[cups.general] /usr/libexec/cups/backend/usb failed

[Grant]

> Yes, you should have no problems sending jobs from 1.5.2 to 1.6.1.  Just keep in mind that if you are using CUPS browsing for printer sharing on the 1.5.2 machine, it is no longer supported in 1.6.x...

I gave it a try and I'm told there is a long printing delay now.
Apparently it's up to 4-5 minutes for a 4-page PDF.  I've upgraded the
client to 1.6.1 and I'll know if that helped soon.

I get these from the server error_log on cupsd restart now:

CreateProfile failed: org.freedesktop.DBus.Error.ServiceUnknown:The
name org.freedesktop.ColorManager was not provided by any .service
files
CreateDevice failed: org.freedesktop.DBus.Error.ServiceUnknown:The
name org.freedesktop.ColorManager was not provided by any .service
files

and this in the same log with each print, although Google says this
was due to the mismatch in server/client cups versions and not a
problem:

Unexpected 'document-format' operation attribute in a Create-Job request.

Do you know what might be causing the delay and if upgrading the
client to 1.6.1 should fix it?

- Grant


>>> This sounds like a bug in the USB backend.  I don't know how you would enable core dumps on Gentoo, but that's what you need (plus gdb) to provide the info needed to diagnose this issue.
>>>
>>> You could also try the current USB backend from CUPS 1.6.x which is significantly improved from 1.5.x...
>>
>> Thank you, I'll try 1.6.1.  Should I be OK with a machine on 1.5.2
>> sending pages to the 1.6.1 machine via lpr?
>>
>> - Grant
>>
>>
>>>>>> What version of CUPS?
>>>>>>
>>>>>> What operating system/Linux distribution?
>>>>>
>>>>> I'm using cups-1.5.2-r4 on Gentoo Linux.  A script prints to the
>>>>> printer with lpr from a remote server.  The same script prints to
>>>>> another LP2844 and a Brother laser printer without issue.
>>>>>
>>>>> I should have mentioned that I can get it working again by "resuming"
>>>>> the printer in the web admin.
>>>>>
>>>>> - Grant
>>>>
>>>> Can anyone point me in the right direction with this?
>>>>
>>>> - Grant
>>>>
>>>>
>>>>>>> Every so often, my Zebra LP2844 printer stops working and the status
>>>>>>> in the web admin is:
>>>>>>>
>>>>>>> Paused - "/usr/libexec/cups/backend/usb failed"
>>>>>>>
>>>>>>> error_log says only the following:
>>>>>>>
>>>>>>> PID 13903 (/usr/libexec/cups/backend/usb) crashed on signal 11.
>>>>>>> [Job 70345] Stopping unresponsive job!
>>>>>>>
>>>>>>> Does anyone know how to prevent this from happening?
>>>>>>>
>>>>>>> - Grant