nlabels == name->labels

[mike tancsa]

Hi,

    We recently upgraded to 9.16.2 on FreeBSD 11.3 STABLE and after ~
week of use, it died this morning with the following assertion.  Any
ideas what this might be about ?

May  3 05:36:27 ns named[845]: name.c:1738: INSIST(nlabels ==
name->labels) failed, back trace    
May  3 05:36:27 ns named[845]: #0 0x43c470 in ??    
May  3 05:36:27 ns named[845]: #1 0x61a3ca in ??    
May  3 05:36:27 ns named[845]: #2 0x4f96f1 in ??    
May  3 05:36:27 ns named[845]: #3 0x4fc277 in ??    
May  3 05:36:27 ns named[845]: #4 0x50e26b in ??    
May  3 05:36:27 ns named[845]: #5 0x518846 in ??    
May  3 05:36:27 ns named[845]: #6 0x516359 in ??    
May  3 05:36:27 ns named[845]: #7 0x56fea1 in ??    
May  3 05:36:27 ns named[845]: #8 0x63f39c in ??    
May  3 05:36:27 ns named[845]: #9 0x801e810b6 in ??    
May  3 05:36:27 ns named[845]: exiting (due to assertion failure)