This MAY be related to this bug, I'm not sure how...  Symptomatically,
it would make sense.  Not sure of the causal link though...

https://github.com/systemd/systemd/issues/13432

On Fri, 2021-01-08 at 11:59 -0500, Michael H. Warfield wrote:
> Ed, et al...
> 
> [Excuse the top posting but this is just a prelim report]
> 
> Still too early to say for certain but...
> 
> Since taking your advice and eliminating that "resolve
> [!UNAVAIL=return]" stanza from nsswitch.conf, I have only had one
> failure in the afflicted systems and that was due to a hardware
> problem
> with a USB hub connection, and not at all related or
> relevant.  That's
> almost 5 days on systems that would run into this problem in a matter
> of hours to under 1 day, and we're now almost 5 days out.
> 
> My level of confidence is growing.  I think you hit the nail square
> on
> the head.  The nsswitch.com problem may have been the issue.  But the
> cause may yet still be elsewhere.  That file is owned by glibc.  I'll
> file a bugzilla report against that package for f33.  I've had many
> bugzilla reports under my belt.  This one, against glib, will be a
> first for me.  I'll give it another week.
> 
> Many thanks sir!
> 
> Regards,
> Mike
> 
> On Sun, 2021-01-03 at 12:06 +0800, Ed Greshko wrote:
> > On 03/01/2021 11:52, Michael H. Warfield wrote:
> > 
> > First thing.....  Try not starting a line with "--".  Some email
> > client interpret that as the start of the
> > signature block and screws up presentation and reply formatting.
> > 
> > 
> > > But no...  systemd-resolved is not running and is not
> > > enabled.  Not the problem.  Which makes it even more perplexing.
> > > 
> > > Not a symlink.  Didn't work even when it was and redirected to
> > > 127.0.0.253.  One of the first things I check and tried.  Also
> > > checked
> > > nsswitch.conf.  Some differences but not that I could spot and
> > > why
> > > the
> > > difference between "host" and "ping"?  And why the timeout???
> > > 
> > > nsswitch.conf  hosts:      files mdns4_minimal [NOTFOUND=return]
> > > resolve [!UNAVAIL=return] myhostname dns
> > 
> > I don't know if this will have any effect, but since you're not
> > running/using systemd-resolved then it may be
> > a good idea to remove "resolve" from nsswitch.conf.
> > 
> > An F32 system has....
> > 
> > hosts:      files mdns4_minimal [NOTFOUND=return] dns myhostnam
> > 
> > ---
> > The key to getting good answers is to ask good questions.
> > 
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-- 
Michael H. Warfield (AI4NB) | (o) +1 706 850-8773 |  m...@wittsend.com
   /\/\|=mhw=|\/\/          | (c) +1 678 463-0932 |  
http://www.wittsend.com/mhw/
ARIN whois: MHW9-ARIN       | An optimist believes we live in the best of all
PGP Key: 0xC0EB9675674627FF | possible worlds.  A pessimist is sure of it!

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