[Bug 256352] website build: hugo hangs sometimes forever

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256352

            Bug ID: 256352
           Summary: website build: hugo hangs sometimes forever
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Documentation
          Assignee: doc@FreeBSD.org
          Reporter: wosch@FreeBSD.org

Our new website build system depends on hugo. Sometimes it hangs and does not
finish

/usr/local/bin/hugo --minify
Start building sites ?
[...]
Total in 247238 ms
--- generate-pgpkeys-txt ---
/usr/local/bin/ruby ./tools/global-pgpkeys-creator.rb


using truss(1) I see that a hugo user thread is waiting some nanoseconds for
something and then runs in a timeout

ERR#60 'Operation timed out'

and a kevent is called with a ~10 seconds timeout. This repeats and never ends.


_umtx_op(0x2e45a18,UMTX_OP_WAIT_UINT_PRIVATE,0x0,0x18,0x7fffdfffcdc8) ERR#60
'Operation timed out'
compat11.kevent(3,0x0,0,{ },64,{ 9.977036585 })  = 0 (0x0)
_umtx_op(0xc000088558,UMTX_OP_WAKE_PRIVATE,0x1,0x0,0x0) = 0 (0x0)
_umtx_op(0xc000088558,UMTX_OP_WAIT_UINT_PRIVATE,0x0,0x18,0x0) = 0 (0x0)
nanosleep({ 0.010000000 })                       = 0 (0x0)
compat11.kevent(3,0x0,0,{ },64,{ 9.976893055 })  = 0 (0x0)
_umtx_op(0x2e45a18,UMTX_OP_WAIT_UINT_PRIVATE,0x0,0x18,0x7fffdfffcdc8) ERR#60
'Operation timed out'
_umtx_op(0xc00051e558,UMTX_OP_WAKE_PRIVATE,0x1,0x0,0x0) = 0 (0x0)
_umtx_op(0xc00051e558,UMTX_OP_WAIT_UINT_PRIVATE,0x0,0x18,0x0) = 0 (0x0)

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