I also built a test kernel up to commit 3840ed9 again.  This kernel
should fix the bug since it's the last commit added by by the merge
base:

commit e63a94f12b5fc67b2b92a89d4058e7a9021e900e
tree 9fddf35df3289bd41c2310937bf2faed4d036603
parent 1a3b85ea36d38d5732fdd86b321b10bcaeb53512
parent 3840ed9548f778717aaab5eab744da798c3ea055
author Linus Torvalds <torva...@linux-foundation.org> 1504632648 -0700
committer Linus Torvalds <torva...@linux-foundation.org> 1504632648 -0700
mergetag object 3840ed9548f778717aaab5eab744da798c3ea055
 type commit
 tag tty-4.14-rc1
 tagger Greg Kroah-Hartman <gre...@linuxfoundation.org> 1504542898 +0200
 
 TTY/Serial updates for 4.14-rc1


The merge has commit 1a3b85ea as the first parent and commit 3840ed9 as
the second parent, so all the commits added by the merge should be
between these two commits.


git describe --contains 1a3b85e
v4.14-rc1~150

git describe --contains 3840ed9
v4.14-rc1~149^2

And the merge:
git describe --contains e63a94f
v4.14-rc1~149


If a test kernel up to commit e63a94f fixes the bug, then a test kernel up to 
commit 3840ed9 should as well.  If it does not, then I'll have to dig much 
deeper.

Commit e63a94f is a child of commit 3840ed9:

commit 3840ed9548f778717aaab5eab744da798c3ea055
Author: Miodrag Dinic <miodrag.di...@imgtec.com>  2017-08-29 09:53:20
Committer: Greg Kroah-Hartman <gre...@linuxfoundation.org>  2017-08-31 12:58:45
Parent: 7157d2be23da9f8860c69e2b79184a4e02701dad (tty: goldfish: Use streaming 
DMA for r/w operations on Ranchu platforms)
Child:  e63a94f12b5fc67b2b92a89d4058e7a9021e900e (Merge tag 'tty-4.14-rc1' of 
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty)
Branches: master, remotes/next/akpm, remotes/next/akpm-base, 
remotes/next/master, remotes/next/stable, remotes/origin/master
Follows: v4.13-rc5
Precedes: v4.14-rc1

    tty: goldfish: Implement support for kernel 'earlycon' parameter



Test kernels can be found at:

3840ed9: http://kernel.ubuntu.com/~jsalisbury/lp1724911/3840ed9/
e63a94f: http://kernel.ubuntu.com/~jsalisbury/lp1724911/e63a94f/

7157d2b: http://kernel.ubuntu.com/~jsalisbury/lp1724911/7157d2b/

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  text VTs are unavailable on desktop after upgrade to Ubuntu 17.10

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