Bug#791766: /usr/lib/cups/backend-available/usb: USB backend eats 100% CPU

[Fabian Greffrath <fabian@debian.org>]

Package: cups
Version: 2.0.3-6
Severity: important
File: /usr/lib/cups/backend-available/usb

Hi there,

sometimes it happens that I print a file to a USB-attached printer
and instead of printing, the usb process eats up 100% cpu. Nothing
else happens, apart from some GNOME window popping up and asking if my
printer is actually connected. In fact, it is.

This is what strace says the offending process does all the time:

ioctl(15, USBDEVFS_CLAIMINTERFACE, 0x7fffad353bfc) = -1 EBUSY (Device
or resource busy)

This repeasts endlessly.

Please tell me how I can provide further information.

Cheers,

Fabian


-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'experimental'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages cups depends on:
ii  cups-client            2.0.3-6
ii  cups-common            2.0.3-6
ii  cups-core-drivers      2.0.3-6
ii  cups-daemon            2.0.3-6
ii  cups-filters           1.0.69-1
ii  cups-ppdc              1.7.5-12
ii  cups-server-common     2.0.3-6
ii  debconf [debconf-2.0]  1.5.56
ii  ghostscript            9.06~dfsg-2
ii  libavahi-client3       0.6.31-5
ii  libavahi-common3       0.6.31-5
ii  libc-bin               2.19-18
ii  libc6                  2.19-18
ii  libcups2               2.0.3-6
ii  libcupscgi1            2.0.3-6
ii  libcupsimage2          2.0.3-6
ii  libcupsmime1           2.0.3-6
ii  libcupsppdc1           2.0.3-6
ii  libgcc1                1:5.1.1-12
ii  libstdc++6             5.1.1-12
ii  libusb-1.0-0           2:1.0.19-1
ii  lsb-base               4.1+Debian13+nmu1
ii  poppler-utils          0.26.5-2
ii  procps                 2:3.3.10-2

Versions of packages cups recommends:
ii  avahi-daemon                     0.6.31-5
ii  colord                           1.2.1-1+b2
ii  cups-filters [ghostscript-cups]  1.0.69-1
ii  printer-driver-gutenprint        5.2.10-3

Versions of packages cups suggests:
pn  cups-bsd                                   <none>
pn  cups-pdf                                   <none>
ii  foomatic-db-compressed-ppds [foomatic-db]  20150411-1
ii  hplip                                      3.14.6-1+b2
ii  printer-driver-hpcups                      3.14.6-1+b2
ii  smbclient                                  2:4.1.17+dfsg-4
ii  udev                                       221-1

-- debconf information:
  cupsys/raw-print: true
  cupsys/backend: lpd, socket, usb, snmp, dnssd