Package: libsystemd0 Version: 241-7~deb10u2 Severity: normal When an sd-event io event source with fd ownership is released while it is dispatching (i.e. from inside the event callback), the event source is freed after dispatching is complete but it fails to close the fd.
This bug has recently been fixed upstream: f59825595182 sd-event: don't invalidate source type on disconnect