkg::Tools "";
DPkg::Tools::Options "";
DPkg::Tools::Options::/usr/bin/apt-listchanges "";
DPkg::Tools::Options::/usr/bin/apt-listchanges::Version "2";
DPkg::Tools::Options::/usr/bin/apt-listchanges::InfoFD "20";
Unattended-Upgrade "";
Unattended-Upgrade::Origins-Pattern "";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename},label=Debian";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename},label=Debian-Security";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename}-security,label=Debian-Security";
auto-apt-proxy "";
auto-apt-proxy::Debug "no";
Binary "apt-config";
Binary::apt-cdrom "";
Binary::apt-cdrom::APT "";
Binary::apt-cdrom::APT::Internal "";
Binary::apt-cdrom::APT::Internal::OpProgress "";
Binary::apt-cdrom::APT::Internal::OpProgress::EraseLines "0";
Binary::apt "";
Binary::apt::APT "";
Binary::apt::APT::Color "1";
Binary::apt::APT::Output-Version "30";
Binary::apt::APT::Cache "";
Binary::apt::APT::Cache::Show "";
Binary::apt::APT::Cache::Show::Version "2";
Binary::apt::APT::Cache::AllVersions "0";
Binary::apt::APT::Cache::ShowVirtuals "1";
Binary::apt::APT::Cache::Search "";
Binary::apt::APT::Cache::Search::Version "2";
Binary::apt::APT::Cache::ShowDependencyType "1";
Binary::apt::APT::Cache::ShowVersion "1";
Binary::apt::APT::Get "";
Binary::apt::APT::Get::Upgrade-Allow-New "1";
Binary::apt::APT::Get::Update "";
Binary::apt::APT::Get::Update::InteractiveReleaseInfoChanges "1";
Binary::apt::APT::Cmd "";
Binary::apt::APT::Cmd::Show-Update-Stats "1";
Binary::apt::APT::Cmd::Pattern-Only "1";
Binary::apt::APT::Keep-Downloaded-Packages "0";
Binary::apt::DPkg "";
Binary::apt::DPkg::Progress-Fancy "1";
Binary::apt::DPkg::Lock "";
Binary::apt::DPkg::Lock::Timeout "-1";
Binary::apt::Pager "1";
CommandLine "";
CommandLine::AsString "apt-config dump";

-- (no /etc/apt/preferences present) --


-- (no /etc/apt/preferences.d/* present) --


-- /etc/apt/sources.list --

# See /etc/apt/sources.list.d/debian.sources

-- /etc/apt/sources.list.d/debian.sources --

Types: deb deb-src
URIs: http://deb.debian.org/debian
#URIs: mirror+file:///etc/apt/mirrors/debian.list
Suites: trixie trixie-updates trixie-backports
Snapshot: enable
Components: main
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg

Types: deb deb-src
URIs: http://deb.debian.org/debian-security
#URIs: mirror+file:///etc/apt/mirrors/debian-security.list
Suites: trixie-security
Snapshot: enable
Components: main
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg

-- /etc/apt/sources.list.d/grml.sources --

Types: deb deb-src
URIs: http://deb.grml.org
Suites: grml-stable grml-testing
Components: main
Enabled: yes
#Snapshot: disable
Signed-By: /usr/share/keyrings/grml-archive-keyring.pgp

-- System Information:
Debian Release: 13.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.27-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages apt depends on:
ii  adduser                 3.152
ii  base-passwd             3.6.7
ii  debian-archive-keyring  2025.1
ii  libapt-pkg7.0           3.0.1
ii  libc6                   2.41-8
ii  libgcc-s1               14.2.0-19
ii  libseccomp2             2.6.0-2
ii  libssl3t64              3.5.0-1
ii  libstdc++6              14.2.0-19
ii  libsystemd0             257.5-2
ii  sqv                     1.3.0-2

Versions of packages apt recommends:
ii  ca-certificates  20250419

Versions of packages apt suggests:
pn  apt-doc                      <none>
pn  aptitude | synaptic | wajig  <none>
pn  dpkg-dev                     <none>
pn  gnupg | gnupg2 | gnupg1      <none>
pn  powermgmt-base               <none>

-- no debconf information