This occurs for me on a system that had been upgraded from 17.04 to
17.10. I've now upgraded it to 18.04 pre-release and Disks's restore
function is working again. It does seem to use a lot of CPU, however,
but I haven't compare it with another system very scientifically.

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  Restore Disk Image stuck at 0% using 100% of CPU, then Disks crashed
  when I closed its window

Status in gnome-disk-utility package in Ubuntu:

Bug description:
  I was attempting to use "Restore Disk Image" to write an Ubuntu MATE
  iso to flash drive. The task stalled at 0%, and htop showed Disks
  using 100% CPU. I cancelled the task and clicked the window close
  button, and then Disks crashed.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.10
  Package: gnome-disk-utility 3.26.1-0ubuntu1
  ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
  Uname: Linux 4.13.0-12-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.7-0ubuntu2
  Architecture: amd64
  AssertionMessage: *** Error in `/usr/bin/gnome-disks': free(): invalid 
pointer: 0x000055b9230dfd0f ***
  CurrentDesktop: MATE
  Date: Thu Oct  5 18:34:19 2017
  ExecutablePath: /usr/bin/gnome-disks
  InstallationDate: Installed on 2016-11-22 (317 days ago)
  InstallationMedia: Ubuntu-MATE 16.10 "Yakkety Yak" - Release amd64 
  ProcCmdline: /usr/bin/gnome-disks
  Signal: 6
  SourcePackage: gnome-disk-utility
   __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7fe72f8b2408 
"*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:181
   malloc_printerr (action=<optimized out>, str=0x7fe72f8aed8e "free(): invalid 
pointer", ptr=<optimized out>, ar_ptr=<optimized out>) at malloc.c:5423
   _int_free (av=0x7fe72fae4c20 <main_arena>, p=<optimized out>, have_lock=0) 
at malloc.c:4172
   __GI___libc_free (mem=<optimized out>) at malloc.c:3142
   () at /usr/lib/x86_64-linux-gnu/
  Title: gnome-disks assert failure: *** Error in `/usr/bin/gnome-disks': 
free(): invalid pointer: 0x000055b9230dfd0f ***
  UpgradeStatus: Upgraded to artful on 2017-10-04 (1 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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