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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: no file system found for kernel 4.14.78
Date: Sat, 3 Nov 2018 18:46:42 +0200
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References: <c52ee675-0e6b-48bc-e280-45e899405d4e@iinet.net.au>
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On 03/11/2018 15:32, Bill Kenworthy wrote:
> Kernel 4.14.78 has been released and I have a fail upgrading one system
> - fails to mount root vfs but oops instead of dropping to a recovery shell:
> 
> Same boot stanza as 4.14.65, one unrelated (RCU) difference between .configs

Try manually specifying the root fs and the fs type in the kernel 
arguments. Here, I use:

   root=PARTUUID=the-partition-uuid-of-the-root-fs ro rootfstype=ext4

You can see the UUIDs of your partitions with:

   ls -l /dev/disk/by-partuuid

I always had to do that here, otherwise I just get the same boot error 
as you.