YDL4.0 instabilty compared to YDL3.0

[Nigel Horne]

>From time to time I see this error with YDL4. YDL3 didn't have
this problem:

vecter: 300 at pc = c004a2ac,lr=f2573014
msr=9032,sp=df317ee0 [df317e30]
dar=0,dsirs=40000000
current=ed9ef980,pid=2311,comm=nfsd
mon>

Hitting "x<cr>" sometimes allows it to recover.

-Nigel