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From: Wolfgang Bumiller <w.bumiller@proxmox.com>
To: Maximiliano Sandoval <m.sandoval@proxmox.com>
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Subject: Re: [pve-devel] [PATCH] systemd: disconnect signals
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On Mon, Mar 03, 2025 at 03:42:53PM +0100, Maximiliano Sandoval wrote:
> Dbus has a limit of 512 connections by default and signals should be
> disconnected as soon as they are not needed anymore.
>
> This should alleviate https://bugzilla.proxmox.com/show_bug.cgi?id=5876.
>
> Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
> ---
> src/PVE/Systemd.pm | 34 ++++++++++++++++++++++++++++------
> 1 file changed, 28 insertions(+), 6 deletions(-)
>
> diff --git a/src/PVE/Systemd.pm b/src/PVE/Systemd.pm
> index 07c912e3..1d7772d9 100644
> --- a/src/PVE/Systemd.pm
> +++ b/src/PVE/Systemd.pm
> @@ -44,6 +44,7 @@ sub unescape_unit {
> # main loop is being used as we need to wait signals.
> sub systemd_call($;$) {
> my ($code, $timeout) = @_;
> + my $signal_info;
>
> my $bus = Net::DBus->system();
> my $reactor = Net::DBus::Reactor->main();
> @@ -64,13 +65,22 @@ sub systemd_call($;$) {
> $timer = undef;
> }
>
> + if (defined($signal_info)) {
> + if (my $signal_name = $signal_info->{name}) {
> + if (my $signal_handle = $signal_info->{handle}) {
I think it's enough to require the info to either be valid or undef,
therefore the first `if` should suffice.
> + $if->disconnect_from_signal($signal_name, $signal_handle);
> + }
> + }
> + $signal_info = undef;
> + }
> +
> if (defined($reactor)) {
> $reactor->shutdown();
> $reactor = undef;
> }
> };
>
> - my $result = $code->($if, $reactor, $finish_callback);
> + (my $result, $signal_info) = $code->($if, $reactor, $finish_callback);
> # Are we done immediately?
> return $result if defined $result;
>
> @@ -124,7 +134,8 @@ sub enter_systemd_scope {
>
> my $job;
>
> - $if->connect_to_signal('JobRemoved', sub {
> + my $signal_name = 'JobRemoved';
> + my $signal_handle = $if->connect_to_signal($signal_name, sub {
> my ($id, $removed_job, $signaled_unit, $result) = @_;
> return if $signaled_unit ne $unit || $removed_job ne $job;
> if ($result ne 'done') {
> @@ -139,7 +150,12 @@ sub enter_systemd_scope {
>
> $job = $if->StartTransientUnit($unit, 'fail', $properties, []);
>
> - return undef;
> + my $signal_info = {
> + name => $signal_name,
> + handle => $signal_handle,
> + };
> +
> + return (undef, $signal_info);
> }, $timeout);
> }
>
> @@ -152,18 +168,24 @@ sub wait_for_unit_removed($;$) {
> my $unit_obj = eval { $if->GetUnit($unit) };
> return 1 if !$unit_obj;
>
> - $if->connect_to_signal('UnitRemoved', sub {
> + my $signal_name = 'UnitRemoved';
> + my $signal_handle = $if->connect_to_signal($signal_name, sub {
> my ($id, $removed_unit) = @_;
> $finish_cb->(1) if $removed_unit eq $unit_obj;
> });
>
> + my $signal_info = {
> + name => $signal_name,
> + handle => $signal_handle,
> + };
> +
> # Deal with what we lost between GetUnit() and connecting to UnitRemoved:
> my $unit_obj_new = eval { $if->GetUnit($unit) };
> if (!$unit_obj_new) {
> - return 1;
> + return (1, $signal_info);
> }
>
> - return undef;
> + return (undef, $signal_info);
> }, $timeout);
> }
>
> --
> 2.39.5
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