lsof hangs with latest 13.0-CURRENT snapshot

[Rodney W. Grimes]

> On Tue, 2019-04-09 at 12:20 -0700, Rodney W. Grimes wrote:
> > > After upgrading from FreeBSD-13.0-CURRENT-amd64-20190328-r345620 to
> > > FreeBSD-13.0-CURRENT-amd64-20190404-r345863, lsof (4.92 from
> > > packages)
> > > hangs.
> > > 
> > > This is true for bare metal installs and virtual machine installs.
> > > 
> > > How to recreate:
> > > 	
> > > 	Install FreeBSD-13.0-CURRENT-amd64-20190404-r345863 snapshot.
> > > 
> > > 	as root: lsof /sbin/init
> > > 
> > > By running command with -b option, this error is displayed:
> > > 
> > > lsof: status error on /sbin/init: Resource temporarily unavailable
> > > 
> > > The return code is 1.
> > > 
> > > This probably requires adjustment to lsof, but only the FreeBSD
> > > snapshot changed, so I'll start here.
> > 
> > Where did you get your lsof binary from?
> > 
> > lsof has internal knowledge of kernel data structures 
> > and must be compiled to match the running system.
> > 
> > 
> > > Thanks.
> > > David Boyd.
> 
> 
> lsof was installed via pkg install from pkg.freebsd.org.

That does not work well on ^head or for that mater any snapshot,
as I said, lsof has internal knowledge of kernel data structures
and must match the running kernel for it to work.

It should be complaining about a version mismatch, but perhaps
it was compiled recently enough that these are matching, but
there is still a datastruct that changed.

-- 
Rod Grimes                                                 rgrimes at freebsd.org