Comment 30 for bug 1292400

Same for me since I've updated to 17.04:

Apr 21 10:21:08 ubuntu kernel: [ 364.573719] INFO: task systemd-udevd:522 blocked for more than 120 seconds.
Apr 21 10:21:08 ubuntu kernel: [ 364.573733] systemd-udevd D 0 522 376 0x00000104
Apr 21 10:23:08 ubuntu kernel: [ 485.405508] INFO: task systemd-udevd:522 blocked for more than 120 seconds.
Apr 21 10:23:08 ubuntu kernel: [ 485.405515] systemd-udevd D 0 522 376 0x00000104
Apr 21 10:25:09 ubuntu kernel: [ 606.238271] INFO: task systemd-udevd:522 blocked for more than 120 seconds.
Apr 21 10:25:09 ubuntu kernel: [ 606.238279] systemd-udevd D 0 522 376 0x00000104
Apr 21 10:27:10 ubuntu kernel: [ 727.070201] INFO: task systemd-udevd:522 blocked for more than 120 seconds.
Apr 21 10:27:10 ubuntu kernel: [ 727.070208] systemd-udevd D 0 522 376 0x00000104
Apr 21 10:29:11 ubuntu kernel: [ 847.901930] INFO: task systemd-udevd:522 blocked for more than 120 seconds.
Apr 21 10:29:11 ubuntu kernel: [ 847.901938] systemd-udevd D 0 522 376 0x00000104
Apr 21 10:33:52 ubuntu systemd-udevd[520]: Process '/bin/sh -c 'echo 180 >/sys$DEVPATH/device/timeout'' failed with exit code 2.
Apr 21 10:33:52 ubuntu kernel: [ 2.941355] random: systemd-udevd: uninitialized urandom read (16 bytes read)
Apr 21 10:33:52 ubuntu kernel: [ 2.941412] random: systemd-udevd: uninitialized urandom read (16 bytes read)
Apr 21 10:33:52 ubuntu kernel: [ 2.941418] random: systemd-udevd: uninitialized urandom read (16 bytes read)
Apr 21 10:33:53 ubuntu systemd-udevd[520]: Process '/bin/sh -c 'echo 180 >/sys$DEVPATH/device/timeout'' failed with exit code 2.
Apr 21 10:33:54 ubuntu systemd-udevd[520]: Process '/usr/sbin/alsactl -E HOME=/run/alsa restore 0' failed with exit code 2.