Fuzzing Messages

Richard Laager rlaager at wiktel.com
Sun Dec 1 08:26:54 UTC 2019

On 12/1/19 2:17 AM, Richard Laager via devel wrote:
> On 11/30/19 6:17 AM, ASSI via devel wrote:
>> ASSI via devel writes:
>>> is… intriguing.  If you follow the code through the function, ts_min in
>>> the log should always be ts_prev+sys_fuzz; these two values can't be
>>> identical or differ by any other value, ts_min must strictly be greater
>>> than ts_prev by sys_fuzz.  I notice that there is always a DNS operation
>>> logged at the same time when I get these errors, so I am pretty sure
>>> this is related to the DNS thread.
> That was the case for me _at startup_, but not after that. (See the
> attached logs.)
>>>  This would also explain why a server
>>> that has many clients would see many more such errors.
> Why's that? What DNS lookups is ntpd doing for clients?
>> While I have not yet identified the code path that is involved (likely
>> something in NTS, I think), you might want to try the following monkey
>> patch:

The issue persists when removing "nts" from "server" lines (i.e.
disabling NTS client behavior).

The problem goes away when disabling NTS server behavior.


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