5.8-rc1 and later breaks chrome browser

[Steve French]

I noticed that chrome crashes immediately on startup  on my desktop
booting to 5.8-rc2 or later kernels (whether I build the kernel or
using the prebuilt weekly Ubuntu mainline kernel downloads).  Works
fine with default kernels or 5.7 or 5.7.7 stable kernel etc. - just
breaks if I boot 5.8-rc2 or later.  I even tried building with today's
mainline kernel and same thing.  Any ideas how to work around this.

Message logged to dmesg is:

[  131.366543] ThreadPoolServi[2526]: segfault at 415048 ip
00005652def3370d sp 00007fcdc3b37df0 error 6 in
chrome[5652daa7e000+785b000]
[  131.366546] Code: Bad RIP value.

-- 
Thanks,

Steve