When the job hangs, I see:

ls -l /dev/usb/lp*
ls: cannot access /dev/usb/lp*: No such file or directory

ps auxwww | grep usb
lp        2243  0.8  1.1  37020  2804 ?        Sl   14:30   0:01 
Samsung_SCX-4200_Series 32966 anonymous Test Page 1 
job-uuid=urn:uuid:d674bfa7-ab5d-3105-4062-fe488128f865 nousb-unidir 
job-originating-host-name=localhost time-at-creation=1339759834 
time-at-processing=1339759834
root      2244  0.0  0.5  23708  1396 ?        Sl   14:30   0:00 
usb://Samsung/SCX-4200%20Series?serial=8T66BADQ207127T.&interface=1 32966 
anonymous Test Page 1 job-uuid=urn:uuid:d674bfa7-ab5d-3105-4062-fe488128f865 
nousb-unidir job-originating-host-name=localhost time-at-creation=1339759834 
time-at-processing=1339759834
it        3526  0.0  0.3   5596   800 pts/1    S+   14:33   0:00 grep 
--color=auto usb

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https://bugs.launchpad.net/bugs/997040

Title:
  usb printer backend crashes

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