Still got this today on dist-upgrading a 16.04 Server. Not very neat and caused some concern for bootability until reading here and the Debian bug made me realize that it is caused by the way triggers invocate lvm tools:
Setting up mdadm (3.3-2ubuntu7.4) ...
update-initramfs: deferring update (trigger activated)
Generating grub configuration file ...
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2303: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2303: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2316: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2316: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2329: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2329: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2342: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2342: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2402: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2402: /usr/sbin/grub-probe
Found linux image: /boot/vmlinuz-4.4.0-98-generic
Found linux image: /boot/vmlinuz-4.4.0-97-generic
Found initrd image: /boot/initrd.img-4.4.0-97-generic
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Found linux image: /boot/vmlinuz-4.4.0-87-generic
Found initrd image: /boot/initrd.img-4.4.0-87-generic
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 3125: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 3125: /usr/sbin/grub-probe
File descriptor 3 (pipe:[379519083]) leaked on lvs invocation. Parent PID 3241: /bin/sh
done
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Still got this today on dist-upgrading a 16.04 Server. Not very neat and caused some concern for bootability until reading here and the Debian bug made me realize that it is caused by the way triggers invocate lvm tools:
Setting up mdadm (3.3-2ubuntu7.4) ... grub-probe grub-probe grub-probe grub-probe grub-probe grub-probe grub-probe grub-probe grub-probe grub-probe 4.4.0-98- generic 4.4.0-97- generic img-4.4. 0-97-generic 4.4.0-96- generic img-4.4. 0-96-generic 4.4.0-93- generic img-4.4. 0-93-generic 4.4.0-87- generic img-4.4. 0-87-generic grub-probe grub-probe
update-initramfs: deferring update (trigger activated)
Generating grub configuration file ...
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2303: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2303: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2316: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2316: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2329: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2329: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2342: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2342: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2402: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 2402: /usr/sbin/
Found linux image: /boot/vmlinuz-
Found linux image: /boot/vmlinuz-
Found initrd image: /boot/initrd.
Found linux image: /boot/vmlinuz-
Found initrd image: /boot/initrd.
Found linux image: /boot/vmlinuz-
Found initrd image: /boot/initrd.
Found linux image: /boot/vmlinuz-
Found initrd image: /boot/initrd.
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 3125: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on vgs invocation. Parent PID 3125: /usr/sbin/
File descriptor 3 (pipe:[379519083]) leaked on lvs invocation. Parent PID 3241: /bin/sh
done
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults