== 2026-10-11T23:17:59Z E3 identity CLK_TCK=100
start swproof-vm-3id.service result="done" err=<nil>
systemctl: MainPID=69188 InvocationID=eb8cf25c040d4767854552012329cb20
+ busctl --user call org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager GetUnitByPID u 69188
o "/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice"
+ busctl --user introspect ... | grep PIDFD
.GetUnitByPIDFD                            method   h                osay                                                                                                 -
---- ident via private
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=0
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
[t0] bus connected (private) unixfd=true
[t0] GetUnitByPIDFD: path=/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice unit=swproof-vm-3id.service invocation=eb8cf25c040d4767854552012329cb20
[t0] GetUnitByPID(69188): path=/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice Id=swproof-vm-3id.service InvocationID=eb8cf25c040d4767854552012329cb20 err=<nil>
[t0] GetUnit(swproof-vm-3id.service): Id=swproof-vm-3id.service InvocationID=eb8cf25c040d4767854552012329cb20 MainPID=69188
[t0] verdict Alive(same unit+invocation, pidfd-pinned)
---- ident via session
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=0
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
[t0] bus connected (session) unixfd=true
[t0] GetUnitByPIDFD: path=/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice unit=swproof-vm-3id.service invocation=eb8cf25c040d4767854552012329cb20
[t0] GetUnitByPID(69188): path=/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice Id=swproof-vm-3id.service InvocationID=eb8cf25c040d4767854552012329cb20 err=<nil>
[t0] GetUnit(swproof-vm-3id.service): Id=swproof-vm-3id.service InvocationID=eb8cf25c040d4767854552012329cb20 MainPID=69188
[t0] verdict Alive(same unit+invocation, pidfd-pinned)
learned ticks=278636
---- wrong ticks (simulated pid reuse)
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=278637
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
start ticks mismatch 278636 != 278637 -> verdict Lost(pid reused)
---- bus unreachable: nonexistent socket
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=278636
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
[t0] bus connect (private nope.sock): dial unix nope.sock: connect: no such file or directory after 32.64µs -> verdict Unknown(transport: dial unix nope.sock: connect: no such file or directory)
---- bus unreachable: stale socket file (no listener)
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=278636
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
[t0] bus connect (private stale.sock): dial unix stale.sock: connect: connection refused after 39.64µs -> verdict Unknown(transport: dial unix stale.sock: connect: connection refused)
---- bus hung: listener that never answers (2s ctx timeout)
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=278636
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
[t0] bus connect (private hang.sock): read unix @->hang.sock: use of closed network connection after 2.001160126s -> verdict Unknown(transport: read unix @->hang.sock: use of closed network connection)
---- hold pidfd, stop the unit during hold, recheck (stale pidfd)
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=278636
pidfd_open ok fd=4
stat starttime(field22)=278636 err=<nil>
[t0] bus connected (private) unixfd=true
[t0] GetUnitByPIDFD: path=/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice unit=swproof-vm-3id.service invocation=eb8cf25c040d4767854552012329cb20
[t0] GetUnitByPID(69188): path=/org/freedesktop/systemd1/unit/swproof_2dvm_2d3id_2eservice Id=swproof-vm-3id.service InvocationID=eb8cf25c040d4767854552012329cb20 err=<nil>
[t0] GetUnit(swproof-vm-3id.service): Id=swproof-vm-3id.service InvocationID=eb8cf25c040d4767854552012329cb20 MainPID=69188
[t0] verdict Alive(same unit+invocation, pidfd-pinned)
holding pidfd 2s ...
poll(pidfd) readable=true (readable == process exited)
pidfd_send_signal(0) on held fd: no such process
/proc/69188/stat now: ticks=0 err=open /proc/69188/stat: no such file or directory
[t1] bus connected (private) unixfd=true
[t1] GetUnitByPIDFD: Failed to get PID from PIDFD: No such process -> Unknown(dbus org.freedesktop.DBus.Error.UnixProcessIdUnknown)
[t1] GetUnitByPID(69188): PID 69188 does not belong to any loaded unit. -> Lost(org.freedesktop.systemd1.NoUnitForPID)
[t1] GetUnit(swproof-vm-3id.service): Unit swproof-vm-3id.service not loaded. -> Lost(org.freedesktop.systemd1.NoSuchUnit)
---- after stop, fresh check of old pid
ident pid=69188 expect unit=swproof-vm-3id.service inv=eb8cf25c040d4767854552012329cb20 ticks=278636
pidfd_open: no such process -> verdict Lost(process gone)