I found a setup that triggers it again (often but not always happening).

Once reproducible I took backtraces of the sys open to see what in ntp
does that.

Both opens are from the same place.
Thread 1 "ntpd" hit Catchpoint 1 (returned from syscall open), 
0x00007f8afd8fcd53 in __opendir (name=0x7ffc9999df90 "/usr/local/sbin")
    at ../sysdeps/posix/opendir.c:191
191     in ../sysdeps/posix/opendir.c
(gdb) bt
#0  0x00007f8afd8fcd53 in __opendir (name=0x7ffc9999df90 "/usr/local/sbin") at 
../sysdeps/posix/opendir.c:191
#1  0x00007f8afe5c6ba7 in ?? () from /usr/lib/x86_64-linux-gnu/libopts.so.25
#2  0x00007f8afe5cdde6 in ?? () from /usr/lib/x86_64-linux-gnu/libopts.so.25
#3  0x00007f8afe5cfa4f in optionProcess () from 
/usr/lib/x86_64-linux-gnu/libopts.so.25
#4  0x000055c12781ae7f in parse_cmdline_opts (pargc=0x7ffc9999f0dc, 
pargv=0x7ffc9999f0d0) at ntpd.c:359
#5  0x000055c12781af8d in ntpdmain (argc=<optimized out>, argv=<optimized out>) 
at ntpd.c:575
#6  0x00007f8afd84a1c1 in __libc_start_main (main=0x55c12780b0e0 <main>, 
argc=8, argv=0x7ffc9999f6b8, init=<optimized out>, 
    fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc9999f6a8) 
at ../csu/libc-start.c:308
#7  0x000055c12780b11a in _start ()

-- 
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Touch seeded packages, which is subscribed to ntp in Ubuntu.
https://bugs.launchpad.net/bugs/1741227

Title:
  apparmor denial to several paths to binaries

Status in ntp package in Ubuntu:
  New

Bug description:
  Issue shows up (non fatal) as:
   apparmor="DENIED" operation="open" profile="/usr/sbin/ntpd" 
name="/usr/local/sbin/" pid=23933 comm="ntpd" requested_mask="r" 
denied_mask="r" fsuid=0 ouid=0
   apparmor="DENIED" operation="open" profile="/usr/sbin/ntpd" 
name="/usr/local/bin/" pid=23933 comm="ntpd" requested_mask="r" denied_mask="r" 
fsuid=0 ouid=0

  Since non crit this is mostyl about many of us being curious why it
  actually does do it :-)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1741227/+subscriptions

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