** Description changed: + [Impact] + WSL 24.04 / systemd 255.4-1ubuntu8 * Upstream report: https://github.com/microsoft/WSL/issues/8879 * Upstream PR: https://github.com/systemd/systemd/pull/32534 * Upstream commit: https://github.com/systemd/systemd-stable/commit/8e57759d6d80ef772d8e17a4559a6797e09af93a.patch + In WSL, the cgroup.procs PID list for some reason contain a ton of zeros everywhere from unmapped PIDs. + Whenever cg_read_pid encounters such a zero, it throws an error. This makes systemd near unusable inside of WSL. + + [Test Plan] + + On WSL running Ubuntu 24.04, run systemctl status. On an affected + system, there will be an error saying "Failed to dump process list + [...]". On a patched system, the command should work as expected. + + [Where problems could occur] + + This patch adds a flags parameter to cg_read_pid(), and adds a new flag, + CGROUP_DONT_SKIP_UNMAPPED. The new default behavior of cg_read_pid() is + that unmapped pids *will* be skipped. When this flag is set in a call to + cg_read_pid(), encountering an unmapped pid will leave the caller to + deal with it. + + There are several places where cg_read_pid() is called in systemd, so + there are several places where this would come up. If we did see + problems, it would likely because a caller is skipping the unmapped pids + when it should not be. For callers that do not skip (i.e. pass + CGROUP_DONT_SKIP_UNMAPPED), they either handle it cleanly, or propagate + a different error to signal this case. + + [Original Description] + + WSL 24.04 / systemd 255.4-1ubuntu8 + + * Upstream report: https://github.com/microsoft/WSL/issues/8879 + * Upstream PR: https://github.com/systemd/systemd/pull/32534 + * Upstream commit: https://github.com/systemd/systemd-stable/commit/8e57759d6d80ef772d8e17a4559a6797e09af93a.patch In WSL, the cgroup.procs PID list for some reason contain a ton of zeros everywhere from unmapped PIDs. Whenever cg_read_pid encounters such a zero, it throws an error. This makes systemd near unusable inside of WSL. - # Test Case install Ubuntu WSL 24.04 from the MS STore. This version has systemd already enabled. ## Expected Behavior systemctl status command to work ## Actual Behavior toor@XPS:~$ systemctl status Failed to dump process list for 'XPS', ignoring: Input/output error ● XPS - State: degraded - Units: 318 loaded (incl. loaded aliases) - Jobs: 0 queued - Failed: 1 units - Since: Sat 2022-09-24 08:43:15 PDT; 14min ago - systemd: 251.4-1ubuntu6 - Tainted: cgroupsv1 - CGroup: / + State: degraded + Units: 318 loaded (incl. loaded aliases) + Jobs: 0 queued + Failed: 1 units + Since: Sat 2022-09-24 08:43:15 PDT; 14min ago + systemd: 251.4-1ubuntu6 + Tainted: cgroupsv1 + CGroup: /
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2067922 Title: on WSL systemd status fails output To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/2067922/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
