Created attachment 554993 [details]
/var/log/messages file

Description of problem:

I left my laptop (ThinkPad T420s with sandybridge chipset) without AC power, and it went into hibernation when the battery was low.  It did resume from hibernate, but there were lots of ext4 errors in the dmesg log, and gnome-shell appeared to be stuck.  I couldn't restart/poweroff from the shell interface, nor do any activite via gnome, so I switched to a virtual console and issued 'shutdown -h now'.  That just caused a reboot of the laptop and there were ext4 errors on the disk, init dropped me to a shell asking to run e2fsck on the partition.  It found a few errors and I just accepted the default of 'y' for all.  /lost+found is empty.

Things seem OK after reboot, but this is concerning.  Attaching the /var/log/messages file.