It is possible for CoordinatedBackingStore of directed composited image to not have tiles, because CoordinatedImageBacking does not create tiles when the image is invisible.
Created attachment 175932 [details] Patch
I feel sorry for many mistakes I made. I wish to correct all today.
FYI, this seems related as well: http://build.webkit.org/results/EFL%20Linux%2064-bit%20Debug%20WK2/r135679%20%286335%29/compositing/overflow/content-loses-scrollbars-crash-log.txt I hope this patch fixes it as well.
(In reply to comment #3) > FYI, this seems related as well: > http://build.webkit.org/results/EFL%20Linux%2064-bit%20Debug%20WK2/r135679%20%286335%29/compositing/overflow/content-loses-scrollbars-crash-log.txt > > I hope this patch fixes it as well. The crash is fixing in Bug 103171. I'm sorry. I hope you don't encounter the crash tomorrow.
Comment on attachment 175932 [details] Patch Clearing flags on attachment: 175932 Committed r135697: <http://trac.webkit.org/changeset/135697>
All reviewed patches have been landed. Closing bug.