[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
Hi Till,
the issue was reported in the Apple repository:
https://github.com/apple/cups/issues/5817
I will check whether this was already fixed in OpenPrinting or not.
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https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
Fix Released
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
Looking at the version of cups in Impish it seems that this change has
made it into cups, subsequently I'm setting the bug to fix released.
** Changed in: cups (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
Fix Released
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
Please report on the new GitHub of CUPS on OpenPrinting:
https://github.com/OpenPrinting/cups/issues
On Apple the CUPS project is dead and bug reports probably not read any
more.
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https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
Hi Sebastian,
the patch set the job state to backend error.
I don't think openprinting is the right error here. The problem is in
the backend (the USB backend) when it's not possible to communicate with
a USB printer. This usually means that the printer is not connected.
--
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Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
What's the status of the patch upstream? The cups reports mentioned
earlier got close asking to report to openprinting instead, did you do
that?
--
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https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
** No longer affects: cups
--
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Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
** Changed in: cups
Status: New => Fix Released
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in CUPS:
Fix Released
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
** Changed in: cups
Status: Unknown => New
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in CUPS:
New
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
** Also affects: cups via
https://github.com/apple/cups/issues/5817
Importance: Unknown
Status: Unknown
** Changed in: cups (Ubuntu)
Importance: Undecided => Low
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in CUPS:
New
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
The attachment "usb-libusb.c.patch" seems to be a patch. If it isn't,
please remove the "patch" flag from the attachment, remove the "patch"
tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the
team.
[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issues please contact him.]
** Tags added: patch
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to cups in Ubuntu.
https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
We have prepared a patch for the package in Ubuntu 18.04 (CUPS 2.2.7).
We would like to request to include a solution like this for at least
Ubuntu 18.04.
We also made a pull request in the official CUPS repository:
https://github.com/apple/cups/issues/5817
https://github.com/apple/cups/pull/5818
However, we don't have plans to upgrade or change the distribution we
use (Ubuntu 18.04), and this issue is affecting us considerably.
** Bug watch added: github.com/apple/cups/issues #5817
https://github.com/apple/cups/issues/5817
** Patch added: "usb-libusb.c.patch"
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+attachment/5399506/+files/usb-libusb.c.patch
--
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https://bugs.launchpad.net/bugs/1890572
Title:
USB backend never ends if the printer is not connected
Status in cups package in Ubuntu:
New
Bug description:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take hours to complete.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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[Touch-packages] [Bug 1890572] Re: USB backend never ends if the printer is not connected
** Description changed:
- USB backend never ends if the printer is not connected. we have been
+ USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
- fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
- while ((g.printer = find_device(print_cb, uri)) == NULL)
- {
- _cupsLangPrintFilter(stderr, "INFO",
-_("Waiting for printer to become available."));
- sleep(5);
- }
+ fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
+ while ((g.printer = find_device(print_cb, uri)) == NULL)
+ {
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("Waiting for printer to become available."));
+ sleep(5);
+ }
```
It's also easy to test by invoking the backend by hand:
-
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Brother/PJ-773?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
- Setting a job timeout policy or stopping the job by hand are not options
- for us. We can have job that take up to an hour to complete.
+ Setting a work timeout policy or manually stopping work are not options
+ for us. We may have jobs that take up to an hour to complete.
** Description changed:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
- DEBUG: Printing on printer with URI: usb://Brother/PJ-773?serial=?
+ DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
Setting a work timeout policy or manually stopping work are not options
for us. We may have jobs that take up to an hour to complete.
** Description changed:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while ((g.printer = find_device(print_cb, uri)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO",
_("Waiting for printer to become available."));
sleep(5);
}
```
It's also easy to test by invoking the backend by hand:
```
# export DEVICE_URI='usb://Printer/Model?serial=?'
# /usr/lib/cups/backend/usb 0 root title 1 '' data.file
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 159 quirks.
DEBUG: Printing on printer with URI: usb://Printer/Model?serial=?
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
-
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
DEBUG: libusb_get_device_list=6
INFO: Waiting for printer to become available.
...
```
- Setting a work timeout policy or manually stopping work are not options
+ Setting a job timeout policy or manually stopping work are not options
for us. We may have jobs that take up to an hour to complete.
** Description changed:
USB backend never ends if the printer is not connected. We have been
able to identify a infinity loop in print_device function in usb-
libusb.c file:
```
fprintf(stderr, "DEBUG: Printing on printer with URI: %s\n", uri);
while
