[cups] broken pipe but job successfull

[Lorenzo Milesi]

I'm having a weird issue: the job is reported as printed but the document
is not. After enabling debug I found the connection is established, some
data is sent to the printer but during the transport the commands returns a
broken pipe error. Despite of this the job is reported as successfully
printed by CUPS, so it's lost.
Is it some configuration parameter or the driver itself not reporting the
job as not printed?
Thanks


printers.conf is configured as:

   + Info: KONICA MINOLTA C352/C300 PS(P)
   + MakeModel: KONICA MINOLTA C352/C300 PS(P)
   + DeviceURI: socket://192.168.11.185 <callto:192.168.11.185>

PPD file is in /etc/cups/ppd/OLIVETTI_d-Copia_3500MF.ppd (the printer is an
Olivetti, basically a rebranding of a Konica Minolta).


Log:
D [09/Aug/2020:19:53:18 +0200] [Job 33149] Connecting to 192.168.11.185
<callto:192.168.11.185>:9100
I [09/Aug/2020:19:53:18 +0200] [Job 33149] Connessione alla stampante in
corso.
D [09/Aug/2020:19:53:18 +0200] [Job 33149] Set job-printer-state-message to
"Connessione alla stampante in corso.", current level=INFO
D [09/Aug/2020:19:53:18 +0200] [Job 33149] STATE: -connecting-to-device
I [09/Aug/2020:19:53:18 +0200] [Job 33149] Connesso alla stampante.
D [09/Aug/2020:19:53:18 +0200] [Job 33149] Set job-printer-state-message to
"Connesso alla stampante.", current level=INFO
D [09/Aug/2020:19:53:18 +0200] [Job 33149] Connected to 192.168.11.185
<callto:192.168.11.185>:9100...
D [09/Aug/2020:19:53:18 +0200] [Job 33149] backendRunLoop(print_fd=0,
device_fd=7, snmp_fd=6, addr=0x55cdce2bf6d8, use_bc=1,
side_cb=0x55cdcd65e000)
D [09/Aug/2020:19:53:18 +0200] [Job 33149] Read 8192 bytes of print data...
D [09/Aug/2020:19:53:19 +0200] [Job 33149] ATTR:
marker-levels=81,82,83,16,93,99,93,99,95,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
D [09/Aug/2020:19:53:19 +0200] [Job 33149] new_supply_state=0,
change_state=a2
D [09/Aug/2020:19:53:19 +0200] [Job 33149] STATE: -developer-empty-warning
D [09/Aug/2020:19:53:19 +0200] [Job 33149] STATE: -opc-life-over-warning
D [09/Aug/2020:19:53:19 +0200] [Job 33149] STATE: -toner-empty-warning
D [09/Aug/2020:19:53:20 +0200] [Job 33149] new_state=100, change_state=0
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Wrote 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Read 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Wrote 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Read 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Wrote 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Read 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Wrote 8192 bytes of print data...
D [09/Aug/2020:19:53:20 +0200] [Job 33149] Read 1329 bytes of print data...
D [09/Aug/2020:19:53:26 +0200] [Job 33149] ATTR:
marker-levels=81,82,83,16,93,99,93,99,95,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
D [09/Aug/2020:19:53:26 +0200] [Job 33149] new_supply_state=0,
change_state=0
D [09/Aug/2020:19:55:20 +0200] [Job 33149] Error reading back-channel data:
Connection reset by peer
E [09/Aug/2020:19:55:20 +0200] [Job 33149] Non è possibile scrivere i dati
della stampa: Broken pipe
D [09/Aug/2020:19:55:20 +0200] [Job 33149] Set job-printer-state-message to
"Non è possibile scrivere i dati della stampa: Broken pipe", current
level=ERROR
D [09/Aug/2020:19:55:20 +0200] [Job 33149] STATE:
+cups-waiting-for-job-completed
I [09/Aug/2020:19:55:20 +0200] [Job 33149] In attesa che la stampante
finisca.
D [09/Aug/2020:19:55:20 +0200] [Job 33149] ATTR:
marker-levels=81,82,83,16,93,99,93,99,95,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
D [09/Aug/2020:19:55:20 +0200] [Job 33149] new_supply_state=0,
change_state=0
D [09/Aug/2020:19:55:20 +0200] [Job 33149] new_state=100, change_state=0
D [09/Aug/2020:19:55:20 +0200] [Job 33149] PID 31542
(/usr/lib/cups/backend/socket) exited with no errors.
D [09/Aug/2020:19:55:20 +0200] [Job 33149] time-at-completed=1596995720
<callto:1596995720>
I [09/Aug/2020:19:55:20 +0200] [Job 33149] Job completed.
D [09/Aug/2020:19:55:21 +0200] [Job 33149] Unloading...