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[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 -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
