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systemd package

  1. Bug #1846787
  2. Activity log

Activity log for bug #1846787

Date Who What changed Old value New value Message
2019-10-04 15:50:27 Heitor Alves de Siqueira bug added bug
2019-10-04 15:51:12 Heitor Alves de Siqueira bug task added dbus (Ubuntu)
2019-10-04 15:51:23 Heitor Alves de Siqueira nominated for series Ubuntu Xenial
2019-10-04 15:51:23 Heitor Alves de Siqueira bug task added dbus (Ubuntu Xenial)
2019-10-04 15:51:23 Heitor Alves de Siqueira bug task added systemd (Ubuntu Xenial)
2019-10-04 15:51:35 Heitor Alves de Siqueira dbus (Ubuntu): status New Fix Released
2019-10-04 15:51:36 Heitor Alves de Siqueira systemd (Ubuntu): status New Fix Released
2019-10-04 15:51:47 Heitor Alves de Siqueira dbus (Ubuntu Xenial): assignee Heitor Alves de Siqueira (halves)
2019-10-04 15:51:49 Heitor Alves de Siqueira systemd (Ubuntu Xenial): assignee Heitor Alves de Siqueira (halves)
2019-10-04 15:52:56 Heitor Alves de Siqueira description [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) - tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere (fc2fffe7706e) - journald: stack allocation cannot fail (23be5709e10b) $ git describe --contains d8fdc62037b5 fc2fffe7706e 23be5709e10b v230~71^2~2 v230~71^2~1 v230~71^2 $ rmadison systemd systemd | 229-4ubuntu4 | xenial | source, ... systemd | 229-4ubuntu21.21 | xenial-security | source, ... systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <-------- systemd | 237-3ubuntu10 | bionic | source, ... systemd | 237-3ubuntu10.29 | bionic-security | source, ... systemd | 237-3ubuntu10.29 | bionic-updates | source, ... systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus dbus | 1.10.6-1ubuntu3 | xenial | source, ... dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ... dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <-------- dbus | 1.12.2-1ubuntu1 | bionic | source, ... dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ... dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 > /dev/null & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions. [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) - tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere (fc2fffe7706e) - journald: stack allocation cannot fail (23be5709e10b) $ git describe --contains d8fdc62037b5 fc2fffe7706e 23be5709e10b v230~71^2~2 v230~71^2~1 v230~71^2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 > /dev/null & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions.
2019-10-07 11:35:15 Heitor Alves de Siqueira dbus (Ubuntu Xenial): status New In Progress
2019-10-07 11:35:16 Heitor Alves de Siqueira systemd (Ubuntu Xenial): status New In Progress
2019-10-07 11:36:01 Heitor Alves de Siqueira description [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) - tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere (fc2fffe7706e) - journald: stack allocation cannot fail (23be5709e10b) $ git describe --contains d8fdc62037b5 fc2fffe7706e 23be5709e10b v230~71^2~2 v230~71^2~1 v230~71^2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 > /dev/null & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions. [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) - tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere (fc2fffe7706e) - journald: stack allocation cannot fail (23be5709e10b) $ git describe --contains d8fdc62037b5 fc2fffe7706e 23be5709e10b v230~71^2~2 v230~71^2~1 v230~71^2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions.
2019-10-07 11:48:04 Heitor Alves de Siqueira description [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) - tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere (fc2fffe7706e) - journald: stack allocation cannot fail (23be5709e10b) $ git describe --contains d8fdc62037b5 fc2fffe7706e 23be5709e10b v230~71^2~2 v230~71^2~1 v230~71^2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions. [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) $ git describe --contains d8fdc62037b5 v230~71^2~2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions.
2019-10-07 11:48:43 Heitor Alves de Siqueira tags sts sts sts-sponsor
2019-10-07 11:48:55 Heitor Alves de Siqueira bug added subscriber STS Sponsors
2019-10-07 11:49:25 Heitor Alves de Siqueira attachment added lp1846787-dbus-xenial.debdiff https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1846787/+attachment/5295136/+files/lp1846787-dbus-xenial.debdiff
2019-10-07 11:49:43 Heitor Alves de Siqueira attachment added lp1846787-systemd-xenial.debdiff https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1846787/+attachment/5295137/+files/lp1846787-systemd-xenial.debdiff
2019-10-07 13:11:03 Heitor Alves de Siqueira description [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) $ git describe --contains d8fdc62037b5 v230~71^2~2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] The regression potential is low, as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions. [Impact] Scope file leakage can cause SSH delays and reduce performance in systemd [Description] The current systemd-logind version present in Xenial can leave abandoned SSH sessions and scope files in cases where the host sees a lot of concurrent SSH connections. These leftover sessions can slow down systemd performance greatly, and can have an impact on sshd handling a great number of concurrent connections. To fix this issue, patches are needed in both dbus and systemd. These improve the performance of the communication between dbus and systemd, so that they can handle a better volume of events (e.g. SSH logins). All of those patches are already present from Bionic onwards, so we only need those fixes for Xenial. == Systemd == Upstream patches: - core: use an AF_UNIX/SOCK_DGRAM socket for cgroup agent notification (d8fdc62037b5) $ git describe --contains d8fdc62037b5 v230~71^2~2 $ rmadison systemd  systemd | 229-4ubuntu4 | xenial | source, ...  systemd | 229-4ubuntu21.21 | xenial-security | source, ...  systemd | 229-4ubuntu21.22 | xenial-updates | source, ... <--------  systemd | 237-3ubuntu10 | bionic | source, ...  systemd | 237-3ubuntu10.29 | bionic-security | source, ...  systemd | 237-3ubuntu10.29 | bionic-updates | source, ...  systemd | 237-3ubuntu10.31 | bionic-proposed | source, ... == DBus == Upstream patches: - Only read one message at a time if there are fds pending (892f084eeda0) - bus: Fix timeout restarts (529600397bca) - DBusMainLoop: ensure all required timeouts are restarted (446b0d9ac75a) $ git describe --contains 892f084eeda0 529600397bca 446b0d9ac75a dbus-1.11.10~44 dbus-1.11.10~45 dbus-1.11.16~2 $ rmadison dbus  dbus | 1.10.6-1ubuntu3 | xenial | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-security | source, ...  dbus | 1.10.6-1ubuntu3.4 | xenial-updates | source, ... <--------  dbus | 1.12.2-1ubuntu1 | bionic | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-security | source, ...  dbus | 1.12.2-1ubuntu1.1 | bionic-updates | source, ... [Test Case] 1) Simulate a lot of concurrent SSH connections with e.g. a for loop: multipass@xenial-logind:~$ for i in {1..1000}; do sleep 0.1; ssh localhost sleep 1 & done 2) Check for leaked sessions in /run/systemd/system/: multipass@xenial-logind:~$ ls -ld /run/systemd/system/session-*.scope* drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-103.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-104.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-105.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-106.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-110.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-111.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-112.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-113.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-114.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-115.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-116.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-117.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-118.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-119.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-120.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-121.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-122.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-123.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-126.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-131.scope.d drwxr-xr-x 2 root root 160 Oct 4 15:34 /run/systemd/system/session-134.scope.d ... [Regression Potential] As the patches change the communication socket between dbus and systemd, possible regressions could cause systemd to not be notified of dbus events and vice-versa. We could see units not getting started properly, and communication between different services break down (e.g. between systemd-logind and other processes). In this case, the regression potential should be low as these patches have seen extensive testing both upstream and in more recent releases of Ubuntu. Nonetheless, these new packages will be rigorously tested through autopkgtest to avoid any possible Xenial-specific regressions.
2019-10-07 13:11:54 Dan Streetman systemd (Ubuntu Xenial): importance Undecided Medium
2019-10-07 13:11:57 Dan Streetman systemd (Ubuntu): importance Undecided Medium
2019-10-07 13:12:00 Dan Streetman dbus (Ubuntu): importance Undecided Medium
2019-10-07 13:12:02 Dan Streetman dbus (Ubuntu Xenial): importance Undecided Medium
2019-10-07 13:13:51 Dan Streetman tags sts sts-sponsor ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd xenial
2019-10-08 19:00:18 Mauricio Faria de Oliveira bug added subscriber Mauricio Faria de Oliveira
2019-10-17 23:45:56 Robie Basak bug added subscriber Robie Basak
2019-11-06 12:09:00 geoff mcleod bug added subscriber geoff mcleod
2019-11-25 17:18:45 Steve Langasek systemd (Ubuntu Xenial): status In Progress Incomplete
2019-11-25 17:32:55 Brian Murray bug added subscriber Balint Reczey
2019-11-25 17:33:00 Brian Murray bug added subscriber Brian Murray
2019-11-26 19:15:05 Dan Streetman systemd (Ubuntu Xenial): status Incomplete In Progress
2019-11-26 22:20:01 Brian Murray systemd (Ubuntu Xenial): status In Progress Fix Committed
2019-11-26 22:20:04 Brian Murray bug added subscriber Ubuntu Stable Release Updates Team
2019-11-26 22:20:07 Brian Murray bug added subscriber SRU Verification
2019-11-26 22:20:15 Brian Murray tags ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd xenial ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd verification-needed verification-needed-xenial xenial
2019-11-29 12:33:00 Timo Aaltonen dbus (Ubuntu Xenial): status In Progress Fix Committed
2019-12-03 20:36:11 Mauricio Faria de Oliveira tags ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd verification-needed verification-needed-xenial xenial ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd verification-done-xenial verification-needed xenial
2019-12-03 20:36:49 Mauricio Faria de Oliveira tags ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd verification-done-xenial verification-needed xenial ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd verification-done verification-done-xenial xenial
2019-12-05 13:01:18 Łukasz Zemczak removed subscriber Ubuntu Stable Release Updates Team
2019-12-05 13:01:17 Launchpad Janitor systemd (Ubuntu Xenial): status Fix Committed Fix Released
2019-12-05 16:28:58 Eric Desrochers bug added subscriber Eric Desrochers
2019-12-05 16:29:01 Eric Desrochers removed subscriber STS Sponsors
2019-12-05 16:29:11 Eric Desrochers bug added subscriber Dan Streetman
2019-12-05 16:32:21 Dan Streetman tags ddstreet sts sts-sponsor sts-sponsor-ddstreet systemd verification-done verification-done-xenial xenial sts sts-sponsor systemd verification-done verification-done-xenial xenial
2019-12-09 08:36:08 Launchpad Janitor dbus (Ubuntu Xenial): status Fix Committed Fix Released