Public bug reported:
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: 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.
** Affects: cups (Ubuntu)
Importance: Undecided
Status: New
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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://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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1890572/+subscriptions
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