Comment 14 for bug 1789131

Thanks for testing, Sarah. I'll submit an SRU request to have this commit included in Trusty.

This regression was introduced by the following mainline commit:
7dac4a1726a9 ("ext4: add validity checks for bitmap block numbers")

This commit was added to mainline in version v4.17-rc1. However, the regression it introduced was not fixed until v4.17-rc3. The regression was fixed by commit 22be37acce25.

Commit 7dac4a1726a9 was added to Trusty in the 3.13.0-157 kernel, but commit 22be37acce25 has not made it's way to Trusty via upstream stable updates as of yet. The SRU request I send will get the fix into Trusty without having to wait for the updates from upstream stable.